[svn-r24087] Rename the private H5RC (reference count) module to H5UC (Use Count).

This is needed to avoid a conflict with the Read Context object to be
introduced in another Project.

No impact on users, since this is a private module, and low for
developers as the RC module use is very sparse in the library.

Tested with h5committest.

20 files changed, 109 insertions, 103 deletions

diff --git a/MANIFEST b/MANIFEST
index bd382f9..e8a4f3a 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -857,8 +857,8 @@
 ./src/H5Rpkg.h
 ./src/H5Rprivate.h
 ./src/H5Rpublic.h
-./src/H5RC.c
-./src/H5RCprivate.h
+./src/H5UC.c
+./src/H5UCprivate.h
 ./src/H5RS.c
 ./src/H5RSprivate.h
 ./src/H5S.c
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 91872af..8e7a3bf 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -498,12 +498,12 @@ SET (H5R_HDRS
 IDE_GENERATED_PROPERTIES ("H5R" "${H5R_HDRS}" "${H5R_SRCS}" )
 
 
-SET (H5RC_SRCS
-    ${HDF5_SRC_DIR}/H5RC.c
+SET (H5UC_SRCS
+    ${HDF5_SRC_DIR}/H5UC.c
 )
-SET (H5RC_HDRS
+SET (H5UC_HDRS
 )
-IDE_GENERATED_PROPERTIES ("H5RC" "${H5RC_HDRS}" "${H5RC_SRCS}" )
+IDE_GENERATED_PROPERTIES ("H5UC" "${H5UC_HDRS}" "${H5UC_SRCS}" )
 
 
 SET (H5RS_SRCS
@@ -673,7 +673,7 @@ SET (common_SRCS
     ${H5P_SRCS}
     ${H5PL_SRCS}
     ${H5R_SRCS}
-    ${H5RC_SRCS}
+    ${H5UC_SRCS}
     ${H5RS_SRCS}
     ${H5S_SRCS}
     ${H5SL_SRCS}
@@ -751,7 +751,7 @@ SET (H5_PRIVATE_HEADERS
     ${HDF5_SRC_DIR}/H5Oprivate.h
     ${HDF5_SRC_DIR}/H5Pprivate.h
     ${HDF5_SRC_DIR}/H5PLprivate.h
-    ${HDF5_SRC_DIR}/H5RCprivate.h
+    ${HDF5_SRC_DIR}/H5UCprivate.h
     ${HDF5_SRC_DIR}/H5Rprivate.h
     ${HDF5_SRC_DIR}/H5RSprivate.h
     ${HDF5_SRC_DIR}/H5SLprivate.h
diff --git a/src/H5B.c b/src/H5B.c
index 27b3609..286f09d 100644
--- a/src/H5B.c
+++ b/src/H5B.c
@@ -243,8 +243,8 @@ H5B_create(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, void *udata,
     bt->nchildren = 0;
     if(NULL == (bt->rc_shared = (type->get_shared)(f, udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree node buffer")
-    H5RC_INC(bt->rc_shared);
-    shared=(H5B_shared_t *)H5RC_GET_OBJ(bt->rc_shared);
+    H5UC_INC(bt->rc_shared);
+    shared=(H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
     HDassert(shared);
     if(NULL == (bt->native = H5FL_BLK_MALLOC(native_block, shared->sizeof_keys)) ||
             NULL == (bt->child = H5FL_SEQ_MALLOC(haddr_t, (size_t)shared->two_k)))
@@ -304,7 +304,7 @@ htri_t
 H5B_find(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr, void *udata)
 {
     H5B_t	*bt = NULL;
-    H5RC_t	*rc_shared;             /* Ref-counted shared info */
+    H5UC_t	*rc_shared;             /* Ref-counted shared info */
     H5B_shared_t *shared;               /* Pointer to shared B-tree info */
     H5B_cache_ud_t cache_udata;         /* User-data for metadata cache callback */
     unsigned    idx = 0, lt = 0, rt;    /* Final, left & right key indices */
@@ -326,7 +326,7 @@ H5B_find(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr, void *u
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /*
@@ -422,7 +422,7 @@ H5B_split(H5F_t *f, hid_t dxpl_id, H5B_ins_ud_t *bt_ud, unsigned idx,
     /*
      * Initialize variables.
      */
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(bt_ud->bt->rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(bt_ud->bt->rc_shared);
     HDassert(shared);
     HDassert(bt_ud->bt->nchildren == shared->two_k);
 
@@ -576,7 +576,7 @@ H5B_insert(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr,
     H5B_ins_ud_t bt_ud = H5B_INS_UD_T_NULL; /* (Old) root node */
     H5B_ins_ud_t split_bt_ud = H5B_INS_UD_T_NULL; /* Split B-tree node */
     H5B_t       *new_root_bt = NULL;    /* New root node */
-    H5RC_t	*rc_shared;             /* Ref-counted shared info */
+    H5UC_t	*rc_shared;             /* Ref-counted shared info */
     H5B_shared_t        *shared;        /* Pointer to shared B-tree info */
     H5B_cache_ud_t cache_udata;         /* User-data for metadata cache callback */
     H5B_ins_t	my_ins = H5B_INS_ERROR;
@@ -593,7 +593,7 @@ H5B_insert(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr,
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, udata)))
         HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /* Protect the root node */
@@ -726,7 +726,7 @@ H5B_insert_child(H5B_t *bt, unsigned *bt_flags, unsigned idx,
     HDassert(bt);
     HDassert(bt_flags);
     HDassert(H5F_addr_defined(child));
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(bt->rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
     HDassert(shared);
     HDassert(bt->nchildren < shared->two_k);
 
