oasis-root

mixins.py (803B)

"""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