Merge "Call a specialized local map set."

    pthread_mutex_lock(&g_map_mutex);

    if (--g_map_references == 0) {

      // Clear the local address space map.

      unw_map_set(unw_local_addr_space, NULL);

      unw_map_local_set(NULL);

      unw_map_cursor_destroy(&map_cursor_);

    }

    pthread_mutex_unlock(&g_map_mutex);

    if (g_map_references == 0) {

      return_value = (unw_map_cursor_create(&map_cursor_, pid_) == 0);

      if (return_value) {

        // Set the local address space to this cursor map.

        unw_map_set(unw_local_addr_space, &map_cursor_);

        // Set the local address space map to our new map.

        unw_map_local_set(&map_cursor_);

        g_map_references = 1;

        g_map_cursor = map_cursor_;

      }