CAConditionVariable.hpp

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/*
Copyright (c) 2000, The JAP-Team 
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

  - Redistributions of source code must retain the above copyright notice, 
    this list of conditions and the following disclaimer.

  - Redistributions in binary form must reproduce the above copyright notice, 
    this list of conditions and the following disclaimer in the documentation and/or 
    other materials provided with the distribution.

  - Neither the name of the University of Technology Dresden, Germany nor the names of its contributors 
    may be used to endorse or promote products derived from this software without specific 
    prior written permission. 

  
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS 
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
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*/
#ifndef __CACONVAR__
#define __CACONVAR__
#ifndef ONLY_LOCAL_PROXY

#include "CAMutex.hpp"
#include "CAUtil.hpp"
#include "CASemaphore.hpp"

class CAConditionVariable:public CAMutex
  {
    public:
      CAConditionVariable()
        {
          #ifdef HAVE_PTHREAD_CV
            m_pCondVar=new pthread_cond_t;
            pthread_cond_init(m_pCondVar,NULL);
          #else
            m_pMutex=new CAMutex();
            m_pSemaphore=new CASemaphore(0);
            m_iSleepers=0;
          #endif
        }

      ~CAConditionVariable()
        {
          #ifdef HAVE_PTHREAD_CV
            pthread_cond_destroy(m_pCondVar);
            delete m_pCondVar;
            m_pCondVar = NULL;
          #else
            delete m_pMutex;
            m_pMutex = NULL;
            delete m_pSemaphore;
            m_pSemaphore = NULL;
          #endif
        }
      
      SINT32 wait()
        {
          #ifdef HAVE_PTHREAD_CV
            if(pthread_cond_wait(m_pCondVar,m_pMutex)==0)
              return E_SUCCESS;
            return E_UNKNOWN;
          #else
            m_pMutex->lock();
            unlock(); // Release the lock that is associated with our cv
            m_iSleepers++;
            m_pMutex->unlock();
            m_pSemaphore->down();
            return lock();
          #endif
        }

      SINT32 wait(CAMutex& oMutex)
        {
          #ifdef HAVE_PTHREAD_CV
            if(pthread_cond_wait(m_pCondVar,oMutex.m_pMutex)==0)
              return E_SUCCESS;
            return E_UNKNOWN;
          #else
            m_pMutex->lock();
            oMutex.unlock(); // Release the lock that is associated with our cv
            m_iSleepers++;
            m_pMutex->unlock();
            m_pSemaphore->down();
            return oMutex.lock();
          #endif
        }

      SINT32 wait(CAMutex* pMutex)
        {
          #ifdef HAVE_PTHREAD_CV
            if(pthread_cond_wait(m_pCondVar,pMutex->m_pMutex)==0)
              return E_SUCCESS;
            return E_UNKNOWN;
          #else
            m_pMutex->lock();
            pMutex->unlock(); // Release the lock that is associated with our cv
            m_iSleepers++;
            m_pMutex->unlock();
            m_pSemaphore->down();
            return pMutex->lock();
          #endif
        }
  
      SINT32 wait(UINT32 msTimeout)
        {
          #ifdef HAVE_PTHREAD_CV
            timespec to;
            getcurrentTime(to);
            to.tv_nsec+=(msTimeout%1000)*1000000;
            to.tv_sec+=msTimeout/1000;
            if(to.tv_nsec>999999999)
              {
                to.tv_sec++;
                to.tv_nsec-=1000000000;
              }
            int ret=pthread_cond_timedwait(m_pCondVar,m_pMutex,&to);
            if(ret==0)
              return E_SUCCESS;
            else if(ret==ETIMEDOUT)
              return E_TIMEDOUT;
            return E_UNKNOWN;
          #else
            return wait();
          #endif
        }

      SINT32 signal()
        {
          #ifdef HAVE_PTHREAD_CV
            if(pthread_cond_signal(m_pCondVar)==0)
              return E_SUCCESS;
            return E_UNKNOWN;
          #else
            m_pMutex->lock();
            if( m_iSleepers > 0 )
              {
                m_pSemaphore->up();
                m_iSleepers--;
              }
            return m_pMutex->unlock();
          #endif
        }

      SINT32 broadcast()
        {
          #ifdef HAVE_PTHREAD_CV
            if(pthread_cond_broadcast(m_pCondVar)==0)
              return E_SUCCESS;
            return E_UNKNOWN;
          #else
            m_pMutex->lock();
            while( m_iSleepers > 0 )
              {
                m_pSemaphore->up();
                m_iSleepers--;
              }
            return m_pMutex->unlock();
          #endif
        }

    private:
        #ifdef HAVE_PTHREAD_CV
          pthread_cond_t* m_pCondVar;
        #else
          CAMutex* m_pMutex;
          CASemaphore* m_pSemaphore;
          UINT32 m_iSleepers;
        #endif
  };
#endif
#endif //ONLY_LOCAL_PROXY

---