summaryrefslogtreecommitdiffstats
path: root/src/H5CX.c
blob: b2ddbc166295b11c93b23b7ff4c124ca44b13cfb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Purpose:
 *      Keep a set of "psuedo-global" information for an API call.  This
 *      general corresponds to the DXPL for the call, along with cached
 *      information from them.
 */

/****************/
/* Module Setup */
/****************/

#include "H5CXmodule.h" /* This source code file is part of the H5CX module */

/***********/
/* Headers */
/***********/
#include "H5private.h"   /* Generic Functions                    */
#include "H5CXprivate.h" /* API Contexts                         */
#include "H5Dprivate.h"  /* Datasets                             */
#include "H5Eprivate.h"  /* Error handling                       */
#include "H5FLprivate.h" /* Free Lists                           */
#include "H5Iprivate.h"  /* IDs                                  */
#include "H5Lprivate.h"  /* Links                                */
#include "H5MMprivate.h" /* Memory management                    */
#include "H5Pprivate.h"  /* Property lists                       */

/****************/
/* Local Macros */
/****************/

#ifdef H5_HAVE_THREADSAFE
/*
 * The per-thread API context. pthread_once() initializes a special
 * key that will be used by all threads to create a stack specific to
 * each thread individually. The association of contexts to threads will
 * be handled by the pthread library.
 *
 * In order for this macro to work, H5CX_get_my_context() must be preceded
 * by "H5CX_node_t *ctx =".
 */
#define H5CX_get_my_context() H5CX__get_context()
#else /* H5_HAVE_THREADSAFE */
/*
 * The current API context.
 */
#define H5CX_get_my_context() (&H5CX_head_g)
#endif /* H5_HAVE_THREADSAFE */

/* Common macro for the retrieving the pointer to a property list */
#define H5CX_RETRIEVE_PLIST(PL, FAILVAL)                                                                     \
    /* Check if the property list is already available */                                                    \
    if (NULL == (*head)->ctx.PL)                                                                             \
        /* Get the property list pointer */                                                                  \
        if (NULL == ((*head)->ctx.PL = (H5P_genplist_t *)H5I_object((*head)->ctx.H5_GLUE(PL, _id))))         \
            HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, (FAILVAL), "can't get property list")

/* Common macro for the duplicated code to retrieve properties from a property list */
#define H5CX_RETRIEVE_PROP_COMMON(PL, DEF_PL, PROP_NAME, PROP_FIELD)                                         \
    /* Check for default property list */                                                                    \
    if ((*head)->ctx.H5_GLUE(PL, _id) == (DEF_PL))                                                           \
        H5MM_memcpy(&(*head)->ctx.PROP_FIELD, &H5_GLUE3(H5CX_def_, PL, _cache).PROP_FIELD,                   \
                    sizeof(H5_GLUE3(H5CX_def_, PL, _cache).PROP_FIELD));                                     \
    else {                                                                                                   \
        /* Retrieve the property list */                                                                     \
        H5CX_RETRIEVE_PLIST(PL, FAIL)                                                                        \
                                                                                                             \
        /* Get the property */                                                                               \
        if (H5P_get((*head)->ctx.PL, (PROP_NAME), &(*head)->ctx.PROP_FIELD) < 0)                             \
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "can't retrieve value from API context")             \
    } /* end else */                                                                                         \
                                                                                                             \
    /* Mark the field as valid */                                                                            \
    (*head)->ctx.H5_GLUE(PROP_FIELD, _valid) = TRUE;

/* Macro for the duplicated code to retrieve properties from a property list */
#define H5CX_RETRIEVE_PROP_VALID(PL, DEF_PL, PROP_NAME, PROP_FIELD)                                          \
    /* Check if the value has been retrieved already */                                                      \
    if (!(*head)->ctx.H5_GLUE(PROP_FIELD, _valid)) {                                                         \
        H5CX_RETRIEVE_PROP_COMMON(PL, DEF_PL, PROP_NAME, PROP_FIELD)                                         \
    } /* end if */

/* Macro for the duplicated code to retrieve possibly set properties from a property list */
#define H5CX_RETRIEVE_PROP_VALID_SET(PL, DEF_PL, PROP_NAME, PROP_FIELD)                                      \
    /* Check if the value has been retrieved already */                                                      \
    if (!((*head)->ctx.H5_GLUE(PROP_FIELD, _valid) || (*head)->ctx.H5_GLUE(PROP_FIELD, _set))) {             \
        H5CX_RETRIEVE_PROP_COMMON(PL, DEF_PL, PROP_NAME, PROP_FIELD)                                         \
    } /* end if */

#if defined(H5_HAVE_PARALLEL) && defined(H5_HAVE_INSTRUMENTED_LIBRARY)
/* Macro for the duplicated code to test and set properties for a property list */
#define H5CX_TEST_SET_PROP(PROP_NAME, PROP_FIELD)                                                            \
    {                                                                                                        \
        htri_t check_prop = 0; /* Whether the property exists in the API context's DXPL */                   \
                                                                                                             \
        /* Check if property exists in DXPL */                                                               \
        if (!(*head)->ctx.H5_GLUE(PROP_FIELD, _set)) {                                                       \
            /* Retrieve the dataset transfer property list */                                                \
            H5CX_RETRIEVE_PLIST(dxpl, FAIL)                                                                  \
                                                                                                             \
            if ((check_prop = H5P_exist_plist((*head)->ctx.dxpl, PROP_NAME)) < 0)                            \
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "error checking for property")                   \
        } /* end if */                                                                                       \
                                                                                                             \
        /* If property was already set or exists (for first set), update it */                               \
        if ((*head)->ctx.H5_GLUE(PROP_FIELD, _set) || check_prop > 0) {                                      \
            /* Cache the value for later, marking it to set in DXPL when context popped */                   \
            (*head)->ctx.PROP_FIELD                = PROP_FIELD;                                             \
            (*head)->ctx.H5_GLUE(PROP_FIELD, _set) = TRUE;                                                   \
        } /* end if */                                                                                       \
    }
#endif /* defined(H5_HAVE_PARALLEL) && defined(H5_HAVE_INSTRUMENTED_LIBRARY) */

/* Macro for the duplicated code to test and set properties for a property list */
#define H5CX_SET_PROP(PROP_NAME, PROP_FIELD)                                                                 \
    if ((*head)->ctx.H5_GLUE(PROP_FIELD, _set)) {                                                            \
        /* Retrieve the dataset transfer property list */                                                    \
        H5CX_RETRIEVE_PLIST(dxpl, NULL)                                                                      \
                                                                                                             \
        /* Set the property */                                                                               \
        if (H5P_set((*head)->ctx.dxpl, PROP_NAME, &(*head)->ctx.PROP_FIELD) < 0)                             \
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTSET, NULL, "error setting data xfer property")                  \
    } /* end if */

/******************/
/* Local Typedefs */
/******************/

/* Typedef for context about each API call, as it proceeds */
/* Fields in this struct are of several types:
 * - The DXPL & LAPL ID are either library default ones (from the API context
 *      initialization) or passed in from the application via an API call
 *      parameter.  The corresponding H5P_genplist_t* is just the underlying
 *      property list struct for the ID, to optimize retrieving properties
 *      from the list multiple times.
 *
 * - Internal fields, used and set only within the library, for managing the
 *      operation under way.  These do not correspond to properties in the
 *      DXPL or LAPL and can have any name.
 *
 * - Cached fields, which are not returned to the application, for managing
 *      the operation under way.  These correspond to properties in the DXPL
 *      or LAPL, and are retrieved either from the (global) cache for a
 *      default property list, or from the corresponding property in the
 *      application's (non-default) property list.  Getting / setting these
 *      properties within the library does _not_ affect the application's
 *      property list.  Note that the naming of these fields, <foo> and
 *      <foo>_valid, is important for the H5CX_RETRIEVE_PROP_VALID ahd
 *      H5CX_RETRIEVE_PROP_VALID_SET macros to work properly.
 *
 * - "Return-only"" properties that are returned to the application, mainly
 *      for sending out "introspection" information ("Why did collective I/O
 *      get broken for this operation?", "Which filters are set on the chunk I
 *      just directly read in?", etc) Setting these fields will cause the
 *      corresponding property in the property list to be set when the API
 *      context is popped, when returning from the API routine.  Note that the
 *      naming of these fields, <foo> and <foo>_set, is important for the
 *      H5CX_TEST_SET_PROP and H5CX_SET_PROP macros to work properly.
 */
typedef struct H5CX_t {
    /* DXPL */
    hid_t           dxpl_id; /* DXPL ID for API operation */
    H5P_genplist_t *dxpl;    /* Dataset Transfer Property List */

    /* LCPL */
    hid_t           lcpl_id; /* LCPL ID for API operation */
    H5P_genplist_t *lcpl;    /* Link Creation Property List */

    /* LAPL */
    hid_t           lapl_id; /* LAPL ID for API operation */
    H5P_genplist_t *lapl;    /* Link Access Property List */

    /* DCPL */
    hid_t           dcpl_id; /* DCPL ID for API operation */
    H5P_genplist_t *dcpl;    /* Dataset Creation Property List */

    /* DAPL */
    hid_t           dapl_id; /* DAPL ID for API operation */
    H5P_genplist_t *dapl;    /* Dataset Access Property List */

    /* FAPL */
    hid_t           fapl_id; /* FAPL ID for API operation */
    H5P_genplist_t *fapl;    /* File Access Property List */

    /* Internal: Object tagging info */
    haddr_t tag; /* Current object's tag (ohdr chunk #0 address) */

    /* Internal: Metadata cache info */
    H5AC_ring_t ring; /* Current metadata cache ring for entries */

#ifdef H5_HAVE_PARALLEL
    /* Internal: Parallel I/O settings */
    hbool_t      coll_metadata_read; /* Whether to use collective I/O for metadata read */
    MPI_Datatype btype;              /* MPI datatype for buffer, when using collective I/O */
    MPI_Datatype ftype;              /* MPI datatype for file, when using collective I/O */
    hbool_t      mpi_file_flushing;  /* Whether an MPI-opened file is being flushed */
    hbool_t      rank0_bcast;        /* Whether a dataset meets read-with-rank0-and-bcast requirements */
#endif                               /* H5_HAVE_PARALLEL */

    /* Cached DXPL properties */
    size_t    max_temp_buf;            /* Maximum temporary buffer size */
    hbool_t   max_temp_buf_valid;      /* Whether maximum temporary buffer size is valid */
    void     *tconv_buf;               /* Temporary conversion buffer (H5D_XFER_TCONV_BUF_NAME) */
    hbool_t   tconv_buf_valid;         /* Whether temporary conversion buffer is valid */
    void     *bkgr_buf;                /* Background conversion buffer (H5D_XFER_BKGR_BUF_NAME) */
    hbool_t   bkgr_buf_valid;          /* Whether background conversion buffer is valid */
    H5T_bkg_t bkgr_buf_type;           /* Background buffer type (H5D_XFER_BKGR_BUF_NAME) */
    hbool_t   bkgr_buf_type_valid;     /* Whether background buffer type is valid */
    double    btree_split_ratio[3];    /* B-tree split ratios */
    hbool_t   btree_split_ratio_valid; /* Whether B-tree split ratios are valid */
    size_t    vec_size;                /* Size of hyperslab vector (H5D_XFER_HYPER_VECTOR_SIZE_NAME) */
    hbool_t   vec_size_valid;          /* Whether hyperslab vector is valid */
#ifdef H5_HAVE_PARALLEL
    H5FD_mpio_xfer_t io_xfer_mode; /* Parallel transfer mode for this request (H5D_XFER_IO_XFER_MODE_NAME) */
    hbool_t          io_xfer_mode_valid;      /* Whether parallel transfer mode is valid */
    H5FD_mpio_collective_opt_t mpio_coll_opt; /* Parallel transfer with independent IO or collective IO with
                                                 this mode (H5D_XFER_MPIO_COLLECTIVE_OPT_NAME) */
    hbool_t mpio_coll_opt_valid;              /* Whether parallel transfer option is valid */
    H5FD_mpio_chunk_opt_t
             mpio_chunk_opt_mode;        /* Collective chunk option (H5D_XFER_MPIO_CHUNK_OPT_HARD_NAME) */
    hbool_t  mpio_chunk_opt_mode_valid;  /* Whether collective chunk option is valid */
    unsigned mpio_chunk_opt_num;         /* Collective chunk threshold (H5D_XFER_MPIO_CHUNK_OPT_NUM_NAME) */
    hbool_t  mpio_chunk_opt_num_valid;   /* Whether collective chunk threshold is valid */
    unsigned mpio_chunk_opt_ratio;       /* Collective chunk ratio (H5D_XFER_MPIO_CHUNK_OPT_RATIO_NAME) */
    hbool_t  mpio_chunk_opt_ratio_valid; /* Whether collective chunk ratio is valid */
#endif                                   /* H5_HAVE_PARALLEL */
    H5Z_EDC_t               err_detect;  /* Error detection info (H5D_XFER_EDC_NAME) */
    hbool_t                 err_detect_valid;     /* Whether error detection info is valid */
    H5Z_cb_t                filter_cb;            /* Filter callback function (H5D_XFER_FILTER_CB_NAME) */
    hbool_t                 filter_cb_valid;      /* Whether filter callback function is valid */
    H5Z_data_xform_t       *data_transform;       /* Data transform info (H5D_XFER_XFORM_NAME) */
    hbool_t                 data_transform_valid; /* Whether data transform info is valid */
    H5T_vlen_alloc_info_t   vl_alloc_info;        /* VL datatype alloc info (H5D_XFER_VLEN_*_NAME) */
    hbool_t                 vl_alloc_info_valid;  /* Whether VL datatype alloc info is valid */
    H5T_conv_cb_t           dt_conv_cb;           /* Datatype conversion struct (H5D_XFER_CONV_CB_NAME) */
    hbool_t                 dt_conv_cb_valid;     /* Whether datatype conversion struct is valid */
    H5D_selection_io_mode_t selection_io_mode;    /* Selection I/O mode (H5D_XFER_SELECTION_IO_MODE_NAME) */
    hbool_t                 selection_io_mode_valid; /* Whether selection I/O mode is valid */
    hbool_t                 modify_write_buf;        /* Whether the library can modify write buffers */
    hbool_t                 modify_write_buf_valid;  /* Whether the modify_write_buf field is valid */

