/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/posixbase.py

class _SocketWaker(log.Logger, styles.Ephemeral):
"""
The I{self-pipe trick<http://cr.yp.to/docs/selfpipe.html>}, implemented
using a pair of sockets rather than pipes (due to the lack of support in
select() on Windows for pipes), used to wake up the main loop from
another thread.
"""
disconnected = 0

def __init__(self, reactor):
"""Initialize.
"""
self.reactor = reactor
# Following select_trigger (from asyncore)'s example;
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
server.bind(('127.0.0.1', 0))
server.listen(1)
client.connect(server.getsockname())
reader, clientaddr = server.accept()
client.setblocking(0)
reader.setblocking(0)
self.r = reader
self.w = client
self.fileno = self.r.fileno

def wakeUp(self):
"""Send a byte to my connection.
"""
try:
util.untilConcludes(self.w.send, 'x')
except socket.error, (err, msg):
if err != errno.WSAEWOULDBLOCK:
raise

def doRead(self):
"""Read some data from my connection.
"""
try:
self.r.recv(8192)
except socket.error:
pass

def connectionLost(self, reason):
self.r.close()

self.w.close()