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List:       kde-core-devel
Subject:    Re: Multithreading in KDE
From:       Waldo Bastian <bastian () suse ! de>
Date:       1999-10-31 13:12:52
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Hi Mirko,

In kdegraphics/katalog I also have a thread class around. I'm a bit
hesistant about promoting the use of threads though since debugging
threads is a pain in the ass and Qt's implicit sharing of various
objects (most notably QStrings) is a potential source of
race-conditions.

Cheers,
Waldo

On Sun, 24 Oct 1999, Mirko Sucker wrote:
> Hello all,
> 
> I uploaded the package kdethreads and the lsm to
> upload.kde.org/pub/kde/Incoming.
> Here is the lsm:
> 
> Begin3
> Title:          kdethreads
> Version:        prealpha
> Entered-date:   241099
> Description:    Multithreading classes K Desktop Environment (KDE)
> Keywords:       KDE X11 desktop Qt 
> Author:         mirko@kde.org (Mirko Sucker)
> Primary-site:   ftp://ftp.kde.org/pub/kde
> Alternate-site: 
> Platforms:      Unix, Qt
> Copying-policy: GPL
> End
> 
> The package contains a class to create threads. A test executable is included. 
> The package lacks the following: 
> 
> Currently, it is not possible to add  one special event to the event loop in a
> thread safe manner, as you cannot make sure that the event loop is not read
> while you are adding something. 
> 
> If this could be incorporated, we would have excellent API threading support in
> KDE. Every thread could inform the main thread at every time about its state.
> So, if anyone knows how to implement the following steps, please send a reply:
> ° Add event handlers for custom events (maybe virtual methods) that react on
>   thread notifications. 
> ° Trigger such a custom event from inside a thread by thread-safely appending it
>   to the event queue. 
> 
> This is all (really all) we need to create multi-threaded KDE applications,
> since the user interface itselfes should stay single-threaded to avoid
> hard-to-handle race conditions.
> 
> Matthias, did you copy?
> 
> Greetings,
> --Mirko.
> PS: Of course, this creates only the communication from the thread to the main
> thread. To communicate the other way, the Thread object is used. See the
> package...
> -- 
> Denn der  Mensch  liebt und ehrt den  Menschen,  solange er ihn
> nicht zu beurteilen vermag, und die Sehnsucht ist ein Erzeugnis
> mangelhafter Erkenntnis. (Thomas Mann)

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