c# 中的原始数据类型是原子的(线程安全的)吗? [英] Are primitive data types in c# atomic (thread safe)?

问题描述

例如，多线程时是否需要锁定bool值?

For example, do I need to lock a bool value when multithreading?

推荐答案

没有原子类型这样的东西.只有操作可以是原子的.

There is no such thing as an atomic type. Only operations can be atomic.

读取和写入适合单个字的数据类型(在 32 位处理器上为 int，在 64 位处理器上为 long)在技术上是原子的""，但抖动和/或处理器可以决定对指令重新排序，从而产生意外的竞争条件，因此您需要使用 lock 序列化访问，使用 Interlocked 类写入(在某些情况下读取)，或声明变量 volatile.

Reading and writing a data type that fits into a single word (int on a 32-bit processor, long on a 64-bit processor) is technically "atomic", but the jitter and/or processor can decide to reorder instructions and thus create unexpected race conditions, so you either need to serialize access with lock, use the Interlocked class for writes (and in some cases reads), or declare the variable volatile.

简短的回答是:如果两个不同的线程可能访问同一个字段/变量，并且其中至少有一个正在写入，则需要使用某种锁定.对于通常是 Interlocked 类的基本类型.

The short answer is: If two different threads may access the same field/variable and at least one of them will be writing, you need to use some sort of locking. For primitive types that's generally the Interlocked class.

这篇关于c# 中的原始数据类型是原子的(线程安全的)吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！