baseimage-tutorial-framework/lib/tfw/components/pipe_io_server/deque.py

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2019-05-02 12:53:59 +00:00
from collections import deque
from threading import Lock, Condition
class Deque:
def __init__(self):
self._queue = deque()
self._mutex = Lock()
self._not_empty = Condition(self._mutex)
def pop(self):
with self._mutex:
while not self._queue:
self._not_empty.wait()
return self._queue.pop()
def push(self, item):
self._push(item, self._queue.appendleft)
def push_front(self, item):
self._push(item, self._queue.append)
def _push(self, item, put_method):
with self._mutex:
put_method(item)
self._not_empty.notify()