[madplay]:audio_win32.c::struct buffer.event_handle: Can not find the time that sets the event object to the signaled state

1'st Init()
{
...
	  output[i].event_handle = CreateEvent(0, FALSE /* manual reset */,
		  FALSE /* initial state */, 0);
..
}
After this ,the event_handle is nonsignaled state.


but in function:

int wait(struct buffer *buffer)
{
   MMRESULT error;
   DWORD tick;

   if (!buffer->playing)
     return 0;

   tick = GetTickCount();
   switch (WaitForSingleObject(buffer->event_handle, INFINITE)) {
..
}

why the event_handle is signaled state?

I only find this time to setevent:
void CALLBACK callback(HWAVEOUT handle, UINT message, DWORD data,
		       DWORD param1, DWORD param2)
{
   WAVEHDR *header;
   struct buffer *buffer;

   switch (message) {
   case WOM_DONE:
     header = (WAVEHDR *) param1;
     buffer = (struct buffer *) header->dwUser;
     if (SetEvent(buffer->event_handle) == 0) {

...
}




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