Semaphore.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.
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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
00017 *    software without specific prior written permission.
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00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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00031 
00032 
00037 #ifndef BLOCXX_SEMAPHORE_HPP_INCLUDE_GUARD_
00038 #define BLOCXX_SEMAPHORE_HPP_INCLUDE_GUARD_
00039 #include "blocxx/BLOCXX_config.h"
00040 #include "blocxx/Types.hpp"
00041 #include "blocxx/NonRecursiveMutex.hpp"
00042 #include "blocxx/Condition.hpp"
00043 #include "blocxx/NonRecursiveMutexLock.hpp"
00044 
00045 namespace BLOCXX_NAMESPACE
00046 {
00047 // TODO: uninline this class.
00048 class Semaphore
00049 {
00050 public:
00051    Semaphore()
00052       : m_curCount(0)
00053    {}
00054    Semaphore(Int32 initCount)
00055       : m_curCount(initCount)
00056    {}
00057    void wait()
00058    {
00059       NonRecursiveMutexLock l(m_mutex);
00060       while (m_curCount <= 0)
00061       {
00062          m_cond.wait(l);
00063       }
00064       --m_curCount;
00065    }
00066    bool timedWait(UInt32 sTimeout, UInt32 usTimeout=0)
00067    {
00068       bool ret = true;
00069       NonRecursiveMutexLock l(m_mutex);
00070       while (m_curCount <= 0 && ret == true)
00071       {
00072          ret = m_cond.timedWait(l, sTimeout, usTimeout);
00073       }
00074       if (ret == true)
00075       {
00076          --m_curCount;
00077       }
00078       return ret;
00079    }
00080    void signal()
00081    {
00082       NonRecursiveMutexLock l(m_mutex);
00083       ++m_curCount;
00084       m_cond.notifyAll();
00085    }
00086    Int32 getCount()
00087    {
00088       NonRecursiveMutexLock l(m_mutex);
00089       return m_curCount;
00090    }
00091 private:
00092    Int32 m_curCount;
00093    Condition m_cond;
00094    NonRecursiveMutex m_mutex;
00095    // noncopyable
00096    Semaphore(const Semaphore&);
00097    Semaphore& operator=(const Semaphore&);
00098 };
00099 
00100 } // end namespace BLOCXX_NAMESPACE
00101 
00102 #endif

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