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93 lines
3.4 KiB
Python
93 lines
3.4 KiB
Python
9 years ago
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#!/usr/bin/env python
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#
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# Copyright 2012 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""KQueue-based IOLoop implementation for BSD/Mac systems."""
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from __future__ import absolute_import, division, print_function, with_statement
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import select
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from tornado.ioloop import IOLoop, PollIOLoop
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assert hasattr(select, 'kqueue'), 'kqueue not supported'
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class _KQueue(object):
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"""A kqueue-based event loop for BSD/Mac systems."""
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def __init__(self):
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self._kqueue = select.kqueue()
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self._active = {}
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def fileno(self):
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return self._kqueue.fileno()
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def close(self):
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self._kqueue.close()
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def register(self, fd, events):
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if fd in self._active:
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raise IOError("fd %d already registered" % fd)
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self._control(fd, events, select.KQ_EV_ADD)
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self._active[fd] = events
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def modify(self, fd, events):
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self.unregister(fd)
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self.register(fd, events)
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def unregister(self, fd):
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events = self._active.pop(fd)
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self._control(fd, events, select.KQ_EV_DELETE)
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def _control(self, fd, events, flags):
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kevents = []
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if events & IOLoop.WRITE:
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kevents.append(select.kevent(
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fd, filter=select.KQ_FILTER_WRITE, flags=flags))
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if events & IOLoop.READ or not kevents:
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# Always read when there is not a write
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kevents.append(select.kevent(
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fd, filter=select.KQ_FILTER_READ, flags=flags))
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# Even though control() takes a list, it seems to return EINVAL
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# on Mac OS X (10.6) when there is more than one event in the list.
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for kevent in kevents:
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self._kqueue.control([kevent], 0)
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def poll(self, timeout):
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kevents = self._kqueue.control(None, 1000, timeout)
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events = {}
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for kevent in kevents:
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fd = kevent.ident
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if kevent.filter == select.KQ_FILTER_READ:
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events[fd] = events.get(fd, 0) | IOLoop.READ
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if kevent.filter == select.KQ_FILTER_WRITE:
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if kevent.flags & select.KQ_EV_EOF:
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# If an asynchronous connection is refused, kqueue
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# returns a write event with the EOF flag set.
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# Turn this into an error for consistency with the
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# other IOLoop implementations.
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# Note that for read events, EOF may be returned before
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# all data has been consumed from the socket buffer,
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# so we only check for EOF on write events.
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events[fd] = IOLoop.ERROR
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else:
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events[fd] = events.get(fd, 0) | IOLoop.WRITE
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if kevent.flags & select.KQ_EV_ERROR:
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events[fd] = events.get(fd, 0) | IOLoop.ERROR
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return events.items()
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class KQueueIOLoop(PollIOLoop):
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def initialize(self, **kwargs):
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super(KQueueIOLoop, self).initialize(impl=_KQueue(), **kwargs)
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