[issue15751] Support subinterpreters in the GIL state API

[Graham Dumpleton]

Graham Dumpleton added the comment:

It is past my bed time and not thinking straight, but I believe Antoine is aligned with what I had in mind, as need multiple thread states per OS thread where each is associated with separate interpreter.

My main reason for allowing NULL to EnsureEX rather than requiring main_interpreter to be explicitly passed, is that way way back in time, my recollection is that getting access to the main interpreter pointer was a pain as you had to iterate over the list of interpreters and assume it was the last one due to it being created first. I don't remember there being a special global variable or function for getting a pointer to the main interpreter. This may well have changed since and there is an easier way do let me know. So saw it as a convenience.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15751>
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