29 lines
676 B
Python
29 lines
676 B
Python
from asyncio import Event, get_event_loop
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class TaskGroup:
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def __init__(self, loop=None):
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self._loop = loop or get_event_loop()
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self._tasks = set()
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self.done = Event()
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def __len__(self):
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return len(self._tasks)
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def add(self, coro):
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task = self._loop.create_task(coro)
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self._tasks.add(task)
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self.done.clear()
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task.add_done_callback(self._remove)
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return task
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def _remove(self, task):
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self._tasks.remove(task)
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if len(self._tasks) < 1:
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self.done.set()
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def cancel(self):
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for task in self._tasks:
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task.cancel()
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self.done.set()
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