辅助线程安全退出

在日常中，我们经常需要用到辅助线程，那么在程序退出时一定要先保证辅助线程已安全退出，因为在程序销毁时很多资源也被销毁掉了，那么如果这时辅助线程要用到某些资源已不存在了，就可能发生不可预料的后果（一般是程序崩溃）。怎么让辅助线程安全退出呢？直接贴代码吧：

成员变量/线程函数声明:

HANDLE                  m_hThread;
HANDLE			m_hThreadEvent[2];
static DWORD WINAPI Thread(LPVOID lpvoid);

OnInitDialog中初始化:

m_hThreadEvent[0] = CreateEvent(NULL, FALSE, FALSE, NULL); //  event
m_hThreadEvent[1] = CreateEvent(NULL, FALSE, FALSE, NULL); // exit event
m_hThread = CreateThread(NULL, 0, Thread, this, 0, NULL);

辅助线程主体:

DWORD WINAPI XXX::Thread(LPVOID lpvoid)
{
CCCDateTimeDemoDlg *pthis = (CCCDateTimeDemoDlg*)lpvoid;
BOOL  bContinue = TRUE;
DWORD dwRes = 0;
while (bContinue)
{
dwRes = WaitForMultipleObjects(2,pthis->m_hThreadEvent, FALSE, INFINITE);
switch (dwRes)
{
case WAIT_OBJECT_0:
{
//做你需要的操作
}
break;
case WAIT_OBJECT_0 + 1:
{
bContinue = FALSE;
}
break;
default:
{
bContinue = FALSE;
}
break;
}
}
return 0;
}

退出时设置退出信号，等待

SetEvent(m_hThreadEvent[1]);//设置退出信号量
WaitForSingleObject(m_hThread, INFINITE);
CloseHandle(m_hThread);
CloseHandle(m_hThreadEvent[0]);
CloseHandle(m_hThreadEvent[1]);

原因：m_hThread只有在辅助线程退出后才能变得有信号.