Experimental Physics and
Industrial Control System

Juan Carlos Guzman <[email protected]> · Tue, 10 Mar 2009 15:28:17 +1100

Hello Michael,

I tried to run the cothread library on MacOSX (Leopard) with Python

2.5.4 and the following error is displayed:

>>> from cothread.catools import *
>>> Exception caught by readline hook
Traceback (most recent call last):

 File "build/bdist.macosx-10.3-i386/egg/cothread/input_hook.py",

line 72, in _readline_hook

    poll_list, timeout = _scheduler.poll_scheduler(ready_list)

 File "build/bdist.macosx-10.3-i386/egg/cothread/cothread.py", line

282, in __scheduler

    self.__schedule_loop()

 File "build/bdist.macosx-10.3-i386/egg/cothread/cothread.py", line

355, in __schedule_loop

    self.__wakeup_poll(self.__poll_suspend(delay))

 File "build/bdist.macosx-10.3-i386/egg/cothread/cothread.py", line

507, in __wakeup_poll

    for poller in self.__poll_queue[file]:
KeyError: 0

This error is repeated multiple times and the only way to kill it is

via kill command. I'm using numpy 1.1.1 and greenlet 0.2

A few things I found trying to make it work on my Mac:

1) MacOSX comes with Python 2.5.1 which for some reason, the select

module does not support poll() method and therefore the cothread

library fails when assigning POLL's constants. I recommend to upgrade

to Python 2.5.4 which fixes that issue.

2) Even with Python 2.5.4, the select module does not have the POLLMSG

attribute. According to the poll.h header, MacOSX (based on BSD UNIX

kernel) does not support POLLMSG. I tried to set the POLLMSG attribute

on coselect.py to 0 without success.

3) This issue does not appear in Linux.

Any idea how to solve this issue for Mac? Is the POLLMSG attribute

used later in the code? thanks in advance.

  Juan Carlos.

----------
Juan Carlos Guzman
Software Engineer
CSIRO Australia Telescope National Facility (ATNF)
P.O.Box 76, Epping NSW 1710, Australia
Phone: +61 2 9372 4457
Fax: +61 2 9372 4310
Email: [email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System