[svn-r13497] Description:

        Move ref. count of # of links to an object out of the object header's
prefix and make it a header message instead (since it's a "rare" occurence),
eliminating some more space for each object in the file.

        Inserting this "ref. count" message exposed a flaw in the library's
mechanism for locating a message to promote to another chunk and replace
with a continuation message, which required some additional work to fix.
It's still not completely robust, but it's working for more cases now and
detects failures robustly.

        Reduced the minimum size of an object header chunk to just enough to
contain a header message prefix and continuation message.

Tested on:
	FreeBSD/32 6.2 (duty)

1 files changed, 8 insertions, 0 deletions

diff --git a/src/H5Oprivate.h b/src/H5Oprivate.h
index eca29e2..60d7a1d 100644
--- a/src/H5Oprivate.h
+++ b/src/H5Oprivate.h
@@ -135,6 +135,7 @@ typedef struct H5O_copy_t {
 #define H5O_BTREEK_ID   0x0013          /* v1 B-tree 'K' values message.  */
 #define H5O_DRVINFO_ID  0x0014          /* Driver info message.  */
 #define H5O_AINFO_ID    0x0015          /* Attribute info message.  */
+#define H5O_REFCOUNT_ID 0x0016          /* Reference count message.  */
 
 
 /* Shared object message flags.
@@ -429,6 +430,13 @@ typedef struct H5O_ainfo_t {
     haddr_t     name_bt2_addr;          /* Address of v2 B-tree for indexing names of "dense" attributes */
 } H5O_ainfo_t;
 
+/*
+ * Reference Count Message.
+ * (Contains # of links to object, if >1)
+ * (Data structure in memory)
+ */
+typedef uint32_t H5O_refcount_t;
+
 
 /* Typedef for iteration operations */
 typedef herr_t (*H5O_operator_t)(const void *mesg/*in*/, unsigned idx,