[issue15751] Add PyGILState_SwitchInterpreter

[Nick Coghlan]

Nick Coghlan added the comment:

Just as they do today, all externally created threads will still go to *one* interpreter when they hit PyGILState_Ensure(). It's just that interpreter won't be the main one.

Since the whole point of the PyGILState API is to support threads that don't have a previously created thread state, there's no getting around the requirement to have a single blessed interpreter that handles all externally created threads in a given process.

It will be up to mod_wsgi (and any other embedding application that uses the new function) to make sure it calls this at a time when there aren't any existing calls to PyGILState that would be disrupted. (Assuming we can't figure out a locking scheme that *ensures* no such threads are running when the switch occurs)

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