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DependentExtensions/cat/threads/Mutex.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_MUTEX_HPP
+#define CAT_MUTEX_HPP
+
+#include <cat/Platform.hpp>
+
+#if defined(CAT_OS_WINDOWS)
+# include <cat/port/WindowsInclude.hpp>
+#else // use POSIX mutex library otherwise
+# include <pthread.h>
+#endif
+
+namespace cat {
+
+
+// Implements a mutex that is NOT reentrant (for speed)
+class Mutex
+{
+#if defined(CAT_OS_WINDOWS)
+    CRITICAL_SECTION cs;
+#else
+	int init_failure;
+	pthread_mutex_t mx;
+#endif
+
+public:
+    Mutex();
+    ~Mutex();
+
+	bool Valid();
+
+    bool Enter();
+    bool Leave();
+};
+
+
+class AutoMutex
+{
+    Mutex *_mutex;
+
+public:
+    AutoMutex(Mutex &mutex);
+    ~AutoMutex();
+
+    bool Release();
+};
+
+
+} // namespace cat
+
+#endif // CAT_MUTEX_HPP