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DependentExtensions/cat/threads/RWLock.hpp

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+/*
+	Copyright (c) 2009-2010 Christopher A. Taylor.  All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are met:
+
+	* Redistributions of source code must retain the above copyright notice,
+	  this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above copyright notice,
+	  this list of conditions and the following disclaimer in the documentation
+	  and/or other materials provided with the distribution.
+	* Neither the name of LibCat nor the names of its contributors may be used
+	  to endorse or promote products derived from this software without
+	  specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+	ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+	POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef CAT_RW_LOCK_HPP
+#define CAT_RW_LOCK_HPP
+
+#include <cat/threads/Mutex.hpp>
+
+namespace cat {
+
+
+//// RWLock
+
+class RWLock
+{
+#if defined(CAT_OS_WINDOWS)
+	volatile u32 _rd_count;
+	volatile u32 _wr_count;
+	HANDLE _rd_event;
+	Mutex _wr_lock;
+#else
+	int init_failure;
+	pthread_rwlock_t rw;
+#endif
+
+public:
+	RWLock();
+	~RWLock();
+
+	void ReadLock();
+	void ReadUnlock();
+
+	void WriteLock();
+	void WriteUnlock();
+};
+
+
+//// AutoReadLock
+
+class AutoReadLock
+{
+	RWLock *_lock;
+
+public:
+	AutoReadLock(RWLock &lock);
+	~AutoReadLock();
+
+    bool Release();
+};
+
+
+//// AutoWriteLock
+
+class AutoWriteLock
+{
+	RWLock *_lock;
+
+public:
+	AutoWriteLock(RWLock &lock);
+	~AutoWriteLock();
+
+    bool Release();
+};
+
+
+} // namespace cat
+
+#endif // CAT_RW_LOCK_HPP