[Python-ideas] Re: Expose _PyGC_generation0 for allowing internal use directly from a CPython extension

[Victor Stinner]

He opened https://bugs.python.org/issue38542

It seems like the issue is specific to Python 2.7. Well, see the issue
for more details ;-)

Victor
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[Python-ideas] Re: Expose _PyGC_generation0 for allowing internal use directly from a CPython extension

[GAUDRY Eloi]

ok, I will.
thanks

éloi

From: Guido van Rossum 
Sent: Friday, October 18, 2019 20:26
To: GAUDRY Eloi 
Cc: python-ideas@python.org 
Subject: Re: [Python-ideas] Expose _PyGC_generation0 for allowing internal use 
directly from a CPython extension

This email is not from Hexagon’s Office 365 instance. Please be careful while 
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This looks like an issue for 
bugs.python.org.
 After opening a bug there you could also try to fix this yourself and submit a 
Pull Request (see the Python devguide).

On Fri, Oct 18, 2019 at 3:10 AM GAUDRY Eloi 
mailto:eloi.gau...@fft.be>> wrote:
Hi

I would like to be able to get an handle on PyGC_Head*_PyGC_generation0 from a 
CPython extension.
This is possible when building Python on a Posix host, but not on Windows 
because of a missing PyAPI_DATA wrapping of the said object in the objimpl.h 
header.

Having the possibility to inspect the PyGC_Head here can be very useful when 
customizing the way a garbage-collectable object created from CPython extension 
would be cleaned/inspected, etc.

Any chance this patch could be added to get the same capabilities on Windows 
and Posix platforms ?

Thanks for your feedback,
Eloi



Index: Include/objimpl.h
===
--- Include/objimpl.h (revision 118072)
+++ Include/objimpl.h (working copy)
@@ -258,7 +258,7 @@
 double dummy;  /* force worst-case alignment */
 } PyGC_Head;

-extern PyGC_Head *_PyGC_generation0;
+PyAPI_DATA(PyGC_Head*) _PyGC_generation0;

 #define _Py_AS_GC(o) ((PyGC_Head *)(o)-1)

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[Python-ideas] Re: Expose _PyGC_generation0 for allowing internal use directly from a CPython extension

[Andrew Svetlov]

I suspect this proposal contradicts with CPython movement to close as
many implementation details as possible.

On Fri, Oct 18, 2019 at 9:28 PM Guido van Rossum  wrote:
>
> This looks like an issue for bugs.python.org. After opening a bug there you 
> could also try to fix this yourself and submit a Pull Request (see the Python 
> devguide).
>
> On Fri, Oct 18, 2019 at 3:10 AM GAUDRY Eloi  wrote:
>>
>> Hi
>>
>> I would like to be able to get an handle on PyGC_Head*_PyGC_generation0 from 
>> a CPython extension.
>> This is possible when building Python on a Posix host, but not on Windows 
>> because of a missing PyAPI_DATA wrapping of the said object in the objimpl.h 
>> header.
>>
>> Having the possibility to inspect the PyGC_Head here can be very useful when 
>> customizing the way a garbage-collectable object created from CPython 
>> extension would be cleaned/inspected, etc.
>>
>> Any chance this patch could be added to get the same capabilities on Windows 
>> and Posix platforms ?
>>
>> Thanks for your feedback,
>> Eloi
>>
>>
>>
>> Index: Include/objimpl.h
>> ===
>> --- Include/objimpl.h (revision 118072)
>> +++ Include/objimpl.h (working copy)
>> @@ -258,7 +258,7 @@
>>  double dummy;  /* force worst-case alignment */
>>  } PyGC_Head;
>>
>> -extern PyGC_Head *_PyGC_generation0;
>> +PyAPI_DATA(PyGC_Head*) _PyGC_generation0;
>>
>>  #define _Py_AS_GC(o) ((PyGC_Head *)(o)-1)
>>
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>
>
>
> --
> --Guido van Rossum (python.org/~guido)
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-- 
Thanks,
Andrew Svetlov
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[Python-ideas] Re: Expose _PyGC_generation0 for allowing internal use directly from a CPython extension

[Guido van Rossum]

This looks like an issue for bugs.python.org. After opening a bug there you
could also try to fix this yourself and submit a Pull Request (see the
Python devguide).

On Fri, Oct 18, 2019 at 3:10 AM GAUDRY Eloi  wrote:

> Hi
>
> I would like to be able to get an handle on PyGC_Head*_PyGC_generation0
> from a CPython extension.
> This is possible when building Python on a Posix host, but not on Windows
> because of a missing PyAPI_DATA wrapping of the said object in the
> objimpl.h header.
>
> Having the possibility to inspect the PyGC_Head here can be very useful
> when customizing the way a garbage-collectable object created from CPython
> extension would be cleaned/inspected, etc.
>
> Any chance this patch could be added to get the same capabilities on
> Windows and Posix platforms ?
>
> Thanks for your feedback,
> Eloi
>
>
>
> Index: Include/objimpl.h
> ===
> --- Include/objimpl.h (revision 118072)
> +++ Include/objimpl.h (working copy)
> @@ -258,7 +258,7 @@
>  double dummy;  /* force worst-case alignment */
>  } PyGC_Head;
>
> -extern PyGC_Head *_PyGC_generation0;
> +PyAPI_DATA(PyGC_Head*) _PyGC_generation0;
>
>  #define _Py_AS_GC(o) ((PyGC_Head *)(o)-1)
>
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>


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