coreinit: add pause/resume functionality

src/Cafe/CafeSystem.cpp

@@ -448,6 +448,8 @@ namespace CafeSystem
 	bool sSystemRunning = false;
 	TitleId sForegroundTitleId = 0;
 
+	bool sTitlePaused = false;
+
 	GameInfo2 sGameInfo_ForegroundTitle;
 
 
@@ -931,6 +933,30 @@ namespace CafeSystem
 		return sSystemRunning;
 	}
 
+	void PauseTitle()
+	{
+		if (!sSystemRunning || sTitlePaused)
+		{
+			return;
+		}
+
+		sTitlePaused = true;
+
+		coreinit::SuspendActiveThreads();
+	}
+
+	void ResumeTitle()
+	{
+		if (!sSystemRunning || !sTitlePaused)
+		{
+			return;
+		}
+
+		sTitlePaused = false;
+
+		coreinit::ResumeActiveThreads();
+	}
+
 	TitleId GetForegroundTitleId()
 	{
 		cemu_assert_debug(sForegroundTitleId != 0);

src/Cafe/CafeSystem.h

@@ -31,6 +31,9 @@ namespace CafeSystem
 	void LaunchForegroundTitle();
 	bool IsTitleRunning();
 
+	void PauseTitle();
+	void ResumeTitle();
+
 	bool GetOverrideArgStr(std::vector<std::string>& args);
 	void SetOverrideArgs(std::span<std::string> args);
 	void UnsetOverrideArgs();

src/Cafe/OS/libs/coreinit/coreinit_Thread.cpp

@@ -94,6 +94,42 @@ namespace coreinit
 		uint32 selectedCore;
 	};
 
+	void SuspendActiveThreads()
+	{
+		if (activeThreadCount == 0)
+		{
+			return;
+		}
+
+		__OSLockScheduler();
+
+		for (sint32 i = 0; i < activeThreadCount; i++)
+		{
+			auto thread = reinterpret_cast<OSThread_t*>(memory_getPointerFromVirtualOffset(activeThread[i]));
+			__OSSuspendThreadNolock(thread);
+		}
+
+		__OSUnlockScheduler();
+	}
+
+	void ResumeActiveThreads()
+	{
+		if (activeThreadCount == 0)
+		{
+			return;
+		}
+
+		__OSLockScheduler();
+
+		for (sint32 i = 0; i < activeThreadCount; i++)
+		{
+			auto thread = reinterpret_cast<OSThread_t*>(memory_getPointerFromVirtualOffset(activeThread[i]));
+			__OSResumeThreadInternal(thread, 1);
+		}
+
+		__OSUnlockScheduler();
+	}
+
 	std::unordered_map<OSThread_t*, OSHostThread*> s_threadToFiber;
 
 	bool __CemuIsMulticoreMode()

src/Cafe/OS/libs/coreinit/coreinit_Thread.h

@@ -508,6 +508,9 @@ namespace coreinit
 
 	void InitializeConcurrency();
 
+	void SuspendActiveThreads();
+	void ResumeActiveThreads();
+
 	bool __CemuIsMulticoreMode();
 
 	OSThread_t* OSGetDefaultThread(sint32 coreIndex);