Re: cothread problem on Mac osx

["Shen, Guobao" <shengb@bnl.gov>]

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, michael.abbott@diamond.ac.uk wrote:
> From: Shen, Guobao [mailto:shengb@bnl.gov]
> > 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
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