Improve load screen responsiveness

Aerofoil/GpSystemServices_Win32.cpp

@@ -9,6 +9,26 @@
 #undef CreateMutex
 #endif
 
+struct GpSystemServices_Win32_ThreadStartParams
+{
+	GpSystemServices_Win32::ThreadFunc_t m_threadFunc;
+	void *m_threadContext;
+	PortabilityLayer::HostThreadEvent *m_threadStartEvent;
+};
+
+static DWORD WINAPI StaticStartThread(LPVOID lpThreadParameter)
+{
+	const GpSystemServices_Win32_ThreadStartParams *threadParams = static_cast<const GpSystemServices_Win32_ThreadStartParams*>(lpThreadParameter);
+
+	GpSystemServices_Win32::ThreadFunc_t threadFunc = threadParams->m_threadFunc;
+	void *threadContext = threadParams->m_threadContext;
+	PortabilityLayer::HostThreadEvent *threadStartEvent = threadParams->m_threadStartEvent;
+
+	threadStartEvent->Signal();
+
+	return threadFunc(threadContext);
+}
+
 GpSystemServices_Win32::GpSystemServices_Win32()
 	: m_isTouchscreenSimulation(false)
 {
@@ -67,6 +87,30 @@ PortabilityLayer::HostThreadEvent *GpSystemServices_Win32::CreateThreadEvent(boo
 	return GpThreadEvent_Win32::Create(autoReset, startSignaled);
 }
 
+void *GpSystemServices_Win32::CreateThread(ThreadFunc_t threadFunc, void *context)
+{
+	PortabilityLayer::HostThreadEvent *evt = CreateThreadEvent(true, false);
+	if (!evt)
+		return nullptr;
+
+	GpSystemServices_Win32_ThreadStartParams startParams;
+	startParams.m_threadContext = context;
+	startParams.m_threadFunc = threadFunc;
+	startParams.m_threadStartEvent = evt;
+
+	HANDLE threadHdl = ::CreateThread(nullptr, 0, StaticStartThread, &startParams, 0, nullptr);
+	if (threadHdl == nullptr)
+	{
+		evt->Destroy();
+		return nullptr;
+	}
+
+	evt->Wait();
+	evt->Destroy();
+
+	return threadHdl;
+}
+
 uint64_t GpSystemServices_Win32::GetFreeMemoryCosmetic() const
 {
 	MEMORYSTATUSEX memStatus;
@@ -100,6 +144,13 @@ bool GpSystemServices_Win32::IsTextInputObstructive() const
 	return false;
 }
 
+unsigned int GpSystemServices_Win32::GetCPUCount() const
+{
+	SYSTEM_INFO sysInfo;
+	GetSystemInfo(&sysInfo);
+	return sysInfo.dwNumberOfProcessors;
+}
+
 void GpSystemServices_Win32::SetTouchscreenSimulation(bool isTouchscreenSimulation)
 {
 	m_isTouchscreenSimulation = isTouchscreenSimulation;

Aerofoil/GpSystemServices_Win32.h

@@ -9,6 +9,11 @@
 #undef CreateMutex
 #endif
 
+#pragma push_macro("CreateThread")
+#ifdef CreateThread
+#undef CreateThread
+#endif
+
 
 class GpSystemServices_Win32 final : public PortabilityLayer::HostSystemServices
 {
@@ -19,12 +24,14 @@ public:
 	void GetLocalDateTime(unsigned int &year, unsigned int &month, unsigned int &day, unsigned int &hour, unsigned int &minute, unsigned int &second) const override;
 	PortabilityLayer::HostMutex *CreateMutex() override;
 	PortabilityLayer::HostMutex *CreateRecursiveMutex() override;
+	void *CreateThread(ThreadFunc_t threadFunc, void *context) override;
 	PortabilityLayer::HostThreadEvent *CreateThreadEvent(bool autoReset, bool startSignaled) override;
 	uint64_t GetFreeMemoryCosmetic() const override;
 	void Beep() const override;
 	bool IsTouchscreen() const override;
 	bool IsUsingMouseAsTouch() const override;
 	bool IsTextInputObstructive() const override;
+	unsigned int GetCPUCount() const override;
 
 	void SetTouchscreenSimulation(bool isTouchscreenSimulation);
 
