python - Python 实例变量是线程安全的吗？

Question

好的，先检查以下代码:

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()

我面临与上述相同的情况。我真的很想知道 self.Counter 是否是线程安全的，如果不是，我有什么选择？我只能想 threading.RLock() 来锁定这个资源，有更好的主意吗？

Answer 1

您可以使用锁、RLock、信号量、条件、事件和队列。
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