[neko] support semaphores

std/neko/_std/sys/thread/Semaphore.hx

@@ -0,0 +1,26 @@
+package sys.thread;
+
+@:coreApi class Semaphore {
+	var s:Dynamic;
+
+	public function new(value:Int):Void {
+		s = semaphore_create(value);
+	}
+
+	public function acquire():Void {
+		semaphore_acquire(s);
+	}
+
+	public function tryAcquire(?timeout:Float):Bool {
+		return semaphore_try_acquire(s, timeout);
+	}
+
+	public function release():Void {
+		semaphore_release(s);
+	}
+
+	static var semaphore_create = neko.Lib.loadLazy("std", "semaphore_create", 1);
+	static var semaphore_try_acquire = neko.Lib.loadLazy("std", "semaphore_try_acquire", 2);
+	static var semaphore_acquire = neko.Lib.loadLazy("std", "semaphore_acquire", 1);
+	static var semaphore_release = neko.Lib.loadLazy("std", "semaphore_release", 1);
+}

tests/threads/src/cases/TestSemaphore.hx

@@ -1,11 +1,8 @@
 package cases;
 
-#if !neko
 import sys.thread.Semaphore;
-#end
 
 class TestSemaphore extends utest.Test {
-	#if !neko
 	function test() {
 		var m = new Semaphore(3);
 		m.acquire();
@@ -17,5 +14,4 @@ class TestSemaphore extends utest.Test {
 		m.release();
 		m.release();
 	}
-	#end
 }