newsAdvanced Gtk+ Sequencer - News: Revising AgsThread and AgsMainLoop

 
 
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It was never so easy ... posted by jkraehemann, Wed 16 May 2018 09:57:42 PM UTC - 0 replies
AgsSoundContainer and AgsSoundResource interfaces posted by jkraehemann, Mon 07 May 2018 03:48:09 PM UTC - 0 replies
Refactored key c source files posted by jkraehemann, Thu 19 Apr 2018 06:49:50 PM UTC - 0 replies
Extended semantics and some removals posted by jkraehemann, Sun 08 Apr 2018 05:10:13 PM UTC - 0 replies

Revising AgsThread and AgsMainLoop

Item posted by Joël Krähemann <jkraehemann> on Wed 17 Aug 2016 05:59:48 PM UTC.

I just have added some prototypes to have grained control over program flow. Since GMainContext might have undetermined amount of time wasting on poll(). Advanced Gtk+ Sequencer suffers throughput problems.

Audio output gets delayed and distorted because of that. The way to try to solve it is by suspend AgsGuiThread. AgsGuiThread does something like following and polls in place:

main_context = g_main_context_default();

...

g_main_context_push_thread_default(main_context);

Now, following functions and signals has been added:

  • ags_main_loop_interrupt()
  • ags_main_loop_monitor()
  • ags_thread_interrupted()

AgsThread::suspend and AgsThread::resume exists for quite a long time but have been forgotten. They get improved, yet. Thus AGS_THREAD_INTERRUPTED and AGS_THREAD_MONITORING sync flags has been introduced. In order to get most out of nanosleep() ags_main_loop_monitor() might alter time_spent. After callbacked by ags_thread_interrupted() from ags_thread_resume().

So this is what basically happens within AgsGuiThread.

/* avoid exceeding time_cycle */
ags_thread_run();

/* soundcard has to start new playback */
ags_main_loop_interrupt();
ags_thread_suspend();

/* AgsGuiThread gets notified about next tic and is allowed to recover as */
/* AGS_THREAD_RECOVER_INTERRUPTED. If AGS_THREAD_RESUME_INTERRUPTED is set */
/* thread resumes just at the next cycle. */
ags_thread_resume();
ags_thread_interrupted();

cheers,
Joël

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