Illyoung Choi | a9d2c2c | 2019-07-12 13:29:42 -0700 | [diff] [blame^] | 1 | #!/usr/bin/env python3 |
| 2 | |
| 3 | # Copyright 2019-present Open Networking Foundation |
| 4 | # |
| 5 | # Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | # you may not use this file except in compliance with the License. |
| 7 | # You may obtain a copy of the License at |
| 8 | # |
| 9 | # http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | # |
| 11 | # Unless required by applicable law or agreed to in writing, software |
| 12 | # distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | # See the License for the specific language governing permissions and |
| 15 | # limitations under the License. |
| 16 | |
| 17 | """ |
| 18 | Count-down latch |
| 19 | """ |
| 20 | |
| 21 | import threading |
| 22 | import time |
| 23 | |
| 24 | |
| 25 | class CountDownLatch(object): |
| 26 | def __init__(self, count=1): |
| 27 | self.count = count |
| 28 | self.condition = threading.Condition() |
| 29 | |
| 30 | def count_down(self, count=1): |
| 31 | self.condition.acquire() |
| 32 | self.count -= count |
| 33 | if self.count <= 0: |
| 34 | self.condition.notifyAll() |
| 35 | self.condition.release() |
| 36 | |
| 37 | def wait(self, timeout=0): |
| 38 | self.condition.acquire() |
| 39 | start_time = time.time() |
| 40 | |
| 41 | while self.count > 0: |
| 42 | self.condition.wait(timeout) |
| 43 | cur_time = time.time() |
| 44 | if cur_time - start_time >= timeout: |
| 45 | break |
| 46 | |
| 47 | self.condition.release() |
| 48 | if self.count <= 0: |
| 49 | return True |
| 50 | else: |
| 51 | # timeout |
| 52 | return False |
| 53 | |
| 54 | def get_count(self): |
| 55 | return self.count |