    /* Return-only DXPL properties to return to application */
#ifdef H5_HAVE_PARALLEL
    H5D_mpio_actual_chunk_opt_mode_t mpio_actual_chunk_opt; /* Chunk optimization mode used for parallel I/O
                                                               (H5D_MPIO_ACTUAL_CHUNK_OPT_MODE_NAME) */
    hbool_t mpio_actual_chunk_opt_set; /* Whether chunk optimization mode used for parallel I/O is set */
    H5D_mpio_actual_io_mode_t
             mpio_actual_io_mode; /* Actual I/O mode used for parallel I/O (H5D_MPIO_ACTUAL_IO_MODE_NAME) */
    hbool_t  mpio_actual_io_mode_set;        /* Whether actual I/O mode used for parallel I/O is set */
    uint32_t mpio_local_no_coll_cause;       /* Local reason for breaking collective I/O
                                                (H5D_MPIO_LOCAL_NO_COLLECTIVE_CAUSE_NAME) */
    hbool_t  mpio_local_no_coll_cause_set;   /* Whether local reason for breaking collective I/O is set */
    hbool_t  mpio_local_no_coll_cause_valid; /* Whether local reason for breaking collective I/O is valid */
    uint32_t mpio_global_no_coll_cause;      /* Global reason for breaking collective I/O
                                                (H5D_MPIO_GLOBAL_NO_COLLECTIVE_CAUSE_NAME) */
    hbool_t mpio_global_no_coll_cause_set;   /* Whether global reason for breaking collective I/O is set */
    hbool_t mpio_global_no_coll_cause_valid; /* Whether global reason for breaking collective I/O is valid */
#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
    int mpio_coll_chunk_link_hard; /* Instrumented "collective chunk link hard" value
                                      (H5D_XFER_COLL_CHUNK_LINK_HARD_NAME) */
    hbool_t
        mpio_coll_chunk_link_hard_set; /* Whether instrumented "collective chunk link hard" value is set */
    int mpio_coll_chunk_multi_hard;    /* Instrumented "collective chunk multi hard" value
                                          (H5D_XFER_COLL_CHUNK_MULTI_HARD_NAME) */
    hbool_t
        mpio_coll_chunk_multi_hard_set; /* Whether instrumented "collective chunk multi hard" value is set */
    int mpio_coll_chunk_link_num_true;  /* Instrumented "collective chunk link num true" value
                                           (H5D_XFER_COLL_CHUNK_LINK_NUM_TRUE_NAME) */
    hbool_t mpio_coll_chunk_link_num_true_set;  /* Whether instrumented "collective chunk link num true" value
                                                   is set */
    int mpio_coll_chunk_link_num_false;         /* Instrumented "collective chunk link num false" value
                                                   (H5D_XFER_COLL_CHUNK_LINK_NUM_FALSE_NAME) */
    hbool_t mpio_coll_chunk_link_num_false_set; /* Whether instrumented "collective chunk link num false"
                                                   value is set */
    int mpio_coll_chunk_multi_ratio_coll;       /* Instrumented "collective chunk multi ratio coll" value
                                                   (H5D_XFER_COLL_CHUNK_MULTI_RATIO_COLL_NAME) */
    hbool_t mpio_coll_chunk_multi_ratio_coll_set; /* Whether instrumented "collective chunk multi ratio coll"
                                                     value is set */
    int mpio_coll_chunk_multi_ratio_ind;          /* Instrumented "collective chunk multi ratio ind" value
                                                     (H5D_XFER_COLL_CHUNK_MULTI_RATIO_IND_NAME) */
    hbool_t mpio_coll_chunk_multi_ratio_ind_set;  /* Whether instrumented "collective chunk multi ratio ind"
                                                     value is set */
    hbool_t mpio_coll_rank0_bcast;                /* Instrumented "collective chunk multi ratio ind" value
                                                     (H5D_XFER_COLL_CHUNK_MULTI_RATIO_IND_NAME) */
    hbool_t
        mpio_coll_rank0_bcast_set;  /* Whether instrumented "collective chunk multi ratio ind" value is set */
#endif                              /* H5_HAVE_INSTRUMENTED_LIBRARY */
#endif                              /* H5_HAVE_PARALLEL */
    uint32_t no_selection_io_cause; /* Reason for not performing selection I/O
                                          (H5D_XFER_NO_SELECTION_IO_CAUSE_NAME) */
    hbool_t no_selection_io_cause_set;   /* Whether reason for not performing selection I/O is set */
    hbool_t no_selection_io_cause_valid; /* Whether reason for not performing selection I/O is valid */

    /* Cached LCPL properties */
    H5T_cset_t encoding;                 /* Link name character encoding */
    hbool_t    encoding_valid;           /* Whether link name character encoding is valid */
    unsigned   intermediate_group;       /* Whether to create intermediate groups */
    hbool_t    intermediate_group_valid; /* Whether create intermediate group flag is valid */

    /* Cached LAPL properties */
    size_t  nlinks;       /* Number of soft / UD links to traverse (H5L_ACS_NLINKS_NAME) */
    hbool_t nlinks_valid; /* Whether number of soft / UD links to traverse is valid */

    /* Cached DCPL properties */
    hbool_t do_min_dset_ohdr;       /* Whether to minimize dataset object header */
    hbool_t do_min_dset_ohdr_valid; /* Whether minimize dataset object header flag is valid */
    uint8_t ohdr_flags;             /* Object header flags */
    hbool_t ohdr_flags_valid;       /* Whether the object headers flags are valid */

    /* Cached DAPL properties */
    const char *extfile_prefix;       /* Prefix for external file                      */
    hbool_t     extfile_prefix_valid; /* Whether the prefix for external file is valid */
    const char *vds_prefix;           /* Prefix for VDS                                */
    hbool_t     vds_prefix_valid;     /* Whether the prefix for VDS is valid           */

    /* Cached FAPL properties */
    H5F_libver_t low_bound;        /* low_bound property for H5Pset_libver_bounds() */
    hbool_t      low_bound_valid;  /* Whether low_bound property is valid */
    H5F_libver_t high_bound;       /* high_bound property for H5Pset_libver_bounds */
    hbool_t      high_bound_valid; /* Whether high_bound property is valid */

    /* Cached VOL settings */
    H5VL_connector_prop_t vol_connector_prop; /* Property for VOL connector ID & info */
    hbool_t vol_connector_prop_valid;         /* Whether property for VOL connector ID & info is valid */
    void   *vol_wrap_ctx;                     /* VOL connector's "wrap context" for creating IDs */
    hbool_t vol_wrap_ctx_valid; /* Whether VOL connector's "wrap context" for creating IDs is valid */
} H5CX_t;

/* Typedef for nodes on the API context stack */
/* Each entry into the library through an API routine invokes H5CX_push()
 * in a FUNC_ENTER_API* macro, which pushes an H5CX_node_t on the API
 * context [thread-local] stack, after initializing it with default values
 * in H5CX__push_common().
 */
typedef struct H5CX_node_t {
    H5CX_t              ctx;  /* Context for current API call */
    struct H5CX_node_t *next; /* Pointer to previous context, on stack */
} H5CX_node_t;

/* Typedef for cached default dataset transfer property list information */
/* This is initialized to the values in the default DXPL during package
 * initialization and then remains constant for the rest of the library's
 * operation.  When a field in H5CX_t is retrieved from an API context that
 * uses a default DXPL, this value is copied instead of spending time looking
 * up the property in the DXPL.
 */
typedef struct H5CX_dxpl_cache_t {
    size_t    max_temp_buf;         /* Maximum temporary buffer size (H5D_XFER_MAX_TEMP_BUF_NAME) */
    void     *tconv_buf;            /* Temporary conversion buffer (H5D_XFER_TCONV_BUF_NAME) */
    void     *bkgr_buf;             /* Background conversion buffer (H5D_XFER_BKGR_BUF_NAME) */
    H5T_bkg_t bkgr_buf_type;        /* Background buffer type (H5D_XFER_BKGR_BUF_NAME) */
    double    btree_split_ratio[3]; /* B-tree split ratios (H5D_XFER_BTREE_SPLIT_RATIO_NAME) */
    size_t    vec_size;             /* Size of hyperslab vector (H5D_XFER_HYPER_VECTOR_SIZE_NAME) */
#ifdef H5_HAVE_PARALLEL
    H5FD_mpio_xfer_t io_xfer_mode; /* Parallel transfer mode for this request (H5D_XFER_IO_XFER_MODE_NAME) */
    H5FD_mpio_collective_opt_t mpio_coll_opt; /* Parallel transfer with independent IO or collective IO with
                                                 this mode (H5D_XFER_MPIO_COLLECTIVE_OPT_NAME) */
    uint32_t mpio_local_no_coll_cause;        /* Local reason for breaking collective I/O
                                                 (H5D_MPIO_LOCAL_NO_COLLECTIVE_CAUSE_NAME) */
    uint32_t mpio_global_no_coll_cause;       /* Global reason for breaking collective I/O
                                                 (H5D_MPIO_GLOBAL_NO_COLLECTIVE_CAUSE_NAME) */
    H5FD_mpio_chunk_opt_t
             mpio_chunk_opt_mode;       /* Collective chunk option (H5D_XFER_MPIO_CHUNK_OPT_HARD_NAME) */
    unsigned mpio_chunk_opt_num;        /* Collective chunk threshold (H5D_XFER_MPIO_CHUNK_OPT_NUM_NAME) */
    unsigned mpio_chunk_opt_ratio;      /* Collective chunk ratio (H5D_XFER_MPIO_CHUNK_OPT_RATIO_NAME) */
#endif                                  /* H5_HAVE_PARALLEL */
    H5Z_EDC_t               err_detect; /* Error detection info (H5D_XFER_EDC_NAME) */
    H5Z_cb_t                filter_cb;  /* Filter callback function (H5D_XFER_FILTER_CB_NAME) */
    H5Z_data_xform_t       *data_transform;        /* Data transform info (H5D_XFER_XFORM_NAME) */
    H5T_vlen_alloc_info_t   vl_alloc_info;         /* VL datatype alloc info (H5D_XFER_VLEN_*_NAME) */
    H5T_conv_cb_t           dt_conv_cb;            /* Datatype conversion struct (H5D_XFER_CONV_CB_NAME) */
    H5D_selection_io_mode_t selection_io_mode;     /* Selection I/O mode (H5D_XFER_SELECTION_IO_MODE_NAME) */
    uint32_t                no_selection_io_cause; /* Reasons for not performing selection I/O
                                                            (H5D_XFER_NO_SELECTION_IO_CAUSE_NAME) */
    hbool_t modify_write_buf;                      /* Whether the library can modify write buffers */
} H5CX_dxpl_cache_t;

