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replace sink/source SET_STATE handlers with callbacks

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There are no behaviour changes, the code from almost all the SET_STATE
handlers is moved with minimal changes to the newly introduced
set_state_in_io_thread() callback. The only exception is module-tunnel,
which has to call pa_sink_render() after pa_sink.thread_info.state has
been updated. The set_state_in_io_thread() callback is called before
updating that variable, so moving the SET_STATE handler code to the
callback isn't possible.

The purpose of this change is to make it easier to get state change
handling right in modules. Hooking to the SET_STATE messages in modules
required care in calling pa_sink/source_process_msg() at the right time
(or not calling it at all, as was the case on resume failures), and
there were a few bugs (fixed before this patch). Now the core takes care
of ordering things correctly.

Another motivation for this change is that there was some talk about
adding a suspend_cause variable to pa_sink/source.thread_info. The
variable would be updated in the core SET_STATE handler, but that would
not work with the old design, because in case of resume failures modules
didn't call the core message handler.
This commit is contained in:
Tanu Kaskinen 2018-03-13 19:40:38 +02:00
parent 73b8a57078
commit b2537a8f38
25 changed files with 874 additions and 658 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/pulsecore/source.c
View file

@ -142,6 +142,7 @@ static void reset_callbacks(pa_source *s) {
pa_assert(s);
s->set_state_in_main_thread = NULL;
s->set_state_in_io_thread = NULL;
s->get_volume = NULL;
s->set_volume = NULL;
s->write_volume = NULL;
@ -2224,6 +2225,13 @@ int pa_source_process_msg(pa_msgobject *object, int code, void *userdata, int64_
(s->thread_info.state == PA_SOURCE_SUSPENDED && PA_SOURCE_IS_OPENED(PA_PTR_TO_UINT(userdata))) ||
(PA_SOURCE_IS_OPENED(s->thread_info.state) && PA_PTR_TO_UINT(userdata) == PA_SOURCE_SUSPENDED);
if (s->set_state_in_io_thread) {
int r;
if ((r = s->set_state_in_io_thread(s, PA_PTR_TO_UINT(userdata))) < 0)
return r;
}
s->thread_info.state = PA_PTR_TO_UINT(userdata);
if (suspend_change) {