Experimental Physics and
Industrial Control System

The error is as below:
>>> import cothread
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/cothread-2.3-py2.7-macosx-10.6-x86_64.egg/cothread/__init__.py", line 41, in <module>
    from cothread import *
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/cothread-2.3-py2.7-macosx-10.6-x86_64.egg/cothread/cothread.py", line 82, in <module>
    import coselect
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/cothread-2.3-py2.7-macosx-10.6-x86_64.egg/cothread/coselect.py", line 60, in <module>
    _select_poll = _select.poll
AttributeError: 'module' object has no attribute 'poll'

which is caused by the line 60 in coselect.py.
( _select_poll = _select.poll )

The platform is not tested here, which caused the import error.

Guobao


On 2/9/12 8:10 AM, [email protected] wrote:

From: Shen, Guobao [mailto:[email protected]]

I am using exact the version 2.3 which is from that link.
Did not try your git repo version yet.

Ah.

I *thought* that cothread was working properly under OSX, it was the last time I tried ... which may have been too long ago.

That's a shame, I've just made a 2.4 release, which won't address your problem.

Can you take a closer look and tell me what's happening?  I'm puzzled that you're reporting that cothread is using poll(), because I have the following lines in coselect.py:

import platform as _platform
if hasattr(_select, 'poll'):
     if _platform.system() == 'Darwin':
         # Unfortunately it would appear that Apple's implementation of the
         # poll() system call is incomplete: it returns POLLNVAL for devices!
         # Apparently kqueue and poll fail on anything in /dev (I suppose they
         # work on ordinary files and sockets?)
         #   So if this is your platform, sorry, we have to use select.
         poll_block = poll_block_select
     else:
         # This is the preferred case.
         poll_block = poll_block_poll


The poll_block_select() function does its best to emulate poll() using select(), and it worked last time I looked, at least I thought so.  Can you check that, for example, that this code is actually working (maybe _platform.system() has changed, for example?)

--
Guobao Shen
Bldg. 902-B, 17 Cornell Avenue
National Synchrotron Light Source II
Brookhaven National Laboratory
Upton, New York 11973
Tel.	: +1 (631) 344 7540
Fax.	: +1 (631) 344 8085
http://www.bnl.gov/nsls2

Replies:

RE: cothread problem on Mac osx michael.abbott

RE: cothread problem on Mac osx michael.abbott

References:

cothread problem on Mac osx Shen, Guobao

RE: cothread problem on Mac osx michael.abbott

RE: cothread problem on Mac osx Shen, Guobao

RE: cothread problem on Mac osx michael.abbott

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