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