How to use the tempora.timing function in tempora

def free(host, port, timeout=float('Inf')):
	"""
	Wait for the specified port to become free (dropping or rejecting
	requests). Return when the port is free or raise a Timeout if timeout has
	elapsed.

	Timeout may be specified in seconds or as a timedelta.
	If timeout is None or ∞, the routine will run indefinitely.

	>>> free('localhost', find_available_local_port())
	"""
	if not host:
		raise ValueError("Host values of '' or None are not allowed.")

	timer = timing.Timer(timeout)

	while not timer.expired():
		try:
			# Expect a free port, so use a small timeout
			Checker(timeout=0.1).assert_free(host, port)
			return
		except PortNotFree:
			# Politely wait.
			time.sleep(0.1)

	raise Timeout("Port {port} not free on {host}.".format(**locals()))
wait_for_free_port = free

def free(host, port, timeout=float('Inf')):
	"""
	Wait for the specified port to become free (dropping or rejecting
	requests). Return when the port is free or raise a Timeout if timeout has
	elapsed.

	Timeout may be specified in seconds or as a timedelta.
	If timeout is None or ∞, the routine will run indefinitely.

	>>> free('localhost', find_available_local_port())
	"""
	if not host:
		raise ValueError("Host values of '' or None are not allowed.")

	timer = timing.Timer(timeout)

	while not timer.expired():
		try:
			# Expect a free port, so use a small timeout
			Checker(timeout=0.1).assert_free(host, port)
			return
		except PortNotFree:
			# Politely wait.
			time.sleep(0.1)

	raise Timeout("Port {port} not free on {host}.".format(**locals()))

Wait for the specified port to become occupied (accepting requests).
	Return when the port is occupied or raise a Timeout if timeout has
	elapsed.

	Timeout may be specified in seconds or as a timedelta.
	If timeout is None or ∞, the routine will run indefinitely.

	>>> occupied('localhost', find_available_local_port(), .1)
	Traceback (most recent call last):
	...
	Timeout: Port ... not bound on localhost.
	"""
	if not host:
		raise ValueError("Host values of '' or None are not allowed.")

	timer = timing.Timer(timeout)

	while not timer.expired():
		try:
			Checker(timeout=.5).assert_free(host, port)
			# Politely wait
			time.sleep(0.1)
		except PortNotFree:
			# port is occupied
			return

	raise Timeout("Port {port} not bound on {host}.".format(**locals()))

Wait for the specified port to become occupied (accepting requests).
	Return when the port is occupied or raise a Timeout if timeout has
	elapsed.

	Timeout may be specified in seconds or as a timedelta.
	If timeout is None or ∞, the routine will run indefinitely.

	>>> occupied('localhost', find_available_local_port(), .1) # doctest: +IGNORE_EXCEPTION_DETAIL
	Traceback (most recent call last):
	    ...
	Timeout: Port ... not bound on localhost.
	"""
	if not host:
		raise ValueError("Host values of '' or None are not allowed.")

	timer = timing.Timer(timeout)

	while not timer.expired():
		try:
			Checker(timeout=.5).assert_free(host, port)
			# Politely wait
			time.sleep(0.1)
		except PortNotFree:
			# port is occupied
			return

	raise Timeout("Port {port} not bound on {host}.".format(**locals()))
wait_for_occupied_port = occupied