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"""Event loop mixins."""

import threading
from . import events

_global_lock = threading.Lock()


class _LoopBoundMixin:
    _loop = None

    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