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Tue Aug 31 23:49:40 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-August/103373.html

Daniel Stutzbach wrote:
> On Tue, Aug 31, 2010 at 4:54 AM, M.-A. Lemburg <mal at egenix.com> wrote:
> 
>> Is it possible to have multiple versions of the lib C loaded
>> on Windows ?
>>
> 
> Yes, and it's a pretty common situation.   The fopen() that I call within a
> DLL may not be the same fopen() called by another DLL.  When writing a DLL
> for Windows, the API must be designed with the assumption that anything
> returned by the C library cannot be passed a different C library.  For
> example, suppose I a expose a function in my DLL that allocates some memory,
> populates it with useful information, and returns a pointer.  I must also
> supply a function to free the memory.  I cannot ask the caller to simply
> call free(), because their free() may not be using the same heap as my
> malloc().

But isn't exactly that a major problem for Python ?

An extension written for a different MS CRT version would
not be able to safely free a buffer allocated by the Python
DLL.

> Likewise, a FILE * isn't safe to pass around, unless I can guarantee that
> the application really is one big happy family compiled against the same
> version of the C library.

According to the MS document I found this also applies to the OS
environment and handles.

Taking all these things together makes it sound like there's
a rather small chance of actually getting PEP 384 working
across Windows compiler upgrades.

Then again, I haven't heard of many people actually running into
those possible issues.

-- 
Marc-Andre Lemburg
eGenix.com

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[Python-Dev] PEP 384 status