@@ -37,3 +44,4 @@ private:
 };
 
 #pragma pop_macro("CreateMutex")
+#pragma pop_macro("CreateThread")

AerofoilAndroid/app/jni/main/GpSystemServices_Android.cpp

@@ -1,10 +1,32 @@
 #include "GpSystemServices_Android.h"
 #include "HostMutex.h"
 #include "HostThreadEvent.h"
+#include "SDL.h"
 
 #include <time.h>
 #include <mutex>
 #include <condition_variable>
+#include <unistd.h>
+
+struct GpSystemServices_Android_ThreadStartParams
+{
+	GpSystemServices_Android::ThreadFunc_t m_threadFunc;
+	void *m_threadContext;
+	PortabilityLayer::HostThreadEvent *m_threadStartEvent;
+};
+
+static int SDLCALL StaticStartThread(void *lpThreadParameter)
+{
+	const GpSystemServices_Android_ThreadStartParams *threadParams = static_cast<const GpSystemServices_Android_ThreadStartParams*>(lpThreadParameter);
+
+	GpSystemServices_Android::ThreadFunc_t threadFunc = threadParams->m_threadFunc;
+	void *threadContext = threadParams->m_threadContext;
+	PortabilityLayer::HostThreadEvent *threadStartEvent = threadParams->m_threadStartEvent;
+
+	threadStartEvent->Signal();
+
+	return threadFunc(threadContext);
+}
 
 template<class TMutex>
 class GpMutex_Cpp11 final : public PortabilityLayer::HostMutex
@@ -173,6 +195,31 @@ PortabilityLayer::HostMutex *GpSystemServices_Android::CreateMutex()
 	return new (mutex) GpMutex_Cpp11_Vanilla();
 }
 
+
+void *GpSystemServices_Android::CreateThread(ThreadFunc_t threadFunc, void *context)
+{
+	PortabilityLayer::HostThreadEvent *evt = CreateThreadEvent(true, false);
+	if (!evt)
+		return nullptr;
+
+	GpSystemServices_Android_ThreadStartParams startParams;
+	startParams.m_threadContext = context;
+	startParams.m_threadFunc = threadFunc;
+	startParams.m_threadStartEvent = evt;
+
+	SDL_Thread *thread = SDL_CreateThread(StaticStartThread, "WorkerThread", &startParams);
+	if (thread == nullptr)
+	{
+		evt->Destroy();
+		return nullptr;
+	}
+
+	evt->Wait();
+	evt->Destroy();
+
+	return thread;
+}
+
 PortabilityLayer::HostMutex *GpSystemServices_Android::CreateRecursiveMutex()
 {
 	GpMutex_Cpp11_Recursive *mutex = static_cast<GpMutex_Cpp11_Recursive*>(malloc(sizeof(GpMutex_Cpp11_Recursive)));
@@ -193,7 +240,9 @@ PortabilityLayer::HostThreadEvent *GpSystemServices_Android::CreateThreadEvent(b
 
 uint64_t GpSystemServices_Android::GetFreeMemoryCosmetic() const
 {
-	return 0;
+	long pages = sysconf(_SC_AVPHYS_PAGES);
+	long pageSize = sysconf(_SC_PAGE_SIZE);
+	return pages * pageSize;
 }
 
 void GpSystemServices_Android::Beep() const
@@ -215,6 +264,11 @@ bool GpSystemServices_Android::IsTextInputObstructive() const
 	return true;
 }
 
+unsigned int GpSystemServices_Android::GetCPUCount() const
+{
+	return SDL_GetCPUCount();
+}
+
 GpSystemServices_Android *GpSystemServices_Android::GetInstance()
 {
 	return &ms_instance;

AerofoilAndroid/app/jni/main/GpSystemServices_Android.h

@@ -12,12 +12,14 @@ public:
 	void GetLocalDateTime(unsigned int &year, unsigned int &month, unsigned int &day, unsigned int &hour, unsigned int &minute, unsigned int &second) const override;
 	PortabilityLayer::HostMutex *CreateMutex() override;
 	PortabilityLayer::HostMutex *CreateRecursiveMutex() override;
+	void *CreateThread(ThreadFunc_t threadFunc, void *context) override;
 	PortabilityLayer::HostThreadEvent *CreateThreadEvent(bool autoReset, bool startSignaled) override;
 	uint64_t GetFreeMemoryCosmetic() const override;
 	void Beep() const override;
 	bool IsTouchscreen() const override;
 	bool IsUsingMouseAsTouch() const override;
 	bool IsTextInputObstructive() const override;
+	unsigned int GetCPUCount() const override;
 
 	static GpSystemServices_Android *GetInstance();
 

