[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.2a1-23-g2479d89

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http://git.mpich.org/mpich.git/commitdiff/2479d8922a29cb9c000aaef9c5d8e29bccbd931e

commit 2479d8922a29cb9c000aaef9c5d8e29bccbd931e
Author: Min Si <msi at il.is.s.u-tokyo.ac.jp>
Date:   Mon Sep 22 13:15:40 2014 -0500

    Added mb in flush handler. Resolves #2177.
    
    Since flush call guarantees the completion of operations on target side,
    a memory barrier on target side is necessary in order to ensure all store
    instructions are exactly performed before that flush call finished on origin
    side.
    
    Signed-off-by: Xin Zhao <xinzhao3 at illinois.edu>

diff --git a/src/mpid/ch3/src/ch3u_rma_sync.c b/src/mpid/ch3/src/ch3u_rma_sync.c
index 3e2daf0..918423f 100644
--- a/src/mpid/ch3/src/ch3u_rma_sync.c
+++ b/src/mpid/ch3/src/ch3u_rma_sync.c
@@ -6205,6 +6205,10 @@ int MPIDI_CH3_Finish_rma_op_target(MPIDI_VC_t *vc, MPID_Win *win_ptr, int is_rma
         MPIDI_CH3_Progress_signal_completion();
     }
     else if (flags & MPIDI_CH3_PKT_FLAG_RMA_FLUSH) {
+        /* Ensure store instructions have been performed before flush call is
+         * finished on origin process. */
+        OPA_read_write_barrier();
+
         if (flags & MPIDI_CH3_PKT_FLAG_RMA_REQ_ACK) {
             MPIDI_CH3_Pkt_t upkt;
             MPIDI_CH3_Pkt_flush_t *flush_pkt = &upkt.flush;

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

Summary of changes:
 src/mpid/ch3/src/ch3u_rma_sync.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)


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