MutexLock.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2004 Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2005 Novell, Inc. All rights reserved.
00004 *
00005 * Redistribution and use in source and binary forms, with or without
00006 * modification, are permitted provided that the following conditions are met:
00007 *
00008 *  - Redistributions of source code must retain the above copyright notice,
00009 *    this list of conditions and the following disclaimer.
00010 *
00011 *  - Redistributions in binary form must reproduce the above copyright notice,
00012 *    this list of conditions and the following disclaimer in the documentation
00013 *    and/or other materials provided with the distribution.
00014 *
00015 *  - Neither the name of Vintela, Inc., Novell, Inc., nor the names of its
00016 *    contributors may be used to endorse or promote products derived from this
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00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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00031 
00032 
00038 #ifndef BLOCXX_MUTEXLOCK_HPP_INCLUDE_GUARD_
00039 #define BLOCXX_MUTEXLOCK_HPP_INCLUDE_GUARD_
00040 #include "blocxx/BLOCXX_config.h"
00041 #include "blocxx/Mutex.hpp"
00042 #include <cassert>
00043 
00044 namespace BLOCXX_NAMESPACE
00045 {
00046 
00048 class BLOCXX_COMMON_API MutexLock
00049 {
00050 public:
00051    explicit MutexLock(Mutex& mutex, bool initially_locked=true)
00052       : m_mutex(&mutex), m_locked(false)
00053    {
00054       if (initially_locked)
00055       {
00056          lock();
00057       }
00058    }
00059    ~MutexLock()
00060    {
00061       try
00062       {
00063          if (m_locked)
00064          {
00065             release();
00066          }
00067       }
00068       catch (...)
00069       {
00070          // don't let exceptions escape
00071       }
00072    }
00073    void lock()
00074    {
00075       assert(m_locked == false);
00076       m_mutex->acquire();
00077       m_locked = true;
00078    }
00079    void release()
00080    {
00081       assert(m_locked == true);
00082       m_mutex->release();
00083       m_locked = false;
00084    }
00085    MutexLock(const MutexLock& arg)
00086       : m_mutex(arg.m_mutex), m_locked(arg.m_locked)
00087    {
00088       arg.m_locked = false;
00089    }
00090    bool isLocked() const
00091    {
00092       return m_locked;
00093    }
00094 private:
00095    Mutex* m_mutex;
00096    mutable bool m_locked;
00097    friend class Condition;
00098 };
00099 
00100 } // end namespace BLOCXX_NAMESPACE
00101 
00102 #endif

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