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cs440-acg/ext/openexr/IlmBase/IlmThread/IlmThreadMutex.h

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2005-2012, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// 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 Industrial Light & Magic 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
+// OWNER 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 INCLUDED_ILM_THREAD_MUTEX_H
+#define INCLUDED_ILM_THREAD_MUTEX_H
+
+//-----------------------------------------------------------------------------
+//
+//	class Mutex, class Lock
+//
+//	Class Mutex is a wrapper for a system-dependent mutual exclusion
+//	mechanism.  Actual locking and unlocking of a Mutex object must
+//	be performed using an instance of a Lock (defined below).
+//
+//	Class lock provides safe locking and unlocking of mutexes even in
+//	the presence of C++ exceptions.  Constructing a Lock object locks
+//	the mutex; destroying the Lock unlocks the mutex.
+//
+//	Lock objects are not themselves thread-safe.  You should never
+//	share a Lock object among multiple threads.
+//
+//	Typical usage:
+//    
+//	    Mutex mtx;	// Create a Mutex object that is visible
+//	    		//to multiple threads
+//
+//	    ...		// create some threads
+//
+//	    // Then, within each thread, construct a critical section like so:
+//
+//	    {
+//		Lock lock (mtx);	// Lock constructor locks the mutex
+//		...			// do some computation on shared data
+//	    }				// leaving the block unlocks the mutex
+//
+//-----------------------------------------------------------------------------
+
+#include "IlmThreadExport.h"
+#include "IlmBaseConfig.h"
+#include "IlmThreadNamespace.h"
+
+#if defined _WIN32 || defined _WIN64
+    #ifdef NOMINMAX
+        #undef NOMINMAX
+    #endif
+    #define NOMINMAX
+    #include <windows.h>
+#elif HAVE_PTHREAD
+    #include <pthread.h>
+#endif
+
+ILMTHREAD_INTERNAL_NAMESPACE_HEADER_ENTER
+
+class Lock;
+
+
+class ILMTHREAD_EXPORT Mutex
+{
+  public:
+
+    Mutex ();
+    virtual ~Mutex ();
+
+  private:
+
+    void	lock () const;
+    void	unlock () const;
+
+    #if defined _WIN32 || defined _WIN64
+	mutable CRITICAL_SECTION _mutex;
+    #elif HAVE_PTHREAD
+	mutable pthread_mutex_t _mutex;
+    #endif
+
+    void operator = (const Mutex& M);	// not implemented
+    Mutex (const Mutex& M);		// not implemented
+    
+    friend class Lock;
+};
+
+
+class ILMTHREAD_EXPORT Lock
+{
+  public:
+
+    Lock (const Mutex& m, bool autoLock = true):
+	_mutex (m),
+	_locked (false)
+    {
+        if (autoLock)
+        {
+            _mutex.lock();
+            _locked = true;
+        }
+    }
+    
+    ~Lock ()
+    {
+        if (_locked)
+            _mutex.unlock();
+    }
+    
+    void acquire ()
+    {
+        _mutex.lock();
+        _locked = true;
+    }
+    
+    void release ()
+    {
+        _mutex.unlock();
+        _locked = false;
+    }
+    
+    bool locked ()
+    {
+        return _locked;
+    }
+
+  private:
+
+    const Mutex &	_mutex;
+    bool		_locked;
+};
+
+
+ILMTHREAD_INTERNAL_NAMESPACE_HEADER_EXIT
+
+#endif // INCLUDED_ILM_THREAD_MUTEX_H