From 5194f75c72a1e45fbe1f4ca7b7ec2e968168f89c Mon Sep 17 00:00:00 2001
From: degomme <adegomme@users.noreply.github.com>
Date: Fri, 29 Mar 2019 11:38:05 +0100
Subject: [PATCH] fix case where bcast is called with only one proc (and thus
 skipped)

---
 src/smpi/bindings/smpi_pmpi_coll.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/smpi/bindings/smpi_pmpi_coll.cpp b/src/smpi/bindings/smpi_pmpi_coll.cpp
index 3a82044232..91bbfd8494 100644
--- a/src/smpi/bindings/smpi_pmpi_coll.cpp
+++ b/src/smpi/bindings/smpi_pmpi_coll.cpp
@@ -70,6 +70,9 @@ int PMPI_Ibcast(void *buf, int count, MPI_Datatype datatype,
         simgrid::smpi::Colls::bcast(buf, count, datatype, root, comm);
       else
         simgrid::smpi::Colls::ibcast(buf, count, datatype, root, comm, request);
+    } else {
+      if(request!=MPI_REQUEST_IGNORED)
+        *request = MPI_REQUEST_NULL;
     }
     retval = MPI_SUCCESS;
 
-- 
2.20.1