Ability to reset emulator while running

src/gba/gba-thread.c

@@ -146,6 +146,8 @@ static THREAD_ENTRY _GBAThreadRun(void* context) {
 				ARMRun(&cpu);
 			}
 		}
+
+		int resetScheduled = 0;
 		MutexLock(&threadContext->stateMutex);
 		if (threadContext->state == THREAD_PAUSING) {
 			threadContext->state = THREAD_PAUSED;
@@ -155,10 +157,17 @@ static THREAD_ENTRY _GBAThreadRun(void* context) {
 			threadContext->state = THREAD_INTERRUPTED;
 			ConditionWake(&threadContext->stateCond);
 		}
+		if (threadContext->state == THREAD_RESETING) {
+			threadContext->state = THREAD_RUNNING;
+			resetScheduled = 1;
+		}
 		while (threadContext->state == THREAD_PAUSED) {
 			ConditionWait(&threadContext->stateCond, &threadContext->stateMutex);
 		}
 		MutexUnlock(&threadContext->stateMutex);
+		if (resetScheduled) {
+			ARMReset(&cpu);
+		}
 	}
 
 	while (threadContext->state != THREAD_SHUTDOWN) {
@@ -254,6 +263,14 @@ void GBAThreadEnd(struct GBAThread* threadContext) {
 	MutexUnlock(&threadContext->sync.audioBufferMutex);
 }
 
+void GBAThreadReset(struct GBAThread* threadContext) {
+	MutexLock(&threadContext->stateMutex);
+	_waitOnInterrupt(threadContext);
+	threadContext->state = THREAD_RESETING;
+	ConditionWake(&threadContext->stateCond);
+	MutexUnlock(&threadContext->stateMutex);
+}
+
 void GBAThreadJoin(struct GBAThread* threadContext) {
 	MutexLock(&threadContext->sync.videoFrameMutex);
 	threadContext->sync.videoFrameWait = 0;

src/gba/gba-thread.h

@@ -18,6 +18,7 @@ enum ThreadState {
 	THREAD_INTERRUPTING,
 	THREAD_PAUSED,
 	THREAD_PAUSING,
+	THREAD_RESETING,
 	THREAD_EXITING,
 	THREAD_SHUTDOWN
 };
@@ -82,6 +83,7 @@ void GBAMapOptionsToContext(struct StartupOptions*, struct GBAThread*);
 int GBAThreadStart(struct GBAThread* threadContext);
 int GBAThreadHasStarted(struct GBAThread* threadContext);
 void GBAThreadEnd(struct GBAThread* threadContext);
+void GBAThreadReset(struct GBAThread* threadContext);
 void GBAThreadJoin(struct GBAThread* threadContext);
 
 void GBAThreadInterrupt(struct GBAThread* threadContext);

src/platform/sdl/sdl-events.c

@@ -118,6 +118,9 @@ static void _GBASDLHandleKeypress(struct GBAThread* context, struct GBASDLEvents
 					context->frameCallback = _pauseAfterFrame;
 					GBAThreadUnpause(context);
 					break;
+				case SDLK_r:
+					GBAThreadReset(context);
+					break;
 				default:
 					break;
 				}