Re: GUI Locks with gthreads

[Daniel Miralles García <namarie oasi upc es>]

> Hi all

Hi! ;)

> I have a problem with my GUI and gthreads.

[...]

Check this:

>               g_mutex_lock(gmx);
>               if (zfin==0) {
>               {
>                               if (gmx != NULL)
>                               {

>                                       zini=g_timer_elapsed(zparo,NULL);
>                                       while(zini==0 && zfin==0)
>                                       {
>                                               zini=g_timer_elapsed(zparo,NULL);
>                                       }
>                                       g_timer_stop(zparo);
>                                       zini=0;
>                                       if(zfin==1)
>                                       {
>                                               self = g_thread_self();
>                                               g_mutex_unlock(gmx);
>                                               g_thread_exit(self);
>                                       }
>                               }
>               }
>               if(zfin==1)

<<< Why not an "else"? If you enter this one it's because you haven't 
entered into the other.

>               {
>                       g_mutex_unlock(gmx);
>                       g_thread_exit(self);
>               }
>               g_mutex_unlock(gmx);
>       }
> }

I'll suggest to make a simple "wait" for a few miliseconds, just to let 
the second process run a little. It's something I found in my 
multithreading program (maybe some Linux guru can help to this?)

When you have two threads that are into a "while(1)", you think they will 
run 1-2-1-1-2-1-2-2-2-1-1-2-1-2-1-2-1-1-2.... but the reality is 
"1-1-1-1-1-1-1-1-2-2-2-2-2-2-2-2-2-1-1-1-1-1-1". If you add a little wait 
(wait 20 miliseconds) just after the mutex_unlock, it will be 
1-2-1-2-1-2-1-2 (at least that's what it happens with my program).

By the way, who sets the Zfin flag to "1"? I haven't found. Is there a 
third thread? Are you using "zini" in 
zini=g_timer_elapsed(zparo,NULL);
when you want "zfin"?

.-:Namarie:-.