75 lines
1.6 KiB
Python
75 lines
1.6 KiB
Python
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#
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# Analogue of `multiprocessing.connection` which uses queues instead of sockets
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#
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# multiprocessing/dummy/connection.py
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#
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# Copyright (c) 2006-2008, R Oudkerk
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# Licensed to PSF under a Contributor Agreement.
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#
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__all__ = [ 'Client', 'Listener', 'Pipe' ]
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from queue import Queue
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families = [None]
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class Listener(object):
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def __init__(self, address=None, family=None, backlog=1):
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self._backlog_queue = Queue(backlog)
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def accept(self):
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return Connection(*self._backlog_queue.get())
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def close(self):
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self._backlog_queue = None
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address = property(lambda self: self._backlog_queue)
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, exc_tb):
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self.close()
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def Client(address):
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_in, _out = Queue(), Queue()
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address.put((_out, _in))
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return Connection(_in, _out)
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def Pipe(duplex=True):
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a, b = Queue(), Queue()
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return Connection(a, b), Connection(b, a)
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class Connection(object):
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def __init__(self, _in, _out):
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self._out = _out
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self._in = _in
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self.send = self.send_bytes = _out.put
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self.recv = self.recv_bytes = _in.get
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def poll(self, timeout=0.0):
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if self._in.qsize() > 0:
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return True
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if timeout <= 0.0:
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return False
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self._in.not_empty.acquire()
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self._in.not_empty.wait(timeout)
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self._in.not_empty.release()
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return self._in.qsize() > 0
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def close(self):
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pass
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, exc_tb):
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self.close()
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