[issue20130] asyncio: implement a synchronous executor if concurrent.futures is missing

[STINNER Victor]

STINNER Victor added the comment:

The synchronous executor has been implemented in Trollius 0.1.1. I now agree with Antoine Pitrou that it's overkill to implement in CPython since only one old platform don't support concurrent.futures. On FreeBSD 6: increase the limit of POSIX semaphore, or upgrade to a more recent FreeBSD version, or use Trollius.

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resolution:  -> invalid
status: open -> closed

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