blocxx

NonRecursiveMutexLock.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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00032 
00033 
00038 #ifndef BLOCXX_NON_RECURSIVE_MUTEXLOCK_HPP_INCLUDE_GUARD_
00039 #define BLOCXX_NON_RECURSIVE_MUTEXLOCK_HPP_INCLUDE_GUARD_
00040 #include "blocxx/BLOCXX_config.h"
00041 #include "blocxx/NonRecursiveMutex.hpp"
00042 #include <cassert>
00043 
00044 namespace BLOCXX_NAMESPACE
00045 {
00046 
00048 
00052 class BLOCXX_COMMON_API NonRecursiveMutexLock
00053 {
00054 public:
00058    explicit NonRecursiveMutexLock(NonRecursiveMutex& mutex, bool initially_locked=true)
00059       : m_mutex(&mutex), m_locked(false)
00060    {
00061       if (initially_locked)
00062       {
00063          lock();
00064       }
00065    }
00066    ~NonRecursiveMutexLock()
00067    {
00068       try
00069       {
00070          if (m_locked)
00071          {
00072             release();
00073          }
00074       }
00075       catch (...)
00076       {
00077          // don't let exceptions escape
00078       }
00079    }
00084    void lock()
00085    {
00086       assert(m_locked == false);
00087       m_mutex->acquire();
00088       m_locked = true;
00089    }
00094    void release()
00095    {
00096       assert(m_locked == true);
00097       m_mutex->release();
00098       m_locked = false;
00099    }
00103    NonRecursiveMutexLock(const NonRecursiveMutexLock& arg)
00104       : m_mutex(arg.m_mutex), m_locked(arg.m_locked)
00105    {
00106       arg.m_locked = false;
00107    }
00111    bool isLocked() const
00112    {
00113       return m_locked;
00114    }
00115    /*
00116    NonRecursiveMutexLock& operator= (const NonRecursiveMutexLock& arg)
00117    {
00118       release();
00119       m_locked = arg.m_locked;
00120       m_mutex = arg.m_mutex;
00121       arg.m_locked = false;
00122       return *this;
00123    }
00124    */
00125 private:
00126    NonRecursiveMutex* m_mutex;
00127    mutable bool m_locked;
00128    friend class Condition;
00129 };
00130 
00131 } // end namespace BLOCXX_NAMESPACE
00132 
00133 #endif