@@ -812,7 +812,7 @@ H5B_insert_helper(H5F_t *f, hid_t dxpl_id, H5B_ins_ud_t *bt_ud,
 		  H5B_ins_ud_t *split_bt_ud/*out*/)
 {
     H5B_t       *bt;                    /* Convenience pointer to B-tree */
-    H5RC_t	*rc_shared;             /* Ref-counted shared info */
+    H5UC_t	*rc_shared;             /* Ref-counted shared info */
     H5B_shared_t *shared;               /* Pointer to shared B-tree info */
     H5B_cache_ud_t cache_udata;         /* User-data for metadata cache callback */
     unsigned	lt = 0, idx = 0, rt;    /* Left, final & right index values */
@@ -852,7 +852,7 @@ H5B_insert_helper(H5F_t *f, hid_t dxpl_id, H5B_ins_ud_t *bt_ud,
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, H5B_INS_ERROR, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /*
@@ -1135,7 +1135,7 @@ H5B_iterate_helper(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t add
     H5B_operator_t op, void *udata)
 {
     H5B_t		*bt = NULL;     /* Pointer to current B-tree node */
-    H5RC_t	        *rc_shared;     /* Ref-counted shared info */
+    H5UC_t	        *rc_shared;     /* Ref-counted shared info */
     H5B_shared_t        *shared;        /* Pointer to shared B-tree info */
     H5B_cache_ud_t      cache_udata;    /* User-data for metadata cache callback */
     uint8_t		*native = NULL;	/* Array of keys in native format */
@@ -1156,7 +1156,7 @@ H5B_iterate_helper(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t add
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /* Protect the initial/current node */
@@ -1333,7 +1333,7 @@ H5B_remove_helper(H5F_t *f, hid_t dxpl_id, haddr_t addr, const H5B_class_t *type
 {
     H5B_t	*bt = NULL, *sibling = NULL;
     unsigned	bt_flags = H5AC__NO_FLAGS_SET;
-    H5RC_t	*rc_shared;             /* Ref-counted shared info */
+    H5UC_t	*rc_shared;             /* Ref-counted shared info */
     H5B_shared_t *shared;               /* Pointer to shared B-tree info */
     H5B_cache_ud_t cache_udata;         /* User-data for metadata cache callback */
     unsigned    idx = 0, lt = 0, rt;    /* Final, left & right indices */
@@ -1354,7 +1354,7 @@ H5B_remove_helper(H5F_t *f, hid_t dxpl_id, haddr_t addr, const H5B_class_t *type
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, H5B_INS_ERROR, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /*
@@ -1700,7 +1700,7 @@ herr_t
 H5B_delete(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr, void *udata)
 {
     H5B_t	*bt = NULL;             /* B-tree node being operated on */
-    H5RC_t	*rc_shared;             /* Ref-counted shared info */
+    H5UC_t	*rc_shared;             /* Ref-counted shared info */
     H5B_shared_t *shared;               /* Pointer to shared B-tree info */
     H5B_cache_ud_t cache_udata;         /* User-data for metadata cache callback */
     unsigned    u;                      /* Local index variable */
@@ -1716,7 +1716,7 @@ H5B_delete(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr, void
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /* Lock this B-tree node into memory for now */
@@ -1893,7 +1893,7 @@ H5B_copy(const H5B_t *old_bt)
      * Check arguments.
      */
     HDassert(old_bt);
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(old_bt->rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(old_bt->rc_shared);
     HDassert(shared);
 
     /* Allocate memory for the new H5B_t object */
@@ -1915,7 +1915,7 @@ H5B_copy(const H5B_t *old_bt)
     HDmemcpy(new_node->child, old_bt->child, (sizeof(haddr_t) * shared->two_k));
 
     /* Increment the ref-count on the raw page */
-    H5RC_INC(new_node->rc_shared);
+    H5UC_INC(new_node->rc_shared);
 
