1 files changed, 22 insertions, 1 deletions
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 5a4af9afbb1..5c5957e7871 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -1447,7 +1447,28 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
     if (check_global_access(thd,RELOAD_ACL))
       break;
     general_log_print(thd, command, NullS);
-    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
+#ifndef DBUG_OFF
+    bool debug_simulate= FALSE;
+    DBUG_EXECUTE_IF("simulate_detached_thread_refresh", debug_simulate= TRUE;);
+    if (debug_simulate)
+    {
+      /*
+        Simulate a reload without a attached thread session.
+        Provides a environment similar to that of when the
+        server receives a SIGHUP signal and reloads caches
+        and flushes tables.
+      */
+      bool res;
+      my_pthread_setspecific_ptr(THR_THD, NULL);
+      res= reload_acl_and_cache(NULL, options | REFRESH_FAST,
+                                NULL, &not_used);
+      my_pthread_setspecific_ptr(THR_THD, thd);
+      if (!res)
+        my_ok(thd);
+      break;
+    }
+#endif
+    if (!reload_acl_and_cache(thd, options, NULL, &not_used))
       my_ok(thd);
     break;
   }