WaitForSingleObject 总是返回 WAIT_OBJECT_0

Question

I don't set the event signaled, but the WaitForSingleObject always returned. I create a event in the main thread.

g_hHeartMonitorEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

Then in another thread, I use WaitForSingleObject to wait the event signaled.

`

while(true)
{
    DWORD dwResult = WaitForSingleObject(lpThis->g_hHeartMonitorEvent, 90 * 1000);
    if (WAIT_OBJECT_0 == dwResult)
    {
        LogWriteEx("WaitForSingleObject：dwResult = WAIT_OBJECT_0");
        continue;
    }
}

`

I find that WaitForSingleObject always returns WAIT_OBJECT_0. The setevent only is called in one place. The machine has a single-core CPU.

Answer 1

如果由于某种未知原因关闭了事件句柄，则会发生这种情况。