     /* Set return value */
     ret_value = new_node;
@@ -1951,7 +1951,7 @@ H5B_get_info_helper(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t ad
     const H5B_info_ud_t *info_udata)
 {
     H5B_t *bt = NULL;           /* Pointer to current B-tree node */
-    H5RC_t *rc_shared;          /* Ref-counted shared info */
+    H5UC_t *rc_shared;          /* Ref-counted shared info */
     H5B_shared_t *shared;       /* Pointer to shared B-tree info */
     H5B_cache_ud_t cache_udata; /* User-data for metadata cache callback */
     unsigned level;		/* Node level			     */
@@ -1975,7 +1975,7 @@ H5B_get_info_helper(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t ad
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, info_udata->udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /* Get the raw node size for iteration */
@@ -2108,7 +2108,7 @@ htri_t
 H5B_valid(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr)
 {
     H5B_t               *bt = NULL;             /* The B-tree */
-    H5RC_t	        *rc_shared;             /* Ref-counted shared info */
+    H5UC_t	        *rc_shared;             /* Ref-counted shared info */
     H5B_shared_t        *shared;                /* Pointer to shared B-tree info */
     H5B_cache_ud_t      cache_udata;            /* User-data for metadata cache callback */
     htri_t		ret_value = SUCCEED;    /* Return value */
@@ -2127,7 +2127,7 @@ H5B_valid(H5F_t *f, hid_t dxpl_id, const H5B_class_t *type, haddr_t addr)
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, NULL)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /*
@@ -2173,7 +2173,7 @@ H5B_node_dest(H5B_t *bt)
 
     bt->child = H5FL_SEQ_FREE(haddr_t, bt->child);
     bt->native = H5FL_BLK_FREE(native_block, bt->native);
-    H5RC_DEC(bt->rc_shared);
+    H5UC_DEC(bt->rc_shared);
     bt = H5FL_FREE(H5B_t, bt);
 
     FUNC_LEAVE_NOAPI(SUCCEED)
diff --git a/src/H5Bcache.c b/src/H5Bcache.c
index 968c5ee..2992986 100644
--- a/src/H5Bcache.c
+++ b/src/H5Bcache.c
@@ -121,10 +121,10 @@ H5B__load(H5F_t *f, hid_t dxpl_id, haddr_t addr, void *_udata)
 
     /* Set & increment the ref-counted "shared" B-tree information for the node */
     bt->rc_shared = udata->rc_shared;
-    H5RC_INC(bt->rc_shared);
+    H5UC_INC(bt->rc_shared);
 
     /* Get a pointer to the shared info, for convenience */
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(bt->rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
     HDassert(shared);
 
     /* Allocate space for the native keys and child addresses */
@@ -217,7 +217,7 @@ H5B__flush(H5F_t *f, hid_t dxpl_id, hbool_t destroy, haddr_t addr, H5B_t *bt, un
     HDassert(f);
     HDassert(H5F_addr_defined(addr));
     HDassert(bt);
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(bt->rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
     HDassert(shared);
     HDassert(shared->type);
     HDassert(shared->type->encode);
@@ -318,7 +318,7 @@ H5B__dest(H5F_t *f, H5B_t *bt)
         H5B_shared_t *shared;               /* Pointer to shared B-tree info */
 
         /* Get the pointer to the shared B-tree info */
-        shared = (H5B_shared_t *)H5RC_GET_OBJ(bt->rc_shared);
+        shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
         HDassert(shared);
 
         /* Release the space on disk */
@@ -398,7 +398,7 @@ H5B__compute_size(const H5F_t UNUSED *f, const H5B_t *bt, size_t *size_ptr)
     HDassert(f);
     HDassert(bt);
     HDassert(bt->rc_shared);
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(bt->rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
     HDassert(shared);
     HDassert(shared->type);
     HDassert(size_ptr);
diff --git a/src/H5Bdbg.c b/src/H5Bdbg.c
index 3fb7dd8..3c81c26 100644
--- a/src/H5Bdbg.c
+++ b/src/H5Bdbg.c
@@ -59,7 +59,7 @@ H5B_debug(H5F_t *f, hid_t dxpl_id, haddr_t addr, FILE *stream, int indent, int f
 	  const H5B_class_t *type, void *udata)
 {
     H5B_t	*bt = NULL;
-    H5RC_t	*rc_shared;             /* Ref-counted shared info */
+    H5UC_t	*rc_shared;             /* Ref-counted shared info */
     H5B_shared_t *shared;               /* Pointer to shared B-tree info */
     H5B_cache_ud_t cache_udata;         /* User-data for metadata cache callback */
     unsigned	u;                      /* Local index variable */
@@ -80,7 +80,7 @@ H5B_debug(H5F_t *f, hid_t dxpl_id, haddr_t addr, FILE *stream, int indent, int f
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /*
@@ -174,7 +174,7 @@ herr_t
 H5B_assert(H5F_t *f, hid_t dxpl_id, haddr_t addr, const H5B_class_t *type, void *udata)
 {
     H5B_t	*bt = NULL;
-    H5RC_t	*rc_shared;             /* Ref-counted shared info */
+    H5UC_t	*rc_shared;             /* Ref-counted shared info */
     H5B_shared_t *shared;               /* Pointer to shared B-tree info */
     H5B_cache_ud_t cache_udata;         /* User-data for metadata cache callback */
     int	        ncell, cmp;
@@ -199,7 +199,7 @@ H5B_assert(H5F_t *f, hid_t dxpl_id, haddr_t addr, const H5B_class_t *type, void
     /* Get shared info for B-tree */
     if(NULL == (rc_shared = (type->get_shared)(f, udata)))
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree's shared ref. count object")
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(rc_shared);
     HDassert(shared);
 
