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

Wed Nov 18 15:15:42 EST 2015

- 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
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> Scons-users mailing list
>>>>>>>> Scons-users at scons.org
>>>>>>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> 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
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Scons-users mailing list
>>>>>> Scons-users at scons.org
>>>>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> Scons-users mailing list
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>>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>>
>>>>
>>>
>>> _______________________________________________
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>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>
>>>
>>
>
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