mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-01 00:43:37 +00:00
109 lines
3.7 KiB
Python
109 lines
3.7 KiB
Python
"""Lowest-common-denominator implementations of platform functionality."""
|
|
from __future__ import absolute_import, division, print_function
|
|
|
|
import errno
|
|
import socket
|
|
import time
|
|
|
|
from tornado.platform import interface
|
|
from tornado.util import errno_from_exception
|
|
|
|
|
|
def try_close(f):
|
|
# Avoid issue #875 (race condition when using the file in another
|
|
# thread).
|
|
for i in range(10):
|
|
try:
|
|
f.close()
|
|
except IOError:
|
|
# Yield to another thread
|
|
time.sleep(1e-3)
|
|
else:
|
|
break
|
|
# Try a last time and let raise
|
|
f.close()
|
|
|
|
|
|
class Waker(interface.Waker):
|
|
"""Create an OS independent asynchronous pipe.
|
|
|
|
For use on platforms that don't have os.pipe() (or where pipes cannot
|
|
be passed to select()), but do have sockets. This includes Windows
|
|
and Jython.
|
|
"""
|
|
def __init__(self):
|
|
# Based on Zope select_trigger.py:
|
|
# https://github.com/zopefoundation/Zope/blob/master/src/ZServer/medusa/thread/select_trigger.py
|
|
|
|
self.writer = socket.socket()
|
|
# Disable buffering -- pulling the trigger sends 1 byte,
|
|
# and we want that sent immediately, to wake up ASAP.
|
|
self.writer.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
|
|
|
|
count = 0
|
|
while 1:
|
|
count += 1
|
|
# Bind to a local port; for efficiency, let the OS pick
|
|
# a free port for us.
|
|
# Unfortunately, stress tests showed that we may not
|
|
# be able to connect to that port ("Address already in
|
|
# use") despite that the OS picked it. This appears
|
|
# to be a race bug in the Windows socket implementation.
|
|
# So we loop until a connect() succeeds (almost always
|
|
# on the first try). See the long thread at
|
|
# http://mail.zope.org/pipermail/zope/2005-July/160433.html
|
|
# for hideous details.
|
|
a = socket.socket()
|
|
a.bind(("127.0.0.1", 0))
|
|
a.listen(1)
|
|
connect_address = a.getsockname() # assigned (host, port) pair
|
|
try:
|
|
self.writer.connect(connect_address)
|
|
break # success
|
|
except socket.error as detail:
|
|
if (not hasattr(errno, 'WSAEADDRINUSE') or
|
|
errno_from_exception(detail) != errno.WSAEADDRINUSE):
|
|
# "Address already in use" is the only error
|
|
# I've seen on two WinXP Pro SP2 boxes, under
|
|
# Pythons 2.3.5 and 2.4.1.
|
|
raise
|
|
# (10048, 'Address already in use')
|
|
# assert count <= 2 # never triggered in Tim's tests
|
|
if count >= 10: # I've never seen it go above 2
|
|
a.close()
|
|
self.writer.close()
|
|
raise socket.error("Cannot bind trigger!")
|
|
# Close `a` and try again. Note: I originally put a short
|
|
# sleep() here, but it didn't appear to help or hurt.
|
|
a.close()
|
|
|
|
self.reader, addr = a.accept()
|
|
self.reader.setblocking(0)
|
|
self.writer.setblocking(0)
|
|
a.close()
|
|
self.reader_fd = self.reader.fileno()
|
|
|
|
def fileno(self):
|
|
return self.reader.fileno()
|
|
|
|
def write_fileno(self):
|
|
return self.writer.fileno()
|
|
|
|
def wake(self):
|
|
try:
|
|
self.writer.send(b"x")
|
|
except (IOError, socket.error, ValueError):
|
|
pass
|
|
|
|
def consume(self):
|
|
try:
|
|
while True:
|
|
result = self.reader.recv(1024)
|
|
if not result:
|
|
break
|
|
except (IOError, socket.error):
|
|
pass
|
|
|
|
def close(self):
|
|
self.reader.close()
|
|
try_close(self.writer)
|