# A collection which `is_empty` method blocks until it's empty
class ReverseBlockingQueue[E]
	super ConcurrentList[E]

	# Used to block or signal on waiting threads
	private var cond = new PthreadCond

	# Adding the signal to release eventual waiting thread(s)
	redef fun push(e) do
		mutex.lock
		real_collection.push(e)
		mutex.unlock
	end

	# When the Queue is empty, signal any possible waiting thread
	redef fun remove(e) do
		mutex.lock
		real_collection.remove(e)
		if real_collection.is_empty then cond.signal
		mutex.unlock
	end

	# Wait until the Queue is empty
	redef fun is_empty do
		mutex.lock
		while not real_collection.is_empty do self.cond.wait(mutex)
		mutex.unlock
		return true
	end
end