mirror of https://github.com/nocturn9x/giambio.git
109 lines
2.9 KiB
Python
109 lines
2.9 KiB
Python
"""
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Task synchronization primitives
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Copyright (C) 2020 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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http://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 collections import deque
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from typing import Any, Optional
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from giambio.traps import event_wait, event_set, current_task, suspend, schedule_tasks, current_loop
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from giambio.exceptions import GiambioError
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class Event:
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"""
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A class designed similarly to threading.Event (not
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thread-safe though)
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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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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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pause() on it
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"""
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if self.set:
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raise GiambioError("The event has already been set")
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await event_set(self)
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async def wait(self):
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"""
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Waits until the event is set
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"""
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await event_wait(self)
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class Queue:
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"""
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An asynchronous FIFO queue similar to asyncio.Queue
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that uses a collections.deque object for the underlying
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data representation. This queue is *NOT* thread-safe
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"""
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def __init__(self, maxsize: Optional[int] = None):
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"""
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Object constructor
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"""
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self.maxsize = maxsize
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self.getters = deque()
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self.putters = deque()
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self.container = deque(maxlen=maxsize)
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async def put(self, item: Any):
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"""
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Pushes an element onto the queue. If the
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queue is full, waits until there's
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enough space for the queue
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"""
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if not self.maxsize or len(self.container) < self.maxsize:
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if self.getters:
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task = self.getters.popleft()
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loop = await current_loop()
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loop._data[task] = item
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await schedule_tasks([task])
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else:
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self.container.append(item)
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else:
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self.putters.append(await current_task())
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print(self.putters)
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await suspend()
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async def get(self) -> Any:
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"""
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Pops an element off the queue. Blocks until
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an element is put onto it again if the queue
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is empty
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"""
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if self.container:
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if self.putters:
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await schedule_tasks([self.putters.popleft()])
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return self.container.popleft()
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else:
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self.getters.append(await current_task())
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return await suspend() |