Python实例变量是线程安全的吗? [英] Are Python instance variables thread-safe?

问题描述

好的，请先检查以下代码:

OK, check following codes first:

class DemoClass():

    def __init__(self):
        #### I really want to know if self.Counter is thread-safe. 
        self.Counter = 0

    def Increase(self):
        self.Counter = self.Counter + 1

    def Decrease(self):
        self.Counter = self.Counter - 1

    def DoThis(self):
        while True:
            Do something

            if A happens:
                self.Increase()
            else:
                self.Decrease()

            time.sleep(randomSecs)

    def DoThat(self):
        while True:
            Do other things

            if B happens:
                self.Increase()
            else:
                self.Decrease()

            time.sleep(randomSecs)

    def ThreadSafeOrNot(self):
        InterestingThreadA = threading.Thread(target = self.DoThis, args = ())
        InterestingThreadA.start()

        InterestingThreadB = threading.Thread(target = self.DoThat, args = ())
        InterestingThreadB.start()

我正面临与上述情况相同的情况.我真的很想知道它对于self.Counter是否是线程安全的，如果没有，我有什么选择?我只能想到threading.RLock()来锁定此资源，还有更​​好的主意吗?

I'm facing same situation as above. I really want to know if it's thread-safe for self.Counter, well if not, what options do I have? I can only think of threading.RLock() to lock this resource, any better idea?

推荐答案

您可以使用锁，RLock，信号量，条件，事件和队列.
这篇文章对我有很大帮助.
检查一下: Laurent Luce的博客

You can use Locks, RLocks, Semaphores, Conditions, Events and Queues.
And this article helped me a lot.
Check it out: Laurent Luce's Blog

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