On 9/1/2013 5:13 PM, Stefan Behnel wrote:
Antoine Pitrou, 01.09.2013 22:06:
On Sun, 01 Sep 2013 16:02:33 -0400
Terry Reedy wrote:
Speaking of which, it also doesn't work (well) with subinterpreters:
Could someone briefly explain 'subinterpreter' or point me somewhere in
the docs? It appears throughout this thread but there is no index or
glossary entry.
http://docs.python.org/dev/c-api/init.html#sub-interpreter-support
So cpython specific.
Subinterpreters are a somewhat borderline feature that allows embedding
applications to host multiple Python programs in a single process. A
well-known example is mod_wsgi.
Thank you for both the link *and* the explanatory example, which just
what I needed to make the past discussion more intelligible. I imagine
that wsgi uses a sub-interpreter for each user connection.
And extension modules usually don't play well with subinterpreters because
each subinterpreter requires its own separate version of the module and
extension modules are rarely designed to keep their state completely local
to an interpreter, let alone being prepared for having their module init
function be called more than once.
I can see now why this is a bit of a 'hair-puller';-).
--
Terry Jan Reedy
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