From 9da57e7458ed2e539ba1693ca748c0e5c7969585 Mon Sep 17 00:00:00 2001 From: Pete Beardmore Date: Wed, 5 Mar 2014 08:08:12 +0000 Subject: PulseOutputPlugin: avoid locking mainloop object from within mainloop thread -fixes regression introduced by: '8d6fedf8177d0d2ced81e6d93d35c368b2ac69db [PATCH] Mixer: add class MixerListener' -listener.OnMixerVolumeChanged() called GetVolume() which attempted to acquire the lock but as per 'pa_threaded_mainloop_lock()' documentation: This function may not be called inside the event loop thread. Events that are dispatched from the event loop thread are executed with this lock held -this patch seperates the underlying action of GetVolume() into a new GetVolumeInternal() function, to be called only when the lock is already held, as is the case for the listener.OnMixerVolumeChanged() call --- src/mixer/plugins/PulseMixerPlugin.cxx | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'src/mixer/plugins') diff --git a/src/mixer/plugins/PulseMixerPlugin.cxx b/src/mixer/plugins/PulseMixerPlugin.cxx index 0a765bf68..c5f20723b 100644 --- a/src/mixer/plugins/PulseMixerPlugin.cxx +++ b/src/mixer/plugins/PulseMixerPlugin.cxx @@ -52,6 +52,7 @@ public: void Offline(); void VolumeCallback(const pa_sink_input_info *i, int eol); void Update(pa_context *context, pa_stream *stream); + int GetVolumeInternal(Error &error); /* virtual methods from class Mixer */ virtual bool Open(gcc_unused Error &error) override { @@ -92,7 +93,7 @@ PulseMixer::VolumeCallback(const pa_sink_input_info *i, int eol) online = true; volume = i->volume; - listener.OnMixerVolumeChanged(*this, GetVolume(IgnoreError())); + listener.OnMixerVolumeChanged(*this, GetVolumeInternal(IgnoreError())); } /** @@ -187,15 +188,23 @@ PulseMixer::GetVolume(gcc_unused Error &error) { pulse_output_lock(output); - int result = online - ? (int)((100 * (pa_cvolume_avg(&volume) + 1)) / PA_VOLUME_NORM) - : -1; - + int result = GetVolumeInternal(error); pulse_output_unlock(output); return result; } +/** + * Pulse mainloop lock must be held by caller + */ +int +PulseMixer::GetVolumeInternal(gcc_unused Error &error) +{ + return online ? + (int)((100 * (pa_cvolume_avg(&volume) + 1)) / PA_VOLUME_NORM) + : -1; +} + bool PulseMixer::SetVolume(unsigned new_volume, Error &error) { -- cgit v1.2.3