/* Typedef for cached default link creation property list information */
/* (Same as the cached DXPL struct, above, except for the default LCPL) */
typedef struct H5CX_lcpl_cache_t {
    H5T_cset_t encoding;           /* Link name character encoding */
    unsigned   intermediate_group; /* Whether to create intermediate groups  */
} H5CX_lcpl_cache_t;

/* Typedef for cached default link access property list information */
/* (Same as the cached DXPL struct, above, except for the default LAPL) */
typedef struct H5CX_lapl_cache_t {
    size_t nlinks; /* Number of soft / UD links to traverse (H5L_ACS_NLINKS_NAME) */
} H5CX_lapl_cache_t;

/* Typedef for cached default dataset creation property list information */
/* (Same as the cached DXPL struct, above, except for the default DCPL) */
typedef struct H5CX_dcpl_cache_t {
    hbool_t do_min_dset_ohdr; /* Whether to minimize dataset object header */
    uint8_t ohdr_flags;       /* Object header flags */
} H5CX_dcpl_cache_t;

/* Typedef for cached default dataset access property list information */
/* (Same as the cached DXPL struct, above, except for the default DXPL) */
typedef struct H5CX_dapl_cache_t {
    const char *extfile_prefix; /* Prefix for external file */
    const char *vds_prefix;     /* Prefix for VDS           */
} H5CX_dapl_cache_t;

/* Typedef for cached default file access property list information */
/* (Same as the cached DXPL struct, above, except for the default DCPL) */
typedef struct H5CX_fapl_cache_t {
    H5F_libver_t low_bound;  /* low_bound property for H5Pset_libver_bounds() */
    H5F_libver_t high_bound; /* high_bound property for H5Pset_libver_bounds */
} H5CX_fapl_cache_t;

/********************/
/* Local Prototypes */
/********************/
#ifdef H5_HAVE_THREADSAFE
static H5CX_node_t **H5CX__get_context(void);
#endif /* H5_HAVE_THREADSAFE */
static void         H5CX__push_common(H5CX_node_t *cnode);
static H5CX_node_t *H5CX__pop_common(hbool_t update_dxpl_props);

/*********************/
/* Package Variables */
/*********************/

/*******************/
/* Local Variables */
/*******************/

#ifndef H5_HAVE_THREADSAFE
static H5CX_node_t *H5CX_head_g = NULL; /* Pointer to head of context stack */
#endif                                  /* H5_HAVE_THREADSAFE */

/* Define a "default" dataset transfer property list cache structure to use for default DXPLs */
static H5CX_dxpl_cache_t H5CX_def_dxpl_cache;

/* Define a "default" link creation property list cache structure to use for default LCPLs */
static H5CX_lcpl_cache_t H5CX_def_lcpl_cache;

/* Define a "default" link access property list cache structure to use for default LAPLs */
static H5CX_lapl_cache_t H5CX_def_lapl_cache;

/* Define a "default" dataset creation property list cache structure to use for default DCPLs */
static H5CX_dcpl_cache_t H5CX_def_dcpl_cache;

/* Define a "default" dataset access property list cache structure to use for default DAPLs */
static H5CX_dapl_cache_t H5CX_def_dapl_cache;

/* Define a "default" file access property list cache structure to use for default FAPLs */
static H5CX_fapl_cache_t H5CX_def_fapl_cache;

/* Declare a static free list to manage H5CX_node_t structs */
H5FL_DEFINE_STATIC(H5CX_node_t);

/* Declare a static free list to manage H5CX_state_t structs */
H5FL_DEFINE_STATIC(H5CX_state_t);

/*-------------------------------------------------------------------------
 * Function:    H5CX_init
 *
 * Purpose:     Initialize the interface from some other layer.
 *
 * Return:      Success:        non-negative
 *              Failure:        negative
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_init(void)
{
    H5P_genplist_t *dx_plist;            /* Data transfer property list */
    H5P_genplist_t *lc_plist;            /* Link creation property list */
    H5P_genplist_t *la_plist;            /* Link access property list */
    H5P_genplist_t *dc_plist;            /* Dataset creation property list */
    H5P_genplist_t *da_plist;            /* Dataset access property list */
    H5P_genplist_t *fa_plist;            /* File access property list */
    herr_t          ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Reset the "default DXPL cache" information */
    memset(&H5CX_def_dxpl_cache, 0, sizeof(H5CX_dxpl_cache_t));

    /* Get the default DXPL cache information */

    /* Get the default dataset transfer property list */
    if (NULL == (dx_plist = (H5P_genplist_t *)H5I_object(H5P_DATASET_XFER_DEFAULT)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL, "not a dataset transfer property list")

    /* Get B-tree split ratios */
    if (H5P_get(dx_plist, H5D_XFER_BTREE_SPLIT_RATIO_NAME, &H5CX_def_dxpl_cache.btree_split_ratio) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve B-tree split ratios")

    /* Get maximum temporary buffer size value */
    if (H5P_get(dx_plist, H5D_XFER_MAX_TEMP_BUF_NAME, &H5CX_def_dxpl_cache.max_temp_buf) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve maximum temporary buffer size")

    /* Get temporary buffer pointer */
    if (H5P_get(dx_plist, H5D_XFER_TCONV_BUF_NAME, &H5CX_def_dxpl_cache.tconv_buf) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve temporary buffer pointer")

    /* Get background buffer pointer */
    if (H5P_get(dx_plist, H5D_XFER_BKGR_BUF_NAME, &H5CX_def_dxpl_cache.bkgr_buf) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve background buffer pointer")

    /* Get background buffer type */
    if (H5P_get(dx_plist, H5D_XFER_BKGR_BUF_TYPE_NAME, &H5CX_def_dxpl_cache.bkgr_buf_type) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve background buffer type")

    /* Get I/O vector size */
    if (H5P_get(dx_plist, H5D_XFER_HYPER_VECTOR_SIZE_NAME, &H5CX_def_dxpl_cache.vec_size) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve I/O vector size")

#ifdef H5_HAVE_PARALLEL
    /* Collect Parallel I/O information for possible later use */
    if (H5P_get(dx_plist, H5D_XFER_IO_XFER_MODE_NAME, &H5CX_def_dxpl_cache.io_xfer_mode) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve parallel transfer method")
    if (H5P_get(dx_plist, H5D_XFER_MPIO_COLLECTIVE_OPT_NAME, &H5CX_def_dxpl_cache.mpio_coll_opt) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve collective transfer option")
    if (H5P_get(dx_plist, H5D_XFER_MPIO_CHUNK_OPT_HARD_NAME, &H5CX_def_dxpl_cache.mpio_chunk_opt_mode) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve chunk optimization option")
    if (H5P_get(dx_plist, H5D_XFER_MPIO_CHUNK_OPT_NUM_NAME, &H5CX_def_dxpl_cache.mpio_chunk_opt_num) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve chunk optimization threshold")
    if (H5P_get(dx_plist, H5D_XFER_MPIO_CHUNK_OPT_RATIO_NAME, &H5CX_def_dxpl_cache.mpio_chunk_opt_ratio) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve chunk optimization ratio")

    /* Get the local & global reasons for breaking collective I/O values */
    if (H5P_get(dx_plist, H5D_MPIO_LOCAL_NO_COLLECTIVE_CAUSE_NAME,
                &H5CX_def_dxpl_cache.mpio_local_no_coll_cause) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve local cause for breaking collective I/O")
    if (H5P_get(dx_plist, H5D_MPIO_GLOBAL_NO_COLLECTIVE_CAUSE_NAME,
                &H5CX_def_dxpl_cache.mpio_global_no_coll_cause) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve global cause for breaking collective I/O")
#endif /* H5_HAVE_PARALLEL */

    /* Get error detection properties */
    if (H5P_get(dx_plist, H5D_XFER_EDC_NAME, &H5CX_def_dxpl_cache.err_detect) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve error detection info")

    /* Get filter callback function */
    if (H5P_get(dx_plist, H5D_XFER_FILTER_CB_NAME, &H5CX_def_dxpl_cache.filter_cb) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve filter callback function")

    /* Look at the data transform property */
    /* (Note: 'peek', not 'get' - if this turns out to be a problem, we may need
     *          to copy it and free this in the H5CX terminate routine. -QAK)
     */
    if (H5P_peek(dx_plist, H5D_XFER_XFORM_NAME, &H5CX_def_dxpl_cache.data_transform) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve data transform info")

    /* Get VL datatype alloc info */
    if (H5P_get(dx_plist, H5D_XFER_VLEN_ALLOC_NAME, &H5CX_def_dxpl_cache.vl_alloc_info.alloc_func) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VL datatype alloc info")
    if (H5P_get(dx_plist, H5D_XFER_VLEN_ALLOC_INFO_NAME, &H5CX_def_dxpl_cache.vl_alloc_info.alloc_info) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VL datatype alloc info")
    if (H5P_get(dx_plist, H5D_XFER_VLEN_FREE_NAME, &H5CX_def_dxpl_cache.vl_alloc_info.free_func) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VL datatype alloc info")
    if (H5P_get(dx_plist, H5D_XFER_VLEN_FREE_INFO_NAME, &H5CX_def_dxpl_cache.vl_alloc_info.free_info) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VL datatype alloc info")

    /* Get datatype conversion struct */
    if (H5P_get(dx_plist, H5D_XFER_CONV_CB_NAME, &H5CX_def_dxpl_cache.dt_conv_cb) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve datatype conversion exception callback")

    /* Get the selection I/O mode */
    if (H5P_get(dx_plist, H5D_XFER_SELECTION_IO_MODE_NAME, &H5CX_def_dxpl_cache.selection_io_mode) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve parallel transfer method")

    /* Get the local & global reasons for breaking selection I/O values */
    if (H5P_get(dx_plist, H5D_XFER_NO_SELECTION_IO_CAUSE_NAME, &H5CX_def_dxpl_cache.no_selection_io_cause) <
        0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve cause for no selection I/O")

    /* Get the modify write buffer property */
    if (H5P_get(dx_plist, H5D_XFER_MODIFY_WRITE_BUF_NAME, &H5CX_def_dxpl_cache.modify_write_buf) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve modify write buffer property")

    /* Reset the "default LCPL cache" information */
    memset(&H5CX_def_lcpl_cache, 0, sizeof(H5CX_lcpl_cache_t));

    /* Get the default LCPL cache information */

    /* Get the default link creation property list */
    if (NULL == (lc_plist = (H5P_genplist_t *)H5I_object(H5P_LINK_CREATE_DEFAULT)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL, "not a link creation property list")

    /* Get link name character encoding */
    if (H5P_get(lc_plist, H5P_STRCRT_CHAR_ENCODING_NAME, &H5CX_def_lcpl_cache.encoding) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve link name encoding")

    /* Get flag whether to create intermediate groups */
    if (H5P_get(lc_plist, H5L_CRT_INTERMEDIATE_GROUP_NAME, &H5CX_def_lcpl_cache.intermediate_group) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve intermediate group creation flag")

    /* Reset the "default LAPL cache" information */
    memset(&H5CX_def_lapl_cache, 0, sizeof(H5CX_lapl_cache_t));

    /* Get the default LAPL cache information */

    /* Get the default link access property list */
    if (NULL == (la_plist = (H5P_genplist_t *)H5I_object(H5P_LINK_ACCESS_DEFAULT)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL, "not a link access property list")

    /* Get number of soft / UD links to traverse */
    if (H5P_get(la_plist, H5L_ACS_NLINKS_NAME, &H5CX_def_lapl_cache.nlinks) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve number of soft / UD links to traverse")

    /* Reset the "default DCPL cache" information */
    memset(&H5CX_def_dcpl_cache, 0, sizeof(H5CX_dcpl_cache_t));

    /* Get the default DCPL cache information */

    /* Get the default dataset creation property list */
    if (NULL == (dc_plist = (H5P_genplist_t *)H5I_object(H5P_DATASET_CREATE_DEFAULT)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL, "not a dataset create property list")

    /* Get flag to indicate whether to minimize dataset object header */
    if (H5P_get(dc_plist, H5D_CRT_MIN_DSET_HDR_SIZE_NAME, &H5CX_def_dcpl_cache.do_min_dset_ohdr) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve dataset minimize flag")

