The video decoding thread efficiently waits for a video to be created before doing anything, rather than sleeping for 2ms in a loop. Reduces the CPU usage of the video worker thread to ~0% when no videos are loaded.

src/modules/thread/threads.cpp

@@ -43,7 +43,7 @@ Lock::~Lock()
 }
 
 EmptyLock::EmptyLock()
-	: mutex(0)
+	: mutex(nullptr)
 {
 }
 
@@ -119,5 +119,30 @@ MutexRef::operator Mutex*() const
 	return mutex;
 }
 
+Mutex *MutexRef::operator->() const
+{
+	return mutex;
+}
+
+ConditionalRef::ConditionalRef()
+	: conditional(newConditional())
+{
+}
+
+ConditionalRef::~ConditionalRef()
+{
+	delete conditional;
+}
+
+ConditionalRef::operator Conditional*() const
+{
+	return conditional;
+}
+
+Conditional *ConditionalRef::operator->() const
+{
+	return conditional;
+}
+
 } // thread
 } // love