refs codership/mysql-wsrep#233

- added dbug sync points for further mtr test for this issue

1 files changed, 10 insertions, 0 deletions

diff --git a/sql/mdl.cc b/sql/mdl.cc
index 44831c55b44..2aef46a4fa5 100644
--- a/sql/mdl.cc
+++ b/sql/mdl.cc
@@ -24,6 +24,7 @@
 #include <mysql/psi/mysql_stage.h>
 
 #ifdef WITH_WSREP
+#include "debug_sync.h"
 #include "wsrep_mysqld.h"
 #include "wsrep_thd.h"
 extern "C" my_thread_id wsrep_thd_thread_id(THD *thd);
@@ -1445,6 +1446,15 @@ MDL_wait::timed_wait(MDL_context_owner *owner, struct timespec *abs_timeout,
          wait_result != ETIMEDOUT && wait_result != ETIME)
   {
 #ifdef WITH_WSREP
+    // Allow tests to block the applier thread using the DBUG facilities
+    DBUG_EXECUTE_IF("sync.wsrep_before_mdl_wait",
+                 {
+                   const char act[]=
+                     "now "
+                     "wait_for signal.wsrep_before_mdl_wait";
+                   DBUG_ASSERT(!debug_sync_set_action((owner->get_thd()),
+                                                      STRING_WITH_LEN(act)));
+                 };);
     if (wsrep_thd_is_BF(owner->get_thd(), true))
     {
       wait_result= mysql_cond_wait(&m_COND_wait_status, &m_LOCK_wait_status);