     /* Initialize the queue */
@@ -208,7 +208,7 @@ H5B_assert(H5F_t *f, hid_t dxpl_id, haddr_t addr, const H5B_class_t *type, void
     cache_udata.rc_shared = rc_shared;
     bt = (H5B_t *)H5AC_protect(f, dxpl_id, H5AC_BT, addr, &cache_udata, H5AC_READ);
     HDassert(bt);
-    shared = (H5B_shared_t *)H5RC_GET_OBJ(bt->rc_shared);
+    shared = (H5B_shared_t *)H5UC_GET_OBJ(bt->rc_shared);
     HDassert(shared);
     cur = (struct child_t *)H5MM_calloc(sizeof(struct child_t));
     HDassert(cur);
diff --git a/src/H5Bpkg.h b/src/H5Bpkg.h
index 46e2b28..598b122 100644
--- a/src/H5Bpkg.h
+++ b/src/H5Bpkg.h
@@ -52,7 +52,7 @@
 typedef struct H5B_t {
     H5AC_info_t        cache_info;     /* Information for H5AC cache functions */
                                         /* _must_ be first field in structure */
-    H5RC_t		*rc_shared;	/*ref-counted shared info	     */
+    H5UC_t		*rc_shared;	/*ref-counted shared info	     */
     unsigned		level;		/*node level			     */
     unsigned		nchildren;	/*number of child pointers	     */
     haddr_t		left;		/*address of left sibling	     */
@@ -65,7 +65,7 @@ typedef struct H5B_t {
 typedef struct H5B_cache_ud_t {
     H5F_t *f;                           /* File that B-tree node is within   */
     const struct H5B_class_t *type;     /* Type of tree			     */
-    H5RC_t *rc_shared;                  /* Ref-counted shared info	     */
+    H5UC_t *rc_shared;                  /* Ref-counted shared info	     */
 } H5B_cache_ud_t;
 
 /*****************************/
diff --git a/src/H5Bprivate.h b/src/H5Bprivate.h
index 83a357b..9e95c15 100644
--- a/src/H5Bprivate.h
+++ b/src/H5Bprivate.h
@@ -34,7 +34,7 @@
 /* Private headers needed by this file */
 #include "H5private.h"		/* Generic Functions			*/
 #include "H5Fprivate.h"		/* File access				*/
-#include "H5RCprivate.h"	/* Reference counted object functions	*/
+#include "H5UCprivate.h"	/* Reference counted object functions	*/
 
 /**************************/
 /* Library Private Macros */
@@ -113,7 +113,7 @@ typedef struct H5B_shared_t {
 typedef struct H5B_class_t {
     H5B_subid_t id;					/*id as found in file*/
     size_t	sizeof_nkey;			/*size of native (memory) key*/
-    H5RC_t *    (*get_shared)(const H5F_t*, const void*);    /*shared info for node */
+    H5UC_t *    (*get_shared)(const H5F_t*, const void*);    /*shared info for node */
     herr_t	(*new_node)(H5F_t*, hid_t, H5B_ins_t, void*, void*, void*, haddr_t*);
     int         (*cmp2)(void*, void*, void*);	    /*compare 2 keys */
     int         (*cmp3)(void*, void*, void*);	    /*compare 3 keys */
diff --git a/src/H5Dbtree.c b/src/H5Dbtree.c
index 50af977..37780e7 100644
--- a/src/H5Dbtree.c
+++ b/src/H5Dbtree.c
@@ -105,7 +105,7 @@ static int H5D__btree_idx_iterate_cb(H5F_t *f, hid_t dxpl_id, const void *left_k
     haddr_t addr, const void *right_key, void *_udata);
 
 /* B-tree callbacks */
-static H5RC_t *H5D__btree_get_shared(const H5F_t *f, const void *_udata);
+static H5UC_t *H5D__btree_get_shared(const H5F_t *f, const void *_udata);
 static herr_t H5D__btree_new_node(H5F_t *f, hid_t dxpl_id, H5B_ins_t, void *_lt_key,
     void *_udata, void *_rt_key, haddr_t *addr_p /*out*/);
 static int H5D__btree_cmp2(void *_lt_key, void *_udata, void *_rt_key);
@@ -219,7 +219,7 @@ H5B_class_t H5B_BTREE[1] = {{
  *-------------------------------------------------------------------------
  */
 /* ARGSUSED */
-static H5RC_t *
+static H5UC_t *
 H5D__btree_get_shared(const H5F_t UNUSED *f, const void *_udata)
 {
     const H5D_chunk_common_ud_t *udata = (const H5D_chunk_common_ud_t *) _udata;
@@ -800,7 +800,7 @@ H5D__btree_shared_create(const H5F_t *f, H5O_storage_chunk_t *store, unsigned nd
         /* <none> */
 
     /* Make shared B-tree info reference counted */
-    if(NULL == (store->u.btree.shared = H5RC_create(shared, H5B_shared_free)))
+    if(NULL == (store->u.btree.shared = H5UC_create(shared, H5B_shared_free)))
 	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't create ref-count wrapper for shared B-tree info")
 
 done:
@@ -1186,7 +1186,7 @@ H5D__btree_idx_delete(const H5D_chk_idx_info_t *idx_info)
         /* Release the shared B-tree page */
         if(NULL == tmp_storage.u.btree.shared)
             HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "ref-counted page nil")
-        if(H5RC_DEC(tmp_storage.u.btree.shared) < 0)
+        if(H5UC_DEC(tmp_storage.u.btree.shared) < 0)
             HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
     } /* end if */
 
