[svn-r16630] Description:

	Add 'notify' callback to metadata cache clients, so that they can be
aware when the cache has taken/will take certain actions.  Notifications are
urrently limited to when an entry has successfully entered the cache (via an
insertion or a load from the file) and when an entry is about to be evicted
from the cache.

Tested on:
        FreeBSD/32 6.3 (duty) in debug mode
        FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode
        Linux/32 2.6 (jam) w/PGI compilers, w/C++ & FORTRAN, w/threadsafe,
                                in debug mode
        Linux/64-amd64 2.6 (smirom) 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, in production mode
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                                in production mode
        Linux/64-ia64 2.4 (tg-login3) w/parallel, w/FORTRAN, in production mode
        Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in production mode
        Mac OS X/32 10.5.6 (amazon) in debug mode
        Mac OS X/32 10.5.6 (amazon) w/C++ & FORTRAN, w/threadsafe,
                                in production mode

1 files changed, 1 insertions, 0 deletions

diff --git a/src/H5HGcache.c b/src/H5HGcache.c
index 1a9e92c..747c41e 100644
--- a/src/H5HGcache.c
+++ b/src/H5HGcache.c
@@ -92,6 +92,7 @@ const H5AC_class_t H5AC_GHEAP[1] = {{
     (H5AC_flush_func_t)H5HG_flush,
     (H5AC_dest_func_t)H5HG_dest,
     (H5AC_clear_func_t)H5HG_clear,
+    (H5AC_notify_func_t)NULL,
     (H5AC_size_func_t)H5HG_size,
 }};