WaitForMultipleObjects 降低cpu

下面代碼通過WaitForMultipleObjects防止線程空跑，而降低了CPU

int push_packet(AVPacket* packet)
{

AVPacket* t_packet = (AVPacket*)av_malloc(sizeof(AVPacket));;
av_init_packet(t_packet);
int nRet = av_copy_packet(t_packet,packet);
if(nRet != 0)
{
av_free(t_packet);
t_packet = NULL;
LOG_THIS_INFO("av_copy_packet fail.");
return -1;
}

m_Mutex.lock();
m_list_packets.push_back(t_packet);
m_Mutex.unlock();
SetEvent(m_event);
return 0;
}

bCan  = true;

while(bCan)

{

.....

HANDLE events[2];

m_Mutex.lock();
events[0] = _cancel_flag;
events[1] = m_event;

m_Mutex.unlock();

DWORD events_cnt =2;

ResetEvent(m_event);
WaitForMultipleObjects(events_cnt,events,FALSE, INFINITE );
switch (dwEvent) 
{
case WAIT_OBJECT_0 + 0: /* to stop thread */ 
{
bCan = false;
}
break;
case WAIT_OBJECT_0 + 1:
{


}
break;
}

}