Re: quetion about gtk_input_add()

[Tristan Van Berkom <vantr touchtunes com>]

ZHOU DX wrote:

> Hi there,
>
> Just a question about gtk_input_add(). I know that we
> can use gtk_input_add() to monitor a socket in the gtk
> main loop, and get notified if something happens to
> it.  
>
> I am just wondering if there is any similar way to
> check if a gthread is finished in the gtk event loop.
> (Say I have four gthreads doing some time consuming
> work. After all of them finish, I need display
> something on the main window.) 
>
> Any idea? Thanks.

You could dedicate a thread to that.

i.e. (please dont expect precice code or argument order... this is
obviously off the top of my head):

GList *dead_threads = NULL;
GMutex *killer = g_mutex_new();
GCond   *kill_cond = g_condition_new();
/*
...
*/

g_thread_create( ... );

/*
...
*/
(in a child thread)
g_mutex_lock(killer);
dead_threads = g_list_append(dead_threads, g_strdup("database_thread"));
g_condition_signal(... kill_condition ...);
g_mutex_unlocl(killer);
exit(0);
/*
...
*/
(in the "controller" thread)
g_mutex_lock(killer);
g_cond_wait( ... killer... kill_condition...);
g_mutex_unlock(killer);

list = g_list_first(dead_threads);
while (list && list->data) {
   /* */
   g_print("*** reaping thread %s ***\n", list->data);

   g_thread_join(/* use somthing associated with string list->data */); 

   list = list->next;
}
/* free list ofcourse */


This is one of I'm sure many ways of writing "event based" code
for thread exits. (probably you can even catch the thread's exit status
with g_thread_join).


Regards,
                                                       -Tristan

--
"Life would be so much easier if we could just look at the source code."
        -- Francios Baumier