kopia lustrzana https://github.com/peterhinch/micropython-samples
67 wiersze
2.0 KiB
Python
67 wiersze
2.0 KiB
Python
# queue.py: adapted from uasyncio V2
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# Code is based on Paul Sokolovsky's work.
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# This is a temporary solution until uasyncio V3 gets an efficient official version
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import uasyncio as asyncio
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# Exception raised by get_nowait().
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class QueueEmpty(Exception):
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pass
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# Exception raised by put_nowait().
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class QueueFull(Exception):
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pass
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class Queue:
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def __init__(self, maxsize=0):
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self.maxsize = maxsize
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self._queue = []
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def _get(self):
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return self._queue.pop(0)
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async def get(self): # Usage: item = await queue.get()
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while self.empty():
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# Queue is empty, put the calling Task on the waiting queue
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await asyncio.sleep_ms(0)
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return self._get()
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def get_nowait(self): # Remove and return an item from the queue.
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# Return an item if one is immediately available, else raise QueueEmpty.
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if self.empty():
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raise QueueEmpty()
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return self._get()
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def _put(self, val):
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self._queue.append(val)
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async def put(self, val): # Usage: await queue.put(item)
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while self.qsize() >= self.maxsize and self.maxsize:
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# Queue full
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await asyncio.sleep_ms(0)
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# Task(s) waiting to get from queue, schedule first Task
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self._put(val)
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def put_nowait(self, val): # Put an item into the queue without blocking.
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if self.qsize() >= self.maxsize and self.maxsize:
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raise QueueFull()
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self._put(val)
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def qsize(self): # Number of items in the queue.
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return len(self._queue)
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def empty(self): # Return True if the queue is empty, False otherwise.
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return len(self._queue) == 0
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def full(self): # Return True if there are maxsize items in the queue.
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# Note: if the Queue was initialized with maxsize=0 (the default),
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# then full() is never True.
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if self.maxsize <= 0:
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return False
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else:
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return self.qsize() >= self.maxsize
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