[LAD] alsa sequencer and sysex editing

[rdxesy at yahoo.de]

On Mon, Jun 02, 2008 at 21:55:30 +0200
Fons Adriaensen <fons at kokkinizita.net> wrote:
> On Mon, Jun 02, 2008 at 07:32:16PM +0200, rdxesy at yahoo.de wrote:
> Other solutions are:
> 
> - Use a separate thread to read the midi data, then send
> it as an X event (you can make 'user' event types) to your
> main window. Doing this will trigger the GTK loop.
> 
> - Use a separate thread, and a mutex used by this thread
> and the GTK loop to avoid concurrent access to data and
> mixed-up X-calls.
> 
> 

Ciao,
i use the mutex solution since tha fits well into the 
existing code "). So, I have a thread that polls the 
incoming queue in an endless loop:

while(1)
...
midi_callback()
}

and this function:
midi_callback(void)
{ ...
gdk_threads_enter ();
/* do the slider dance */
gdk_threads_leave ();
...
}

works and i am happy as the gui feedback is almost instant 
now. ")

Cheers,
Jan