Add shared PthreadMutexLocker, an AutoLocker for pthread_mutex_t

headers/private/shared/PthreadMutexLocker.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2013, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Ingo Weinhold <ingo_weinhold@gmx.de>
+ */
+#ifndef _PTHREAD_MUTEX_LOCKER_H
+#define _PTHREAD_MUTEX_LOCKER_H
+
+
+#include <pthread.h>
+
+#include <AutoLocker.h>
+
+
+namespace BPrivate {
+
+
+class AutoLockerMutexLocking {
+public:
+	inline bool Lock(pthread_mutex_t* lockable)
+	{
+		return pthread_mutex_lock(lockable) == 0;
+	}
+
+	inline void Unlock(pthread_mutex_t* lockable)
+	{
+		pthread_mutex_unlock(lockable);
+	}
+};
+
+
+typedef AutoLocker<pthread_mutex_t, AutoLockerMutexLocking> PthreadMutexLocker;
+
+
+}	// namespace BPrivate
+
+using BPrivate::PthreadMutexLocker;
+
+
+#endif	// _PTHREAD_MUTEX_LOCKER_H