Update

Kha/Tools/windows_x64/std/sys/thread/Semaphore.hx

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+package sys.thread;
+
+#if (!target.threaded)
+#error "This class is not available on this target"
+#end
+@:coreApi extern class Semaphore {
+	/**
+		Creates a new semaphore with an initial value.
+	**/
+	public function new(value:Int):Void;
+
+	/**
+		Locks the semaphore.
+		If the value of the semaphore is zero, then the thread will block until it is able to lock the semaphore.
+		If the value is non-zero, it is decreased by one.
+	**/
+	public function acquire():Void;
+
+	/**
+		Try to lock the semaphore.
+		If the value of the semaphore is zero, `false` is returned, else the value is increased.
+
+		If `timeout` is specified, this function will block until the thread is able to acquire the semaphore, or the timout expires.
+		`timeout` is in seconds.
+	**/
+	public function tryAcquire(?timeout:Float):Bool;
+
+	/**
+		Release the semaphore.
+		The value of the semaphore is increased by one.
+	**/
+	public function release():Void;
+}