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问题描述
有人知道此代码是否是线程安全的，还是在调用timer2.Change时必须使用锁?
Does anyone know if this code would be thread safe, or do I have to use lock when calling timer2.Change?
Timer timer1 = new Timer(timerCallback1);
Timer timer2 = new Timer(timerCallback2);
timer1.Change(5000, 5000);
timer2.Change(3000, 3000);
public void timerCallback1(object state)
{
timer1.Change(Timeout.Infinite, Timeout.Infinite);
timer2.Change(Timeout.Infinite, Timeout.Infinite);
DoStuff();
timer1.Change(5000, 5000);
timer2.Change(3000, 3000);
}
推荐答案
从某种意义上说，对Change的调用实际上不会破坏计时器，这是线程安全的".
It's "thread-safe" in the sense that the call to Change won't actually corrupt the timer.
但是，从某种意义上来说，这绝对不是一种线程安全的"竞争条件(当您进入DoStuff时，无法确保timerCallback2不在运行).
However, it's not "thread-safe" in the sense that you definitely have a race condition (it's not possible to ensure that timerCallback2 isn't running when you're in DoStuff).
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