blocxx

MutexLock.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2005, Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2006, 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:
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00008 *     * Redistributions of source code must retain the above copyright notice,
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00014 *       Vintela, Inc., 
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00032 
00033 
00039 #ifndef BLOCXX_MUTEXLOCK_HPP_INCLUDE_GUARD_
00040 #define BLOCXX_MUTEXLOCK_HPP_INCLUDE_GUARD_
00041 #include "blocxx/BLOCXX_config.h"
00042 #include "blocxx/Mutex.hpp"
00043 #include <cassert>
00044 
00045 namespace BLOCXX_NAMESPACE
00046 {
00047 
00049 class BLOCXX_COMMON_API MutexLock
00050 {
00051 public:
00052    explicit MutexLock(Mutex& mutex, bool initially_locked=true)
00053       : m_mutex(&mutex), m_locked(false)
00054    {
00055       if (initially_locked)
00056       {
00057          lock();
00058       }
00059    }
00060    ~MutexLock()
00061    {
00062       try
00063       {
00064          if (m_locked)
00065          {
00066             release();
00067          }
00068       }
00069       catch (...)
00070       {
00071          // don't let exceptions escape
00072       }
00073    }
00074    void lock()
00075    {
00076       assert(m_locked == false);
00077       m_mutex->acquire();
00078       m_locked = true;
00079    }
00080    void release()
00081    {
00082       assert(m_locked == true);
00083       m_mutex->release();
00084       m_locked = false;
00085    }
00086    MutexLock(const MutexLock& arg)
00087       : m_mutex(arg.m_mutex), m_locked(arg.m_locked)
00088    {
00089       arg.m_locked = false;
00090    }
00091    bool isLocked() const
00092    {
00093       return m_locked;
00094    }
00095 private:
00096    Mutex* m_mutex;
00097    mutable bool m_locked;
00098    friend class Condition;
00099 };
00100 
00101 } // end namespace BLOCXX_NAMESPACE
00102 
00103 #endif