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87 lines
2.7 KiB
Python
87 lines
2.7 KiB
Python
#
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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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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of author nor the names of any contributors may be
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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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 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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