ch4/proc: Add lock when creating new av tables

Multiple threads could call be creating dynamic processes concurrently,
so this needs protection.

Author: raffenet

src/mpid/ch4/src/ch4_proc.c

@@ -91,6 +91,8 @@ int MPIDIU_new_avt(int size, int *avtid)
     MPIR_FUNC_ENTER;
     MPL_DBG_MSG_FMT(MPIDI_CH4_DBG_GENERAL, VERBOSE, (MPL_DBG_FDEST, " new_avt: size=%d", size));
 
+    MPID_THREAD_CS_ENTER(VCI, MPIDIU_THREAD_DYNPROC_MUTEX);
+
     *avtid = get_next_avtid();
 
     /* note: zeroed so is_local default to 0, which is true for *avtid > 0 */
@@ -102,6 +104,8 @@ int MPIDIU_new_avt(int size, int *avtid)
     }
     MPIDI_global.avt_mgr.av_tables[*avtid] = new_av_table;
 
+    MPID_THREAD_CS_EXIT(VCI, MPIDIU_THREAD_DYNPROC_MUTEX);
+
     MPIR_FUNC_EXIT;
     return mpi_errno;
 }