    /* Get object header flags */
    if (H5P_get(dc_plist, H5O_CRT_OHDR_FLAGS_NAME, &H5CX_def_dcpl_cache.ohdr_flags) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve object header flags")

    /* Reset the "default DAPL cache" information */
    memset(&H5CX_def_dapl_cache, 0, sizeof(H5CX_dapl_cache_t));

    /* Get the default DAPL cache information */

    /* Get the default dataset access property list */
    if (NULL == (da_plist = (H5P_genplist_t *)H5I_object(H5P_DATASET_ACCESS_DEFAULT)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL, "not a dataset create property list")

    /* Get the prefix for the external file */
    if (H5P_peek(da_plist, H5D_ACS_EFILE_PREFIX_NAME, &H5CX_def_dapl_cache.extfile_prefix) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve prefix for external file")

    /* Get the prefix for the VDS file */
    if (H5P_peek(da_plist, H5D_ACS_VDS_PREFIX_NAME, &H5CX_def_dapl_cache.vds_prefix) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve prefix for VDS")

    /* Reset the "default FAPL cache" information */
    memset(&H5CX_def_fapl_cache, 0, sizeof(H5CX_fapl_cache_t));

    /* Get the default FAPL cache information */

    /* Get the default file access property list */
    if (NULL == (fa_plist = (H5P_genplist_t *)H5I_object(H5P_FILE_ACCESS_DEFAULT)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL, "not a dataset create property list")

    /* Get low_bound */
    if (H5P_get(fa_plist, H5F_ACS_LIBVER_LOW_BOUND_NAME, &H5CX_def_fapl_cache.low_bound) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve dataset minimize flag")

    if (H5P_get(fa_plist, H5F_ACS_LIBVER_HIGH_BOUND_NAME, &H5CX_def_fapl_cache.high_bound) < 0)
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve dataset minimize flag")
done:
    FUNC_LEAVE_NOAPI(ret_value)
}

/*-------------------------------------------------------------------------
 * Function: H5CX_term_package
 *
 * Purpose:  Terminate this interface.
 *
 * Return:   Success:    Positive if anything was done that might
 *                affect other interfaces; zero otherwise.
 *            Failure:    Negative.
 *
 *-------------------------------------------------------------------------
 */
int
H5CX_term_package(void)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    H5CX_node_t *cnode; /* Context node */

    /* Pop the top context node from the stack */
    /* (Can't check for errors, as rest of library is shut down) */
    cnode = H5CX__pop_common(FALSE);

    /* Free the context node */
    /* (Allocated with malloc() in H5CX_push_special() ) */
    free(cnode);

#ifndef H5_HAVE_THREADSAFE
    H5CX_head_g = NULL;
#endif /* H5_HAVE_THREADSAFE */

    FUNC_LEAVE_NOAPI(0)
} /* end H5CX_term_package() */

#ifdef H5_HAVE_THREADSAFE
/*-------------------------------------------------------------------------
 * Function:	H5CX__get_context
 *
 * Purpose:	Support function for H5CX_get_my_context() to initialize and
 *              acquire per-thread API context stack.
 *
 * Return:	Success: Non-NULL pointer to head pointer of API context stack for thread
 *		Failure: NULL
 *
 *-------------------------------------------------------------------------
 */
static H5CX_node_t **
H5CX__get_context(void)
{
    H5CX_node_t **ctx = NULL;

    FUNC_ENTER_PACKAGE_NOERR

    ctx = (H5CX_node_t **)H5TS_get_thread_local_value(H5TS_apictx_key_g);

    if (!ctx) {
        /* No associated value with current thread - create one */
#ifdef H5_HAVE_WIN_THREADS
        /* Win32 has to use LocalAlloc to match the LocalFree in DllMain */
        ctx = (H5CX_node_t **)LocalAlloc(LPTR, sizeof(H5CX_node_t *));
#else
        /* Use malloc here since this has to match the free in the
         * destructor and we want to avoid the codestack there.
         */
        ctx = (H5CX_node_t **)malloc(sizeof(H5CX_node_t *));
#endif /* H5_HAVE_WIN_THREADS */
        assert(ctx);

        /* Reset the thread-specific info */
        *ctx = NULL;

        /* (It's not necessary to release this in this API, it is
         *      released by the "key destructor" set up in the H5TS
         *      routines.  See calls to pthread_key_create() in H5TS.c -QAK)
         */
        H5TS_set_thread_local_value(H5TS_apictx_key_g, (void *)ctx);
    } /* end if */

    /* Set return value */
    FUNC_LEAVE_NOAPI(ctx)
} /* end H5CX__get_context() */
#endif /* H5_HAVE_THREADSAFE */

/*-------------------------------------------------------------------------
 * Function:    H5CX__push_common
 *
 * Purpose:     Internal routine to push a context for an API call.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
static void
H5CX__push_common(H5CX_node_t *cnode)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_PACKAGE_NOERR

    /* Sanity check */
    assert(cnode);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head);

    /* Set non-zero context info */
    cnode->ctx.dxpl_id = H5P_DATASET_XFER_DEFAULT;
    cnode->ctx.dcpl_id = H5P_DATASET_CREATE_DEFAULT;
    cnode->ctx.dapl_id = H5P_DATASET_ACCESS_DEFAULT;
    cnode->ctx.lcpl_id = H5P_LINK_CREATE_DEFAULT;
    cnode->ctx.lapl_id = H5P_LINK_ACCESS_DEFAULT;
    cnode->ctx.fapl_id = H5P_FILE_ACCESS_DEFAULT;
    cnode->ctx.tag     = H5AC__INVALID_TAG;
    cnode->ctx.ring    = H5AC_RING_USER;

    /* Push context node onto stack */
    cnode->next = *head;
    *head       = cnode;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX__push_common() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_push
 *
 * Purpose:     Pushes a context for an API call.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_push(void)
{
    H5CX_node_t *cnode     = NULL;    /* Context node */
    herr_t       ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Allocate & clear API context node */
    if (NULL == (cnode = H5FL_CALLOC(H5CX_node_t)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTALLOC, FAIL, "unable to allocate new struct")

    /* Set context info */
    H5CX__push_common(cnode);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_push() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_push_special
 *
 * Purpose:     Pushes a context for an API call, without using library routines.
 *
 * Note:	This should only be called in special circumstances, like H5close.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_push_special(void)
{
    H5CX_node_t *cnode = NULL; /* Context node */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Allocate & clear API context node, without using library API routines */
    cnode = (H5CX_node_t *)calloc(1, sizeof(H5CX_node_t));
    assert(cnode);

    /* Set context info */
    H5CX__push_common(cnode);

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_push_special() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_retrieve_state
 *
 * Purpose:     Retrieve the state of an API context, for later resumption.
 *
 * Note:	This routine _only_ tracks the state of API context information
 *		set before the VOL callback is invoked, not values that are
 *		set internal to the library.  It's main purpose is to provide
 *		API context state to VOL connectors.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_retrieve_state(H5CX_state_t **api_state)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(api_state);

    /* Allocate & clear API context state */
    if (NULL == (*api_state = H5FL_CALLOC(H5CX_state_t)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTALLOC, FAIL, "unable to allocate new API context state")

    /* Check for non-default DCPL */
    if (H5P_DATASET_CREATE_DEFAULT != (*head)->ctx.dcpl_id) {
        /* Retrieve the DCPL property list */
        H5CX_RETRIEVE_PLIST(dcpl, FAIL)

        /* Copy the DCPL ID */
        if (((*api_state)->dcpl_id = H5P_copy_plist((H5P_genplist_t *)(*head)->ctx.dcpl, FALSE)) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTCOPY, FAIL, "can't copy property list")
    } /* end if */
    else
        (*api_state)->dcpl_id = H5P_DATASET_CREATE_DEFAULT;

    /* Check for non-default DXPL */
    if (H5P_DATASET_XFER_DEFAULT != (*head)->ctx.dxpl_id) {
        /* Retrieve the DXPL property list */
        H5CX_RETRIEVE_PLIST(dxpl, FAIL)

        /* Copy the DXPL ID */
        if (((*api_state)->dxpl_id = H5P_copy_plist((H5P_genplist_t *)(*head)->ctx.dxpl, FALSE)) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTCOPY, FAIL, "can't copy property list")
    } /* end if */
    else
        (*api_state)->dxpl_id = H5P_DATASET_XFER_DEFAULT;

    /* Check for non-default LAPL */
    if (H5P_LINK_ACCESS_DEFAULT != (*head)->ctx.lapl_id) {
        /* Retrieve the LAPL property list */
        H5CX_RETRIEVE_PLIST(lapl, FAIL)

        /* Copy the LAPL ID */
        if (((*api_state)->lapl_id = H5P_copy_plist((H5P_genplist_t *)(*head)->ctx.lapl, FALSE)) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTCOPY, FAIL, "can't copy property list")
    } /* end if */
    else
        (*api_state)->lapl_id = H5P_LINK_ACCESS_DEFAULT;

    /* Check for non-default LCPL */
    if (H5P_LINK_CREATE_DEFAULT != (*head)->ctx.lcpl_id) {
        /* Retrieve the LCPL property list */
        H5CX_RETRIEVE_PLIST(lcpl, FAIL)

        /* Copy the LCPL ID */
        if (((*api_state)->lcpl_id = H5P_copy_plist((H5P_genplist_t *)(*head)->ctx.lcpl, FALSE)) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTCOPY, FAIL, "can't copy property list")
    } /* end if */
    else
        (*api_state)->lcpl_id = H5P_LINK_CREATE_DEFAULT;

    /* Keep a reference to the current VOL wrapping context */
    (*api_state)->vol_wrap_ctx = (*head)->ctx.vol_wrap_ctx;
    if (NULL != (*api_state)->vol_wrap_ctx) {
        assert((*head)->ctx.vol_wrap_ctx_valid);
        if (H5VL_inc_vol_wrapper((*api_state)->vol_wrap_ctx) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTINC, FAIL, "can't increment refcount on VOL wrapping context")
    } /* end if */

    /* Keep a copy of the VOL connector property, if there is one */
    if ((*head)->ctx.vol_connector_prop_valid && (*head)->ctx.vol_connector_prop.connector_id > 0) {
        /* Get the connector property */
        H5MM_memcpy(&(*api_state)->vol_connector_prop, &(*head)->ctx.vol_connector_prop,
                    sizeof(H5VL_connector_prop_t));

        /* Check for actual VOL connector property */
        if ((*api_state)->vol_connector_prop.connector_id) {
            /* Copy connector info, if it exists */
            if ((*api_state)->vol_connector_prop.connector_info) {
                H5VL_class_t *connector;                 /* Pointer to connector */
                void         *new_connector_info = NULL; /* Copy of connector info */

                /* Retrieve the connector for the ID */
                if (NULL ==
                    (connector = (H5VL_class_t *)H5I_object((*api_state)->vol_connector_prop.connector_id)))
                    HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL, "not a VOL connector ID")

                /* Allocate and copy connector info */
                if (H5VL_copy_connector_info(connector, &new_connector_info,
                                             (*api_state)->vol_connector_prop.connector_info) < 0)
                    HGOTO_ERROR(H5E_CONTEXT, H5E_CANTCOPY, FAIL, "connector info copy failed")
                (*api_state)->vol_connector_prop.connector_info = new_connector_info;
            } /* end if */

            /* Increment the refcount on the connector ID */
            if (H5I_inc_ref((*api_state)->vol_connector_prop.connector_id, FALSE) < 0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTINC, FAIL, "incrementing VOL connector ID failed")
        } /* end if */
    }     /* end if */

#ifdef H5_HAVE_PARALLEL
    /* Save parallel I/O settings */
    (*api_state)->coll_metadata_read = (*head)->ctx.coll_metadata_read;
#endif /* H5_HAVE_PARALLEL */

done:
    /* Cleanup on error */
    if (ret_value < 0) {
        if (*api_state) {
            /* Release the (possibly partially allocated) API state struct */
            if (H5CX_free_state(*api_state) < 0)
                HDONE_ERROR(H5E_CONTEXT, H5E_CANTRELEASE, FAIL, "unable to release API state")
            *api_state = NULL;
        } /* end if */
    }     /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_retrieve_state() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_restore_state
 *
 * Purpose:     Restore an API context, from a previously retrieved state.
 *
 * Note:	This routine _only_ resets the state of API context information
 *		set before the VOL callback is invoked, not values that are
 *		set internal to the library.  It's main purpose is to restore
 *		API context state from VOL connectors.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_restore_state(const H5CX_state_t *api_state)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(api_state);

