Activate thread support ... at least at the MPI level.

This commit was SVN r7386.

ompi/mpi/c/init_thread.c

@@ -36,6 +36,17 @@ int MPI_Init_thread(int *argc, char ***argv, int required,
     int err;
     MPI_Comm null = NULL;
 
+    /*
+     *   A thread compliant MPI implementation will be able to return provided
+     *   = MPI_THREAD_MULTIPLE. Such an implementation may always return provided
+     *   = MPI_THREAD_MULTIPLE, irrespective of the value of required.
+     */
+#if OMPI_ENABLE_MPI_THREADS
+    *provided = MPI_THREAD_MULTIPLE;
+#else
+    *provided = MPI_THREAD_SINGLE;
+#endif
+
     /* Ensure that we were not already initialized or finalized */
 
     if (ompi_mpi_finalized) {
@@ -55,5 +66,6 @@ int MPI_Init_thread(int *argc, char ***argv, int required,
     } else {
         err = ompi_mpi_init(0, NULL, required, provided);
     }
+    
     OMPI_ERRHANDLER_RETURN(err, null, err, FUNC_NAME);
 }