ApplicationResourcePatches/manifest.json

@@ -11,6 +11,7 @@
 		"DITL/2006.json" : "ApplicationResourcePatches/DITL/2006.json",
 		"PICT/1300.bmp" : "ApplicationResourcePatches/PICT/1300.bmp",
 		"PICT/1301.bmp" : "ApplicationResourcePatches/PICT/1301.bmp",
+		"PICT/1302.bmp" : "ApplicationResourcePatches/PICT/1302.bmp",
 		"PICT/1971.bmp" : "ApplicationResourcePatches/PICT/1971.bmp",
 		"PICT/1972.bmp" : "ApplicationResourcePatches/PICT/1972.bmp",
 		"PICT/1973.bmp" : "ApplicationResourcePatches/PICT/1973.bmp",

GpApp/Main.cpp

@@ -6,7 +6,8 @@
 //============================================================================
 
 
-#include <WindowDef.h>
+#include "WindowDef.h"
+#include "BitmapImage.h"
 #include "PLApplication.h"
 #include "PLKeyEncoding.h"
 #include "PLStandardColors.h"
@@ -16,19 +17,30 @@
 #include "FontFamily.h"
 #include "GpRenderedFontMetrics.h"
 #include "HostDisplayDriver.h"
+#include "HostSystemServices.h"
+#include "HostThreadEvent.h"
 #include "IGpDisplayDriver.h"
 #include "GpIOStream.h"
 #include "House.h"
 #include "MainMenuUI.h"
+#include "MemoryManager.h"
 #include "MenuManager.h"
+#include "QDPixMap.h"
 #include "RenderedFont.h"
 #include "ResolveCachingColor.h"
+#include "ResourceManager.h"
+#include "Utilities.h"
 #include "WindowManager.h"
+#include "WorkerThread.h"
+
+#include <atomic>
 
 
+int loadScreenRingStep;
 WindowPtr loadScreenWindow;
 Rect loadScreenProgressBarRect;
 int loadScreenProgress;
+DrawSurface *loadScreenRingSurface;
 
 
 #define kPrefsVersion			0x0038
@@ -345,6 +357,23 @@ void WriteOutPrefs (void)
 	UnivSetSoundVolume(wasVolume, thisMac.hasSM3);
 }
 
+void StepLoadScreenRing()
+{
+	if (loadScreenWindow)
+	{
+		const int loadScreenStepGranularity = 2;
+		loadScreenRingStep++;
+		if (loadScreenRingStep == 24 * loadScreenStepGranularity)
+			loadScreenRingStep = 0;
+
+		Rect ringDestRect = Rect::Create(8, 8, 24, 24);
+		Rect ringSrcRect = Rect::Create(0, 0, 16, 16) + Point::Create((loadScreenRingStep / loadScreenStepGranularity) * 16, 0);
+
+		CopyBits(*loadScreenRingSurface->m_port.GetPixMap(), *loadScreenWindow->GetDrawSurface()->m_port.GetPixMap(), &ringSrcRect, &ringDestRect, srcCopy);
+		loadScreenWindow->GetDrawSurface()->m_port.SetDirty(PortabilityLayer::QDPortDirtyFlag_Contents);
+	}
+}
+
 void StepLoadScreen(int steps)
 {
 	if (loadScreenWindow)
@@ -362,9 +391,15 @@ void StepLoadScreen(int steps)
 
 		loadScreenWindow->GetDrawSurface()->FillRect(Rect::Create(loadScreenProgressBarRect.top, loadScreenProgressBarRect.left + prevStep, loadScreenProgressBarRect.bottom, loadScreenProgressBarRect.left + thisStep), blackColor);
 		ForceSyncFrame();
-	}
 
-	SpinCursor(steps);
+		for (int i = 0; i < steps; i++)
+		{
+			StepLoadScreenRing();
+			Delay(1, nullptr);
+		}
+	}
+	else
+		SpinCursor(steps);
 }
 
 void InitLoadingWindow()
@@ -374,19 +409,28 @@ void InitLoadingWindow()
 		return;
 
 	static const int kLoadScreenHeight = 32;
+	static const int kLoadRingResource = 1302;
 
