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Copy pathcommon.py
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89 lines (67 loc) · 2.39 KB
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# Copyright (c) Quectel Wireless Solution, Co., Ltd.All Rights Reserved.
#
# Licensed 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 _thread
class Waiter(object):
def __init__(self):
self.__info = None # usr information for notifier
self.__lock = _thread.allocate_lock()
self.__lock.acquire() # acquire immediately for holding the lock.
self.acquire = self.__lock.acquire
self.release = self.__lock.release
@property
def info(self):
return self.__info
@info.setter
def info(self, info):
self.__info = info
class Condition(object):
"""条件变量(使用互斥锁实现)"""
def __init__(self):
self.__lock = _thread.allocate_lock()
self.__waiters = []
def __create_waiter(self):
waiter = Waiter()
with self.__lock:
self.__waiters.append(waiter)
return waiter
def wait(self):
waiter = self.__create_waiter()
waiter.acquire() # block here, waiting for release in the future.
return waiter.info
def notify(self, n=1, info=None):
with self.__lock:
for waiter in self.__waiters[:n]:
waiter.info = info
waiter.release() # release here, some `wait` method will be unblocked.
self.__waiters.remove(waiter)
def notify_all(self, info=None):
self.notify(n=len(self.__waiters), info=info)
class Event(object):
def __init__(self):
self.__lock = _thread.allocate_lock()
self.flag = False
self.cond = Condition()
def wait(self):
if self.flag is not True:
self.cond.wait()
return self.flag
def set(self):
with self.__lock:
self.flag = True
self.cond.notify_all()
def clear(self):
with self.__lock:
self.flag = False
def is_set(self):
return self.flag