- Increment the pipeline depth before we trigger the send function. As

mentioned in the comment the completion/callback of the triggered 
  send operation can happen before the call returns. If this happens and
  if the pipeline depth is 0 before we triggered the send operation and 
  this is the last send operation of the request then the completion detection
  code will decrement the pipeline depth and check it for equality to 0.
  Because (0-1) != 0 the pml completion function for this request will 
  *not* be called.
  This part 2 of the fix for ticket #246.

This commit was SVN r12292.

ompi/mca/pml/ob1/pml_ob1_sendreq.c

@@ -967,14 +967,15 @@ int mca_pml_ob1_send_request_schedule_exclusive(
 #endif  /* OMPI_WANT_PERUSE */
 
             /* initiate send - note that this may complete before the call returns */
+            OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,1);
             rc = mca_bml_base_send(bml_btl, des, MCA_BTL_TAG_PML);
                 
             if(rc == OMPI_SUCCESS) {
                 bytes_remaining -= size;
                 /* update state */
                 sendreq->req_send_offset += size;
-                OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,1);
-            } else {
+            } else { 
+                OPAL_THREAD_ADD_SIZE_T(&sendreq->req_pipeline_depth,-1);
                 mca_bml_base_free(bml_btl,des);
                 continue;
             }