-	int kLoadScreenWidth = 256;
+	int kLoadScreenWidth = 296;
 	PLPasStr loadingText = PSTR("Loading...");
 
 	if (!isPrefsLoaded)
 	{
 		loadingText = PSTR("Performing First-Time Setup...");
-		kLoadScreenWidth = 420;
+		kLoadScreenWidth = 440;
 	}
 
 	ForceSyncFrame();
 	PLSysCalls::Sleep(1);
 
+	THandle<BitmapImage> loadRingImageH = PortabilityLayer::ResourceManager::GetInstance()->GetAppResource('PICT', kLoadRingResource).StaticCast<BitmapImage>();
+	BitmapImage *loadRingImage = *loadRingImageH;
+
+	DrawSurface *loadRingSurface = nullptr;
+	Rect loadRingRect = loadRingImage->GetRect();
+	CreateOffScreenGWorld(&loadRingSurface, &loadRingRect);
+	loadRingSurface->DrawPicture(loadRingImageH, loadRingRect);
+
 	int32_t lsX = (thisMac.fullScreen.Width() - kLoadScreenWidth) / 2;
 	int32_t lsY = (thisMac.fullScreen.Height() - kLoadScreenHeight) / 2;
 
@@ -409,37 +453,101 @@ void InitLoadingWindow()
 
 	PortabilityLayer::RenderedFont *font = GetApplicationFont(18, PortabilityLayer::FontFamilyFlag_None, true);
 	int32_t textY = (kLoadScreenHeight + font->GetMetrics().m_ascent) / 2;
-	surface->DrawString(Point::Create(4+16, textY), loadingText, blackColor, font);
+	surface->DrawString(Point::Create(4+16+8, textY), loadingText, blackColor, font);
 
 	static const int32_t loadBarPadding = 16;
-	int32_t loadBarStartX = static_cast<int32_t>(font->MeasureString(loadingText.UChars(), loadingText.Length())) + 4 + 16 + loadBarPadding;
+	int32_t loadBarStartX = static_cast<int32_t>(font->MeasureString(loadingText.UChars(), loadingText.Length())) + 4 + 16 + 8 + loadBarPadding;
 	int32_t loadBarEndX = loadScreenLocalRect.right - loadBarPadding;
 
 	loadScreenProgressBarRect = Rect::Create((loadScreenLocalRect.Height() - 8) / 2, loadBarStartX, (loadScreenLocalRect.Height() + 8) / 2, loadBarEndX);
 	loadScreenProgress = 0;
 
 	surface->FrameRect(loadScreenProgressBarRect, blackColor);
+
+	Rect ringDestRect = Rect::Create(8, 8, 24, 24);
+	Rect ringSrcRect = Rect::Create(0, 0, 16, 16);
+	CopyBits(*loadRingSurface->m_port.GetPixMap(), *surface->m_port.GetPixMap(), &ringSrcRect, &ringDestRect, srcCopy);
+
+	loadRingImageH.Dispose();
+
+	loadScreenRingSurface = loadRingSurface;
+}
+
+enum PreloadFontCategory
+{
+	FontCategory_System,
+	FontCategory_Application,
+	FontCategory_Handwriting,
+	FontCategory_Monospace,
+};
+
+struct PreloadFontSpec
+{
+	PreloadFontCategory m_category;
+	int m_size;
+	int m_flags;
+	bool m_aa;
+};
+
+struct PreloadFontWorkSlot
+{
+	PortabilityLayer::HostThreadEvent *m_completedEvent;
+	PortabilityLayer::WorkerThread *m_workerThread;
+	std::atomic<int> m_singleJobCompleted;
+	const PreloadFontSpec *m_spec;
+	bool m_queued;
+
+	PreloadFontWorkSlot();
+	~PreloadFontWorkSlot();
+};
+
+PreloadFontWorkSlot::PreloadFontWorkSlot()
+	: m_completedEvent(nullptr)
+	, m_workerThread(nullptr)
+	, m_spec(nullptr)
+	, m_queued(false)
+{
+}
+
+PreloadFontWorkSlot::~PreloadFontWorkSlot()
+{
+	if (m_workerThread)
+		m_workerThread->Destroy();
+}
+
+void PreloadSingleFont (const PreloadFontSpec &spec)
+{
+	switch (spec.m_category)
+	{
+	case FontCategory_Application:
+		GetApplicationFont(spec.m_size, spec.m_flags, spec.m_aa);
+		break;
+	case FontCategory_System:
+		GetSystemFont(spec.m_size, spec.m_flags, spec.m_aa);
+		break;
+	case FontCategory_Handwriting:
+		GetHandwritingFont(spec.m_size, spec.m_flags, spec.m_aa);
+		break;
+	case FontCategory_Monospace:
+		GetMonospaceFont(spec.m_size, spec.m_flags, spec.m_aa);
+		break;
+	default:
+		break;
+	}
+}
+
+void PreloadThreadFunc(void *context)
+{
+	PreloadFontWorkSlot *wSlot = static_cast<PreloadFontWorkSlot*>(context);
+
+	PreloadSingleFont(*wSlot->m_spec);
+	++wSlot->m_singleJobCompleted;
+	wSlot->m_completedEvent->Signal();
 }
 
