[svn-r9727] Purpose:

    Bug Fix/Code Cleanup/Doc Cleanup/Optimization/Branch Sync :-)

Description:
    Generally speaking, this is the "signed->unsigned" change to selections.
However, in the process of merging code back, things got stickier and stickier
until I ended up doing a big "sync the two branches up" operation.  So... I
brought back all the "infrastructure" fixes from the development branch to the
release branch (which I think were actually making some improvement in
performance) as well as fixed several bugs which had been fixed in one branch,
but not the other.

    I've also tagged the repository before making this checkin with the label
"before_signed_unsigned_changes".

Platforms tested:
    FreeBSD 4.10 (sleipnir) w/parallel & fphdf5
    FreeBSD 4.10 (sleipnir) w/threadsafe
    FreeBSD 4.10 (sleipnir) w/backward compatibility
    Solaris 2.7 (arabica) w/"purify options"
    Solaris 2.8 (sol) w/FORTRAN & C++
    AIX 5.x (copper) w/parallel & FORTRAN
    IRIX64 6.5 (modi4) w/FORTRAN
    Linux 2.4 (heping) w/FORTRAN & C++


Misc. update:

1 files changed, 58 insertions, 48 deletions

diff --git a/examples/h5_chunk_read.c b/examples/h5_chunk_read.c
index c6bf728..af87c10 100644
--- a/examples/h5_chunk_read.c
+++ b/examples/h5_chunk_read.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
@@ -39,7 +38,7 @@ main (void)
     hsize_t     chunk_dims[2];
     hsize_t     col_dims[1];
     hsize_t     count[2];
-    hssize_t    offset[2];
+    hsize_t     offset[2];
 
     herr_t      status, status_n;                             
 
@@ -68,24 +67,6 @@ main (void)
 	   rank, (unsigned long)(dims[0]), (unsigned long)(dims[1]));
 
     /*
-     * Get creation properties list.
-     */
-    cparms = H5Dget_create_plist(dataset); /* Get properties handle first. */
-
-    /* 
-     * Check if dataset is chunked.
-     */
-    if (H5D_CHUNKED == H5Pget_layout(cparms))  {
-
-	/*
-	 * Get chunking information: rank and dimensions
-	 */
-	rank_chunk = H5Pget_chunk(cparms, 2, chunk_dims);
-	printf("chunk rank %d, dimensions %lu x %lu\n", rank_chunk,
-	       (unsigned long)(chunk_dims[0]), (unsigned long)(chunk_dims[1]));
-    }
- 
-    /*
      * Define the memory space to read dataset.
      */
     memspace = H5Screate_simple(RANK,dims,NULL);
@@ -103,6 +84,11 @@ main (void)
     }     
 
     /*
+     * Close/release resources.
+     */
+    H5Sclose(memspace);
+
+    /*
      *	    dataset rank 2, dimensions 10 x 5 
      *	    chunk rank 2, dimensions 2 x 5 
 
@@ -145,6 +131,11 @@ main (void)
     }
 
     /*
+     * Close/release resources.
+     */
+    H5Sclose(memspace);
+
+    /*
      *	    Third column: 
      *	    1 
      *	    1 
@@ -159,36 +150,56 @@ main (void)
      */
 
     /*
-     * Define the memory space to read a chunk.
+     * Get creation properties list.
      */
-    memspace = H5Screate_simple(rank_chunk,chunk_dims,NULL);
+    cparms = H5Dget_create_plist(dataset); /* Get properties handle first. */
 
-    /*
-     * Define chunk in the file (hyperslab) to read.
-     */
-    offset[0] = 2;
-    offset[1] = 0;
-    count[0]  = chunk_dims[0];
-    count[1]  = chunk_dims[1];
-    status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL, 
-				 count, NULL);
+    if (H5D_CHUNKED == H5Pget_layout(cparms))  {
 
-    /*
-     * Read chunk back and display.
-     */
-    status = H5Dread(dataset, H5T_NATIVE_INT, memspace, filespace,
-		     H5P_DEFAULT, chunk_out);
-    printf("\n");
-    printf("Chunk: \n");
-    for (j = 0; j < chunk_dims[0]; j++) {
-	for (i = 0; i < chunk_dims[1]; i++) printf("%d ", chunk_out[j][i]);
-	printf("\n");
-    }     
-    /*
-     *	 Chunk: 
-     *	 1 1 1 0 0 
-     *	 2 0 0 0 0 
-     */
+	/*
+	 * Get chunking information: rank and dimensions
+	 */
+	rank_chunk = H5Pget_chunk(cparms, 2, chunk_dims);
+	printf("chunk rank %d, dimensions %lu x %lu\n", rank_chunk,
+	       (unsigned long)(chunk_dims[0]), (unsigned long)(chunk_dims[1]));
+
+        /*
+         * Define the memory space to read a chunk.
+         */
+        memspace = H5Screate_simple(rank_chunk,chunk_dims,NULL);
+
+        /*
+         * Define chunk in the file (hyperslab) to read.
+         */
+        offset[0] = 2;
+        offset[1] = 0;
+        count[0]  = chunk_dims[0];
+        count[1]  = chunk_dims[1];
+        status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL, 
+                                     count, NULL);
+
+        /*
+         * Read chunk back and display.
+         */
+        status = H5Dread(dataset, H5T_NATIVE_INT, memspace, filespace,
+                         H5P_DEFAULT, chunk_out);
+        printf("\n");
+        printf("Chunk: \n");
+        for (j = 0; j < chunk_dims[0]; j++) {
+            for (i = 0; i < chunk_dims[1]; i++) printf("%d ", chunk_out[j][i]);
+            printf("\n");
+        }     
+        /*
+         *	 Chunk: 
+         *	 1 1 1 0 0 
+         *	 2 0 0 0 0 
+         */
+
+        /*
+         * Close/release resources.
+         */
+        H5Sclose(memspace);
+    }
 
     /*
      * Close/release resources.
@@ -196,7 +207,6 @@ main (void)
     H5Pclose(cparms);
     H5Dclose(dataset);
     H5Sclose(filespace);
-    H5Sclose(memspace);
     H5Fclose(file);
 
     return 0;