fork 和 thread 和有什么不一样? [英] What is the difference between fork and thread?

问题描述

谁能解释一下 fork 和 thread 的区别?

解决方案

一个 fork 给你一个全新的进程，它是当前进程的副本，具有相同的代码段.随着内存映像的变化(通常这是由于两个进程的不同行为)，您会分离内存映像(写时复制)，但可执行代码保持不变.任务不会共享内存，除非它们使用一些进程间通信 (IPC) 原语.>

一个进程可以有多个线程，每个线程在进程的同一上下文中并行执行.内存和其他资源在线程之间共享，因此共享数据必须通过一些原始和同步对象(如互斥体、条件变量 和 信号量)，可让您避免数据损坏.

Can anyone explain the difference between a fork and a thread?

解决方案

A fork gives you a brand new process, which is a copy of the current process, with the same code segments. As the memory image changes (typically this is due to different behavior of the two processes) you get a separation of the memory images (Copy On Write), however the executable code remains the same. Tasks do not share memory unless they use some Inter Process Communication (IPC) primitive.

One process can have multiple threads, each executing in parallel within the same context of the process. Memory and other resources are shared among threads, therefore shared data must be accessed through some primitive and synchronization objects (like mutexes, condition variables and semaphores) that allow you to avoid data corruption.

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