[Core] Allow locking/unlocking of MutexLock

core/os/safe_binary_mutex.h

@@ -103,6 +103,16 @@ public:
 	~MutexLock() {
 		mutex.unlock();
 	}
+
+	_ALWAYS_INLINE_ void temp_relock() const {
+		mutex.lock();
+	}
+
+	_ALWAYS_INLINE_ void temp_unlock() const {
+		mutex.unlock();
+	}
+
+	// TODO: Implement a `try_temp_relock` if needed (will also need a dummy method below).
 };
 
 #else // No threads.
@@ -119,6 +129,16 @@ public:
 	void unlock() const {}
 };
 
+template <int Tag>
+class MutexLock<SafeBinaryMutex<Tag>> {
+public:
+	MutexLock(const SafeBinaryMutex<Tag> &p_mutex) {}
+	~MutexLock() {}
+
+	void temp_relock() const {}
+	void temp_unlock() const {}
+};
+
 #endif // THREADS_ENABLED
 
 #endif // SAFE_BINARY_MUTEX_H