Created
April 25, 2020 07:28
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Python WaitGroup (like Go sync.WaitGroup)
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| import threading # :( | |
| class WaitGroup(object): | |
| """WaitGroup is like Go sync.WaitGroup. | |
| Without all the useful corner cases. | |
| """ | |
| def __init__(self): | |
| self.count = 0 | |
| self.cv = threading.Condition() | |
| def add(self, n): | |
| self.cv.acquire() | |
| self.count += n | |
| self.cv.release() | |
| def done(self): | |
| self.cv.acquire() | |
| self.count -= 1 | |
| if self.count == 0: | |
| self.cv.notify_all() | |
| self.cv.release() | |
| def wait(self): | |
| self.cv.acquire() | |
| while self.count > 0: | |
| self.cv.wait() | |
| self.cv.release() |
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调用wait()会释放Lock，直至该线程被Notify()、NotifyAll()或者超时线程又重新获得Lock.