Util: Add MutexTryLock

CHANGES

@@ -44,6 +44,7 @@ Misc:
  - GBA Memory: Implement several unimplemented memory access types
  - GBA: Implement bad I/O register loading
  - GBA Memory: Add GBAView* functions for viewing memory directly without bus issues
+ - Util: Add MutexTryLock
 
 0.3.1: (2015-10-24)
 Bugfixes:

src/gba/supervisor/thread.c

@@ -71,13 +71,15 @@ static void _waitUntilNotState(struct GBAThread* threadContext, enum ThreadState
 	while (threadContext->state == oldState) {
 		MutexUnlock(&threadContext->stateMutex);
 
-		MutexLock(&threadContext->sync.videoFrameMutex);
-		ConditionWake(&threadContext->sync.videoFrameRequiredCond);
-		MutexUnlock(&threadContext->sync.videoFrameMutex);
+		if (!MutexTryLock(&threadContext->sync.videoFrameMutex)) {
+			ConditionWake(&threadContext->sync.videoFrameRequiredCond);
+			MutexUnlock(&threadContext->sync.videoFrameMutex);
+		}
 
-		MutexLock(&threadContext->sync.audioBufferMutex);
-		ConditionWake(&threadContext->sync.audioRequiredCond);
-		MutexUnlock(&threadContext->sync.audioBufferMutex);
+		if (!MutexLock(&threadContext->sync.audioBufferMutex)) {
+			ConditionWake(&threadContext->sync.audioRequiredCond);
+			MutexUnlock(&threadContext->sync.audioBufferMutex);
+		}
 
 		MutexLock(&threadContext->stateMutex);
 		ConditionWake(&threadContext->stateCond);

src/platform/3ds/threading.h

@@ -37,6 +37,10 @@ static inline int MutexLock(Mutex* mutex) {
 	return svcWaitSynchronization(*mutex, U64_MAX);
 }
 
+static inline int MutexTryLock(Mutex* mutex) {
+	return svcWaitSynchronization(*mutex, 10);
+}
+
 static inline int MutexUnlock(Mutex* mutex) {
 	return svcReleaseMutex(*mutex);
 }

src/platform/posix/threading.h

@@ -33,6 +33,10 @@ static inline int MutexLock(Mutex* mutex) {
 	return pthread_mutex_lock(mutex);
 }
 
+static inline int MutexTryLock(Mutex* mutex) {
+	return pthread_mutex_trylock(mutex);
+}
+
 static inline int MutexUnlock(Mutex* mutex) {
 	return pthread_mutex_unlock(mutex);
 }

src/platform/psp2/threading.h

@@ -35,6 +35,10 @@ static inline int MutexLock(Mutex* mutex) {
 	return sceKernelLockMutex(*mutex, 1, 0);
 }
 
+static inline int MutexTryLock(Mutex* mutex) {
+	return sceKernelTryLockMutex(*mutex, 1);
+}
+
 static inline int MutexUnlock(Mutex* mutex) {
 	return sceKernelUnlockMutex(*mutex, 1);
 }

src/platform/windows/threading.h

@@ -32,6 +32,13 @@ static inline int MutexLock(Mutex* mutex) {
 	return GetLastError();
 }
 
+static inline int MutexTryLock(Mutex* mutex) {
+	if (TryEnterCriticalSection(mutex)) {
+		return GetLastError();
+	}
+	return 1;
+}
+
 static inline int MutexUnlock(Mutex* mutex) {
 	LeaveCriticalSection(mutex);
 	return GetLastError();

src/util/threading.h

@@ -41,6 +41,11 @@ static inline int MutexLock(Mutex* mutex) {
 	return 0;
 }
 
+static inline int MutexTryLock(Mutex* mutex) {
+	UNUSED(mutex);
+	return 0;
+}
+
 static inline int MutexUnlock(Mutex* mutex) {
 	UNUSED(mutex);
 	return 0;