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333f998123
When the emulation is paused and the ALSA backend is used, make the audio thread wait on a condition variable instead of busy-waiting. This commit fixes bug #7729 Since the ALSA API is not thread-safe, calls to snd_pcm_drop() and snd_pcm_prepare() in AlsaSound::Clear() are protected by the same mutex as the condition variable in AlsaSound::SoundLoop() to make sure that we do not call these functions while a call to snd_pcm_writei() is ongoing.
57 lines
962 B
C++
57 lines
962 B
C++
// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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#include <atomic>
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#include <condition_variable>
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#include <mutex>
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#include <thread>
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#if defined(HAVE_ALSA) && HAVE_ALSA
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#include <alsa/asoundlib.h>
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#endif
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#include "AudioCommon/SoundStream.h"
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#include "Common/CommonTypes.h"
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class AlsaSound final : public SoundStream
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{
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#if defined(HAVE_ALSA) && HAVE_ALSA
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public:
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AlsaSound();
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virtual ~AlsaSound();
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bool Start() override;
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void SoundLoop() override;
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void Stop() override;
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void Update() override;
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void Clear(bool) override;
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static bool isValid()
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{
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return true;
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}
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private:
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enum class ALSAThreadStatus
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{
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RUNNING,
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STOPPING,
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STOPPED,
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};
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bool AlsaInit();
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void AlsaShutdown();
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u8 *mix_buffer;
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std::thread thread;
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std::atomic<ALSAThreadStatus> m_thread_status;
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std::condition_variable cv;
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std::mutex cv_m;
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snd_pcm_t *handle;
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int frames_to_deliver;
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#endif
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};
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