From 340b4658a42567dfd5595721de349e7d5a55ed3a Mon Sep 17 00:00:00 2001
From: Neil Fortner <nfortne2@hdfgroup.org>
Date: Wed, 7 Dec 2016 14:02:53 -0600
Subject: Add new example for partial I/O write.

---
 examples/h5dsm_dset_wpartial.c | 141 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 examples/h5dsm_dset_wpartial.c

diff --git a/examples/h5dsm_dset_wpartial.c b/examples/h5dsm_dset_wpartial.c
new file mode 100644
index 0000000..22b8178
--- /dev/null
+++ b/examples/h5dsm_dset_wpartial.c
@@ -0,0 +1,141 @@
+#include "h5dsm_example.h"
+#include <time.h>
+#include <mpi.h>
+
+int main(int argc, char *argv[]) {
+    uuid_t pool_uuid;
+    char *pool_grp = "daos_tier0";
+    hid_t file = -1, dset = -1, file_space = -1, mem_space = -1, trans = -1, fapl = -1;
+    hsize_t dims[2] = {4, 6};
+    hsize_t start[2], count[2];
+    uint64_t trans_num;
+    int buf[4][6];
+    int rank, mpi_size;
+    char *file_sel_str[2] = {"XXX...", "...XXX");
+    int i, j;
+
+    (void)MPI_Init(&argc, &argv);
+    (void)daos_init();
+
+    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+    MPI_Comm_size(MPI_COMM_WORLD, &mpi_size);
+
+    if(mpi_size != 2)
+        PRINTF_ERROR("mpi_size != 2\n");
+
+    /* Seed random number generator */
+    srand(time(NULL));
+
+    if(argc != 4)
+        PRINTF_ERROR("argc != 4\n");
+
+    /* Parse UUID */
+    if(0 != uuid_parse(argv[1], pool_uuid))
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_daosm(fapl, MPI_COMM_WORLD, MPI_INFO_NULL, pool_uuid, pool_grp) < 0)
+        ERROR;
+
+    /* Open file */
+    if((file = H5Fopen_ff(argv[2], H5F_ACC_RDWR, fapl, &trans)) < 0)
+        ERROR;
+
+    /* Open dataset */
+    if((dset = H5Dopen_ff(file, argv[3], H5P_DEFAULT, trans)) < 0)
+        ERROR;
+
+    /* Get next transaction */
+    if(H5TRget_trans_num(trans, &trans_num) < 0)
+        ERROR;
+    if(H5TRclose(trans) < 0)
+        ERROR;
+    if((trans = H5TRcreate(file, trans_num + 1)) < 0)
+        ERROR;
+
+    if(rank == 1)
+        MPI_Barrier(MPI_COMM_WORLD);
+
+    printf("Rank %d:\n");
+    printf("Selecting elements denoted with X\n");
+    printf("Memory File\n");
+    printf("...... %s\n", file_sel_str[rank]);
+    for(i = 1; i < 4; i++)
+        printf(".XXXXX. %s\n", file_sel_str[rank]);
+
+    /* Fill and print buffer */
+    printf("Writing data. Buffer is:\n");
+    for(i = 0; i < 4; i++) {
+        for(j = 0; j < 6; j++) {
+            buf[i][j] = rand() % 10;
+            printf("%d ", buf[i][j]);
+        }
+        printf("\n");
+    }
+
+    if(rank == 0)
+        MPI_Barrier(MPI_COMM_WORLD);
+
+    /* Set up dataspaces */
+    if((file_space = H5Screate_simple(2, dims, NULL)) < 0)
+        ERROR;
+    if((mem_space = H5Screate_simple(2, dims, NULL)) < 0)
+        ERROR;
+    start[0] = 3 * rank;
+    start[1] = 0;
+    count[0] = 4;
+    count[1] = 3;
+    if(H5Sselect_hyperslab(file_space, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
+        ERROR;
+    start[0] = 1;
+    start[1] = 1;
+    count[0] = 3;
+    count[1] = 4;
+    if(H5Sselect_hyperslab(mem_space, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
+        ERROR;
+
+    /* Write data */
+    if(H5Dwrite_ff(dset, H5T_NATIVE_INT, mem_space, file_space, H5P_DEFAULT, buf, trans) < 0)
+        ERROR;
+
+    /* Commit transaction */
+    if(H5TRcommit(trans) < 0)
+        ERROR;
+
+    /* Close */
+    if(H5Dclose_ff(dset, -1) < 0)
+        ERROR;
+    if(H5TRclose(trans) < 0)
+        ERROR;
+    if(H5Fclose_ff(file, -1) < 0)
+        ERROR;
+    if(H5Sclose(file_space) < 0)
+        ERROR;
+    if(H5Sclose(mem_space) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)daos_fini();
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Dclose_ff(dset, -1);
+        H5TRclose(trans);
+        H5Fclose_ff(file, -1);
+        H5Sclose(file_space);
+        H5Sclose(mem_space);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)daos_fini();
+    (void)MPI_Finalize();
+    return 1;
+}
+
-- 
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