[gst-devel] running g_main_loop_run in separate thread question.

[Edward Hervey]

On Wed, 2010-03-24 at 14:59 +0000, Nicholas Panayis wrote:
> Hi,
> 
> Why not use:
>   gst_bus_enable_sync_message_emission(bus);
>   gst_bus_set_sync_handler(bus, (GstBusSyncHandler) my_sync_handler, 
> &my_var);
>   gst_object_unref(bus);

  It's a valid alternative... but in that case your won't be guaranteed
your sync handler will be called from the main thread.

   Edward

> 
> ?
> 
> Dime
> 
> 
> Edward Hervey wrote:
> > On Wed, 2010-03-24 at 06:29 -0800, wanting2learn wrote:
> >   
> >> I have the following code:
> >>     
> > [...]
> >   
> >> int main()
> >> {
> >>
> >>      start_pipeline();
> >>
> >>      while(1)
> >>      {
> >>         //do stuff here
> >>      }
> >>
> >>      //blah blah
> >> }
> >>
> >> Now my pipeline runs fine but I have kicked off a new thread to handle the
> >> bus messages:
> >> boost::thread thread_gstreamer2(task_gstreamer);
> >>
> >> void task_gstreamer()
> >> {
> >>    g_main_loop_run (g_Loop); 
> >> }
> >>
> >>
> >> The reason I have added this in a new thread is because of the while(1) loop
> >> in my main() function.  If I put the g_main_loop_run in my main() before my
> >> while(1) loop then it would block.
> >> But the problem is that I do not receive any bus messages at all when I
> >> implement it like this.  
> >> Can I do it this way?? 
> >>
> >>
> >>     
> >
> >  I don't get it... why are you asking again and again about the same
> > question ? Tim replied to you a week ago how to handle bus messages when
> > you already have a main loop yet your persist in wanting to add a
> > GMainLoop.
> >
> >   So, to summarize:
> >   1) DO NOT USE GMAINLOOP IF YOU ALREADY HAVE A MAIN LOOP
> >   2) Read 1) again at least 50 times times
> >   3) Do as follow in your main()
> >
> > int main()
> > {
> >
> >      start_pipeline();
> >
> >      while(1)
> >      {
> >         // Do stuff here
> >         // See if we have pending messages on the bus and handle them
> >         while ((msg = gst_bus_pop (g_bus))) {
> >           // Call your bus message handler
> >           bus_call (g_bus, msg, nada);
> >           gst_message_unref (msg);
> >         } 
> >      }
> >
> >      // Stuff before we exit the application
> > }
> >
> >   4) DO NOT USE GMAINLOOP IF YOU ALREADY HAVE A MAIN LOOP
> >
> > Also : http://en.wikipedia.org/wiki/Event_loop will be an interesting
> > read if you still see a difference between GMainLoop and "Main Loop"
> >
> >    Now, start2digest
> >
> >     Edward
> >
> >
> > ------------------------------------------------------------------------------
> > Download Intel® Parallel Studio Eval
> > Try the new software tools for yourself. Speed compiling, find bugs
> > proactively, and fine-tune applications for parallel performance.
> > See why Intel Parallel Studio got high marks during beta.
> > http://p.sf.net/sfu/intel-sw-dev
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
> >
> >   
> 
> 
> ------------------------------------------------------------------------------
> Download Intel® Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel