Remove rw_lock changes as they don't improve performance.

Author: DAShoe1

core/os/rw_lock.cpp

@@ -45,32 +45,38 @@
 #endif
 
 class RWLock {
-	struct ThreadMutex;
-
-	static int threads_number;
-
-	mutable ThreadMutex *threads_data = nullptr;
-
-	static int get_thread_pos();
-
-	void init() const;
+	mutable THREADING_NAMESPACE::shared_timed_mutex mutex;
 
 public:
 	// Lock the RWLock, block if locked by someone else.
-	void read_lock() const;
+	_ALWAYS_INLINE_ void read_lock() const {
+		mutex.lock_shared();
+	}
 
 	// Unlock the RWLock, let other threads continue.
-	void read_unlock() const;
+	_ALWAYS_INLINE_ void read_unlock() const {
+		mutex.unlock_shared();
+	}
+
+	// Attempt to lock the RWLock for reading. True on success, false means it can't lock.
+	_ALWAYS_INLINE_ bool read_try_lock() const {
+		return mutex.try_lock_shared();
+	}
 
 	// Lock the RWLock, block if locked by someone else.
-	void write_lock();
+	_ALWAYS_INLINE_ void write_lock() {
+		mutex.lock();
+	}
 
 	// Unlock the RWLock, let other threads continue.
-	void write_unlock();
+	_ALWAYS_INLINE_ void write_unlock() {
+		mutex.unlock();
+	}
 
 	// Attempt to lock the RWLock for writing. True on success, false means it can't lock.
-	RWLock();
-	~RWLock();
+	_ALWAYS_INLINE_ bool write_try_lock() {
+		return mutex.try_lock();
+	}
 };
 
 class RWLockRead {