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For the connection refused error, the following script fails for me 
(again, on OS X 10.5.4) with the message:
errno: [Errno 61] Connection refused
on most runs. (If xrange(10) is replaced by a smaller range like 
xrange(4) then the script usually runs without error.) Looks like
something in semaphore.c needs fixing, but I've no idea what.
from multiprocessing import Process, Manager
sleeping = Manager().Semaphore(0)
def f():
 sleeping.release()
for _ in xrange(10):
 Process(target=f).start()
for _ in xrange(10):
 sleeping.acquire()