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# InterruptibleQueue.py
#
# Copyright (C) 2016 Carlos Garcia Campos <carlosgc@gnome.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
from threading import Lock, Condition
from collections import deque
import sys
class InterruptibleQueue:
"""Simpler implementation of Queue that uses wait with a timeout to make join interruptile"""
def __init__(self):
self._queue = deque()
self._mutex = Lock()
self._finished_condition = Condition(self._mutex)
self._not_empty_condition = Condition(self._mutex)
self._n_unfinished_tasks = 0
def task_done(self):
self._finished_condition.acquire()
try:
n_unfinished = self._n_unfinished_tasks - 1
if n_unfinished == 0:
self._finished_condition.notify_all()
self._n_unfinished_tasks = n_unfinished
finally:
self._finished_condition.release()
def join(self):
self._finished_condition.acquire()
try:
while self._n_unfinished_tasks:
self._finished_condition.wait(sys.float_info.max)
finally:
self._finished_condition.release()
def put(self, item):
self._mutex.acquire()
try:
self._queue.append(item)
self._n_unfinished_tasks += 1
self._not_empty_condition.notify()
finally:
self._mutex.release()
def get(self):
self._not_empty_condition.acquire()
try:
while not len(self._queue):
self._not_empty_condition.wait()
return self._queue.popleft()
finally:
self._not_empty_condition.release()
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