    /* Restore the DCPL info */
    (*head)->ctx.dcpl_id = api_state->dcpl_id;
    (*head)->ctx.dcpl    = NULL;

    /* Restore the DXPL info */
    (*head)->ctx.dxpl_id = api_state->dxpl_id;
    (*head)->ctx.dxpl    = NULL;

    /* Restore the LAPL info */
    (*head)->ctx.lapl_id = api_state->lapl_id;
    (*head)->ctx.lapl    = NULL;

    /* Restore the LCPL info */
    (*head)->ctx.lcpl_id = api_state->lcpl_id;
    (*head)->ctx.lcpl    = NULL;

    /* Restore the VOL wrapper context */
    (*head)->ctx.vol_wrap_ctx = api_state->vol_wrap_ctx;
    if (NULL != (*head)->ctx.vol_wrap_ctx)
        (*head)->ctx.vol_wrap_ctx_valid = TRUE;

    /* Restore the VOL connector info */
    if (api_state->vol_connector_prop.connector_id) {
        H5MM_memcpy(&(*head)->ctx.vol_connector_prop, &api_state->vol_connector_prop,
                    sizeof(H5VL_connector_prop_t));
        (*head)->ctx.vol_connector_prop_valid = TRUE;
    } /* end if */

#ifdef H5_HAVE_PARALLEL
    /* Restore parallel I/O settings */
    (*head)->ctx.coll_metadata_read = api_state->coll_metadata_read;
#endif /* H5_HAVE_PARALLEL */

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5CX_restore_state() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_free_state
 *
 * Purpose:     Free a previously retrievedAPI context state
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_free_state(H5CX_state_t *api_state)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(api_state);

    /* Release the DCPL */
    if (0 != api_state->dcpl_id && H5P_DATASET_CREATE_DEFAULT != api_state->dcpl_id)
        if (H5I_dec_ref(api_state->dcpl_id) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTDEC, FAIL, "can't decrement refcount on DCPL")

    /* Release the DXPL */
    if (0 != api_state->dxpl_id && H5P_DATASET_XFER_DEFAULT != api_state->dxpl_id)
        if (H5I_dec_ref(api_state->dxpl_id) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTDEC, FAIL, "can't decrement refcount on DXPL")

    /* Release the LAPL */
    if (0 != api_state->lapl_id && H5P_LINK_ACCESS_DEFAULT != api_state->lapl_id)
        if (H5I_dec_ref(api_state->lapl_id) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTDEC, FAIL, "can't decrement refcount on LAPL")

    /* Release the LCPL */
    if (0 != api_state->lcpl_id && H5P_LINK_CREATE_DEFAULT != api_state->lcpl_id)
        if (H5I_dec_ref(api_state->lcpl_id) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTDEC, FAIL, "can't decrement refcount on LCPL")

    /* Release the VOL wrapper context */
    if (api_state->vol_wrap_ctx)
        if (H5VL_dec_vol_wrapper(api_state->vol_wrap_ctx) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTDEC, FAIL, "can't decrement refcount on VOL wrapping context")

    /* Release the VOL connector property, if it was set */
    if (api_state->vol_connector_prop.connector_id) {
        /* Clean up any VOL connector info */
        if (api_state->vol_connector_prop.connector_info)
            if (H5VL_free_connector_info(api_state->vol_connector_prop.connector_id,
                                         api_state->vol_connector_prop.connector_info) < 0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTRELEASE, FAIL, "unable to release VOL connector info object")
        /* Decrement connector ID */
        if (H5I_dec_ref(api_state->vol_connector_prop.connector_id) < 0)
            HDONE_ERROR(H5E_CONTEXT, H5E_CANTDEC, FAIL, "can't close VOL connector ID")
    } /* end if */

    /* Free the state */
    api_state = H5FL_FREE(H5CX_state_t, api_state);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_free_state() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_is_def_dxpl
 *
 * Purpose:     Checks if the API context is using the library's default DXPL
 *
 * Return:      TRUE / FALSE (can't fail)
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5CX_is_def_dxpl(void)
{
    H5CX_node_t **head        = NULL;  /* Pointer to head of API context list */
    hbool_t       is_def_dxpl = FALSE; /* Flag to indicate DXPL is default */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set return value */
    is_def_dxpl = ((*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT);

    FUNC_LEAVE_NOAPI(is_def_dxpl)
} /* end H5CX_is_def_dxpl() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_dxpl
 *
 * Purpose:     Sets the DXPL for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_dxpl(hid_t dxpl_id)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context's DXPL to a new value */
    (*head)->ctx.dxpl_id = dxpl_id;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_dxpl() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_dcpl
 *
 * Purpose:     Sets the DCPL for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_dcpl(hid_t dcpl_id)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context's DCPL to a new value */
    (*head)->ctx.dcpl_id = dcpl_id;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_dcpl() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_libver_bounds
 *
 * Purpose:     Sets the low/high bounds according to "f" for the current API call context.
 *              When "f" is NULL, the low/high bounds are set to latest format.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_libver_bounds(H5F_t *f)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context value */
    (*head)->ctx.low_bound  = (f == NULL) ? H5F_LIBVER_LATEST : H5F_LOW_BOUND(f);
    (*head)->ctx.high_bound = (f == NULL) ? H5F_LIBVER_LATEST : H5F_HIGH_BOUND(f);

    /* Mark the values as valid */
    (*head)->ctx.low_bound_valid  = TRUE;
    (*head)->ctx.high_bound_valid = TRUE;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_libver_bounds() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_lcpl
 *
 * Purpose:     Sets the LCPL for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_lcpl(hid_t lcpl_id)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context's LCPL to a new value */
    (*head)->ctx.lcpl_id = lcpl_id;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_lcpl() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_lapl
 *
 * Purpose:     Sets the LAPL for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_lapl(hid_t lapl_id)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context's LAPL to a new value */
    (*head)->ctx.lapl_id = lapl_id;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_lapl() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_apl
 *
 * Purpose:     Validaties an access property list, and sanity checking &
 *              setting up collective operations.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_apl(hid_t *acspl_id, const H5P_libclass_t *libclass,
             hid_t
#ifndef H5_HAVE_PARALLEL
                 H5_ATTR_UNUSED
#endif /* H5_HAVE_PARALLEL */
                     loc_id,
             hbool_t
#ifndef H5_HAVE_PARALLEL
                 H5_ATTR_UNUSED
#endif /* H5_HAVE_PARALLEL */
                     is_collective)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(acspl_id);
    assert(libclass);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set access plist to the default property list of the appropriate class if it's the generic default */
    if (H5P_DEFAULT == *acspl_id)
        *acspl_id = *libclass->def_plist_id;
    else {
        htri_t is_lapl; /* Whether the access property list is (or is derived from) a link access property
                           list */
        htri_t is_dapl; /* Whether the access property list is (or is derived from) a dataset access property
                           list */
        htri_t is_fapl; /* Whether the access property list is (or is derived from) a file access property
                           list */

#ifdef H5CX_DEBUG
        /* Sanity check the access property list class */
        if (TRUE != H5P_isa_class(*acspl_id, *libclass->class_id))
            HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL, "not the required access property list")
#endif /* H5CX_DEBUG*/

        /* Check for link access property and set API context if so */
        if ((is_lapl = H5P_class_isa(*libclass->pclass, *H5P_CLS_LACC->pclass)) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "can't check for link access class")
        else if (is_lapl)
            (*head)->ctx.lapl_id = *acspl_id;

        /* Check for dataset access property and set API context if so */
        if ((is_dapl = H5P_class_isa(*libclass->pclass, *H5P_CLS_DACC->pclass)) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "can't check for dataset access class")
        else if (is_dapl)
            (*head)->ctx.dapl_id = *acspl_id;

        /* Check for file access property and set API context if so */
        if ((is_fapl = H5P_class_isa(*libclass->pclass, *H5P_CLS_FACC->pclass)) < 0)
            HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "can't check for file access class")
        else if (is_fapl)
            (*head)->ctx.fapl_id = *acspl_id;

#ifdef H5_HAVE_PARALLEL
        /* If this routine is not guaranteed to be collective (i.e. it doesn't
         * modify the structural metadata in a file), check if the application
         * specified a collective metadata read for just this operation.
         */
        if (!is_collective) {
            H5P_genplist_t         *plist;        /* Property list pointer */
            H5P_coll_md_read_flag_t md_coll_read; /* Collective metadata read flag */

            /* Get the plist structure for the access property list */
            if (NULL == (plist = (H5P_genplist_t *)H5I_object(*acspl_id)))
                HGOTO_ERROR(H5E_CONTEXT, H5E_BADID, FAIL, "can't find object for ID")

            /* Get the collective metadata read flag */
            if (H5P_peek(plist, H5_COLL_MD_READ_FLAG_NAME, &md_coll_read) < 0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "can't get core collective metadata read flag")

            /* If collective metadata read requested, set collective metadata read flag */
            if (H5P_USER_TRUE == md_coll_read)
                is_collective = TRUE;
        } /* end if */
#endif    /* H5_HAVE_PARALLEL */
    }     /* end else */

#ifdef H5_HAVE_PARALLEL
    /* Check for collective operation */
    if (is_collective) {
        /* Set collective metadata read flag */
        (*head)->ctx.coll_metadata_read = TRUE;

        /* If parallel is enabled and the file driver used is the MPI-IO
         * VFD, issue an MPI barrier for easier debugging if the API function
         * calling this is supposed to be called collectively.
         */
        if (H5_coll_api_sanity_check_g) {
            MPI_Comm mpi_comm; /* File communicator */

            /* Retrieve the MPI communicator from the loc_id or the fapl_id */
            if (H5F_mpi_retrieve_comm(loc_id, *acspl_id, &mpi_comm) < 0)
                HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't get MPI communicator")

            /* issue the barrier */
            if (mpi_comm != MPI_COMM_NULL)
                MPI_Barrier(mpi_comm);
        } /* end if */
    }     /* end if */
#endif    /* H5_HAVE_PARALLEL */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_apl() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_loc
 *
 * Purpose:     Sanity checks and sets up collective operations.
 *
 * Note:        Should be called for all API routines that modify file
 *              metadata but don't pass in an access property list.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_loc(hid_t
#ifndef H5_HAVE_PARALLEL
                 H5_ATTR_UNUSED
#endif /* H5_HAVE_PARALLEL */
                     loc_id)
{
#ifdef H5_HAVE_PARALLEL
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set collective metadata read flag */
    (*head)->ctx.coll_metadata_read = TRUE;

    /* If parallel is enabled and the file driver used is the MPI-IO
     * VFD, issue an MPI barrier for easier debugging if the API function
     * calling this is supposed to be called collectively.
     */
    if (H5_coll_api_sanity_check_g) {
        MPI_Comm mpi_comm; /* File communicator */

        /* Retrieve the MPI communicator from the loc_id or the fapl_id */
        if (H5F_mpi_retrieve_comm(loc_id, H5P_DEFAULT, &mpi_comm) < 0)
            HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't get MPI communicator")

        /* issue the barrier */
        if (mpi_comm != MPI_COMM_NULL)
            MPI_Barrier(mpi_comm);
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
#else  /* H5_HAVE_PARALLEL */
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    FUNC_LEAVE_NOAPI(SUCCEED)
#endif /* H5_HAVE_PARALLEL */
} /* end H5CX_set_loc() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_vol_wrap_ctx
 *
 * Purpose:     Sets the VOL object wrapping context for an operation.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_vol_wrap_ctx(void *vol_wrap_ctx)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context value */
    (*head)->ctx.vol_wrap_ctx = vol_wrap_ctx;

    /* Mark the value as valid */
    (*head)->ctx.vol_wrap_ctx_valid = TRUE;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_vol_wrap_ctx() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_vol_connector_prop
 *
 * Purpose:     Sets the VOL connector ID & info for an operation.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_vol_connector_prop(const H5VL_connector_prop_t *vol_connector_prop)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context value */
    H5MM_memcpy(&(*head)->ctx.vol_connector_prop, vol_connector_prop, sizeof(H5VL_connector_prop_t));