@@ -1268,9 +1268,9 @@ H5D__btree_idx_copy_shutdown(H5O_storage_chunk_t *storage_src,
     HDassert(storage_dst);
 
     /* Decrement refcount on shared B-tree info */
-    if(H5RC_DEC(storage_src->u.btree.shared) < 0)
+    if(H5UC_DEC(storage_src->u.btree.shared) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to decrement ref-counted page")
-    if(H5RC_DEC(storage_dst->u.btree.shared) < 0)
+    if(H5UC_DEC(storage_dst->u.btree.shared) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to decrement ref-counted page")
 
 done:
@@ -1330,7 +1330,7 @@ done:
     if(shared_init) {
         if(NULL == idx_info->storage->u.btree.shared)
             HDONE_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
-        if(H5RC_DEC(idx_info->storage->u.btree.shared) < 0)
+        if(H5UC_DEC(idx_info->storage->u.btree.shared) < 0)
             HDONE_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
     } /* end if */
 
@@ -1420,7 +1420,7 @@ H5D__btree_idx_dest(const H5D_chk_idx_info_t *idx_info)
     /* Free the raw B-tree node buffer */
     if(NULL == idx_info->storage->u.btree.shared)
         HGOTO_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
-    if(H5RC_DEC(idx_info->storage->u.btree.shared) < 0)
+    if(H5UC_DEC(idx_info->storage->u.btree.shared) < 0)
 	HGOTO_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
 
 done:
@@ -1475,7 +1475,7 @@ done:
         if(NULL == storage.u.btree.shared)
             HDONE_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
         else
-            if(H5RC_DEC(storage.u.btree.shared) < 0)
+            if(H5UC_DEC(storage.u.btree.shared) < 0)
                 HDONE_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
     } /* end if */
 
diff --git a/src/H5F.c b/src/H5F.c
index 6c220aa..78fe79f 100644
--- a/src/H5F.c
+++ b/src/H5F.c
@@ -3200,7 +3200,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F_set_grp_btree_shared(H5F_t *f, H5RC_t *rc)
+H5F_set_grp_btree_shared(H5F_t *f, H5UC_t *rc)
 {
     /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
     FUNC_ENTER_NOAPI_NOINIT_NOERR
diff --git a/src/H5Fpkg.h b/src/H5Fpkg.h
index beb7e88..2465222 100644
--- a/src/H5Fpkg.h
+++ b/src/H5Fpkg.h
@@ -42,7 +42,7 @@
 #include "H5FSprivate.h"	/* File free space                      */
 #include "H5Gprivate.h"		/* Groups 			  	*/
 #include "H5Oprivate.h"         /* Object header messages               */
-#include "H5RCprivate.h"	/* Reference counted object functions	*/
+#include "H5UCprivate.h"	/* Reference counted object functions	*/
 
 
 /*
@@ -236,7 +236,7 @@ struct H5F_file_t {
     struct H5HG_heap_t **cwfs;	/* Global heap cache			*/
     struct H5G_t *root_grp;	/* Open root group			*/
     H5FO_t *open_objs;          /* Open objects in file                 */
-    H5RC_t *grp_btree_shared;   /* Ref-counted group B-tree node info   */
+    H5UC_t *grp_btree_shared;   /* Ref-counted group B-tree node info   */
 
     /* File space allocation information */
     H5F_file_space_type_t fs_strategy;	/* File space handling strategy		*/
diff --git a/src/H5Fprivate.h b/src/H5Fprivate.h
index afad362..572df76 100644
--- a/src/H5Fprivate.h
+++ b/src/H5Fprivate.h
@@ -549,7 +549,7 @@ typedef struct H5F_blk_aggr_t H5F_blk_aggr_t;
 
 /* Forward declarations for prototype arguments */
 struct H5B_class_t;
-struct H5RC_t;
+struct H5UC_t;
 struct H5O_loc_t;
 struct H5HG_heap_t;
 
@@ -599,8 +599,8 @@ H5_DLL unsigned H5F_gc_ref(const H5F_t *f);
 H5_DLL hbool_t H5F_use_latest_format(const H5F_t *f);
 H5_DLL hbool_t H5F_store_msg_crt_idx(const H5F_t *f);
 H5_DLL herr_t H5F_set_store_msg_crt_idx(H5F_t *f, hbool_t flag);
-H5_DLL struct H5RC_t *H5F_grp_btree_shared(const H5F_t *f);
-H5_DLL herr_t H5F_set_grp_btree_shared(H5F_t *f, struct H5RC_t *rc);
+H5_DLL struct H5UC_t *H5F_grp_btree_shared(const H5F_t *f);
+H5_DLL herr_t H5F_set_grp_btree_shared(H5F_t *f, struct H5UC_t *rc);
 H5_DLL hbool_t H5F_use_tmp_space(const H5F_t *f);
 H5_DLL hbool_t H5F_is_tmp_addr(const H5F_t *f, haddr_t addr);
 
