| #!/usr/bin/env python3 |
| |
| # Copyright 2019-present Open Networking Foundation |
| # |
| # 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. |
| |
| """ |
| Count-down latch |
| """ |
| |
| import threading |
| import time |
| |
| |
| class CountDownLatch(object): |
| def __init__(self, count=1): |
| self.count = count |
| self.condition = threading.Condition() |
| |
| def count_down(self, count=1): |
| self.condition.acquire() |
| self.count -= count |
| if self.count <= 0: |
| self.condition.notifyAll() |
| self.condition.release() |
| |
| def wait(self, timeout=0): |
| self.condition.acquire() |
| start_time = time.time() |
| |
| while self.count > 0: |
| self.condition.wait(timeout) |
| cur_time = time.time() |
| if cur_time - start_time >= timeout: |
| break |
| |
| self.condition.release() |
| if self.count <= 0: |
| return True |
| else: |
| # timeout |
| return False |
| |
| def get_count(self): |
| return self.count |