    /* Mark the value as valid */
    (*head)->ctx.vol_connector_prop_valid = TRUE;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_vol_connector_prop() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_dxpl
 *
 * Purpose:     Retrieves the DXPL ID for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5CX_get_dxpl(void)
{
    H5CX_node_t **head    = NULL;            /* Pointer to head of API context list */
    hid_t         dxpl_id = H5I_INVALID_HID; /* DXPL ID for API operation */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set return value */
    dxpl_id = (*head)->ctx.dxpl_id;

    FUNC_LEAVE_NOAPI(dxpl_id)
} /* end H5CX_get_dxpl() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_lapl
 *
 * Purpose:     Retrieves the LAPL ID for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5CX_get_lapl(void)
{
    H5CX_node_t **head    = NULL;            /* Pointer to head of API context list */
    hid_t         lapl_id = H5I_INVALID_HID; /* LAPL ID for API operation */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set return value */
    lapl_id = (*head)->ctx.lapl_id;

    FUNC_LEAVE_NOAPI(lapl_id)
} /* end H5CX_get_lapl() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_vol_wrap_ctx
 *
 * Purpose:     Retrieves the VOL object wrapping context for an operation.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_vol_wrap_ctx(void **vol_wrap_ctx)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(vol_wrap_ctx);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */

    /* No error is expected at this point.  But in case an application calls H5VLwrap_register
     * which doesn't reset the API context and there is no context, returns a relevant error here
     */
    if (!head)
        HGOTO_ERROR(H5E_CONTEXT, H5E_UNINITIALIZED, FAIL, "the API context isn't available")

    if (!(*head))
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "unable to get the current API context")

    /* Check for value that was set */
    if ((*head)->ctx.vol_wrap_ctx_valid)
        /* Get the value */
        *vol_wrap_ctx = (*head)->ctx.vol_wrap_ctx;
    else
        *vol_wrap_ctx = NULL;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_vol_wrap_ctx() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_vol_connector_prop
 *
 * Purpose:     Retrieves the VOL connector ID & info for an operation.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_vol_connector_prop(H5VL_connector_prop_t *vol_connector_prop)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    assert(vol_connector_prop);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Check for value that was set */
    if ((*head)->ctx.vol_connector_prop_valid)
        /* Get the value */
        H5MM_memcpy(vol_connector_prop, &(*head)->ctx.vol_connector_prop, sizeof(H5VL_connector_prop_t));
    else
        memset(vol_connector_prop, 0, sizeof(H5VL_connector_prop_t));

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_vol_connector_prop() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_tag
 *
 * Purpose:     Retrieves the object tag for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
haddr_t
H5CX_get_tag(void)
{
    H5CX_node_t **head = NULL;        /* Pointer to head of API context list */
    haddr_t       tag  = HADDR_UNDEF; /* Current object's tag (ohdr chunk #0 address) */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set return value */
    tag = (*head)->ctx.tag;

    FUNC_LEAVE_NOAPI(tag)
} /* end H5CX_get_tag() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_ring
 *
 * Purpose:     Retrieves the metadata cache ring for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
H5AC_ring_t
H5CX_get_ring(void)
{
    H5CX_node_t **head = NULL;          /* Pointer to head of API context list */
    H5AC_ring_t   ring = H5AC_RING_INV; /* Current metadata cache ring for entries */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set return value */
    ring = (*head)->ctx.ring;

    FUNC_LEAVE_NOAPI(ring)
} /* end H5CX_get_ring() */

#ifdef H5_HAVE_PARALLEL

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_coll_metadata_read
 *
 * Purpose:     Retrieves the "do collective metadata reads" flag for the current API call context.
 *
 * Return:      TRUE / FALSE on success / <can't fail>
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5CX_get_coll_metadata_read(void)
{
    H5CX_node_t **head         = NULL; /* Pointer to head of API context list */
    hbool_t       coll_md_read = FALSE;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set return value */
    coll_md_read = (*head)->ctx.coll_metadata_read;

    FUNC_LEAVE_NOAPI(coll_md_read)
} /* end H5CX_get_coll_metadata_read() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpi_coll_datatypes
 *
 * Purpose:     Retrieves the MPI datatypes for collective I/O for the current API call context.
 *
 * Note:	This is only a shallow copy, the datatypes are not duplicated.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_mpi_coll_datatypes(MPI_Datatype *btype, MPI_Datatype *ftype)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    assert(btype);
    assert(ftype);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context values */
    *btype = (*head)->ctx.btype;
    *ftype = (*head)->ctx.ftype;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_mpi_coll_datatypes() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpi_file_flushing
 *
 * Purpose:     Retrieves the "flushing an MPI-opened file" flag for the current API call context.
 *
 * Return:      TRUE / FALSE on success / <can't fail>
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5CX_get_mpi_file_flushing(void)
{
    H5CX_node_t **head     = NULL; /* Pointer to head of API context list */
    hbool_t       flushing = FALSE;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set return value */
    flushing = (*head)->ctx.mpi_file_flushing;

    FUNC_LEAVE_NOAPI(flushing)
} /* end H5CX_get_mpi_file_flushing() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpio_rank0_bcast
 *
 * Purpose:     Retrieves if the dataset meets read-with-rank0-and-bcast requirements for the current API call
 *context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5CX_get_mpio_rank0_bcast(void)
{
    H5CX_node_t **head           = NULL; /* Pointer to head of API context list */
    hbool_t       do_rank0_bcast = FALSE;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set return value */
    do_rank0_bcast = (*head)->ctx.rank0_bcast;

    FUNC_LEAVE_NOAPI(do_rank0_bcast)
} /* end H5CX_get_mpio_rank0_bcast() */
#endif /* H5_HAVE_PARALLEL */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_btree_split_ratios
 *
 * Purpose:     Retrieves the B-tree split ratios for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_btree_split_ratios(double split_ratio[3])
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(split_ratio);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_BTREE_SPLIT_RATIO_NAME,
                             btree_split_ratio)

    /* Get the B-tree split ratio values */
    H5MM_memcpy(split_ratio, &(*head)->ctx.btree_split_ratio, sizeof((*head)->ctx.btree_split_ratio));

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_btree_split_ratios() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_max_temp_buf
 *
 * Purpose:     Retrieves the maximum temporary buffer size for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_max_temp_buf(size_t *max_temp_buf)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(max_temp_buf);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_MAX_TEMP_BUF_NAME, max_temp_buf)

    /* Get the value */
    *max_temp_buf = (*head)->ctx.max_temp_buf;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_max_temp_buf() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_tconv_buf
 *
 * Purpose:     Retrieves the temporary buffer pointer for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_tconv_buf(void **tconv_buf)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(tconv_buf);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_TCONV_BUF_NAME, tconv_buf)

    /* Get the value */
    *tconv_buf = (*head)->ctx.tconv_buf;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_tconv_buf() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_bkgr_buf
 *
 * Purpose:     Retrieves the background buffer pointer for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_bkgr_buf(void **bkgr_buf)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(bkgr_buf);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_BKGR_BUF_NAME, bkgr_buf)

    /* Get the value */
    *bkgr_buf = (*head)->ctx.bkgr_buf;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_bkgr_buf() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_bkgr_buf_type
 *
 * Purpose:     Retrieves the background buffer type for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_bkgr_buf_type(H5T_bkg_t *bkgr_buf_type)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(bkgr_buf_type);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_BKGR_BUF_TYPE_NAME, bkgr_buf_type)

    /* Get the value */
    *bkgr_buf_type = (*head)->ctx.bkgr_buf_type;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_bkgr_buf_type() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_vec_size
 *
 * Purpose:     Retrieves the hyperslab vector size for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_vec_size(size_t *vec_size)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(vec_size);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_HYPER_VECTOR_SIZE_NAME, vec_size)

    /* Get the value */
    *vec_size = (*head)->ctx.vec_size;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_vec_size() */

#ifdef H5_HAVE_PARALLEL

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_io_xfer_mode
 *
 * Purpose:     Retrieves the parallel transfer mode for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_io_xfer_mode(H5FD_mpio_xfer_t *io_xfer_mode)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(io_xfer_mode);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_IO_XFER_MODE_NAME, io_xfer_mode)

    /* Get the value */
    *io_xfer_mode = (*head)->ctx.io_xfer_mode;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_io_xfer_mode() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpio_coll_opt
 *
 * Purpose:     Retrieves the collective / independent parallel I/O option for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_mpio_coll_opt(H5FD_mpio_collective_opt_t *mpio_coll_opt)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(mpio_coll_opt);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_MPIO_COLLECTIVE_OPT_NAME, mpio_coll_opt)

    /* Get the value */
    *mpio_coll_opt = (*head)->ctx.mpio_coll_opt;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_mpio_coll_opt() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpio_local_no_coll_cause
 *
 * Purpose:     Retrieves the local cause for breaking collective I/O for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_mpio_local_no_coll_cause(uint32_t *mpio_local_no_coll_cause)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(mpio_local_no_coll_cause);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID_SET(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_MPIO_LOCAL_NO_COLLECTIVE_CAUSE_NAME,
                                 mpio_local_no_coll_cause)

    /* Get the value */
    *mpio_local_no_coll_cause = (*head)->ctx.mpio_local_no_coll_cause;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_mpio_local_no_coll_cause() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpio_global_no_coll_cause
 *
 * Purpose:     Retrieves the global cause for breaking collective I/O for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_mpio_global_no_coll_cause(uint32_t *mpio_global_no_coll_cause)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(mpio_global_no_coll_cause);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID_SET(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_MPIO_GLOBAL_NO_COLLECTIVE_CAUSE_NAME,
                                 mpio_global_no_coll_cause)

    /* Get the value */
    *mpio_global_no_coll_cause = (*head)->ctx.mpio_global_no_coll_cause;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_mpio_global_no_coll_cause() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpio_chunk_opt_mode
 *
 * Purpose:     Retrieves the collective chunk optimization mode for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_mpio_chunk_opt_mode(H5FD_mpio_chunk_opt_t *mpio_chunk_opt_mode)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(mpio_chunk_opt_mode);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_MPIO_CHUNK_OPT_HARD_NAME,
                             mpio_chunk_opt_mode)

    /* Get the value */
    *mpio_chunk_opt_mode = (*head)->ctx.mpio_chunk_opt_mode;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_mpio_chunk_opt_mode() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpio_chunk_opt_num
 *
 * Purpose:     Retrieves the collective chunk optimization threshold for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_mpio_chunk_opt_num(unsigned *mpio_chunk_opt_num)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(mpio_chunk_opt_num);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_MPIO_CHUNK_OPT_NUM_NAME,
                             mpio_chunk_opt_num)

    /* Get the value */
    *mpio_chunk_opt_num = (*head)->ctx.mpio_chunk_opt_num;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_mpio_chunk_opt_num() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_mpio_chunk_opt_ratio
 *
 * Purpose:     Retrieves the collective chunk optimization ratio for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_mpio_chunk_opt_ratio(unsigned *mpio_chunk_opt_ratio)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(mpio_chunk_opt_ratio);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_MPIO_CHUNK_OPT_RATIO_NAME,
                             mpio_chunk_opt_ratio)

    /* Get the value */
    *mpio_chunk_opt_ratio = (*head)->ctx.mpio_chunk_opt_ratio;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_mpio_chunk_opt_ratio() */
#endif /* H5_HAVE_PARALLEL */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_err_detect
 *
 * Purpose:     Retrieves the error detection info for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_err_detect(H5Z_EDC_t *err_detect)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(err_detect);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_EDC_NAME, err_detect)

    /* Get the value */
    *err_detect = (*head)->ctx.err_detect;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_err_detect() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_filter_cb
 *
 * Purpose:     Retrieves the I/O filter callback function for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_filter_cb(H5Z_cb_t *filter_cb)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(filter_cb);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_FILTER_CB_NAME, filter_cb)

    /* Get the value */
    *filter_cb = (*head)->ctx.filter_cb;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_filter_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_data_transform
 *
 * Purpose:     Retrieves the I/O filter callback function for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_data_transform(H5Z_data_xform_t **data_transform)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(data_transform);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    /* Check if the value has been retrieved already */
    if (!(*head)->ctx.data_transform_valid) {
        /* Check for default DXPL */
        if ((*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT)
            (*head)->ctx.data_transform = H5CX_def_dxpl_cache.data_transform;
        else {
            /* Check if the property list is already available */
            if (NULL == (*head)->ctx.dxpl)
                /* Get the dataset transfer property list pointer */
                if (NULL == ((*head)->ctx.dxpl = (H5P_genplist_t *)H5I_object((*head)->ctx.dxpl_id)))
                    HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL,
                                "can't get default dataset transfer property list")

