[svn-r630] Added code to eliminate redundant writes of metadata,

so only proc 0 writes it to disk.  The elimination is activated
only when the environment variable HDF5_MPI_1_METAWRITE is nonzero;
otherwise all processes that opened the file will write the metadata to disk.

1 files changed, 25 insertions, 0 deletions

diff --git a/src/H5Fmpioprivate.h b/src/H5Fmpioprivate.h
new file mode 100644
index 0000000..a51eb36
--- /dev/null
+++ b/src/H5Fmpioprivate.h
@@ -0,0 +1,25 @@
+/****************************************************************************
+ * NCSA HDF								    *
+ * Software Development Group						    *
+ * National Center for Supercomputing Applications			    *
+ * University of Illinois at Urbana-Champaign				    *
+ * 605 E. Springfield, Champaign IL 61820				    *
+ *									    *
+ * For conditions of distribution and use, see the accompanying		    *
+ * hdf/COPYING file.							    *
+ *									    *
+ ****************************************************************************/
+
+/*
+ * This file contains macros & information for MPI-IO file access
+ */
+
+#ifndef _H5Fmpioprivate_H
+#define _H5Fmpioprivate_H
+
+#ifdef HAVE_PARALLEL
+extern	hbool_t H5_mpi_1_metawrite_g;
+hbool_t H5F_mpio_tas_allsame(H5F_low_t *lf, hbool_t newval );
+#endif /* HAVE_PARALLEL */
+
+#endif