[issue29102] Add an id field to PyInterpreterState.

[Nick Coghlan]

Nick Coghlan added the comment:

It depends on the scope of uniqueness we're after. `threading._counter()` (which is the small-integer-ID debugging counter for threading.Thread names) is a module global in the threading module, so an Initialize/Finalize cycle will reset it.

If we wanted to track "Which Initialize/Finalize cycle is this?" *as well*, it would make more sense to me to have that as a separate "runtime" counter, such that the full coordinates of the current point of execution were:

- runtime counter (How many times has Py_Initialize been called?)
- interpreter counter (Which interpreter is currently active?)
- thread name (Which thread is currently active?)

I'll also note that in the threading module, the main thread is implicitly thread 0 (but named as MainThread) - Thread-1 is the first thread created via threading.Thread. So it may make sense to use a signed numeric ID, with 0 being the main interpreter, 1 being the first subinterpreter, and negative IDs being errors.

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<http://bugs.python.org/issue29102>
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