Cleanup the Windows thread stuff to work like the other platforms. Not quite perfect yet.

Core/Core.cpp

@@ -189,10 +189,7 @@ void UpdateRunLoop() {
 		return;
 	}
 	NativeUpdate();
-
-	if (GetUIState() != UISTATE_EXIT) {
-		NativeRender(graphicsContext);
-	}
+	NativeRender(graphicsContext);
 }
 
 void KeepScreenAwake() {
@@ -268,6 +265,7 @@ reswitch:
 		if (GetUIState() != UISTATE_INGAME) {
 			CoreStateProcessed();
 			if (GetUIState() == UISTATE_EXIT) {
+				UpdateRunLoop();
 				return;
 			}
 			Core_RunLoop(ctx);

SDL/SDLMain.cpp

@@ -641,13 +641,13 @@ int main(int argc, char *argv[]) {
 		useEmuThread = false;
 	}
 
+	SDL_SetWindowTitle(window, (app_name_nice + " " + PPSSPP_GIT_VERSION).c_str());
+
 	// Since we render from the main thread, there's nothing done here, but we call it to avoid confusion.
 	if (!graphicsContext->InitFromRenderThread(&error_message)) {
 		printf("Init from thread error: '%s'\n", error_message.c_str());
 	}
 
-	SDL_SetWindowTitle(window, (app_name_nice + " " + PPSSPP_GIT_VERSION).c_str());
-
 #ifdef MOBILE_DEVICE
 	SDL_ShowCursor(SDL_DISABLE);
 #endif

Windows/EmuThread.cpp

@@ -24,102 +24,94 @@
 #include "Core/Config.h"
 #include "thread/threadutil.h"
 
-static std::mutex emuThreadLock;
+enum class EmuThreadState {
+	DISABLED,
+	START_REQUESTED,
+	RUNNING,
+	QUIT_REQUESTED,
+	STOPPED,
+};
+
 static std::thread emuThread;
-static std::atomic<int> emuThreadState;
+static std::atomic<int> emuThreadState((int)EmuThreadState::DISABLED);
 
-static std::mutex renderThreadLock;
-static std::thread renderThread;
-static std::atomic<int> renderThreadReady;
-
-static bool useRenderThread;
-static bool renderThreadFailed;
-static bool renderThreadSucceeded;
+static std::thread mainThread;
+static bool useEmuThread;
 static std::string g_error_message;
+static bool g_inLoop;
 
 extern std::vector<std::wstring> GetWideCmdLine();
 
 class GraphicsContext;
-
 static GraphicsContext *g_graphicsContext;
 
-enum EmuThreadStatus : int {
-	THREAD_NONE = 0,
-	THREAD_INIT,
-	THREAD_CORE_LOOP,
-	THREAD_SHUTDOWN,
-	THREAD_END,
-};
+void EmuThreadFunc(GraphicsContext *graphicsContext);
+void MainThreadFunc();
 
-void EmuThreadFunc();
-void RenderThreadFunc();
-
-// On most other platforms, we let the main thread become the render thread and
+// On most other platforms, we let the "main" thread become the render thread and
 // start a separate emu thread from that, if needed. Should probably switch to that
 // to make it the same on all platforms.
-void EmuThread_Start(bool separateRenderThread) {
-	std::lock_guard<std::mutex> guard(emuThreadLock);
-	emuThread = std::thread(&EmuThreadFunc);
-	useRenderThread = separateRenderThread;
-	if (useRenderThread) {
-		renderThread = std::thread(&RenderThreadFunc);
-	}
+void MainThread_Start(bool separateEmuThread) {
+	useEmuThread = separateEmuThread;
+	mainThread = std::thread(&MainThreadFunc);
 }
 
-void EmuThread_Stop() {
+void MainThread_Stop() {
 	// Already stopped?
-	{
-		std::lock_guard<std::mutex> guard(emuThreadLock);
-		if (emuThreadState == THREAD_END)
-			return;
-	}
-
 	UpdateUIState(UISTATE_EXIT);
-	Core_Stop();
-	Core_WaitInactive(800);
-	emuThread.join();
-	if (useRenderThread) {
-		renderThread.join();
-	}
-
-	PostMessage(MainWindow::GetHWND(), MainWindow::WM_USER_UPDATE_UI, 0, 0);
+	mainThread.join();
 }
 
-bool EmuThread_Ready() {
-	return emuThreadState == THREAD_CORE_LOOP;
+bool MainThread_Ready() {
+	return g_inLoop;
 }
 
