LimitedWorker_old.swift

	class LimitedWorker {
	    private let concurrentQueue = dispatch_queue_create("com.khanlou.concurrent.queue", DISPATCH_QUEUE_CONCURRENT)
	    private let semaphore: dispatch_semaphore_t
	    
	    init(limit: Int) {
	    	semaphore = dispatch_semaphore_create(limit)
	    }
	
	    func enqueueWork(work: () -> ()) {
	        dispatch_async(concurrentQueue) {
	            dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER)
	            work()
	            dispatch_semaphore_signal(semaphore)
	        }
	    }
	}