diff --git a/semaphore.js b/semaphore.js
index ff640d3..cd59d03 100644
--- a/semaphore.js
+++ b/semaphore.js
@@ -79,33 +79,34 @@ function Semaphore(cap)
 			self.release_raw();
 		}
 	};
+	/// Returns a lambda that, when executed, runs `using(func)` and returns the awaitable promise.
+	this.bind_using = (func) => { return () => self.using(func); };
 }
 
-/// Create a Mutex
-Semaphore.Mutex = () => new Semaphore(1);
+/// Create a mutex (single cap semaphore)
+Semaphore.mutex = () => new Semaphore(1);
 
 
-const sem_example = async () => {
-	let semaphore = Semaphore.Mutex();
+const sem_example = async (locks) => {
+	let semaphore = new Semaphore(locks || 1); //Semaphore.Mutex();
 
-	return await Promise.all([
-		semaphore.using(async () => {
-			for(let i=0;i<10;i++) {
-				await new Promise(resolve => setTimeout(resolve, 100));
-				console.log(`first: ${i}`);
-			}
-			return 10;
-		}),
-		semaphore.using(async () => {
-			for(let i=0;i<15;i++) {
-				await new Promise(resolve => setTimeout(resolve, 75));
-				console.log(`second: ${i}`);
+	const gen_runner = (name, num, time) => {
+		if(!time || time < 0) return semaphore.bind_using(() => {
+			for(let i=0;i<num;i++) console.log(`${name}: ${i}`);
+			return num;
+		}); 
+		else return semaphore.bind_using(async () => {
+			for(let i=0;i<num;i++) {
+				await new Promise(resolve => setTimeout(resolve, time));
+				console.log(`${name}: ${i}`);
 			}
-			return 15;	
-		}),
-		semaphore.using(() => {
-			for(let i=0;i<500;i++) console.log(`third ${i}`);
-			return 500;
-		}),
+			return num;
+		});
+	};
+
+	return await Promise.all([
+		gen_runner("first", 10, 100)(),
+		gen_runner("second", 15, 75)(),
+		gen_runner("third", 500)(),
 	]);
 };