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pulseaudio: Some fixes that seem to avoid an assertion in libpulse.

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- Make sure the hotplug thread has hit its main loop before letting
  DetectDevices continue.
- Don't unref the context subscription operation until it completes
  (or we are shutting down).

I'm not sure which change fixed the problem, but at least one of them
appears to have done so.

Reference Issue #7971.
This commit is contained in:
Ryan C. Gordon 2023-07-12 23:29:39 -04:00
parent 776a5e0d25
commit b9d16dac4e
No known key found for this signature in database
GPG key ID: FA148B892AB48044
1 changed files with 19 additions and 2 deletions
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21
src/audio/pulseaudio/SDL_pulseaudio.c
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@ -855,16 +855,29 @@ static void HotplugCallback(pa_context *c, pa_subscription_event_type_t t, uint3
/* this runs as a thread while the Pulse target is initialized to catch hotplug events. */ /* this runs as a thread while the Pulse target is initialized to catch hotplug events. */
static int SDLCALL HotplugThread(void *data) static int SDLCALL HotplugThread(void *data)
{ {
pa_operation *op;
SDL_SetThreadPriority(SDL_THREAD_PRIORITY_LOW); SDL_SetThreadPriority(SDL_THREAD_PRIORITY_LOW);
PULSEAUDIO_pa_threaded_mainloop_lock(pulseaudio_threaded_mainloop); PULSEAUDIO_pa_threaded_mainloop_lock(pulseaudio_threaded_mainloop);
PULSEAUDIO_pa_context_set_subscribe_callback(pulseaudio_context, HotplugCallback, NULL); PULSEAUDIO_pa_context_set_subscribe_callback(pulseaudio_context, HotplugCallback, NULL);
/* don't WaitForPulseOperation on the subscription; when it's done we'll be able to get hotplug events, but waiting doesn't changing anything. */ /* don't WaitForPulseOperation on the subscription; when it's done we'll be able to get hotplug events, but waiting doesn't changing anything. */
PULSEAUDIO_pa_operation_unref(PULSEAUDIO_pa_context_subscribe(pulseaudio_context, PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SOURCE, NULL, NULL)); op = PULSEAUDIO_pa_context_subscribe(pulseaudio_context, PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SOURCE, NULL, NULL);
SDL_SemPost(data);
while (SDL_AtomicGet(&pulseaudio_hotplug_thread_active)) { while (SDL_AtomicGet(&pulseaudio_hotplug_thread_active)) {
PULSEAUDIO_pa_threaded_mainloop_wait(pulseaudio_threaded_mainloop); PULSEAUDIO_pa_threaded_mainloop_wait(pulseaudio_threaded_mainloop);
if (op && PULSEAUDIO_pa_operation_get_state(op) != PA_OPERATION_RUNNING) {
PULSEAUDIO_pa_operation_unref(op);
op = NULL;
}
} }
if (op) {
PULSEAUDIO_pa_operation_unref(op);
}
PULSEAUDIO_pa_context_set_subscribe_callback(pulseaudio_context, NULL, NULL); PULSEAUDIO_pa_context_set_subscribe_callback(pulseaudio_context, NULL, NULL);
PULSEAUDIO_pa_threaded_mainloop_unlock(pulseaudio_threaded_mainloop); PULSEAUDIO_pa_threaded_mainloop_unlock(pulseaudio_threaded_mainloop);
return 0; return 0;
@ -872,6 +885,8 @@ static int SDLCALL HotplugThread(void *data)
static void PULSEAUDIO_DetectDevices() static void PULSEAUDIO_DetectDevices()
{ {
SDL_sem *ready_sem = SDL_CreateSemaphore(0);
PULSEAUDIO_pa_threaded_mainloop_lock(pulseaudio_threaded_mainloop); PULSEAUDIO_pa_threaded_mainloop_lock(pulseaudio_threaded_mainloop);
WaitForPulseOperation(PULSEAUDIO_pa_context_get_server_info(pulseaudio_context, ServerInfoCallback, NULL)); WaitForPulseOperation(PULSEAUDIO_pa_context_get_server_info(pulseaudio_context, ServerInfoCallback, NULL));
WaitForPulseOperation(PULSEAUDIO_pa_context_get_sink_info_list(pulseaudio_context, SinkInfoCallback, (void *)((intptr_t)SDL_TRUE))); WaitForPulseOperation(PULSEAUDIO_pa_context_get_sink_info_list(pulseaudio_context, SinkInfoCallback, (void *)((intptr_t)SDL_TRUE)));
@ -880,7 +895,9 @@ static void PULSEAUDIO_DetectDevices()
/* ok, we have a sane list, let's set up hotplug notifications now... */ /* ok, we have a sane list, let's set up hotplug notifications now... */
SDL_AtomicSet(&pulseaudio_hotplug_thread_active, 1); SDL_AtomicSet(&pulseaudio_hotplug_thread_active, 1);
pulseaudio_hotplug_thread = SDL_CreateThreadInternal(HotplugThread, "PulseHotplug", 256 * 1024, NULL); /* !!! FIXME: this can probably survive in significantly less stack space. */ pulseaudio_hotplug_thread = SDL_CreateThreadInternal(HotplugThread, "PulseHotplug", 256 * 1024, ready_sem); /* !!! FIXME: this can probably survive in significantly less stack space. */
SDL_SemWait(ready_sem);
SDL_DestroySemaphore(ready_sem);
} }
static int PULSEAUDIO_GetDefaultAudioInfo(char **name, SDL_AudioSpec *spec, int iscapture) static int PULSEAUDIO_GetDefaultAudioInfo(char **name, SDL_AudioSpec *spec, int iscapture)