| """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 | |