mirror of
https://github.com/python/cpython.git
synced 2024-11-24 02:15:30 +08:00
74 lines
1.5 KiB
Python
74 lines
1.5 KiB
Python
#
|
|
# Analogue of `multiprocessing.connection` which uses queues instead of sockets
|
|
#
|
|
# multiprocessing/dummy/connection.py
|
|
#
|
|
# Copyright (c) 2006-2008, R Oudkerk
|
|
# Licensed to PSF under a Contributor Agreement.
|
|
#
|
|
|
|
__all__ = [ 'Client', 'Listener', 'Pipe' ]
|
|
|
|
from queue import Queue
|
|
|
|
|
|
families = [None]
|
|
|
|
|
|
class Listener(object):
|
|
|
|
def __init__(self, address=None, family=None, backlog=1):
|
|
self._backlog_queue = Queue(backlog)
|
|
|
|
def accept(self):
|
|
return Connection(*self._backlog_queue.get())
|
|
|
|
def close(self):
|
|
self._backlog_queue = None
|
|
|
|
address = property(lambda self: self._backlog_queue)
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, exc_tb):
|
|
self.close()
|
|
|
|
|
|
def Client(address):
|
|
_in, _out = Queue(), Queue()
|
|
address.put((_out, _in))
|
|
return Connection(_in, _out)
|
|
|
|
|
|
def Pipe(duplex=True):
|
|
a, b = Queue(), Queue()
|
|
return Connection(a, b), Connection(b, a)
|
|
|
|
|
|
class Connection(object):
|
|
|
|
def __init__(self, _in, _out):
|
|
self._out = _out
|
|
self._in = _in
|
|
self.send = self.send_bytes = _out.put
|
|
self.recv = self.recv_bytes = _in.get
|
|
|
|
def poll(self, timeout=0.0):
|
|
if self._in.qsize() > 0:
|
|
return True
|
|
if timeout <= 0.0:
|
|
return False
|
|
with self._in.not_empty:
|
|
self._in.not_empty.wait(timeout)
|
|
return self._in.qsize() > 0
|
|
|
|
def close(self):
|
|
pass
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, exc_tb):
|
|
self.close()
|