Author: Stefan Meyer-Kahlen
Date: 04:50:01 12/06/00
Go up one level in this thread
On December 05, 2000 at 21:24:16, Vincent Diepeveen wrote:
>On December 05, 2000 at 12:37:02, Bruce Moreland wrote:
>
>>On December 05, 2000 at 10:28:27, Vincent Diepeveen wrote:
>>
>>>this is not nonsense. blocking is GARANTUEED by windows.
>>>See the microsoft documents on it. they GARANTUEE blocking to
>>>prevent parallel problems.
>>
>>Are you telling me that if I get a mouse button click message from Windows, and
>>do something outrageously expensive before returning from that message, that my
>>engine threads will block until I return?
>>
>>bruce
>
>Argh damn it again i wrote something and i wrote it for nothing
>as IE4 forgot what i wrote somehow i hit some buttons and all
>my written text gone!
>
>Online writing is not my favourite thing!
>
>Anyway what you write here above is a generalization that doesn't
>apply always.
>
>What i did was next
>
> WndProc gets called as user clicks in pulldownwindow quit.
> then in wndproc i call function: killthecrap();
>
> void KillTheCrap(HWND hwnd, ..) {
> ..
> ..("Are you sure?");
> ..("Are you very sure?");
> ..("You really don't follow my advice?");
> ..
> SendToEngine(QuitEngine); /* now the engine
If this is done by PostMessage() you get a deadlock here as you are already in
the MainWndProc and the thread handling the Windows messages is blocked here!
Try SendMessage(), which might work but still I wouldn't like it.
A general rule might be to never block this MainWndProc thread.
Stefan
> gets a quit message. After it has processed it
> it ships acknowledgement to the enginethread
> that listens to the engine.
> The enginethread puts after getting acknowledgement
> the volatile variable quitengine to 1.
> then the enginethread quits.
>
> while(!quitengine) {
> ;
> }
>
> }
>
>Now my program was hung. I figured out that the enginethread
>was blocked as long as my program was still in the WndProc()
>
>This should be pretty easy to test at home.
>
>Greetings,
>Vincent
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