98 lines
3.3 KiB
Python
98 lines
3.3 KiB
Python
"""\
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@file poll.py
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@author Bob Ippolito
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Copyright (c) 2005-2006, Bob Ippolito
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Copyright (c) 2007, Linden Research, Inc.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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"""
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import sys
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import select
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import socket
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import errno
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import traceback
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from time import sleep
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import time
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from eventlet import greenlib
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from eventlet.hubs import hub
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EXC_MASK = select.POLLERR | select.POLLHUP | select.POLLNVAL
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READ_MASK = select.POLLIN
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WRITE_MASK = select.POLLOUT
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class Hub(hub.BaseHub):
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def __init__(self, clock=time.time):
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super(Hub, self).__init__(clock)
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self.poll = select.poll()
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def add_descriptor(self, fileno, read=None, write=None, exc=None):
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oldmask = self.get_fn_mask(self.readers.get(fileno), self.writers.get(fileno))
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super(Hub, self).add_descriptor(fileno, read, write, exc)
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mask = self.get_fn_mask(read, write)
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if mask != oldmask:
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# Only need to re-register this fileno if the mask changes
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self.poll.register(fileno, mask)
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def get_fn_mask(self, read, write):
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mask = 0
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if read is not None:
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mask |= READ_MASK
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if write is not None:
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mask |= WRITE_MASK
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return mask
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def remove_descriptor(self, fileno):
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super(Hub, self).remove_descriptor(fileno)
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try:
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self.poll.unregister(fileno)
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except KeyError:
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pass
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def wait(self, seconds=None):
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readers = self.readers
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writers = self.writers
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excs = self.excs
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if not readers and not writers and not excs:
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if seconds:
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sleep(seconds)
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return
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try:
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presult = self.poll.poll(seconds * 1000.0)
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except select.error, e:
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if e.args[0] == errno.EINTR:
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return
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raise
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SYSTEM_EXCEPTIONS = self.SYSTEM_EXCEPTIONS
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for fileno, event in presult:
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for dct, mask in ((readers, READ_MASK), (writers, WRITE_MASK), (excs, EXC_MASK)):
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func = dct.get(fileno)
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if func is not None and event & mask:
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try:
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func(fileno)
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except SYSTEM_EXCEPTIONS:
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raise
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except:
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self.squelch_exception(fileno, sys.exc_info())
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