Fix issue where messages could start arriving before the window was

fully initialized, especially during lock/unlock, which doesn't use MPI
collectives for synchronization (unlike Fence)

This commit was SVN r12676.

ompi/mca/osc/rdma/osc_rdma.c

@@ -24,6 +24,7 @@
 #include "ompi/win/win.h"
 #include "ompi/communicator/communicator.h"
 #include "ompi/mca/btl/btl.h"
+#include "ompi/mca/osc/base/base.h"
 #include "mpi.h"
 
 
@@ -38,6 +39,9 @@ ompi_osc_rdma_module_free(ompi_win_t *win)
         opal_progress();
     }
 
+    opal_output_verbose(50, ompi_osc_base_output,
+                        "Finalizing window %d", module->p2p_comm->c_contextid);
+
     /* finish with a barrier */
     if (ompi_group_size(win->w_group) > 1) {
         ret = module->p2p_comm->c_coll.coll_barrier(module->p2p_comm);

ompi/mca/osc/rdma/osc_rdma_component.c

@@ -419,13 +419,12 @@ ompi_osc_rdma_component_select(ompi_win_t *win,
                                    NULL);
     }
 
+    /* need to make create a collective, or lock requests can come in
+       before the window is fully created... */
+    module->p2p_comm->c_coll.coll_barrier(module->p2p_comm);
 
-    if (module->p2p_eager_send) {
+    opal_output_verbose(50, ompi_osc_base_output,
-        /* need to barrier if eager sending or we can receive before the
+                        "created window %d", module->p2p_comm->c_contextid);
-           other side has been fully setup, causing much gnashing of
-           teeth. */
-        module->p2p_comm->c_coll.coll_barrier(module->p2p_comm);
-    }
 
     return ret;
 }