Re: Threads and waits

[Tristan Van Berkom <tvb gnome org>]

Fernando Apesteguía wrote:
> Hi,
>
> I have an app. that runs two threads, the main one and other thread that
> collects information from files. I launch the thread by calling
> pthread_create and here comes my first question
>
> ¿Should I use g_thread_create instead? Now I have no problems with these
> pthreads and I can perform mutual exclusion with gdk_threads_enter() and
> gdk_threads_leave() so I'm not sure about change the kind of thread.
>
> Under some conditions I would like the collector thread to make a pause. I
> don't know how to do it with POSIX functions. I've seen Glib's API
> documentation and I'm not sure how could I make this. ¿Should I use a Gcond?
> As I can see in documentation, g_thread_yield is not recommended to be used.

Yes, use a GCond.

g_thread is implemented as pthreads on linux... so as far as that
goes; you're safe for now.

I strongly recommend that you call only g_thread_* functions and not
pthread:
    - This is what makes is portable after all
    - gdk_threads_init() *must* be called for threads to work properly,
      I believe gdk_threads_enter/leave is just a no-op otherwise.
    - Mixing two api's to achieve the same goal is hazerdous; who ever
      said that GDK garauntees to always use pthread on linux ???

Cheers,
                      -Tristan