AudioCommon: Migrate threadData to OpenALStream and AOSoundStream

This is only ever used in these two sound streams. Seems silly to have it as a class member. Converted it to an atomic as well.

Source/Core/AudioCommon/AOSoundStream.cpp

@@ -32,7 +32,7 @@ void AOSound::SoundLoop()
 
 	buf_size = format.bits/8 * format.channels * format.rate;
 
-	while (!threadData)
+	while (m_run_thread.load())
 	{
 		m_mixer->Mix(realtimeBuffer, numBytesToRender >> 2);
 
@@ -47,6 +47,7 @@ void AOSound::SoundLoop()
 
 bool AOSound::Start()
 {
+	m_run_thread.store(true);
 	memset(realtimeBuffer, 0, sizeof(realtimeBuffer));
 
 	thread = std::thread(&AOSound::SoundLoop, this);
@@ -60,7 +61,7 @@ void AOSound::Update()
 
 void AOSound::Stop()
 {
-	threadData = 1;
+	m_run_thread.store(false);
 	soundSyncEvent.Set();
 
 	{

Source/Core/AudioCommon/AOSoundStream.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <atomic>
 #include <mutex>
 #include <thread>
 
@@ -19,6 +20,7 @@ class AOSound final : public SoundStream
 {
 #if defined(HAVE_AO) && HAVE_AO
 	std::thread thread;
+	std::atomic<bool> m_run_thread;
 	std::mutex soundCriticalSection;
 	Common::Event soundSyncEvent;
 

Source/Core/AudioCommon/OpenALStream.cpp

@@ -23,6 +23,7 @@ static soundtouch::SoundTouch soundTouch;
 //
 bool OpenALStream::Start()
 {
+	m_run_thread.store(true);
 	bool bReturn = false;
 
 	ALDeviceList pDeviceList;
@@ -72,7 +73,7 @@ bool OpenALStream::Start()
 
 void OpenALStream::Stop()
 {
-	threadData = 1;
+	m_run_thread.store(false);
 	// kick the thread if it's waiting
 	soundSyncEvent.Set();
 
@@ -183,7 +184,7 @@ void OpenALStream::SoundLoop()
 	soundTouch.setSetting(SETTING_SEEKWINDOW_MS, 28);
 	soundTouch.setSetting(SETTING_OVERLAP_MS, 12);
 
-	while (!threadData)
+	while (m_run_thread.load())
 	{
 		// num_samples_to_render in this update - depends on SystemTimers::AUDIO_DMA_PERIOD.
 		const u32 stereo_16_bit_size = 4;

Source/Core/AudioCommon/OpenALStream.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <atomic>
 #include <thread>
 
 #include "AudioCommon/SoundStream.h"
@@ -72,6 +73,8 @@ public:
 
 private:
 	std::thread thread;
+	std::atomic<bool> m_run_thread;
+
 	Common::Event soundSyncEvent;
 
 	short realtimeBuffer[OAL_MAX_SAMPLES * STEREO_CHANNELS];

Source/Core/AudioCommon/SoundStream.h

@@ -11,17 +11,13 @@
 class SoundStream
 {
 protected:
-
 	CMixer* m_mixer;
-	// We set this to shut down the sound thread.
-	// 0=keep playing, 1=stop playing NOW.
-	volatile int threadData;
 	bool m_logAudio;
 	WaveFileWriter g_wave_writer;
 	bool m_muted;
 
 public:
-	SoundStream(CMixer* mixer) : m_mixer(mixer), threadData(0), m_logAudio(false), m_muted(false) {}
+	SoundStream(CMixer* mixer) : m_mixer(mixer), m_logAudio(false), m_muted(false) {}
 	virtual ~SoundStream() { delete m_mixer; }
 
 	static  bool isValid() { return false; }