synchronization

问题 I am trouble figuring out how to make a synchronized Python object. I have a class called Observation and a class called Variable that basically looks like (code is simplified to show the essence): class Observation: def __init__(self, date, time_unit, id, meta): self.date = date self.time_unit = time_unit self.id = id self.count = 0 self.data = 0 def add(self, value): if isinstance(value, list): if self.count == 0: self.data = [] self.data.append(value) else: self.data += value self.count +=

问题 I am trouble figuring out how to make a synchronized Python object. I have a class called Observation and a class called Variable that basically looks like (code is simplified to show the essence): class Observation: def __init__(self, date, time_unit, id, meta): self.date = date self.time_unit = time_unit self.id = id self.count = 0 self.data = 0 def add(self, value): if isinstance(value, list): if self.count == 0: self.data = [] self.data.append(value) else: self.data += value self.count +=

问题 If I have two functions doing async with mylock.acquire(): .... Once the lock is released, is it guaranteed that the first to await will win, or is the order selected differently? (e.g. randomly, arbitrarily, latest, etc.) The reason I'm asking, if it is not first-come-first-served, there might easily be a case of starvation where the first function attempting to acquire the lock never gets wins it. 回答1: When we talk about how something works it's important to distinguish guarantee expressed

问题 My question is related to multithreading lock-free synchronization. I wanted to know the following: What are general approaches to achieve this? I read somewhere about LockFreePrimitives like CompareAndExchange (CAS) or DoubleCompareAndExchange (DCA) but no explanation for those were given? Any approaches to MINIMIZE use of locks? How does Java/.NET achieve their concurrent containers? Do they use locks or lock-free synch? Thanks in advance. 回答1: Here are some general approaches that can

问题 I’m looking for a way to maintain a seamless audio track while flipping between front and back camera. Many apps in the market can do this, one example is SnapChat… Solutions should use AVCaptureSession and AVAssetWriter. Also it should explicitly not use AVMutableComposition since there is a bug between AVMutableComposition and AVCaptureSession ATM. Also, I can't afford post processing time. Currently when I change the video input the audio recording skips and becomes out of sync. I’m

来源： https://stackoverflow.com/questions/58197800/set-the-data-in-react-context-from-asynchronous-api-call

来源： https://stackoverflow.com/questions/29981050/concurrent-writing-to-a-file

来源： https://stackoverflow.com/questions/29981050/concurrent-writing-to-a-file

来源： https://stackoverflow.com/questions/56384817/why-wait-with-predicate-solves-the-lost-wakeup-for-condition-variable

来源： https://stackoverflow.com/questions/56384817/why-wait-with-predicate-solves-the-lost-wakeup-for-condition-variable