-void RenderThreadFunc() {
-	setCurrentThreadName("Render");
-	renderThreadFailed = false;
-	renderThreadSucceeded = false;
-	while (!g_graphicsContext) {
-		sleep_ms(10);
-		continue;
-	}
-
-	std::string error_message;
-	if (!g_graphicsContext->InitFromRenderThread(&error_message)) {
-		g_error_message = error_message;
-		renderThreadFailed = true;
-		return;
-	} else {
-		renderThreadSucceeded = true;
-	}
-
-	g_graphicsContext->ThreadStart();
-	while (g_graphicsContext->ThreadFrame()) {
-		continue;
-	}
-	g_graphicsContext->ThreadEnd();
-	g_graphicsContext->ShutdownFromRenderThread();
-}
-
-void EmuThreadFunc() {
-	emuThreadState = THREAD_INIT;
-
+static void EmuThreadFunc(GraphicsContext *graphicsContext) {
 	setCurrentThreadName("Emu");
 
+	// There's no real requirement that NativeInit happen on this thread.
+	// We just call the update/render loop here.
+	emuThreadState = (int)EmuThreadState::RUNNING;
+
+	NativeInitGraphics(graphicsContext);
+
+	while (emuThreadState != (int)EmuThreadState::QUIT_REQUESTED) {
+		// We're here again, so the game quit.  Restart Core_Run() which controls the UI.
+		// This way they can load a new game.
+		if (!Core_IsActive())
+			UpdateUIState(UISTATE_MENU);
+		Core_Run(g_graphicsContext);
+	}
+
+	emuThreadState = (int)EmuThreadState::STOPPED;
+
+	NativeShutdownGraphics();
+}
+
+static void EmuThreadStart(GraphicsContext *graphicsContext) {
+	emuThreadState = (int)EmuThreadState::START_REQUESTED;
+	emuThread = std::thread(&EmuThreadFunc, graphicsContext);
+}
+
+static void EmuThreadStop() {
+	emuThreadState = (int)EmuThreadState::QUIT_REQUESTED;
+}
+
+static void EmuThreadJoin() {
+	emuThread.join();
+	emuThread = std::thread();
+	ILOG("EmuThreadJoin - joined");
+}
+
+void MainThreadFunc() {
+	if (useEmuThread) {
+		// We'll start up a separate thread we'll call Emu
+		setCurrentThreadName("Render");
+	} else {
+		// This is both Emu and Render.
+		setCurrentThreadName("Emu");
+	}
+
 	host = new WindowsHost(MainWindow::GetHInstance(), MainWindow::GetHWND(), MainWindow::GetDisplayHWND());
 	host->SetWindowTitle(nullptr);
 
@@ -142,18 +134,8 @@ void EmuThreadFunc() {
 	bool success = host->InitGraphics(&error_string, &g_graphicsContext);
 
 	if (success) {
-		if (!useRenderThread) {
-			// This is also the render thread.
-			success = g_graphicsContext->InitFromRenderThread(&error_string);
-		} else {
-			while (!renderThreadFailed && !renderThreadSucceeded) {
-				sleep_ms(10);
-			}
-			success = renderThreadSucceeded;
-			if (!success) {
-				error_string = g_error_message;
-			}
-		}
+		// Main thread is the render thread.
+		success = g_graphicsContext->InitFromRenderThread(&error_string);
 	}
 
 	if (!success) {
@@ -205,8 +187,12 @@ void EmuThreadFunc() {
 		exit(1);
 	}
 
-	NativeInitGraphics(g_graphicsContext);
-	NativeResized();
+	GraphicsContext *graphicsContext = g_graphicsContext;
+
+	if (!useEmuThread) {
+		NativeInitGraphics(graphicsContext);
+		NativeResized();
+	}
 
 	INFO_LOG(BOOT, "Done.");
 	_dbg_update_();
@@ -216,30 +202,59 @@ void EmuThreadFunc() {
 		goto shutdown;
 	}
 
-	emuThreadState = THREAD_CORE_LOOP;
+	g_inLoop = true;
+
+	if (useEmuThread) {
+		EmuThreadStart(graphicsContext);
+	}
+	graphicsContext->ThreadStart();
 
 	if (g_Config.bBrowse)
 		PostMessage(MainWindow::GetHWND(), WM_COMMAND, ID_FILE_LOAD, 0);
 
 	Core_EnableStepping(false);
 
-	while (GetUIState() != UISTATE_EXIT) {
-		// We're here again, so the game quit.  Restart Core_Run() which controls the UI.
-		// This way they can load a new game.
-		if (!Core_IsActive())
-			UpdateUIState(UISTATE_MENU);
-		Core_Run(g_graphicsContext);
+	if (useEmuThread) {
+		while (emuThreadState != (int)EmuThreadState::DISABLED) {
+			graphicsContext->ThreadFrame();
+			if (GetUIState() == UISTATE_EXIT) {
+				break;
+			}
+		}
+	} else {
+		while (GetUIState() != UISTATE_EXIT) {
+			// We're here again, so the game quit.  Restart Core_Run() which controls the UI.
+			// This way they can load a new game.
+			if (!Core_IsActive())
+				UpdateUIState(UISTATE_MENU);
+			Core_Run(g_graphicsContext);
+		}
+	}
+	Core_Stop();
+	Core_WaitInactive(800);
+
+	g_inLoop = false;
+
+	if (useEmuThread) {
+		EmuThreadStop();
+		while (emuThreadState != (int)EmuThreadState::STOPPED) {
+			// Need to keep eating frames to allow the EmuThread to exit correctly.
+			graphicsContext->ThreadFrame();
+		}
+		EmuThreadJoin();
 	}
 
 shutdown:
-	emuThreadState = THREAD_SHUTDOWN;
 
