AlsaSoundStream: Convert volatile variables to atomics

Source/Core/AudioCommon/AlsaSoundStream.cpp

@@ -23,13 +23,13 @@ AlsaSound::~AlsaSound()
 bool AlsaSound::Start()
 {
 	thread = std::thread(&AlsaSound::SoundLoop, this);
-	thread_data = 0;
+	thread_data.store(0);
 	return true;
 }
 
 void AlsaSound::Stop()
 {
-	thread_data = 1;
+	thread_data.store(1);
 	thread.join();
 }
 
@@ -42,11 +42,11 @@ void AlsaSound::Update()
 void AlsaSound::SoundLoop()
 {
 	if (!AlsaInit()) {
-		thread_data = 2;
+		thread_data.store(2);
 		return;
 	}
 	Common::SetCurrentThreadName("Audio thread - alsa");
-	while (!thread_data)
+	while (thread_data.load() == 0)
 	{
 		m_mixer->Mix(reinterpret_cast<short *>(mix_buffer), frames_to_deliver);
 		int rc = m_muted ? 1337 : snd_pcm_writei(handle, mix_buffer, frames_to_deliver);
@@ -61,7 +61,7 @@ void AlsaSound::SoundLoop()
 		}
 	}
 	AlsaShutdown();
-	thread_data = 2;
+	thread_data.store(2);
 }
 
 bool AlsaSound::AlsaInit()

Source/Core/AudioCommon/AlsaSoundStream.h

@@ -4,13 +4,15 @@
 
 #pragma once
 
+#include <atomic>
+#include <thread>
+
 #if defined(HAVE_ALSA) && HAVE_ALSA
 #include <alsa/asoundlib.h>
 #endif
 
 #include "AudioCommon/SoundStream.h"
 #include "Common/CommonTypes.h"
-#include "Common/Thread.h"
 
 class AlsaSound final : public SoundStream
 {
@@ -39,7 +41,7 @@ private:
 	// 0 = continue
 	// 1 = shutdown
 	// 2 = done shutting down.
-	volatile int thread_data;
+	std::atomic<int> thread_data;
 
 	snd_pcm_t *handle;
 	int frames_to_deliver;