[svn-r335] Changes since 19980330

----------------------

./MANIFEST
./src/Makefile.in
./test/Makefile.in
        Added new files.

./config/linux
./src/H5HL.c
./src/H5HLprivate.h
./src/H5MF.c
./src/H5MFprivate.h
        Added `-DH5HL_DEBUG -DH5MF_DEBUG' to the debug list.

./html/H5.format.html
        Updated shared object message information.

./src/H5D.c
        Datasets can now share data types.

./src/H5F.c
        Updated a comment that referred to H5ACC_WRITE.

./src/H5HG.c
./src/H5HGprivate.h
        Moved a few things around.  Made debugging better so you can
        now give a collection address to ./src/debug and it shows some
        useful stuff.

./src/H5O.c
./src/H5Ocont.c
./src/H5Odtype.c
./src/H5Oefl.c
./src/H5Olayout.c
./src/H5Oname.c
./src/H5Onull.c
./src/H5Oprivate.h
./src/H5Osdspace.c
./src/H5Oshared.c       [NEW]
./src/H5Ostab.c
        Supports shared messages.

./src/H5T.c
./src/H5Tpkg.h
./src/H5Tprivate.h
./src/H5Tpublic.h
        The H5Tshare() function allows the user to give the library
        hints about how a data type will be used.

./test/shtype.c
        Tests the H5Tshare() function.

./test/gheap.c
        Tests the global heap.

./configure.in
./config/BlankForm      [NEW]
./config/alpha-dec
./config/freebsd2.2.1
./config/hpux10.20
./config/irix6.2
./config/irix64
./config/linux
./config/powerpc-ibm-aix4.2.1.0
./config/rs6000-ibm-aix4.1.4.0
./config/solaris2.5
        Cleaned up lots of configuration stuff and made the site
        configuration files lots easier and more uniform.  To make a
        new file grab the BlankForm and modify it.

        By default, debugging is turned on for most packages.  Within
        a package one can use `#ifdef H5AC_DEBUG' to wrap debugging
        code.  Other options are:

           --enable-debug
           --enable-debug=yes
               The default, most but not all packages.

           --disable-debug
           --enable-debug=no
           --enable-debug=none
               The symbol NDEBUG is defined and none of the package
               debug symbols.

           --enable-debug=all
               Debugging is turned on for all packages.  This might
               produce lots of output.

           --enable-debug=g,d
               Debugging is turned on for H5G and H5D.

        A compile mode is also now supported

           --enable-production
           --enable-production=yes
               The library is compiled with optimizations turned on.
               The compiler flags are augmented by adding PROD_CFLAGS
               and PROD_CPPFLAGS which are defined in the site config
               file.

           --disable-production
           --enable-production=no
               The default.  The library is compiled for development
               by including DEBUG_CFLAGS and DEBUG_CPPFLAGS defined in
               the site config file.  This is usually just `-g'.

           --enable-production=profile
           --enable-production=pg
               Builds a library for profiling by including the flags
               from PROFILE_CFLAGS and PROFILE_CPPFLAGS defined in the
               site config file.  This is usullay just `-pg' but it
               could include optimization flags as well depending on
               the type of profile one wants.

        In summary, configure by saying `./configure' and you'll get a
        development version of the library.  Configure by saying
        `./configure --enable-production --disable-debug' and you'll
        get a production version with no debugging code.

1 files changed, 30 insertions, 15 deletions

diff --git a/src/H5Oprivate.h b/src/H5Oprivate.h
index b20e6ed..90317fc 100644
--- a/src/H5Oprivate.h
+++ b/src/H5Oprivate.h
@@ -19,10 +19,11 @@
 
 #include <H5Opublic.h>
 
-/* Private headers neede by this file */
+/* Private headers needed by this file */
 #include <H5private.h>
 #include <H5Fprivate.h>
 #include <H5Gprivate.h>
+#include <H5HGprivate.h>
 #include <H5Tprivate.h>
 #include <H5Sprivate.h>
 
