WaitForSingleObject

    DWORD dwFlag = ::WaitForSingleObject(m_threadEvents[0], 0) ;
    switch (dwFlag)
    {
    case WAIT_OBJECT_0: 
        break;
    case WAIT_TIMEOUT:
        {
            ::SetEvent(m_threadEvents[0]) ;
        }
        break;
    default:
        RC_ASSERT(false);
        return RC_S_FALSE ;
    }

1.有信号进入WAIT_OBJECT_0

2.没信号进入WAIT_TIMEOUT