1 files changed, 46 insertions, 0 deletions
diff --git a/include/mysql/service_thd_mdl.h b/include/mysql/service_thd_mdl.h
new file mode 100644
index 00000000..19b04769
--- /dev/null
+++ b/include/mysql/service_thd_mdl.h
@@ -0,0 +1,46 @@
+/* Copyright (c) 2019, MariaDB Corporation.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#pragma once
+
+/**
+  @file include/mysql/service_thd_mdl.h
+  This service provides functions for plugins and storage engines to access
+  metadata locks.
+*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+extern struct thd_mdl_service_st {
+  void *(*thd_mdl_context)(MYSQL_THD);
+} *thd_mdl_service;
+
+#ifdef MYSQL_DYNAMIC_PLUGIN
+# define thd_mdl_context(_THD) thd_mdl_service->thd_mdl_context(_THD)
+#else
+/**
+  MDL_context accessor
+  @param thd   the current session
+  @return pointer to thd->mdl_context
+*/
+void *thd_mdl_context(MYSQL_THD thd);
+#endif
+
+#ifdef __cplusplus
+}
+#endif