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