mirror of
https://github.com/moparisthebest/SickRage
synced 2024-10-31 23:45:02 -04:00
77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Copyright 2012 Facebook
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
"""Select-based IOLoop implementation.
|
|
|
|
Used as a fallback for systems that don't support epoll or kqueue.
|
|
"""
|
|
from __future__ import absolute_import, division, print_function, with_statement
|
|
|
|
import select
|
|
|
|
from tornado.ioloop import IOLoop, PollIOLoop
|
|
|
|
|
|
class _Select(object):
|
|
"""A simple, select()-based IOLoop implementation for non-Linux systems"""
|
|
def __init__(self):
|
|
self.read_fds = set()
|
|
self.write_fds = set()
|
|
self.error_fds = set()
|
|
self.fd_sets = (self.read_fds, self.write_fds, self.error_fds)
|
|
|
|
def close(self):
|
|
pass
|
|
|
|
def register(self, fd, events):
|
|
if fd in self.read_fds or fd in self.write_fds or fd in self.error_fds:
|
|
raise IOError("fd %s already registered" % fd)
|
|
if events & IOLoop.READ:
|
|
self.read_fds.add(fd)
|
|
if events & IOLoop.WRITE:
|
|
self.write_fds.add(fd)
|
|
if events & IOLoop.ERROR:
|
|
self.error_fds.add(fd)
|
|
# Closed connections are reported as errors by epoll and kqueue,
|
|
# but as zero-byte reads by select, so when errors are requested
|
|
# we need to listen for both read and error.
|
|
self.read_fds.add(fd)
|
|
|
|
def modify(self, fd, events):
|
|
self.unregister(fd)
|
|
self.register(fd, events)
|
|
|
|
def unregister(self, fd):
|
|
self.read_fds.discard(fd)
|
|
self.write_fds.discard(fd)
|
|
self.error_fds.discard(fd)
|
|
|
|
def poll(self, timeout):
|
|
readable, writeable, errors = select.select(
|
|
self.read_fds, self.write_fds, self.error_fds, timeout)
|
|
events = {}
|
|
for fd in readable:
|
|
events[fd] = events.get(fd, 0) | IOLoop.READ
|
|
for fd in writeable:
|
|
events[fd] = events.get(fd, 0) | IOLoop.WRITE
|
|
for fd in errors:
|
|
events[fd] = events.get(fd, 0) | IOLoop.ERROR
|
|
return events.items()
|
|
|
|
|
|
class SelectIOLoop(PollIOLoop):
|
|
def initialize(self, **kwargs):
|
|
super(SelectIOLoop, self).initialize(impl=_Select(), **kwargs)
|