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List:       kde-core-devel
Subject:    Re: Idea for making threads easier
From:       Roberto Alsina <ralsina () unl ! edu ! ar>
Date:       2000-03-07 12:28:40
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On Tue, 7 Mar 2000, Rik Hemsley wrote:

> The QpThread library (not related to Qt) provides a pthread wrapper
> with an API similar to that of Java.
> 
> Here's an example of how you write a 'thread' with QpThread:
> 
> class MyThread : public QpThread
> {
>   public:
>     MyThread()  : QpThread() { }
>     ~MyThread() { Join(); }
>     void Main() { /* Do some work */ }
> };
> 
> This could give us a great way of handling threads in KDE apps.
> 
> e.g.
> 
> Pixie::ThumbView::refresh()
> {
>   ThumbGenerator t(this);
>   t.Start();
> }
> 
> Problem:  Qt gets very upset if you aren't careful to separate your
>           code. The above example simply crashes Qt. You have to
>           remove all Qt-related code from your thread and communicate
>           over pipes.
> 
> Solution: Adapt QpThread to use the pthread emulation of Pth.
> 
> I've managed to _compile_ QpThread for Pth.
> 
> This involved adding a few #defines to avoid including certain system
> headers, something which is advised by Pth.
> 
> The way I've done it is just a quick hack, so someone who knows more
> could do it cleanly.
> 
> Most of the QpThread examples seem to run OK but my limited knowledge
> w.r.t. threading issues in general prevents me getting much further
> on my own.
> 
> I *think* Qt would perhaps have to be linked to Pth's version of
> libpthread and compiled with thread support, otherwise it would
> block in select...  but I'm just guessing.

Well, you can do the QMTApplication thing I explained in my Qt/Pth howto
:-)

> Any thoughts ?

It looks cool. I am not familiar with QpThread, but I will take a look as
soon as possible!

 ("\''/").__..-''"`-. .         Roberto Alsina
 `9_ 9  )   `-. (    ).`-._.`)  ralsina@unl.edu.ar
 (_Y_.)' ._   ) `._`.  " -.-'   Centro de Telematica
  _..`-'_..-_/ /-'_.'           Universidad Nacional del Litoral
(l)-'' ((i).' ((!.'             Santa Fe - Argentina
                                KDE Developer (MFCH)
The stone age didn't end for a lack of stone" Firoz Rasul

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