结合 Interlocked.Increment 和 Interlocked.Exchange

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问题描述

我希望以无锁方式原子地递增静态变量并同时将新值分配给实例字段.目标是让每个对象在创建时获得一个唯一的、递增的 id，这样两个对象就没有机会获得相同的 id.

I wish to atomically increment a static variable and simultaneously assign the new value to an instance field in a lock-free manner. The objective is for each object to get a unique, incrementing id upon creation, such that there is no chance for two objects to get the same id.

下面的代码会实现这个吗?

Will the following code achieve this?

class MyClass
{
    private static int currentOrderingId;
    private int orderingId;

    public MyClass()
    {
        Interlocked.Exchange(ref orderingId, Interlocked.Increment(ref currentOrderingId));
    }
}

推荐答案

你只需要这样做:

orderingId = Interlocked.Increment(ref currentOrderingId);

两个线程不可能接收到相同的值，所以它是线程安全的.

There's no way that two threads could then receive the same value, so it is threadsafe.

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