diff --git a/src/H5Fquery.c b/src/H5Fquery.c
index c04ba24..6c3ca12 100644
--- a/src/H5Fquery.c
+++ b/src/H5Fquery.c
@@ -703,7 +703,7 @@ H5F_get_base_addr(const H5F_t *f)
  *
  *-------------------------------------------------------------------------
  */
-H5RC_t *
+H5UC_t *
 H5F_grp_btree_shared(const H5F_t *f)
 {
     /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
diff --git a/src/H5Gnode.c b/src/H5Gnode.c
index c0d2885..3c238ce 100644
--- a/src/H5Gnode.c
+++ b/src/H5Gnode.c
@@ -77,7 +77,7 @@ typedef struct H5G_node_key_t {
 /********************/
 
 /* B-tree callbacks */
-static H5RC_t *H5G_node_get_shared(const H5F_t *f, const void *_udata);
+static H5UC_t *H5G_node_get_shared(const H5F_t *f, const void *_udata);
 static herr_t H5G_node_create(H5F_t *f, hid_t dxpl_id, H5B_ins_t op, void *_lt_key,
 			      void *_udata, void *_rt_key,
 			      haddr_t *addr_p/*out*/);
@@ -156,7 +156,7 @@ H5FL_SEQ_DEFINE(H5G_entry_t);
  *
  *-------------------------------------------------------------------------
  */
-static H5RC_t *
+static H5UC_t *
 H5G_node_get_shared(const H5F_t *f, const void UNUSED *_udata)
 {
     FUNC_ENTER_NOAPI_NOINIT_NOERR
@@ -1189,7 +1189,7 @@ H5G__node_init(H5F_t *f)
         /* <none> */
 
     /* Make shared B-tree info reference counted */
-    if(H5F_SET_GRP_BTREE_SHARED(f, H5RC_create(shared, H5B_shared_free)) < 0)
+    if(H5F_SET_GRP_BTREE_SHARED(f, H5UC_create(shared, H5B_shared_free)) < 0)
 	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't create ref-count wrapper for shared B-tree info")
 
 done:
@@ -1222,7 +1222,7 @@ H5G_node_close(const H5F_t *f)
 
     /* Free the raw B-tree node buffer */
     if(H5F_GRP_BTREE_SHARED(f))
-        H5RC_DEC(H5F_GRP_BTREE_SHARED(f));
+        H5UC_DEC(H5F_GRP_BTREE_SHARED(f));
 
     FUNC_LEAVE_NOAPI(SUCCEED)
 } /* end H5G_node_close */
diff --git a/src/H5Oprivate.h b/src/H5Oprivate.h
index 8e2dfa4..d5cd621 100644
--- a/src/H5Oprivate.h
+++ b/src/H5Oprivate.h
@@ -392,7 +392,7 @@ typedef struct H5O_storage_contig_t {
 
 typedef struct H5O_storage_chunk_btree_t {
     haddr_t     dset_ohdr_addr;         /* File address dataset's object header */
-    H5RC_t     *shared;			/* Ref-counted shared info for B-tree nodes */
+    H5UC_t     *shared;			/* Ref-counted shared info for B-tree nodes */
 } H5O_storage_chunk_btree_t;
 
 typedef struct H5O_storage_chunk_t {
diff --git a/src/H5RC.c b/src/H5UC.c
index 6abe837..5762cc5 100644
--- a/src/H5RC.c
+++ b/src/H5UC.c
@@ -18,28 +18,31 @@
  *
  * These are used for various internal buffers which are shared.
  *
+ * The module used to be H5RC, but changed to H5UC because of 
+ * conflicting requirement for the use of H5RC.
+ *
  */
 
 
 #include "H5Eprivate.h"		/* Error handling		  	*/
 #include "H5FLprivate.h"	/* Free lists                           */
-#include "H5RCprivate.h"        /* Reference-counted buffers            */
+#include "H5UCprivate.h"        /* Reference-counted buffers            */
 
 /* Private typedefs & structs */
 
-/* Declare a free list to manage the H5RC_t struct */
-H5FL_DEFINE_STATIC(H5RC_t);
+/* Declare a free list to manage the H5UC_t struct */
+H5FL_DEFINE_STATIC(H5UC_t);
 
 
 /*--------------------------------------------------------------------------
  NAME
-    H5RC_create
+    H5UC_create
  PURPOSE
     Create a reference counted object
  USAGE
-    H5RC_t *H5RC_create(o,free)
+    H5UC_t *H5UC_create(o,free)
         const void *o;          IN: Object to initialize ref-counted object with
-        H5RC_free_func_t free;  IN: Function to call when ref-count drop to zero
+        H5UC_free_func_t free;  IN: Function to call when ref-count drop to zero
 
