OW_Semaphore.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.
00013 *
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
00016 *    software without specific prior written permission.
00017 *
00018 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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00030 
00035 #ifndef OW_SEMAPHORE_HPP_INCLUDE_GUARD_
00036 #define OW_SEMAPHORE_HPP_INCLUDE_GUARD_
00037 #include "OW_config.h"
00038 #include "OW_Types.hpp"
00039 #include "OW_NonRecursiveMutex.hpp"
00040 #include "OW_Condition.hpp"
00041 #include "OW_NonRecursiveMutexLock.hpp"
00042 
00043 namespace OW_NAMESPACE
00044 {
00045 // TODO: uninline this class.
00046 class Semaphore
00047 {
00048 public:
00049    Semaphore()
00050       : m_curCount(0)
00051    {}
00052    Semaphore(Int32 initCount)
00053       : m_curCount(initCount)
00054    {}
00055    void wait()
00056    {
00057       NonRecursiveMutexLock l(m_mutex);
00058       while (m_curCount <= 0)
00059       {
00060          m_cond.wait(l);
00061       }
00062       --m_curCount;
00063    }
00064    bool timedWait(UInt32 sTimeout, UInt32 usTimeout=0)
00065    {
00066       bool ret = true;
00067       NonRecursiveMutexLock l(m_mutex);
00068       while (m_curCount <= 0 && ret == true)
00069       {
00070          ret = m_cond.timedWait(l, sTimeout, usTimeout);
00071       }
00072       if (ret == true)
00073       {
00074          --m_curCount;
00075       }
00076       return ret;
00077    }
00078    void signal()
00079    {
00080       NonRecursiveMutexLock l(m_mutex);
00081       ++m_curCount;
00082       m_cond.notifyAll();
00083    }
00084    Int32 getCount()
00085    {
00086       NonRecursiveMutexLock l(m_mutex);
00087       return m_curCount;
00088    }
00089 private:
00090    Int32 m_curCount;
00091    Condition m_cond;
00092    NonRecursiveMutex m_mutex;
00093    // noncopyable
00094    Semaphore(const Semaphore&);
00095    Semaphore& operator=(const Semaphore&);
00096 };
00097 
00098 } // end namespace OW_NAMESPACE
00099 
00100 #endif

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