1 files changed, 47 insertions, 0 deletions
diff --git a/mysql/mutex_lock.h b/mysql/mutex_lock.h
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+/* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+
+   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 02110-1301  USA */
+
+#ifndef MUTEX_LOCK_INCLUDED
+#define MUTEX_LOCK_INCLUDED
+
+#include <my_global.h>
+#include <mysql/psi/mysql_thread.h>
+
+/**
+  A simple wrapper around a mutex:
+  Grabs the mutex in the CTOR, releases it in the DTOR.
+  The mutex may be NULL, in which case this is a no-op.
+*/
+class Mutex_lock
+{
+public:
+  explicit Mutex_lock(mysql_mutex_t *mutex) : m_mutex(mutex)
+  {
+    if (m_mutex)
+      mysql_mutex_lock(m_mutex);
+  }
+  ~Mutex_lock()
+  {
+    if (m_mutex)
+      mysql_mutex_unlock(m_mutex);
+  }
+private:
+  mysql_mutex_t *m_mutex;
+
+  Mutex_lock(const Mutex_lock&);                /* Not copyable. */
+  void operator=(const Mutex_lock&);            /* Not assignable. */
+};
+
+#endif  // MUTEX_LOCK_INCLUDED