gh-133485: Use _interpreters.call() in InterpreterPoolExecutor

[ericsnowcurrently]

Most importantly, this resolves the issues with functions and types defined in __main__.
It also expands the number of supported objects.

(This is based on gh-133484, thus only the last commit.)

• Issue: Minor InterpreterPoolExecutor Issues #133485

[ericsnowcurrently]

@markshannon, any ideas on why this is happening? It smells like a ceval bug, but it certainly could be something I've done wrong.

[ericsnowcurrently]

ping @markshannon

[neonene]

There seem to be related changes in inspect.getclosurevars() since 83ba8c2:

before:
ClosureVars(nonlocals={},
            globals={'INITIALIZER_STATUS': 'uninitialized'},
            builtins={}, unbound=set())
after:
ClosureVars(nonlocals={},
            globals={},
            builtins={}, unbound=set())

• init() on main (without L26):

  3           RESUME                   0

  5           LOAD_FAST_BORROW         0 (x)
              STORE_GLOBAL             0 (INITIALIZER_STATUS)
              LOAD_CONST               0 (None)
              RETURN_VALUE

• 3.3.5 (2014):

  5           0 LOAD_FAST                0 (x)
              3 STORE_GLOBAL             0 (INITIALIZER_STATUS)
              6 LOAD_CONST               0 (None)
              9 RETURN_VALUE

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @ericsnowcurrently for commit ccc135c 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F133957%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[neonene]

The wasm32-wasi Non-Debug buildbot seems to be unused on merged commits and out of order on PRs. For example: https://buildbot.python.org/#/builders/1373/builds/507

[neonene]

Is the following usage invalid?

from concurrent.futures import InterpreterPoolExecutor
INITIALIZER_STATUS = 'uninitialized'

def init(x):
    global INITIALIZER_STATUS
    INITIALIZER_STATUS = x
    INITIALIZER_STATUS

def get_init_status():
    return INITIALIZER_STATUS

if __name__ == "__main__":
    exe = InterpreterPoolExecutor(initializer=init, initargs=('initialized',))
    f = exe.submit(get_init_status)
    assert f.result() == 'initialized'  # fails
    exe.shutdown(wait=True)