@@ -40,9 +41,10 @@
 #define H5O_NEW_MESG	(-1)		/*new message			     */
 #define H5O_ALL		(-1)		/*delete all messages of type	     */
 
-/* Flags which are part of the message id */
-#define H5O_FLAG_CONSTANT	0x8000
-#define H5O_FLAG_BITS		0x8000
+/* Flags which are part of a message */
+#define H5O_FLAG_CONSTANT	0x01
+#define H5O_FLAG_SHARED		0x02
+#define H5O_FLAG_BITS		0x03
 #define H5O_VERSION		1
 
 /*
@@ -64,21 +66,22 @@
 	       4)	/*reserved		*/
 
 typedef struct H5O_class_t {
-    intn	id;				    /*message type ID on disk*/
-    const char	*name;				 /*message name for debugging*/
-    size_t	native_size;			     /*size of native message*/
-    void	*(*decode) (H5F_t *, size_t, const uint8 *);
-    herr_t	(*encode) (H5F_t *, size_t, uint8 *, const void *);
-    void	*(*copy) (const void *, void *);     /*copy native value     */
-    size_t	(*raw_size) (H5F_t *, const void *); /*sizeof raw val	     */
-    herr_t	(*reset) (void *);		/*free nested data structures*/
-    herr_t	(*debug) (H5F_t *, const void *, FILE *, intn, intn);
+    intn	id;				 /*message type ID on disk   */
+    const char	*name;				 /*for debugging             */
+    size_t	native_size;			 /*size of native message    */
+    void	*(*decode)(H5F_t*, const uint8*, H5HG_t*);
+    herr_t	(*encode)(H5F_t*, uint8*, const void*);
+    void	*(*copy)(const void*, void*);    /*copy native value         */
+    size_t	(*raw_size)(H5F_t*, const void*);/*sizeof raw val	     */
+    herr_t	(*reset)(void *);		 /*free nested data structs  */
+    herr_t	(*share)(H5F_t*, const void*, H5HG_t*);
+    herr_t	(*debug)(H5F_t*, const void*, FILE*, intn, intn);
 } H5O_class_t;
 
 typedef struct H5O_mesg_t {
     const H5O_class_t	*type;		/*type of message		     */
     hbool_t		dirty;		/*raw out of date wrt native	     */
-    hbool_t		constant;	/*is message constant?		     */
+    uint8		flags;		/*message flags			     */
     void		*native;	/*native format message		     */
     uint8		*raw;		/*ptr to raw data		     */
     size_t		raw_size;	/*size with alignment		     */
@@ -169,10 +172,20 @@ typedef struct H5O_layout_t {
 extern const H5O_class_t H5O_NAME[1];
 
 typedef struct H5O_name_t {
-    const char	*s;			/*ptr to malloc'd memory	     */
+    char	*s;			/*ptr to malloc'd memory	     */
 } H5O_name_t;
 
 /*
+ * Shared object message.  This message ID never really appears in an object
+ * header.  Instead, bit 2 of the `Flags' field will be set and the ID field
+ * will be the ID of the pointed-to message.
+ */
+#define H5O_SHARED_ID	0x000f
+extern const H5O_class_t H5O_SHARED[1];
+
+typedef H5HG_t H5O_shared_t;
+
+/*
  * Object header continuation message.
  */
 #define H5O_CONT_ID	0x0010
@@ -211,6 +224,8 @@ intn H5O_modify (H5G_entry_t *ent, const H5O_class_t *type, intn overwrite,
 		 uintn flags, const void *mesg);
 herr_t H5O_remove (H5G_entry_t *ent, const H5O_class_t *type, intn sequence);
 herr_t H5O_reset (const H5O_class_t *type, void *native);
+herr_t H5O_share (H5F_t *f, const H5O_class_t *type, const void *mesg,
+		  H5HG_t *hobj/*out*/);
 herr_t H5O_debug (H5F_t *f, const haddr_t *addr, FILE * stream, intn indent,
 		  intn fwidth);