[svn-r16985] Description:

	Interim checkin of work toward closing race condition window which can
cause errors when reading a file that is used for SWMR-write access.

	This change introduces a chunk proxy in the metadata cache, which
participates in the metadata cache's flush dependencies while representing a
raw data chunk in a dataset's chunk cache.

	Also, the extensible array's SWMR behavior is only invoked when the
file is opened for SWMR-write access, allowing more flexibility in flushing
extensible array data structure pieces when SWMR-write is not enabled.

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
        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 debug 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/H5ACprivate.h b/src/H5ACprivate.h
index 6bf1afe..8122567 100644
--- a/src/H5ACprivate.h
+++ b/src/H5ACprivate.h
@@ -67,6 +67,7 @@ typedef enum {
     H5AC_EARRAY_SBLOCK_ID, /*extensible array super block	     */
     H5AC_EARRAY_DBLOCK_ID, /*extensible array data block	     */
     H5AC_EARRAY_DBLK_PAGE_ID, /*extensible array data block page     */
+    H5AC_CHUNK_PROXY_ID, /*chunk proxy				     */
     H5AC_TEST_ID,	/*test entry -- not used for actual files    */
     H5AC_NTYPES		/* Number of types, must be last             */
 } H5AC_type_t;