per interpreter storage for C extensions

[Robin Becker]

Chris Mellon wrote:
> On 12/28/06, Robin Becker <robin at reportlab.com> wrote:
>> As part of some django usage I need to get some ReportLab C extensions into a
>> state where they can be safely used with mod_python.
.........
>>
> 
> Just off the top of my head, I'd think that using thread-local storage
> instead of static would work, wouldn't it? I'm not that familiar with
> mod_python but I'm surely each python interpreter is in a different
> thread (if not process) than the others.

I was thinking along those lines and if that were the case then I could use

> PyObject* PyThreadState_GetDict()
> 
>     Return value:  Borrowed reference.
>     Return a dictionary in which extensions can store thread-specific state information.
>     Each extension should use a unique key to use to store state in the dictionary.
>     It is okay to call this function when no current thread state is available.
>     If this function returns NULL, no exception has been raised and the caller should
>     assume no current thread state is available. Changed in version 2.3: Previously
>     this could only be called when a current thread is active, and NULL meant that
>     an exception was raised. 


I'm just not sure that your guess is true though. It seems that

PyThreadState* Py_NewInterpreter() points only to the first thread. Presumably I 
want to initialize my extension only in one of the possibly many threads in an 
interpreter. I think I need something called

PyObject* PyInterpreterState_GetDict()

but I don't think that exists.
-- 
Robin Becker