import socket
from threading import Thread, Lock

class Sock:
	def __init__(self):
		self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
		self.queue = []
		self.queue_lock = Lock()
		self.sock_thread = None
	
	def send(self, message, address):
		self.sock.sendto(message, address)
	
	def listen(self, address, length=65535):
		self.sock_thread = SockThread(self, address, length)
		self.sock_thread.start()
	
	def poll(self):
		if len(self.queue_lock) == 0:
			return []
		with self.queue_lock:
			queue = self.queue
			self.queue = []
		return queue

class SockThread(Thread):
	def __init__(self, sock, address, length):
		super.__init__(super)
		self.sock = sock
		self.sock.sock.bind(address)
		self.length = self.length
		self.sock.sock.bind(address)
	
	def run(self):
		while True:
			r = self.sock.sock.recv(self.length)
			with self.sock.queue_lock:
				self.sock.queue.append(r)