RE: cothread problem on Mac osx

[<michael.abbott@diamond.ac.uk>]

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?)

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