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- from queue import Full, Queue
- from time import monotonic as time
-
-
-
- class Dequeue(Queue):
- def putleft(self, item, block=True, timeout=None):
- with self.not_full:
- if self.maxsize > 0:
- if not block:
- if self._qsize() >= self.maxsize:
- raise Full
- elif timeout is None:
- while self._qsize() >= self.maxsize:
- self.not_full.wait()
- elif timeout < 0:
- raise ValueError("'timeout' must be a non-negative number")
- else:
- endtime = time() + timeout
- while self._qsize() >= self.maxsize:
- remaining = endtime - time()
- if remaining <= 0.0:
- raise Full
- self.not_full.wait(remaining)
- self._putleft(item)
- self.unfinished_tasks += 1
- self.not_empty.notify()
-
- def putleft_nowait(self, item):
- return self.putleft(item, block=False)
-
- def _putleft(self, item):
- self.queue.appendleft(item)
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