            /* Get data transform info value */
            /* (Note: 'peek', not 'get' - if this turns out to be a problem, we may need
             *          to copy it and free this in the H5CX pop routine. -QAK)
             */
            if (H5P_peek((*head)->ctx.dxpl, H5D_XFER_XFORM_NAME, &(*head)->ctx.data_transform) < 0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve data transform info")
        } /* end else */

        /* Mark the value as valid */
        (*head)->ctx.data_transform_valid = TRUE;
    } /* end if */

    /* Get the value */
    *data_transform = (*head)->ctx.data_transform;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_data_transform() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_vlen_alloc_info
 *
 * Purpose:     Retrieves the VL datatype alloc info for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_vlen_alloc_info(H5T_vlen_alloc_info_t *vl_alloc_info)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(vl_alloc_info);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    /* Check if the value has been retrieved already */
    if (!(*head)->ctx.vl_alloc_info_valid) {
        /* Check for default DXPL */
        if ((*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT)
            (*head)->ctx.vl_alloc_info = H5CX_def_dxpl_cache.vl_alloc_info;
        else {
            /* Check if the property list is already available */
            if (NULL == (*head)->ctx.dxpl)
                /* Get the dataset transfer property list pointer */
                if (NULL == ((*head)->ctx.dxpl = (H5P_genplist_t *)H5I_object((*head)->ctx.dxpl_id)))
                    HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL,
                                "can't get default dataset transfer property list")

            /* Get VL datatype alloc info values */
            if (H5P_get((*head)->ctx.dxpl, H5D_XFER_VLEN_ALLOC_NAME, &(*head)->ctx.vl_alloc_info.alloc_func) <
                0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VL datatype alloc info")
            if (H5P_get((*head)->ctx.dxpl, H5D_XFER_VLEN_ALLOC_INFO_NAME,
                        &(*head)->ctx.vl_alloc_info.alloc_info) < 0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VL datatype alloc info")
            if (H5P_get((*head)->ctx.dxpl, H5D_XFER_VLEN_FREE_NAME, &(*head)->ctx.vl_alloc_info.free_func) <
                0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VL datatype alloc info")
            if (H5P_get((*head)->ctx.dxpl, H5D_XFER_VLEN_FREE_INFO_NAME,
                        &(*head)->ctx.vl_alloc_info.free_info) < 0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VL datatype alloc info")
        } /* end else */

        /* Mark the value as valid */
        (*head)->ctx.vl_alloc_info_valid = TRUE;
    } /* end if */

    /* Get the value */
    *vl_alloc_info = (*head)->ctx.vl_alloc_info;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_vlen_alloc_info() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_dt_conv_cb
 *
 * Purpose:     Retrieves the datatype conversion exception callback for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_dt_conv_cb(H5T_conv_cb_t *dt_conv_cb)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(dt_conv_cb);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_CONV_CB_NAME, dt_conv_cb)

    /* Get the value */
    *dt_conv_cb = (*head)->ctx.dt_conv_cb;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_dt_conv_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_selection_io_mode
 *
 * Purpose:     Retrieves the selection I/O mode for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_selection_io_mode(H5D_selection_io_mode_t *selection_io_mode)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(selection_io_mode);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_SELECTION_IO_MODE_NAME,
                             selection_io_mode)

    /* Get the value */
    *selection_io_mode = (*head)->ctx.selection_io_mode;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_selection_io_mode() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_no_selection_io_cause
 *
 * Purpose:     Retrieves the cause for not performing selection I/O
 *              for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_no_selection_io_cause(uint32_t *no_selection_io_cause)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(no_selection_io_cause);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID_SET(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_NO_SELECTION_IO_CAUSE_NAME,
                                 no_selection_io_cause)

    /* Get the value */
    *no_selection_io_cause = (*head)->ctx.no_selection_io_cause;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_no_selection_io_cause() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_modify_write_buf
 *
 * Purpose:     Retrieves the modify write buffer property for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_modify_write_buf(hbool_t *modify_write_buf)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(modify_write_buf);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(dxpl, H5P_DATASET_XFER_DEFAULT, H5D_XFER_MODIFY_WRITE_BUF_NAME, modify_write_buf)

    /* Get the value */
    *modify_write_buf = (*head)->ctx.modify_write_buf;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_selection_io_mode() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_encoding
 *
 * Purpose:     Retrieves the character encoding for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_encoding(H5T_cset_t *encoding)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(encoding);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.lcpl_id);

    H5CX_RETRIEVE_PROP_VALID(lcpl, H5P_LINK_CREATE_DEFAULT, H5P_STRCRT_CHAR_ENCODING_NAME, encoding)

    /* Get the value */
    *encoding = (*head)->ctx.encoding;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_encoding() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_intermediate_group
 *
 * Purpose:     Retrieves the create intermediate group flag for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_intermediate_group(unsigned *crt_intermed_group)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(crt_intermed_group);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.lcpl_id);

    H5CX_RETRIEVE_PROP_VALID(lcpl, H5P_LINK_CREATE_DEFAULT, H5L_CRT_INTERMEDIATE_GROUP_NAME,
                             intermediate_group)

    /* Get the value */
    *crt_intermed_group = (*head)->ctx.intermediate_group;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_create_intermediate_group() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_nlinks
 *
 * Purpose:     Retrieves the # of soft / UD links to traverse for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_nlinks(size_t *nlinks)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(nlinks);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dxpl_id);

    H5CX_RETRIEVE_PROP_VALID(lapl, H5P_LINK_ACCESS_DEFAULT, H5L_ACS_NLINKS_NAME, nlinks)

    /* Get the value */
    *nlinks = (*head)->ctx.nlinks;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_nlinks() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_libver_bounds
 *
 * Purpose:     Retrieves the low/high bounds for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_libver_bounds(H5F_libver_t *low_bound, H5F_libver_t *high_bound)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(low_bound);
    assert(high_bound);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.fapl_id);

    H5CX_RETRIEVE_PROP_VALID(fapl, H5P_FILE_ACCESS_DEFAULT, H5F_ACS_LIBVER_LOW_BOUND_NAME, low_bound)
    H5CX_RETRIEVE_PROP_VALID(fapl, H5P_FILE_ACCESS_DEFAULT, H5F_ACS_LIBVER_HIGH_BOUND_NAME, high_bound)

    /* Get the values */
    *low_bound  = (*head)->ctx.low_bound;
    *high_bound = (*head)->ctx.high_bound;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_libver_bounds() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_dset_min_ohdr_flag
 *
 * Purpose:     Retrieves the flag that indicates whether the dataset object
 *		header should be minimized
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_dset_min_ohdr_flag(hbool_t *dset_min_ohdr_flag)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(dset_min_ohdr_flag);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dcpl_id);

    H5CX_RETRIEVE_PROP_VALID(dcpl, H5P_DATASET_CREATE_DEFAULT, H5D_CRT_MIN_DSET_HDR_SIZE_NAME,
                             do_min_dset_ohdr)

    /* Get the value */
    *dset_min_ohdr_flag = (*head)->ctx.do_min_dset_ohdr;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_dset_min_ohdr_flag() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_ext_file_prefix
 *
 * Purpose:     Retrieves the prefix for external file
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_ext_file_prefix(const char **extfile_prefix)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(extfile_prefix);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dapl_id);

    /* Check if the value has been retrieved already */
    if (!(*head)->ctx.extfile_prefix_valid) {
        /* Check for default DAPL */
        if ((*head)->ctx.dapl_id == H5P_DATASET_ACCESS_DEFAULT)
            (*head)->ctx.extfile_prefix = H5CX_def_dapl_cache.extfile_prefix;
        else {
            /* Check if the property list is already available */
            if (NULL == (*head)->ctx.dapl)
                /* Get the dataset access property list pointer */
                if (NULL == ((*head)->ctx.dapl = (H5P_genplist_t *)H5I_object((*head)->ctx.dapl_id)))
                    HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL,
                                "can't get default dataset access property list")

            /* Get the prefix for the external file */
            /* (Note: 'peek', not 'get' - if this turns out to be a problem, we may need
             *          to copy it and free this in the H5CX pop routine. -QAK)
             */
            if (H5P_peek((*head)->ctx.dapl, H5D_ACS_EFILE_PREFIX_NAME, &(*head)->ctx.extfile_prefix) < 0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve external file prefix")
        } /* end else */

        /* Mark the value as valid */
        (*head)->ctx.extfile_prefix_valid = TRUE;
    } /* end if */

    /* Get the value */
    *extfile_prefix = (*head)->ctx.extfile_prefix;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_ext_file_prefix() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_vds_prefix
 *
 * Purpose:     Retrieves the prefix for VDS
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_vds_prefix(const char **vds_prefix)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(vds_prefix);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dapl_id);

    /* Check if the value has been retrieved already */
    if (!(*head)->ctx.vds_prefix_valid) {
        /* Check for default DAPL */
        if ((*head)->ctx.dapl_id == H5P_DATASET_ACCESS_DEFAULT)
            (*head)->ctx.vds_prefix = H5CX_def_dapl_cache.vds_prefix;
        else {
            /* Check if the property list is already available */
            if (NULL == (*head)->ctx.dapl)
                /* Get the dataset access property list pointer */
                if (NULL == ((*head)->ctx.dapl = (H5P_genplist_t *)H5I_object((*head)->ctx.dapl_id)))
                    HGOTO_ERROR(H5E_CONTEXT, H5E_BADTYPE, FAIL,
                                "can't get default dataset access property list")

            /* Get the prefix for the VDS */
            /* (Note: 'peek', not 'get' - if this turns out to be a problem, we may need
             *          to copy it and free this in the H5CX pop routine. -QAK)
             */
            if (H5P_peek((*head)->ctx.dapl, H5D_ACS_VDS_PREFIX_NAME, &(*head)->ctx.vds_prefix) < 0)
                HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "Can't retrieve VDS prefix")
        } /* end else */

        /* Mark the value as valid */
        (*head)->ctx.vds_prefix_valid = TRUE;
    } /* end if */

    /* Get the value */
    *vds_prefix = (*head)->ctx.vds_prefix;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_get_vds_prefix() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_tag
 *
 * Purpose:     Sets the object tag for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_tag(haddr_t tag)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    (*head)->ctx.tag = tag;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_tag() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_ring
 *
 * Purpose:     Sets the metadata cache ring for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_ring(H5AC_ring_t ring)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    (*head)->ctx.ring = ring;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_ring() */

#ifdef H5_HAVE_PARALLEL

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_coll_metadata_read
 *
 * Purpose:     Sets the "do collective metadata reads" flag for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_coll_metadata_read(hbool_t cmdr)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    (*head)->ctx.coll_metadata_read = cmdr;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_coll_metadata_read() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_mpi_coll_datatypes
 *
 * Purpose:     Sets the MPI datatypes for collective I/O for the current API call context.
 *
 * Note:	This is only a shallow copy, the datatypes are not duplicated.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_mpi_coll_datatypes(MPI_Datatype btype, MPI_Datatype ftype)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context values */
    (*head)->ctx.btype = btype;
    (*head)->ctx.ftype = ftype;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_mpi_coll_datatypes() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_io_xfer_mode
 *
 * Purpose:     Sets the parallel transfer mode for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_io_xfer_mode(H5FD_mpio_xfer_t io_xfer_mode)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context value */
    (*head)->ctx.io_xfer_mode = io_xfer_mode;

    /* Mark the value as valid */
    (*head)->ctx.io_xfer_mode_valid = TRUE;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_io_xfer_mode() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_mpio_coll_opt
 *
 * Purpose:     Sets the parallel transfer mode for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_mpio_coll_opt(H5FD_mpio_collective_opt_t mpio_coll_opt)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context value */
    (*head)->ctx.mpio_coll_opt = mpio_coll_opt;

