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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 7a240aef1526e56943381dca3fbda139962500f2 authored by Zackery Spytz on 28 November 2020, 21:46:30 UTC, committed by GitHub on 28 November 2020, 21:46:30 UTC 
Fix an error in the news entry for _posixsubprocess multiphase init (GH-23516)
 
Commit 035deee265c7fb227ddc87222fa48761231d8bd7 converted the
_posixsubprocess module to multiphase initialization, but the news entry
mentions the _posixshmem module.
1 parent fa840cc
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Tip revision: 7a240aef1526e56943381dca3fbda139962500f2 authored by Zackery Spytz on 28 November 2020, 21:46:30 UTC
Fix an error in the news entry for _posixsubprocess multiphase init (GH-23516)
Tip revision: 7a240ae
mixins.py 
"""Event loop mixins."""

import threading
from . import events

_global_lock = threading.Lock()

# Used as a sentinel for loop parameter
_marker = object()


class _LoopBoundMixin:
    _loop = None

    def __init__(self, *, loop=_marker):
        if loop is not _marker:
            raise TypeError(
                f'As of 3.10, the *loop* parameter was removed from '
                f'{type(self).__name__}() since it is no longer necessary'
            )

    def _get_loop(self):
        loop = events._get_running_loop()

        if self._loop is None:
            with _global_lock:
                if self._loop is None:
                    self._loop = loop
        if loop is not self._loop:
            raise RuntimeError(f'{self!r} is bound to a different event loop')
        return loop
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