 void PreloadFonts()
 {
-	enum FontCategory
-	{
-		FontCategory_System,
-		FontCategory_Application,
-		FontCategory_Handwriting,
-		FontCategory_Monospace,
-	};
-
-	struct FontSpec
-	{
-		FontCategory m_category;
-		int m_size;
-		int m_flags;
-		bool m_aa;
-	};
-
-	FontSpec specs[] =
+	static PreloadFontSpec specs[] =
 	{
 		{ FontCategory_System, 9, PortabilityLayer::FontFamilyFlag_Bold, true },
 		{ FontCategory_System, 10, PortabilityLayer::FontFamilyFlag_Bold, true },
@@ -456,32 +564,51 @@ void PreloadFonts()
 		{ FontCategory_Monospace, 10, PortabilityLayer::FontFamilyFlag_None, true },
 	};
 
+	PortabilityLayer::MemoryManager *mm = PortabilityLayer::MemoryManager::GetInstance();
+
+
 	const int numFontSpecs = sizeof(specs) / sizeof(specs[0]);
 
-	for (int i = 0; i < numFontSpecs; i++)
-	{
-		const FontSpec &spec = specs[i];
+	int queuedSpecs = 0;
+	int completedSpecs = 0;
 
-		switch (spec.m_category)
+	// We can't actually slot these because FT isn't thread-safe when accessing the same font,
+	// but we can do this to unclog the render thread.
+	PreloadFontWorkSlot slot;
+	slot.m_workerThread = PortabilityLayer::WorkerThread::Create();
+	slot.m_completedEvent = PortabilityLayer::HostSystemServices::GetInstance()->CreateThreadEvent(true, false);
+
+	while (completedSpecs < numFontSpecs)
+	{
+		if (slot.m_queued)
 		{
-		case FontCategory_Application:
-			GetApplicationFont(spec.m_size, spec.m_flags, spec.m_aa);
-			break;
-		case FontCategory_System:
-			GetSystemFont(spec.m_size, spec.m_flags, spec.m_aa);
-			break;
-		case FontCategory_Handwriting:
-			GetHandwritingFont(spec.m_size, spec.m_flags, spec.m_aa);
-			break;
-		case FontCategory_Monospace:
-			GetMonospaceFont(spec.m_size, spec.m_flags, spec.m_aa);
-			break;
-		default:
-			break;
+			if (slot.m_singleJobCompleted.load(std::memory_order_relaxed) != 0)
+			{
+				slot.m_completedEvent->Wait();
+				slot.m_queued = false;
+				completedSpecs++;
+
+				StepLoadScreen(1);
+			}
 		}
 
-		StepLoadScreen(1);
+		if (!slot.m_queued)
+		{
+			if (queuedSpecs < numFontSpecs)
+			{
+				slot.m_queued = true;
+				slot.m_singleJobCompleted.store(0);
+				slot.m_spec = specs + queuedSpecs;
+				slot.m_workerThread->AsyncExecuteTask(PreloadThreadFunc, &slot);
+
+				queuedSpecs++;
+			}
+		}
+
+		StepLoadScreenRing();
+		Delay(1, nullptr);
 	}
+
 }
 
 void gpAppInit()
@@ -556,6 +683,12 @@ int gpAppMain()
 		PLSysCalls::Sleep(15);
 	}
 