    /* Mark the value as valid */
    (*head)->ctx.mpio_coll_opt_valid = TRUE;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_mpio_coll_opt() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_mpi_file_flushing
 *
 * Purpose:     Sets the "flushing an MPI-opened file" flag for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_mpi_file_flushing(hbool_t flushing)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    (*head)->ctx.mpi_file_flushing = flushing;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_mpi_file_flushing() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_mpio_rank0_bcast
 *
 * Purpose:     Sets the "dataset meets read-with-rank0-and-bcast requirements" flag for the current API call
 *context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_mpio_rank0_bcast(hbool_t rank0_bcast)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    (*head)->ctx.rank0_bcast = rank0_bcast;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_mpio_rank0_bcast() */
#endif /* H5_HAVE_PARALLEL */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_vlen_alloc_info
 *
 * Purpose:     Sets the VL datatype alloc info for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_vlen_alloc_info(H5MM_allocate_t alloc_func, void *alloc_info, H5MM_free_t free_func, void *free_info)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context value */
    (*head)->ctx.vl_alloc_info.alloc_func = alloc_func;
    (*head)->ctx.vl_alloc_info.alloc_info = alloc_info;
    (*head)->ctx.vl_alloc_info.free_func  = free_func;
    (*head)->ctx.vl_alloc_info.free_info  = free_info;

    /* Mark the value as valid */
    (*head)->ctx.vl_alloc_info_valid = TRUE;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_vlen_alloc_info() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_nlinks
 *
 * Purpose:     Sets the # of soft / UD links to traverse for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_set_nlinks(size_t nlinks)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Set the API context value */
    (*head)->ctx.nlinks = nlinks;

    /* Mark the value as valid */
    (*head)->ctx.nlinks_valid = TRUE;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_set_nlinks() */

#ifdef H5_HAVE_PARALLEL

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_mpio_actual_chunk_opt
 *
 * Purpose:     Sets the actual chunk optimization used for parallel I/O for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_mpio_actual_chunk_opt(H5D_mpio_actual_chunk_opt_mode_t mpio_actual_chunk_opt)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    /* Cache the value for later, marking it to set in DXPL when context popped */
    (*head)->ctx.mpio_actual_chunk_opt     = mpio_actual_chunk_opt;
    (*head)->ctx.mpio_actual_chunk_opt_set = TRUE;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_mpio_actual_chunk_opt() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_mpio_actual_io_mode
 *
 * Purpose:     Sets the actual I/O mode used for parallel I/O for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_mpio_actual_io_mode(H5D_mpio_actual_io_mode_t mpio_actual_io_mode)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    /* Cache the value for later, marking it to set in DXPL when context popped */
    (*head)->ctx.mpio_actual_io_mode     = mpio_actual_io_mode;
    (*head)->ctx.mpio_actual_io_mode_set = TRUE;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_mpio_actual_chunk_opt() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_mpio_local_no_coll_cause
 *
 * Purpose:     Sets the local reason for breaking collective I/O for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_mpio_local_no_coll_cause(uint32_t mpio_local_no_coll_cause)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert((*head)->ctx.dxpl_id != H5P_DEFAULT);

    /* If we're using the default DXPL, don't modify it */
    if ((*head)->ctx.dxpl_id != H5P_DATASET_XFER_DEFAULT) {
        /* Cache the value for later, marking it to set in DXPL when context popped */
        (*head)->ctx.mpio_local_no_coll_cause     = mpio_local_no_coll_cause;
        (*head)->ctx.mpio_local_no_coll_cause_set = TRUE;
    } /* end if */

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_mpio_local_no_coll_cause() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_mpio_global_no_coll_cause
 *
 * Purpose:     Sets the global reason for breaking collective I/O for the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_mpio_global_no_coll_cause(uint32_t mpio_global_no_coll_cause)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert((*head)->ctx.dxpl_id != H5P_DEFAULT);

    /* If we're using the default DXPL, don't modify it */
    if ((*head)->ctx.dxpl_id != H5P_DATASET_XFER_DEFAULT) {
        /* Cache the value for later, marking it to set in DXPL when context popped */
        (*head)->ctx.mpio_global_no_coll_cause     = mpio_global_no_coll_cause;
        (*head)->ctx.mpio_global_no_coll_cause_set = TRUE;
    } /* end if */

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_mpio_global_no_coll_cause() */

#ifdef H5_HAVE_INSTRUMENTED_LIBRARY

/*-------------------------------------------------------------------------
 * Function:    H5CX_test_set_mpio_coll_chunk_link_hard
 *
 * Purpose:     Sets the instrumented "collective chunk link hard" value for the current API call context.
 *
 * Note:        Only sets value if property set in DXPL
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_test_set_mpio_coll_chunk_link_hard(int mpio_coll_chunk_link_hard)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    H5CX_TEST_SET_PROP(H5D_XFER_COLL_CHUNK_LINK_HARD_NAME, mpio_coll_chunk_link_hard)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_test_set_mpio_coll_chunk_link_hard() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_test_set_mpio_coll_chunk_multi_hard
 *
 * Purpose:     Sets the instrumented "collective chunk multi hard" value for the current API call context.
 *
 * Note:        Only sets value if property set in DXPL
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_test_set_mpio_coll_chunk_multi_hard(int mpio_coll_chunk_multi_hard)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    H5CX_TEST_SET_PROP(H5D_XFER_COLL_CHUNK_MULTI_HARD_NAME, mpio_coll_chunk_multi_hard)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_test_set_mpio_coll_chunk_multi_hard() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_test_set_mpio_coll_chunk_link_num_true
 *
 * Purpose:     Sets the instrumented "collective chunk link num tru" value for the current API call context.
 *
 * Note:        Only sets value if property set in DXPL
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_test_set_mpio_coll_chunk_link_num_true(int mpio_coll_chunk_link_num_true)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    H5CX_TEST_SET_PROP(H5D_XFER_COLL_CHUNK_LINK_NUM_TRUE_NAME, mpio_coll_chunk_link_num_true)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_test_set_mpio_coll_chunk_link_num_true() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_test_set_mpio_coll_chunk_link_num_false
 *
 * Purpose:     Sets the instrumented "collective chunk link num false" value for the current API call
 *context.
 *
 * Note:        Only sets value if property set in DXPL
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_test_set_mpio_coll_chunk_link_num_false(int mpio_coll_chunk_link_num_false)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    H5CX_TEST_SET_PROP(H5D_XFER_COLL_CHUNK_LINK_NUM_FALSE_NAME, mpio_coll_chunk_link_num_false)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_test_set_mpio_coll_chunk_link_num_false() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_test_set_mpio_coll_chunk_multi_ratio_coll
 *
 * Purpose:     Sets the instrumented "collective chunk multi ratio coll" value for the current API call
 *context.
 *
 * Note:        Only sets value if property set in DXPL
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_test_set_mpio_coll_chunk_multi_ratio_coll(int mpio_coll_chunk_multi_ratio_coll)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    H5CX_TEST_SET_PROP(H5D_XFER_COLL_CHUNK_MULTI_RATIO_COLL_NAME, mpio_coll_chunk_multi_ratio_coll)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_test_set_mpio_coll_chunk_multi_ratio_coll() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_test_set_mpio_coll_chunk_multi_ratio_ind
 *
 * Purpose:     Sets the instrumented "collective chunk multi ratio ind" value for the current API call
 *context.
 *
 * Note:        Only sets value if property set in DXPL
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_test_set_mpio_coll_chunk_multi_ratio_ind(int mpio_coll_chunk_multi_ratio_ind)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    H5CX_TEST_SET_PROP(H5D_XFER_COLL_CHUNK_MULTI_RATIO_IND_NAME, mpio_coll_chunk_multi_ratio_ind)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_test_set_mpio_coll_chunk_multi_ratio_ind() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_test_set_mpio_coll_rank0_bcast
 *
 * Purpose:     Sets the instrumented "read-with-rank0-bcast" flag for the current API call context.
 *
 * Note:        Only sets value if property set in DXPL
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_test_set_mpio_coll_rank0_bcast(hbool_t mpio_coll_rank0_bcast)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));

    H5CX_TEST_SET_PROP(H5D_XFER_COLL_RANK0_BCAST_NAME, mpio_coll_rank0_bcast)

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_test_set_mpio_coll_rank0_bcast() */
#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
#endif /* H5_HAVE_PARALLEL */

/*-------------------------------------------------------------------------
 * Function:    H5CX_set_no_selecction_io_cause
 *
 * Purpose:     Sets the reason for not performing selection I/O for
 *              the current API call context.
 *
 * Return:      <none>
 *
 *-------------------------------------------------------------------------
 */
void
H5CX_set_no_selection_io_cause(uint32_t no_selection_io_cause)
{
    H5CX_node_t **head = NULL; /* Pointer to head of API context list */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert((*head)->ctx.dxpl_id != H5P_DEFAULT);

    /* If we're using the default DXPL, don't modify it */
    if ((*head)->ctx.dxpl_id != H5P_DATASET_XFER_DEFAULT) {
        /* Cache the value for later, marking it to set in DXPL when context popped */
        (*head)->ctx.no_selection_io_cause     = no_selection_io_cause;
        (*head)->ctx.no_selection_io_cause_set = TRUE;
    } /* end if */

    FUNC_LEAVE_NOAPI_VOID
} /* end H5CX_set_no_selectiion_io_cause() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_get_ohdr_flags
 *
 * Purpose:     Retrieves the object header flags for the current API call context.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_get_ohdr_flags(uint8_t *ohdr_flags)
{
    H5CX_node_t **head      = NULL;    /* Pointer to head of API context list */
    herr_t        ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(ohdr_flags);
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);
    assert(H5P_DEFAULT != (*head)->ctx.dcpl_id);

    H5CX_RETRIEVE_PROP_VALID(dcpl, H5P_DATASET_CREATE_DEFAULT, H5O_CRT_OHDR_FLAGS_NAME, ohdr_flags)

    /* Get the value */
    *ohdr_flags = (*head)->ctx.ohdr_flags;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* End H5CX_get_ohdr_flags() */

/*-------------------------------------------------------------------------
 * Function:    H5CX__pop_common
 *
 * Purpose:     Common code for popping the context for an API call.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
static H5CX_node_t *
H5CX__pop_common(hbool_t update_dxpl_props)
{
    H5CX_node_t **head      = NULL; /* Pointer to head of API context list */
    H5CX_node_t  *ret_value = NULL; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    head = H5CX_get_my_context(); /* Get the pointer to the head of the API context, for this thread */
    assert(head && *head);

    /* Check for cached DXPL properties to return to application */
    if (update_dxpl_props) {
        H5CX_SET_PROP(H5D_XFER_NO_SELECTION_IO_CAUSE_NAME, no_selection_io_cause)
#ifdef H5_HAVE_PARALLEL
        H5CX_SET_PROP(H5D_MPIO_ACTUAL_CHUNK_OPT_MODE_NAME, mpio_actual_chunk_opt)
        H5CX_SET_PROP(H5D_MPIO_ACTUAL_IO_MODE_NAME, mpio_actual_io_mode)
        H5CX_SET_PROP(H5D_MPIO_LOCAL_NO_COLLECTIVE_CAUSE_NAME, mpio_local_no_coll_cause)
        H5CX_SET_PROP(H5D_MPIO_GLOBAL_NO_COLLECTIVE_CAUSE_NAME, mpio_global_no_coll_cause)
#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
        H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_LINK_HARD_NAME, mpio_coll_chunk_link_hard)
        H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_MULTI_HARD_NAME, mpio_coll_chunk_multi_hard)
        H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_LINK_NUM_TRUE_NAME, mpio_coll_chunk_link_num_true)
        H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_LINK_NUM_FALSE_NAME, mpio_coll_chunk_link_num_false)
        H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_MULTI_RATIO_COLL_NAME, mpio_coll_chunk_multi_ratio_coll)
        H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_MULTI_RATIO_IND_NAME, mpio_coll_chunk_multi_ratio_ind)
        H5CX_SET_PROP(H5D_XFER_COLL_RANK0_BCAST_NAME, mpio_coll_rank0_bcast)
#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
#endif /* H5_HAVE_PARALLEL */
    }  /* end if */

    /* Pop the top context node from the stack */
    ret_value = (*head);
    (*head)   = (*head)->next;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX__pop_common() */

/*-------------------------------------------------------------------------
 * Function:    H5CX_pop
 *
 * Purpose:     Pops the context for an API call.
 *
 * Return:      Non-negative on success / Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5CX_pop(hbool_t update_dxpl_props)
{
    H5CX_node_t *cnode;               /* Context node */
    herr_t       ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Perform common operations and get top context from stack */
    if (NULL == (cnode = H5CX__pop_common(update_dxpl_props)))
        HGOTO_ERROR(H5E_CONTEXT, H5E_CANTGET, FAIL, "error getting API context node")

    /* Free the context node */
    cnode = H5FL_FREE(H5CX_node_t, cnode);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5CX_pop() */