Have opal_progress() return the number of events it encountered

This information can used by callers to decide how to proceed
based on whether operations have progressed.

Signed-off-by: Joseph Schuchart <schuchart@icl.utk.edu>
(cherry picked from commit 8961692)

Author: devreal

opal/runtime/opal_progress.c

@@ -213,7 +213,7 @@ static int opal_progress_events(void)
  * care, as the cost of that happening is far outweighed by the cost
  * of the if checks (they were resulting in bad pipe stalling behavior)
  */
-void opal_progress(void)
+int opal_progress(void)
 {
     static uint32_t num_calls = 0;
     size_t i;
@@ -250,6 +250,8 @@ void opal_progress(void)
          */
         opal_thread_yield();
     }
+
+    return events;
 }
 
 int opal_progress_set_event_flag(int flag)

opal/runtime/opal_progress.h

@@ -57,8 +57,10 @@ OPAL_DECLSPEC int opal_progress_init(void);
  * opal_progress_event_users_delete()) or the time since the last call
  * into the event library is greater than the progress tick rate (by
  * default, 10ms).
+ *
+ * Returns 0 if no progress has been observed, non-zero otherwise.
  */
-OPAL_DECLSPEC void opal_progress(void);
+OPAL_DECLSPEC int opal_progress(void);
 
 /**
  * Control how the event library is called