66 lines
1.5 KiB
Python
66 lines
1.5 KiB
Python
"""
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aiosched: Yet another Python async scheduler
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Copyright (C) 2022 nocturn9x
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https:www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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from typing import Any
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from aiosched.errors import SchedulerError
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from aiosched.internals.syscalls import (
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suspend,
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schedule,
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current_task,
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)
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class Event:
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"""
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An asynchronous, non thread-safe event
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"""
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def __init__(self):
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"""
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Object constructor
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"""
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self.set = False
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self.waiters = set()
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def reset(self):
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"""
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Resets the event's state
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"""
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self.__init__()
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async def trigger(self):
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"""
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Sets the event, waking up all tasks that called
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wait() on it
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"""
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if self.set:
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raise SchedulerError("The event has already been set")
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self.set = True
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for waiter in self.waiters:
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await schedule(waiter)
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async def wait(self) -> Any:
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"""
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Waits until the event is set
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"""
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self.waiters.add(await current_task())
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await suspend() # We get unsuspended by trigger()
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