Re: Threads

[Olexiy Avramchenko <olexiy irtech cn ua>]

Russell Shaw wrote:

>> ok. I also have a function that is called from a normal gtk callback, as
>> well as other threads. This function calls gtk things, so it has
>> gtk_threads_enter()/gtk_threads_leave() in it.
>
You should not call gdk_threads_enter in almost all callbacks. There're 
few situations
(timeouts, for example), when callback runs outside the global lock and 
you have to
protect your code.

>> When the function is called from the normal gtk callback, it gets 
>> blocked
>> on gtk_threads_enter(). Why? I have disabled all other threads.
>
That's what 'fast' pthread mutexes do. If the 'fast' mutex is locked 
you'll get blocked
on it on second lock even from the lock-owner thread. GDK -> Glib's 
mutex -> pthread
(LinuxThreads) mutex == 'fast' default mutex.

> I fixed it by doing: gdk_threads_leave() -> function() -> 
> gdk_threads_enter()
> from within the gtk thread.

Yes, it's normal practice if you turned to call protected code.

    Olexiy