+	if (loadScreenRingSurface)
+	{
+		DisposeGWorld(loadScreenRingSurface);
+		loadScreenRingSurface = nullptr;
+	}
+
 	OpenMainWindow();
 
 	if (isDoColorFade)

PortabilityLayer/Android.mk

@@ -105,6 +105,7 @@ LOCAL_SRC_FILES := \
 	UTF16.cpp	\
 	WindowDef.cpp	\
 	WindowManager.cpp	\
+	WorkerThread.cpp	\
 	XModemCRC.cpp	\
 	ZipFileProxy.cpp
 	

PortabilityLayer/HostSystemServices.h

@@ -6,6 +6,10 @@
 #error "CreateMutex was macrod"
 #endif
 
+#ifdef CreateThread
+#error "CreateThread was macrod"
+#endif
+
 namespace PortabilityLayer
 {
 	class HostMutex;
@@ -14,16 +18,20 @@ namespace PortabilityLayer
 	class HostSystemServices
 	{
 	public:
+		typedef int (*ThreadFunc_t)(void *context);
+
 		virtual int64_t GetTime() const = 0;
 		virtual void GetLocalDateTime(unsigned int &year, unsigned int &month, unsigned int &day, unsigned int &hour, unsigned int &minute, unsigned int &second) const = 0;
 		virtual HostMutex *CreateMutex() = 0;
 		virtual HostMutex *CreateRecursiveMutex() = 0;
+		virtual void *CreateThread(ThreadFunc_t threadFunc, void *context) = 0;
 		virtual HostThreadEvent *CreateThreadEvent(bool autoReset, bool startSignaled) = 0;
 		virtual uint64_t GetFreeMemoryCosmetic() const = 0;	// Returns free memory in bytes, does not have to be accurate
 		virtual void Beep() const = 0;
 		virtual bool IsTouchscreen() const = 0;
 		virtual bool IsUsingMouseAsTouch() const = 0;
 		virtual bool IsTextInputObstructive() const = 0;
+		virtual unsigned int GetCPUCount() const = 0;
 
 		static void SetInstance(HostSystemServices *instance);
 		static HostSystemServices *GetInstance();

PortabilityLayer/PortabilityLayer.vcxproj

@@ -165,6 +165,7 @@
     <ClInclude Include="PLUnalignedPtr.h" />
     <ClInclude Include="PLWidgets.h" />
     <ClInclude Include="ResolveCachingColor.h" />
+    <ClInclude Include="WorkerThread.h" />
     <ClInclude Include="TextPlacer.h" />
     <ClInclude Include="UTF16.h" />
     <ClInclude Include="UTF8.h" />
@@ -320,6 +321,7 @@
     <ClCompile Include="UTF8.cpp" />
     <ClCompile Include="WindowDef.cpp" />
     <ClCompile Include="WindowManager.cpp" />
+    <ClCompile Include="WorkerThread.cpp" />
     <ClCompile Include="XModemCRC.cpp" />
     <ClCompile Include="ZipFileProxy.cpp" />
   </ItemGroup>

PortabilityLayer/PortabilityLayer.vcxproj.filters

@@ -462,6 +462,9 @@
     <ClInclude Include="FileBrowserUI.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="WorkerThread.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="CFileStream.cpp">
@@ -737,5 +740,8 @@
     <ClCompile Include="FileBrowserUI.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="WorkerThread.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>

