From c975f49984d5da0ba5a9cd4fb3f8918bb49b595c Mon Sep 17 00:00:00 2001
From: Quincey Koziol <koziol@hdfgroup.org>
Date: Tue, 27 Mar 2018 14:20:50 -0500
Subject: Add an assert to verify that we don't write when between
 MPI_Barrier() calls during a flush.

---
 src/H5FDmpio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/H5FDmpio.c b/src/H5FDmpio.c
index a898786..ee3277d 100644
--- a/src/H5FDmpio.c
+++ b/src/H5FDmpio.c
@@ -1730,6 +1730,9 @@ H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
     HDassert(H5FD_MPIO==file->pub.driver_id);
     HDassert(buf);
 
+    /* Verify that no data is written when between MPI_Barrier()s during file flush */
+    HDassert(!H5CX_get_mpi_file_flushing());
+
     /* Portably initialize MPI status variable */
     HDmemset(&mpi_stat, 0, sizeof(MPI_Status));
 
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