Update

Kha/Tools/windows_x64/std/cpp/_std/sys/io/Process.hx

@@ -105,9 +105,7 @@ class Process {
 	}
 
 	public function exitCode(block:Bool = true):Null<Int> {
-		if (block == false)
-			throw "Non blocking exitCode() not supported on this platform";
-		return NativeProcess.process_exit(p);
+		return NativeProcess.process_exit(p, block);
 	}
 
 	public function close():Void {

Kha/Tools/windows_x64/std/cpp/_std/sys/thread/Condition.hx

@@ -0,0 +1,33 @@
+package sys.thread;
+
+@:coreApi
+class Condition {
+	var c:Dynamic;
+	public function new():Void {
+		c = untyped __global__.__hxcpp_condition_create();
+	}
+
+	public function acquire():Void {
+		untyped __global__.__hxcpp_condition_acquire(c);
+	}
+
+	public function tryAcquire():Bool {
+		return untyped __global__.__hxcpp_condition_try_acquire(c);
+	}
+
+	public function release():Void {
+		untyped __global__.__hxcpp_condition_release(c);
+	}
+
+	public function wait():Void {
+		untyped __global__.__hxcpp_condition_wait(c);
+	}
+
+	public function signal():Void {
+		untyped __global__.__hxcpp_condition_signal(c);
+	}
+
+	public function broadcast():Void {
+		untyped __global__.__hxcpp_condition_broadcast(c);
+	}
+}

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

@@ -0,0 +1,22 @@
+package sys.thread;
+
+@:coreApi
+class Semaphore {
+	var m:Dynamic;
+
+	public function new(value:Int) {
+		m = untyped __global__.__hxcpp_semaphore_create(value);
+	}
+
+	public function acquire():Void {
+		untyped __global__.__hxcpp_semaphore_acquire(m);
+	}
+
+	public function tryAcquire(?timeout:Float):Bool {
+		return untyped __global__.__hxcpp_semaphore_try_acquire(m, timeout == null ? 0 : (timeout:Float));
+	}
+
+	public function release():Void {
+		untyped __global__.__hxcpp_semaphore_release(m);
+	}
+}