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List:       kde-devel
Subject:    Re: Execution replay for Qt/KDE applications
From:       "Oliver Oppitz" <o.oppitz () web ! de>
Date:       2004-10-22 11:57:45
Message-ID: opsf9sujspli378s () smtp ! web ! de
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  Date: Thu, 21 Oct 2004 21:43:53 +0200
From: David Faure <faure@kde.org>
Subject: Re: Execution replay for Qt/KDE applications
To: kde-devel@kde.org
Message-ID: <200410212143.55441.faure@kde.org>
Content-Type: text/plain;  charset="utf-8"

> On 21 Oct 2004 09:19:46 -0000, <kde-devel-request@mail.kde.org> wrote:
> There is no such doOtherThings() thing in the Qt event loop.
> The event loop waits for events.
Ok, there's a better sample:

"Another Look at Events", by Jasmin Blanchette
http://doc.trolltech.com/qq/qq11-events.html :

"Conceptually, the event loop looks like this:

    while (!exit_was_called) {
         while (!posted_event_queue_is_empty) {  //LOOP A
             process_next_posted_event();
         }
         while (!spontaneous_event_queue_is_empty) { // LOOP B
             process_next_spontaneous_event();
         }
         while (!posted_event_queue_is_empty) {  // LOOP C
             process_next_posted_event();
         }
     }
"

The code sample illustrates the point better. Depending on the timing a  
posted event will either be handled in Loop A or Loop C. And in between A  
and C, the spontaneous event handlers will execute and modify the state of  
the application. Therefore the timing when to post an event does matter...

   Regards, oliver

PS:  Formally doOtherThings() can do "anything", even handling events like  
Loop B, C... But I have to admit my example was not good, probably  
misleading even.
-- 

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