[Bug 19713] Some serial port communication functions behave differently in Wine and Windows.

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=19713





--- Comment #5 from Alexander Varnin <fenixk19 at mail.ru>  2009-08-13 13:36:31 ---
(In reply to comment #4)
> Are you sure this isn't a race condition?  You create the event as an
> auto-reset event, that is, with bManualReset = FALSE:
>     ovOverlapped.hEvent = CreateEvent(NULL, FALSE/*TRUE*/, FALSE, NULL);
> 
> From MSDN's remarks section on GetOverlappedResult:
> 
> Specify a manual-reset event object in the OVERLAPPED structure. If an
> auto-reset event object is used, the event handle must not be specified in any
> other wait operation in the interval between starting the overlapped operation
> and the call to GetOverlappedResult. For example, the event object is sometimes
> specified in one of the wait functions to wait for the operation's completion.
> When the wait function returns, the system sets an auto-reset event's state to
> nonsignaled, and a subsequent call to GetOverlappedResult with the bWait
> parameter set to TRUE causes the function to be blocked indefinitely.
> 
> And this is what you do:  you call WaitForSingleEvent on the event until it's
> signalled, then call GetOverlappedResult on it:
>                  while (dwResult = WaitForSingleObject(ovOverlapped.hEvent, 50)
> == WAIT_TIMEOUT)
> (snip)
>                         if (!(bOvResult = GetOverlappedResult(hSerial,
> &ovOverlapped, &dwOvRes, TRUE)))
> 
> I'm curious why you commented out /*TRUE*/ when you created the event.  Based
> on MSDN's comments, I think some more testing on more than one Windows version
> and with more than one serial driver would be in order before concluding that
> Windows *always* behaves this way.

It was not me, who have written this code. I've cut it from my colleague
program. The problem is, that part our well-working windows software doesn't
want to work on wine. It is very strange, that this code works in other way,
than written in MSDN.

Now i've tried to replace FALSE with TRUE. Now, it passes Checkpoint 2, but
comes to Checkpoint 3, while windows is coming to Checkpoint 4. It still
behaves differently. I'm not sure that it is bug, but it is incompability. What
policy do wine developer keep to?

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