-	NativeShutdownGraphics();
-	if (!useRenderThread)
-		g_graphicsContext->ShutdownFromRenderThread();
+	if (!useEmuThread) {
+		NativeShutdownGraphics();
+	}
+
+	g_graphicsContext->ThreadEnd();
+	g_graphicsContext->ShutdownFromRenderThread();
 
 	// NativeShutdown deletes the graphics context through host->ShutdownGraphics().
 	NativeShutdown();
-	emuThreadState = THREAD_END;
-}
 
+	PostMessage(MainWindow::GetHWND(), MainWindow::WM_USER_UPDATE_UI, 0, 0);
+}

Windows/EmuThread.h

@@ -17,6 +17,6 @@
 
 #pragma once
 
-void EmuThread_Start(bool separateRenderThread);
-void EmuThread_Stop();
-bool EmuThread_Ready();
+void MainThread_Start(bool separateRenderThread);
+void MainThread_Stop();
+bool MainThread_Ready();

Windows/GPU/WindowsGLContext.cpp

@@ -386,8 +386,6 @@ void WindowsGLContext::SwapInterval(int interval) {
 }
 
 void WindowsGLContext::Shutdown() {
-	if (renderManager_)
-		renderManager_->StopThread();
 	glslang::FinalizeProcess();
 }
 

Windows/MainWindow.cpp

@@ -795,7 +795,7 @@ namespace MainWindow
 
 		case WM_COMMAND:
 			{
-				if (!EmuThread_Ready())
+				if (!MainThread_Ready())
 					return DefWindowProc(hWnd, message, wParam, lParam);
 
 				MainWindowMenu_Process(hWnd, wParam);
@@ -844,7 +844,7 @@ namespace MainWindow
 
 		case WM_DROPFILES:
 			{
-				if (!EmuThread_Ready())
+				if (!MainThread_Ready())
 					return DefWindowProc(hWnd, message, wParam, lParam);
 
 				HDROP hdrop = (HDROP)wParam;
@@ -866,9 +866,8 @@ namespace MainWindow
 
 		case WM_CLOSE:
 			InputDevice::StopPolling();
-			EmuThread_Stop();
+			MainThread_Stop();
 			WindowsRawInput::Shutdown();
-
 			return DefWindowProc(hWnd,message,wParam,lParam);
 
 		case WM_DESTROY:
@@ -914,10 +913,10 @@ namespace MainWindow
 		case WM_USER_RESTART_EMUTHREAD:
 			NativeSetRestarting();
 			InputDevice::StopPolling();
-			EmuThread_Stop();
+			MainThread_Stop();
 			coreState = CORE_POWERUP;
 			ResetUIState();
-			EmuThread_Start(false);
+			MainThread_Start(false);
 			InputDevice::BeginPolling();
 			break;
 

Windows/main.cpp

@@ -532,7 +532,7 @@ int WINAPI WinMain(HINSTANCE _hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLin
 	// Emu thread (and render thread, if any) is always running!
 	// Only OpenGL uses an externally managed render thread (due to GL's single-threaded context design). Vulkan
 	// manages its own render thread.
-	EmuThread_Start(g_Config.iGPUBackend == (int)GPUBackend::OPENGL);
+	MainThread_Start(g_Config.iGPUBackend == (int)GPUBackend::OPENGL);
 	InputDevice::BeginPolling();
 
 	HACCEL hAccelTable = LoadAccelerators(_hInstance, (LPCTSTR)IDR_ACCELS);
@@ -586,9 +586,6 @@ int WINAPI WinMain(HINSTANCE _hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLin
 
 	InputDevice::StopPolling();
 
-	// The emuthread calls NativeShutdown when shutting down.
-	EmuThread_Stop();
-
 	MainWindow::DestroyDebugWindows();
 	DialogManager::DestroyAll();
 	timeEndPeriod(1);

android/jni/app-android.cpp

@@ -217,7 +217,7 @@ static void EmuThreadStop() {
 static void EmuThreadJoin() {
 	emuThread.join();
 	emuThread = std::thread();
-	ILOG("EmuThreadStop - joined.");
+	ILOG("EmuThreadJoin - joined");
 }
 
 static void ProcessFrameCommands(JNIEnv *env);