ACE_Semaphore信号量生产着消费者队列

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这个信号量机制在win32和linux上都支持，没有什么特别的感觉。直接上Demo如下，这个Demo也是经典的生产者消费者的实现： [cpp] view plaincopy// thread_semaphore.cpp    #include "ace/Task.h"  #include "ace/Semaphore.h"      class Consumer:public ACE_Task <ACE_MT_SYNCH>  {  public:   enum{ N_THREADS = 5 };     Consumer(ACE_Semaphore& psema, ACE_Semaphore& csema):m_psema(psema), m_csema(csema), m_exitCondition(0)   {}     int isClose()   {    return m_exitCondition;   }     int svc(void)   {    while (!isClose())    {     consumeItem();    }    return 0;   }       void consumeItem()   {    m_csema.acquire();    if (!isClose())    {     ACE_Message_Block *mb;     this->getq(mb);     if (mb->msg_type() == ACE_Message_Block::MB_HANGUP)     {      shutdown();      mb->release();      return;     }     else     {      ACE_DEBUG((LM_DEBUG, ACE_TEXT("(%t) Consumed %d \n"), *((int *)mb->rd_ptr())));      mb->release();     }     m_psema.release();    }   }     void shutdown(void)   {    m_exitCondition = 1;    this->msg_queue()->deactivate();    m_csema.release(N_THREADS);   }    private:   ACE_Semaphore& m_psema;   ACE_Semaphore& m_csema;   int m_exitCondition;    };    class Producer:public ACE_Task_Base  {  public:   enum{MAX_PROD = 128};     Producer(ACE_Semaphore &psema, ACE_Semaphore &csema, Consumer &consumer)    :m_psema(psema), m_csema(csema), m_consumer(consumer)   {}     void producItem(int item)   {    m_psema.acquire();    ACE_Message_Block *mb = new ACE_Message_Block(sizeof(int),ACE_Message_Block::MB_DATA);    ACE_OS::memcpy(mb->wr_ptr(), &item, sizeof(item));    mb->wr_ptr(sizeof(int));    this->m_consumer.putq(mb);      ACE_DEBUG((LM_DEBUG, ACE_TEXT("(%t) Prodeced %d\n"), item));    m_csema.release();   }     int svc(void)   {    for (int i=0; i<=MAX_PROD; i++)    {     producItem(i);    }    hangUp();    return 0;   }     void hangUp()   {    m_psema.acquire();    ACE_Message_Block *mb = new ACE_Message_Block(0, ACE_Message_Block::MB_HANGUP);    this->m_consumer.putq(mb);    m_csema.release();   }    private:   ACE_Semaphore& m_psema;   ACE_Semaphore& m_csema;   Consumer& m_consumer;  };         int ACE_TMAIN(int, ACE_TCHAR *[])  {   ACE_Semaphore psem(5);   ACE_Semaphore csem(0);     Consumer consumer(psem, csem);   Producer producer(psem, csem, consumer);     producer.activate();   consumer.activate(THR_NEW_LWP | THR_JOINABLE, Consumer::N_THREADS);     producer.wait();   consumer.wait();     return 0;  };
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