作者：未知 来源：月光软件站 加入时间：2005-2-28　月光软件站

// ---------------------------------实现文件---------------------------------//

#include "threadsafequeue.h"

CTreadSafeMsgQueue::CTreadSafeMsgQueue(int QueSize, USHORT InvalidMsgType)

{

         INVALID_MSG_TYPE = InvalidMsgType;

         MAX_QUE_SIZE = QueSize;

         m_Queue = NULL;

         m_HeaderToWrite = 0;

         m_TailToRead = 0;

         m_S_Producer = NULL;

         m_S_Consumer = NULL;

         m_E_Queue = NULL;

    m_WritingThreadNum = 0;

         m_ReadingThreadNum = 0;

         m_bStop =  FALSE;

         m_bInitedOK = TRUE;   // 注意

         if (QueSize > 0) m_Queue = new MsgItem [QueSize];

         m_bInitedOK &= (m_Queue != NULL);

         if (!m_bInitedOK) return;

         m_S_Producer = CreateSemaphore(NULL, MAX_QUE_SIZE, MAX_QUE_SIZE, NULL);

         m_bInitedOK &= (m_S_Producer != NULL);

         if (!m_bInitedOK) return;

         m_S_Consumer = CreateSemaphore(NULL, 0, MAX_QUE_SIZE, NULL);

         m_bInitedOK &= (m_S_Consumer != NULL);

         if (!m_bInitedOK) return;

         m_E_Queue = CreateEvent(NULL, FALSE, TRUE, NULL);

         m_bInitedOK &= (m_E_Queue != NULL);

}

 CTreadSafeMsgQueue::~CTreadSafeMsgQueue()

{

         // 防止新的线程进入

         m_bInitedOK = FALSE;

         // 如果Reset，等待Reset完成

         while (m_bStop) Sleep(SLEEP_TIME);

         // 等待至少一类线程（读线程或写线程）退出同步状态

    while ((m_WritingThreadNum != 0) && (m_ReadingThreadNum != 0)) Sleep(SLEEP_TIME);

         // 此时线程必定阻塞于信号量(Semaphore)状态

         // 释放写线程

         while (m_WritingThreadNum > 0)

         {

                   // 必须Sleep以出让CPU控制权

                  ReleaseSemaphore(m_S_Producer, 1, NULL);

                  Sleep(5);

         }

         // 释放读线程

         if (m_ReadingThreadNum > 0)

         {

                   for (int i = 0; i < MAX_QUE_SIZE; i++)

                   {

                            // 将待读取消息类型置为非法类型

                            m_Queue[m_TailToRead].MsgID = INVALID_MSG_TYPE;

                   }      

                   while (m_ReadingThreadNum > 0)

                   {

                            // 释放读线程

                            ReleaseSemaphore(m_S_Consumer, 1, NULL);

                            Sleep(5);                              

                   }

         }

         CloseHandle(m_S_Consumer);

         CloseHandle(m_S_Producer);

         CloseHandle(m_E_Queue);

         delete [] m_Queue;

}

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