Re: Multithreaded GTK application

[G Hasse <gh raditex se>]

On Fri, Aug 20, 2004 at 05:58:17AM -0000, Akhil  Mehta wrote:
> Hi,
>
> I am developing a multi-threaded (pthreads) GUI application using GTK
> 2.0 library on Red Hat Linux 9.0. 

You should consider doing a non threaded application. The user interface
(in your case GTK) only want to be notified by "events" that comes from
lets say the keyboard, network layer or some *file discriptor*.

There is very good mechanisms in Unix to watch for evnets on file
descriptors.

select, poll or kernel queues

------------
man kqueue

DESCRIPTION
     The kqueue() system call provides a generic method of notifying the 
     user when an event happens or a condition holds, based on the 
     results of small pieces of kernel code termed filters.  A kevent is 
     identified by  the (ident, filter) pair; there may only be one 
     unique kevent per kqueue.

-----

Note that you must have a multicpu system to take advantage of
threads. (A theraded application is allways slower than an application
that runs as many processes - in a singel cpu system).
 

> Application has 3-4 GUI threads i.e. one window in each of the 3-4 GUI
> threads.

Why not devide your application into several processes. This is
easy to do! And the problem you have will "go away".

> I am putting gtk_main() in my main thread for GUI messages handling
> for all threads. Is there any way I can process GUI messages in each
> of the GUI thread?

If you organize your application differently this problem will not
arise.

> Can any one help me on this issue?

Please read "Advanced programming in the UNIX environment" by
Stevens. He have many answers. Ant the GTK program is just 
another process.

-- 
Göran Hasse

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