  RETURNS
     Returns a pointer to a new ref-counted object on success, NULL on failure.
@@ -52,10 +55,10 @@ H5FL_DEFINE_STATIC(H5RC_t);
  EXAMPLES
  REVISION LOG
 --------------------------------------------------------------------------*/
-H5RC_t *
-H5RC_create(void *o, H5RC_free_func_t free_func)
+H5UC_t *
+H5UC_create(void *o, H5UC_free_func_t free_func)
 {
-    H5RC_t *ret_value;   /* Return value */
+    H5UC_t *ret_value;   /* Return value */
 
     FUNC_ENTER_NOAPI(NULL)
 
@@ -64,7 +67,7 @@ H5RC_create(void *o, H5RC_free_func_t free_func)
     HDassert(free_func);
 
     /* Allocate ref-counted string structure */
-    if(NULL == (ret_value = H5FL_MALLOC(H5RC_t)))
+    if(NULL == (ret_value = H5FL_MALLOC(H5UC_t)))
         HGOTO_ERROR(H5E_RS,H5E_NOSPACE,NULL,"memory allocation failed")
 
     /* Set the internal fields */
@@ -74,17 +77,17 @@ H5RC_create(void *o, H5RC_free_func_t free_func)
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5RC_create() */
+} /* end H5UC_create() */
 
 
 /*--------------------------------------------------------------------------
  NAME
-    H5RC_decr
+    H5UC_decr
  PURPOSE
     Decrement the reference count for a ref-counted object
  USAGE
-    herr_t H5RC_decr(rc)
-        H5RC_t *rc;             IN: Ref-counted object to decrement count for
+    herr_t H5UC_decr(rc)
+        H5UC_t *rc;             IN: Ref-counted object to decrement count for
 
  RETURNS
     SUCCEED/FAIL
@@ -97,7 +100,7 @@ done:
  REVISION LOG
 --------------------------------------------------------------------------*/
 herr_t
-H5RC_decr(H5RC_t *rc)
+H5UC_decr(H5UC_t *rc)
 {
     herr_t ret_value = SUCCEED;   /* Return value */
 
@@ -115,13 +118,13 @@ H5RC_decr(H5RC_t *rc)
     /* Check if we should delete this object now */
     if(rc->n == 0) {
         if((rc->free_func)(rc->o) < 0) {
-            rc = H5FL_FREE(H5RC_t, rc);
+            rc = H5FL_FREE(H5UC_t, rc);
             HGOTO_ERROR(H5E_RS, H5E_CANTFREE, FAIL, "memory release failed")
         } /* end if */
-        rc = H5FL_FREE(H5RC_t, rc);
+        rc = H5FL_FREE(H5UC_t, rc);
     } /* end if */
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5RC_decr() */
+} /* end H5UC_decr() */
 
diff --git a/src/H5RCprivate.h b/src/H5UCprivate.h
index 2fe3551..a702c03 100644
--- a/src/H5RCprivate.h
+++ b/src/H5UCprivate.h
@@ -14,16 +14,19 @@
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 /*
- * This file contains private information about the H5RC module
+ * This file contains private information about the H5UC module
+ * The module used to be H5RC, but changed to H5UC because of 
+ * conflicting requirement for the use of H5RC.
  */
-#ifndef _H5RCprivate_H
-#define _H5RCprivate_H
+
+#ifndef _H5UCprivate_H
+#define _H5UCprivate_H
 
 /**************************************/
 /* Public headers needed by this file */
 /**************************************/
 #ifdef LATER
-#include "H5RCpublic.h"
+#include "H5UCpublic.h"
 #endif /* LATER */
 
 /***************************************/
@@ -36,27 +39,27 @@
 /************/
 
 /* Typedef for function to release object when reference count drops to zero */
-typedef herr_t (*H5RC_free_func_t)(void *o);
+typedef herr_t (*H5UC_free_func_t)(void *o);
 
 /* Typedef for reference counted objects */
-typedef struct H5RC_t {
+typedef struct H5UC_t {
     void *o;            /* Object to be reference counted */
     size_t n;           /* Reference count of number of pointers sharing object */
-    H5RC_free_func_t free_func; /* Function to free object */
-} H5RC_t;
+    H5UC_free_func_t free_func; /* Function to free object */
+} H5UC_t;
 
 /**********/
 /* Macros */
 /**********/
-#define H5RC_INC(rc)            ((rc)->n++)
-#define H5RC_DEC(rc)            (H5RC_decr(rc))
-#define H5RC_GET_OBJ(rc)        ((rc)->o)
+#define H5UC_INC(rc)            ((rc)->n++)
+#define H5UC_DEC(rc)            (H5UC_decr(rc))
+#define H5UC_GET_OBJ(rc)        ((rc)->o)
 
 /********************/
 /* Private routines */
 /********************/
-H5_DLL H5RC_t *H5RC_create(void *s, H5RC_free_func_t free_func);
-H5_DLL herr_t H5RC_decr(H5RC_t *rc);
+H5_DLL H5UC_t *H5UC_create(void *s, H5UC_free_func_t free_func);
+H5_DLL herr_t H5UC_decr(H5UC_t *rc);
 
