/usr/share/pyshared/qpid/concurrency.py is in python-qpid 0.22+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
import compat, inspect, time
def synchronized(meth):
args, vargs, kwargs, defs = inspect.getargspec(meth)
scope = {}
scope["meth"] = meth
exec """
def %s%s:
%s
%s._lock.acquire()
try:
return meth%s
finally:
%s._lock.release()
""" % (meth.__name__, inspect.formatargspec(args, vargs, kwargs, defs),
repr(inspect.getdoc(meth)), args[0],
inspect.formatargspec(args, vargs, kwargs, defs,
formatvalue=lambda x: ""),
args[0]) in scope
return scope[meth.__name__]
class Waiter(object):
def __init__(self, condition):
self.condition = condition
def wait(self, predicate, timeout=None):
passed = 0
start = time.time()
while not predicate():
if timeout is None:
# XXX: this timed wait thing is not necessary for the fast
# condition from this module, only for the condition impl from
# the threading module
# using the timed wait prevents keyboard interrupts from being
# blocked while waiting
self.condition.wait(3)
elif passed < timeout:
self.condition.wait(timeout - passed)
else:
return bool(predicate())
passed = time.time() - start
return True
def notify(self):
self.condition.notify()
def notifyAll(self):
self.condition.notifyAll()
class Condition:
def __init__(self, lock):
self.lock = lock
self.waiters = []
self.waiting = []
def notify(self):
assert self.lock._is_owned()
if self.waiting:
self.waiting[0].wakeup()
def notifyAll(self):
assert self.lock._is_owned()
for w in self.waiting:
w.wakeup()
def wait(self, timeout=None):
assert self.lock._is_owned()
if not self.waiters:
self.waiters.append(compat.selectable_waiter())
sw = self.waiters.pop(0)
self.waiting.append(sw)
try:
st = self.lock._release_save()
sw.wait(timeout)
finally:
self.lock._acquire_restore(st)
self.waiting.remove(sw)
self.waiters.append(sw)
def gc(self):
assert self.lock._is_owned()
while self.waiters:
sw = self.waiters.pop(0)
sw.close()
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