PortabilityLayer/WorkerThread.cpp

@@ -0,0 +1,152 @@
+#include "WorkerThread.h"
+#include "HostSystemServices.h"
+#include "HostThreadEvent.h"
+
+#include <stdlib.h>
+#include <new>
+
+namespace PortabilityLayer
+{
+	class WorkerThreadImpl final : public WorkerThread
+	{
+	public:
+		WorkerThreadImpl();
+
+		bool Init();
+		void Destroy() override;
+
+		void AsyncExecuteTask(Callback_t callback, void *context) override;
+
+	private:
+		~WorkerThreadImpl() override;
+
+		static int StaticThreadFuncThunk(void *context);
+		int ThreadFunc();
+
+		HostThreadEvent *m_wakeSignal;
+		HostThreadEvent *m_wakeConsumedSignal;
+
+		Callback_t m_waitingCallback;
+		void *m_waitingContext;
+
+		bool m_terminated;
+		bool m_threadRunning;
+	};
+}
+
+void PortabilityLayer::WorkerThreadImpl::Destroy()
+{
+	this->~WorkerThreadImpl();
+	free(this);
+}
+
+void PortabilityLayer::WorkerThreadImpl::AsyncExecuteTask(PortabilityLayer::WorkerThread::Callback_t callback, void *context)
+{
+	m_waitingCallback = callback;
+	m_waitingContext = context;
+	m_wakeSignal->Signal();
+	m_wakeConsumedSignal->Wait();
+}
+
+PortabilityLayer::WorkerThreadImpl::WorkerThreadImpl()
+	: m_wakeSignal(nullptr)
+	, m_wakeConsumedSignal(nullptr)
+	, m_waitingCallback(nullptr)
+	, m_waitingContext(nullptr)
+	, m_terminated(false)
+	, m_threadRunning(false)
+{
+}
+
+PortabilityLayer::WorkerThreadImpl::~WorkerThreadImpl()
+{
+	if (m_threadRunning)
+	{
+		m_terminated = true;
+		m_wakeSignal->Signal();
+		m_wakeConsumedSignal->Wait();
+	}
+
+	if (m_wakeSignal)
+		m_wakeSignal->Destroy();
+	if (m_wakeConsumedSignal)
+		m_wakeConsumedSignal->Destroy();
+}
+
+
+int PortabilityLayer::WorkerThreadImpl::StaticThreadFuncThunk(void *context)
+{
+	return static_cast<PortabilityLayer::WorkerThreadImpl*>(context)->ThreadFunc();
+}
+
+int PortabilityLayer::WorkerThreadImpl::ThreadFunc()
+{
+	m_wakeSignal->Wait();
+	m_wakeConsumedSignal->Signal();
+
+	for (;;)
+	{
+		m_wakeSignal->Wait();
+
+		if (m_terminated)
+		{
+			m_wakeConsumedSignal->Signal();
+			return 0;
+		}
+		else
+		{
+			Callback_t callback = m_waitingCallback;
+			void *context = m_waitingContext;
+			m_wakeConsumedSignal->Signal();
+
+			callback(context);
+		}
+	}
+}
+
+bool PortabilityLayer::WorkerThreadImpl::Init()
+{
+	HostSystemServices *sysServices = HostSystemServices::GetInstance();
+
+	m_wakeSignal = sysServices->CreateThreadEvent(true, false);
+	if (!m_wakeSignal)
+		return false;
+
+	m_wakeConsumedSignal = sysServices->CreateThreadEvent(true, false);
+	if (!m_wakeConsumedSignal)
+		return false;
+
+	if (!sysServices->CreateThread(PortabilityLayer::WorkerThreadImpl::StaticThreadFuncThunk, this))
+		return false;
+
+	m_threadRunning = true;
+	m_wakeSignal->Signal();
+	m_wakeConsumedSignal->Wait();
+
+	return true;
+}
+
+
+PortabilityLayer::WorkerThread::WorkerThread()
+{
+}
+
+PortabilityLayer::WorkerThread::~WorkerThread()
+{
+}
+
+PortabilityLayer::WorkerThread *PortabilityLayer::WorkerThread::Create()
+{
+	void *storage = malloc(sizeof(PortabilityLayer::WorkerThreadImpl));
+	if (!storage)
+		return nullptr;
+
+	PortabilityLayer::WorkerThreadImpl *thread = new (storage) PortabilityLayer::WorkerThreadImpl();
+	if (!thread->Init())
+	{
+		thread->Destroy();
+		return nullptr;
+	}
+
+	return thread;
+}

PortabilityLayer/WorkerThread.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace PortabilityLayer
+{
+	class HostThreadEvent;
+
+	class WorkerThread
+	{
+	public:
+		typedef void(*Callback_t)(void *context);
+
+		static WorkerThread *Create();
+		virtual void Destroy() = 0;
+
+		virtual void AsyncExecuteTask(Callback_t callback, void *context) = 0;
+
+	protected:
+		WorkerThread();
+		virtual ~WorkerThread();
+	};
+}