OW_MutexLock.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2001-2004 Vintela, Inc. All rights reserved.
00003 *
00004 * Redistribution and use in source and binary forms, with or without
00005 * modification, are permitted provided that the following conditions are met:
00006 *
00007 *  - Redistributions of source code must retain the above copyright notice,
00008 *    this list of conditions and the following disclaimer.
00009 *
00010 *  - Redistributions in binary form must reproduce the above copyright notice,
00011 *    this list of conditions and the following disclaimer in the documentation
00012 *    and/or other materials provided with the distribution.
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00014 *  - Neither the name of Vintela, Inc. nor the names of its
00015 *    contributors may be used to endorse or promote products derived from this
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00018 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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00030 
00036 #ifndef OW_MUTEXLOCK_HPP_INCLUDE_GUARD_
00037 #define OW_MUTEXLOCK_HPP_INCLUDE_GUARD_
00038 #include "OW_config.h"
00039 #include "OW_Mutex.hpp"
00040 #include <cassert>
00041 
00042 namespace OW_NAMESPACE
00043 {
00044 
00046 class OW_COMMON_API MutexLock
00047 {
00048 public:
00049    explicit MutexLock(Mutex& mutex, bool initially_locked=true)
00050       : m_mutex(&mutex), m_locked(false)
00051    {
00052       if (initially_locked)
00053       {
00054          lock();
00055       }
00056    }
00057    ~MutexLock()
00058    {
00059       try
00060       {
00061          if (m_locked)
00062          {
00063             release();
00064          }
00065       }
00066       catch (...)
00067       {
00068          // don't let exceptions escape
00069       }
00070    }
00071    void lock()
00072    {
00073       assert(m_locked == false);
00074       m_mutex->acquire();
00075       m_locked = true;
00076    }
00077    void release()
00078    {
00079       assert(m_locked == true);
00080       m_mutex->release();
00081       m_locked = false;
00082    }
00083    MutexLock(const MutexLock& arg)
00084       : m_mutex(arg.m_mutex), m_locked(arg.m_locked)
00085    {
00086       arg.m_locked = false;
00087    }
00088    bool isLocked() const
00089    {
00090       return m_locked;
00091    }
00092 private:
00093    Mutex* m_mutex;
00094    mutable bool m_locked;
00095    friend class Condition;
00096 };
00097 
00098 } // end namespace OW_NAMESPACE
00099 
00100 #endif

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