SleepConditionVariableSRW线程最佳同步实现

     1  几个关键函数   

     

//条件休眠线程  BOOL  SleepConditionVariableSRW (          PCONDITION_VARIABLE ConditionVariable,          PSRWLOCK SRWLock,          DWORD dwMilliseconds,          ULONG Flags);    // 唤醒一个等待条件变量的线程  VOID  WakeConditionVariable (PCONDITION_VARIABLE ConditionVariable);    // 唤醒所有等待条件变量的线程  VOID  WakeAllConditionVariable (PCONDITION_VARIABLE ConditionVariable)

 2  样例
     2.1  三个变量

     

      BOOL RUNNING=FALSE;                 SRWLOCK  g_srwlock;         //读写同步对象        CONDITION_VARIABLE g_full;  //条件变量  

     2.2  线程

UINT ThreadFun(LPVOID)  {      AfxMessageBox(TEXT("Thread IS BEGINNING"));        /*     1)启动线程前执行     AcquireSRWLockExclusive(&g_srwlock);     可以阻止线程继续执行，     如果想让线程继续，只需执行     ReleaseSRWLockExclusive(&g_srwlock);         */         /*     2)通过布尔变量判断，利用条件休眠可以阻止线程继续      如果想让线程继续，只需执行      WakeAllConditionVariable(&g_full);     */         AcquireSRWLockExclusive(&g_srwlock);           if (RUNNING==FALSE)                     SleepConditionVariableSRW(&g_full, &g_srwlock, INFINITE, 0);            AfxMessageBox(TEXT("Thread is continue"));            for(int i=0;i<100;++i) { Sleep(50);}             ReleaseSRWLockExclusive(&g_srwlock);            AfxMessageBox(TEXT("Thread IS OVER"));            return 1;       }  

      2.3  启动线程并休眠

      InitializeSRWLock(&g_srwlock);          //AcquireSRWLockExclusive(&g_srwlock);          AfxBeginThread(ThreadFun,NULL);  

      2.4  唤醒线程继续执行

       //1)  //ReleaseSRWLockExclusive(&g_srwlock);    WakeAllConditionVariable(&g_full);