[Scons-users] Is the warning about missing pywin32 extensions on parallel builds still needed?

Wed Nov 18 15:18:16 EST 2015

I just stripped those from the python 2.7.4 release notes.  I remembered
these issues from a high-performance computing environment that used python
for process management.

Hope that is useful.

V/R,
William

On Wed, Nov 18, 2015 at 8:15 PM, William Blevins <wblevins001 at gmail.com>
wrote:

> - Issue #16327: The subprocess module no longer leaks file descriptors
>   used for stdin/stdout/stderr pipes to the child when fork() fails.
>
> - Issue #14396: Handle the odd rare case of waitpid returning 0 when not
>   expected in subprocess.Popen.wait().
>
>
> - Issue #15756: subprocess.poll() now properly handles errno.ECHILD to
>   return a returncode of 0 when the child has already exited or cannot
>   be waited on.
>
>
> - Issue #14252: Fix subprocess.Popen.terminate() to not raise an error
> under
>   Windows when the child process has already exited.
>
>
> These are the 4 issues fixed in 2.7.4 related to subprocess.
>
>
> Issue #16327 was the big one but there were some other potential culprits
> depending on what capabilities we were using.
>
>
> V/R,
>
> William
>
> On Wed, Nov 18, 2015 at 7:57 PM, Bill Deegan <bill at baddogconsulting.com>
> wrote:
>
>> William,
>>
>> This bug?
>> http://bugs.python.org/issue16327
>>
>> -Bill
>>
>> On Wed, Nov 18, 2015 at 11:52 AM, Bill Deegan <bill at baddogconsulting.com>
>> wrote:
>>
>>> William,
>>>
>>> Thanks!
>>> Wasn't aware.  Might you have a pointer to a description of the issue?
>>>
>>> -Bill
>>>
>>> On Wed, Nov 18, 2015 at 10:55 AM, William Blevins <wblevins001 at gmail.com
>>> > wrote:
>>>
>>>> In the rare case you didn't know, keep in mind that some early minor
>>>> versions for python 2.7 had leaking file descriptors with subprocess, so
>>>> make sure that the SCons docs require and test against Python 2.7.4+
>>>>
>>>> V/R,
>>>> William
>>>>
>>>> On Wed, Nov 18, 2015 at 5:33 PM, Bill Deegan <bill at baddogconsulting.com
>>>> > wrote:
>>>>
>>>>> Currently the pywin32 extensions are used by the code.
>>>>> If it's not available I believe it disables parallel builds on win32.
>>>>> I'm looking at switching the code to use subprocess, but it may take a
>>>>> little bit to verify that such a change is stable.
>>>>>
>>>>> On Wed, Nov 18, 2015 at 12:06 AM, Erling D. Andersen <
>>>>> e.d.andersen at mosek.com> wrote:
>>>>>
>>>>>> Everything is working fine using Python 2.7.
>>>>>>
>>>>>> However, I do not understand why the latest Scons prints out:
>>>>>>
>>>>>> scons: warning: you do not seem to have the pywin32 extensions
>>>>>> installed;
>>>>>>         parallel (-j) builds may not work reliably with open Python
>>>>>> files
>>>>>>
>>>>>> on Windows. That seems a legacy issue and the warning is no longer
>>>>>> needed. So why not remove it?
>>>>>>
>>>>>>
>>>>>> On Tue, Nov 17, 2015 at 3:15 PM, William Blevins <
>>>>>> wblevins001 at gmail.com> wrote:
>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Tue, Nov 17, 2015 at 11:51 AM, Erling D. Andersen <
>>>>>>> e.d.andersen at mosek.com> wrote:
>>>>>>>
>>>>>>>> Did you find out of something? It is still in Scons version 2.4.1
>>>>>>>> run with Python 2.7.
>>>>>>>>
>>>>>>>
>>>>>>> I assume that you mean the warning still exists in SCons 2.4.1.
>>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>> Thanks for the good work with new version. It worked out of the box.
>>>>>>>>
>>>>>>>
>>>>>>> Did version 2.3.6 not work of the box? What is the context?
>>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>> Erling
>>>>>>>>
>>>>>>>> On Fri, Aug 28, 2015 at 5:08 AM, Bill Deegan <
>>>>>>>> bill at baddogconsulting.com> wrote:
>>>>>>>>
>>>>>>>>> Richard,
>>>>>>>>>
>>>>>>>>> That's a very good question.
>>>>>>>>> I'll have to look into it.
>>>>>>>>>
>>>>>>>>> -Bill
>>>>>>>>>
>>>>>>>>> On Thu, Aug 27, 2015 at 6:30 AM, Richard Viney <
>>>>>>>>> richard.viney at gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Hi all,
>>>>>>>>>>
>>>>>>>>>> When running parallel builds under SCons 2.3.6 and Python 2.7.10
>>>>>>>>>> on Windows you get the following warning if the pywin32 extensions aren’t
>>>>>>>>>> installed:
>>>>>>>>>>
>>>>>>>>>> scons: warning: you do not seem to have the pywin32 extensions
>>>>>>>>>> installed;
>>>>>>>>>>         parallel (-j) builds may not work reliably with open
>>>>>>>>>> Python files.
>>>>>>>>>>
>>>>>>>>>> This was discussed back in 2008 here:
>>>>>>>>>> http://comments.gmane.org/gmane.comp.programming.tools.scons.user/17858
>>>>>>>>>>
>>>>>>>>>> It seems that there were ancient Python versions with threading
>>>>>>>>>> bugs and the pywin32 extensions were needed to work around these issues.
>>>>>>>>>>
>>>>>>>>>> I’m curious whether this still applies given that Python >= 2.6
>>>>>>>>>> is now required? Is this warning still relevant and is pywin32 needed?
>>>>>>>>>>
>>>>>>>>>> Thanks,
>>>>>>>>>> Richard
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Scons-users mailing list
>>>>>>>>>> Scons-users at scons.org
>>>>>>>>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
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>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Erling D. Andersen
>>>>>>>>
>>>>>>>> MOSEK APS
>>>>>>>> Fruebjergvej 3, Box 16,
>>>>>>>> DK-2100 Copenhagen O
>>>>>>>>
>>>>>>>> Ph: +4539179907
>>>>>>>> Mo: +4523629520
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> Scons-users mailing list
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>>>>>>>>
>>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Erling D. Andersen
>>>>>>
>>>>>> MOSEK APS
>>>>>> Fruebjergvej 3, Box 16,
>>>>>> DK-2100 Copenhagen O
>>>>>>
>>>>>> Ph: +4539179907
>>>>>> Mo: +4523629520
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Scons-users mailing list
>>>>>> Scons-users at scons.org
>>>>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>>>>
>>>>>>
>>>>>
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>>>>>
>>>>
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>>>
>>
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