 #endif /* _H5RSprivate_H */
 
diff --git a/src/Makefile.am b/src/Makefile.am
index 5f383e0..40b5f6b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -92,7 +92,7 @@ libhdf5_la_SOURCES= H5.c H5checksum.c H5dbg.c H5system.c H5timer.c H5trace.c \
         H5Plapl.c H5Plcpl.c H5Pocpl.c H5Pocpypl.c H5Pstrcpl.c H5Ptest.c \
         H5PL.c \
         H5R.c H5Rdeprec.c \
-        H5RC.c \
+        H5UC.c \
         H5RS.c \
         H5S.c H5Sall.c H5Sdbg.c H5Shyper.c H5Smpio.c H5Snone.c H5Spoint.c \
         H5Sselect.c H5Stest.c \
diff --git a/src/Makefile.in b/src/Makefile.in
index 1163f08..609aea5 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -160,7 +160,7 @@ am_libhdf5_la_OBJECTS = H5.lo H5checksum.lo H5dbg.lo H5system.lo \
 	H5Pdapl.lo H5Pdcpl.lo H5Pdeprec.lo H5Pdxpl.lo H5Pencdec.lo \
 	H5Pfapl.lo H5Pfcpl.lo H5Pfmpl.lo H5Pgcpl.lo H5Pint.lo \
 	H5Plapl.lo H5Plcpl.lo H5Pocpl.lo H5Pocpypl.lo H5Pstrcpl.lo \
-	H5Ptest.lo H5PL.lo H5R.lo H5Rdeprec.lo H5RC.lo H5RS.lo H5S.lo \
+	H5Ptest.lo H5PL.lo H5R.lo H5Rdeprec.lo H5UC.lo H5RS.lo H5S.lo \
 	H5Sall.lo H5Sdbg.lo H5Shyper.lo H5Smpio.lo H5Snone.lo \
 	H5Spoint.lo H5Sselect.lo H5Stest.lo H5SL.lo H5SM.lo \
 	H5SMbtree2.lo H5SMcache.lo H5SMmessage.lo H5SMtest.lo H5ST.lo \
@@ -589,7 +589,7 @@ libhdf5_la_SOURCES = H5.c H5checksum.c H5dbg.c H5system.c H5timer.c H5trace.c \
         H5Plapl.c H5Plcpl.c H5Pocpl.c H5Pocpypl.c H5Pstrcpl.c H5Ptest.c \
         H5PL.c \
         H5R.c H5Rdeprec.c \
-        H5RC.c \
+        H5UC.c \
         H5RS.c \
         H5S.c H5Sall.c H5Sdbg.c H5Shyper.c H5Smpio.c H5Snone.c H5Spoint.c \
         H5Sselect.c H5Stest.c \
@@ -957,7 +957,6 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pstrcpl.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Ptest.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5R.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5RC.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5RS.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Rdeprec.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5S.Plo@am__quote@
@@ -1001,6 +1000,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Tstrpad.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Tvisit.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Tvlen.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5UC.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5V.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5WB.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Z.Plo@am__quote@
diff --git a/src/hdf5.lnt b/src/hdf5.lnt
index 1d02039..6865720 100644
--- a/src/hdf5.lnt
+++ b/src/hdf5.lnt
@@ -33,7 +33,7 @@
 -esym(534, H5CS_push, H5CS_pop)
 -esym(534, H5I_clear_type, H5I_dec_type_ref)
 -esym(534, H5MM_xfree)
--esym(534, H5RC_decr)
+-esym(534, H5UC_decr)
 -esym(534, H5V_array_fill)
 
 
diff --git a/vms/src/make.com b/vms/src/make.com
index cdf0f4a..20429b2 100644
--- a/vms/src/make.com
+++ b/vms/src/make.com
@@ -59,7 +59,7 @@ $ cobj1= "H5MFaggr, H5MF, H5MFdbg, H5MFsection, H5MM,"+-
         "H5Orefcount, H5Osdspace, H5Oshared, H5Oshmesg, H5Ostab, H5Otest, H5Ounknown,"+-
         "H5Pacpl, H5P, H5Pdapl, H5Pdcpl, H5Pdeprec, H5Pdxpl, H5Pencdec, H5Pfapl, H5Pfcpl, H5Pfmpl, H5Pgcpl, H5Pint,"+-
         "H5Plapl, H5Plcpl, H5Pocpl, H5Pocpypl, H5Pstrcpl, H5Ptest,"+-
-        "H5R, H5RC, H5Rdeprec, H5RS, H5Sall, H5S, H5Sdbg, H5Shyper, H5SL, H5SMbtree2, H5SM, H5SMcache,"+-
+        "H5R, H5UC, H5Rdeprec, H5RS, H5Sall, H5S, H5Sdbg, H5Shyper, H5SL, H5SMbtree2, H5SM, H5SMcache,"+-
         "H5SMmessage, H5Smpio, H5SMtest, H5Snone, H5Spoint, H5Sselect, H5ST, H5Stest,"+-
         "H5Tarray, H5Tbit, H5T, H5Tcommit, H5Tcompound, H5Tconv, H5Tcset, H5Tdbg, H5Tdeprec, H5Tenum,"+-
         "H5Tfields, H5Tfixed, H5Tfloat, H5Tinit, H5Tnative, H5Toffset, H5Toh, H5Topaque, H5Torder,"+-