Re: Gtk and Threads...

[Brad House <brad mainstreetsoftworks com>]

Well, communicating between threads is generally simple.  Set a
variable or something like
int write_graph=0;
and set it to 1 when you want the other thread to update it's graph.
Then set it back to 0 when the thread is done writing the graph.

Now where you're probably getting confused is here.  You won't
have 2 processes, you'll have 3.
1) Main process that runs gtk_main();
2) Computation thread
3) drawing thread.

You'll need to make sure you do a
g_thread_init(NULL); before your call to gtk_init

Then to call gtk_main() do this:
gdk_threads_enter();
gtk_main();
gdk_threads_leave();

Finally,
in your drawing thread, you'll need to call gdk_threads_enter()
before you draw, and gdk_threads_leave() after.  Make sure you
do this!  Also, you may have to call gdk_flush() before you call
gdk_threads_leave().

I hopw this helps.

-Brad

Dany Mezher wrote:

>     Hello,
>
>     I am writing a numerical application using GTK. I have two threads
> in my application; one to do the comutations and the other to do the
> graphics and I want to plot the computed values on the fly. How can the
> computation thread tell the graphics thread that it can do some graphs??
>
> Regards
> Dany
>
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