[svn-r19588] Description:

	Bring r19587 from trunk to 1.8 branch:

	Address issue with object headers being created getting evicted from
the metadata cache cache before they are completely initialized.  This is
done by pinning the object header in the cache until it is completely
initialized and attached to a group.

Tested on:
        FreeBSD/32 6.3 (duty) in debug mode
        FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode
        Linux/64-amd64 2.6 (amani) w/Intel compilers, w/default API=1.6.x,
                w/C++ & FORTRAN, in production mode
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                w/szip filter, w/threadsafe, in production mode
        Linux/PPC 2.6 (heiwa) w/C++ & FORTRAN, w/threadsafe, in debug mode
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                in production mode

1 files changed, 16 insertions, 1 deletions

diff --git a/src/H5Tcommit.c b/src/H5Tcommit.c
index b924b61..e109f95 100644
--- a/src/H5Tcommit.c
+++ b/src/H5Tcommit.c
@@ -302,6 +302,19 @@ H5Tcommit_anon(hid_t loc_id, hid_t type_id, hid_t tcpl_id, hid_t tapl_id)
     if(H5T_commit(loc.oloc->file, type, tcpl_id, H5AC_dxpl_id) < 0)
 	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to commit datatype")
 
+    /* Release the datatype's object header */
+    {
+        H5O_loc_t *oloc;         /* Object location for datatype */
+
+        /* Get the new committed datatype's object location */
+        if(NULL == (oloc = H5T_oloc(type)))
+            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "unable to get object location of committed datatype")
+
+        /* Decrement refcount on committed datatype's object header in memory */
+        if(H5O_dec_rc_by_loc(oloc, H5AC_dxpl_id) < 0)
+           HGOTO_ERROR(H5E_DATATYPE, H5E_CANTDEC, FAIL, "unable to decrement refcount on newly created object")
+    } /* end if */
+
 done:
     FUNC_LEAVE_API(ret_value)
 } /* end H5Tcommit_anon() */
@@ -379,7 +392,7 @@ H5T_commit(H5F_t *file, H5T_t *type, hid_t tcpl_id, hid_t dxpl_id)
      * Create the object header and open it for write access. Insert the data
      * type message and then give the object header a name.
      */
-    if(H5O_create(file, dxpl_id, dtype_size, tcpl_id, &temp_oloc) < 0)
+    if(H5O_create(file, dxpl_id, dtype_size, (size_t)1, tcpl_id, &temp_oloc) < 0)
 	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to create datatype object header")
     if(H5O_msg_create(&temp_oloc, H5O_DTYPE_ID, H5O_MSG_FLAG_CONSTANT | H5O_MSG_FLAG_DONTSHARE, H5O_UPDATE_TIME, type, dxpl_id) < 0)
 	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to update type header message")
@@ -415,6 +428,8 @@ done:
             H5G_name_free(&temp_path);
         } /* end if */
         if((type->shared->state == H5T_STATE_TRANSIENT || type->shared->state == H5T_STATE_RDONLY) && (type->sh_loc.type == H5O_SHARE_TYPE_COMMITTED)) {
+            if(H5O_dec_rc_by_loc(&(type->oloc), dxpl_id) < 0)
+                HDONE_ERROR(H5E_DATATYPE, H5E_CANTDEC, FAIL, "unable to decrement refcount on newly created object")
 	    if(H5O_close(&(type->oloc)) < 0)
                 HDONE_ERROR(H5E_DATATYPE, H5E_CLOSEERROR, FAIL, "unable to release object header")
             if(H5O_delete(file, dxpl_id, type->sh_loc.u.loc.oh_addr) < 0)