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-rw-r--r--storage/xtradb/include/sync0rw.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/storage/xtradb/include/sync0rw.h b/storage/xtradb/include/sync0rw.h
index b02193add91..1df6a793637 100644
--- a/storage/xtradb/include/sync0rw.h
+++ b/storage/xtradb/include/sync0rw.h
@@ -40,6 +40,9 @@ Created 9/11/1995 Heikki Tuuri
#include "sync0sync.h"
#include "os0sync.h"
+/** Enable semaphore request instrumentation */
+extern my_bool srv_instrument_semaphores;
+
/* The following undef is to prevent a name conflict with a macro
in MySQL: */
#undef rw_lock_t