fork系统调用的应用 [英] Applications of fork system call

问题描述

fork用于创建从其调用的过程的副本.通常，此后是对exec函数家族的调用.除此以外，还有叉的用法吗?我能想到一个.使用管道功能进行IPC.

fork is used to create a copy of process from which its called. This is typically followed by calls to exec family of functions. Are there any usages of fork other than this? I can think of one. Doing IPC with pipe functions.

推荐答案

是的.开始一个过程，进行一些数据初始化，然后产生多个工作程序是很常见的.它们在地址空间中都有相同的数据，即写时复制.

Yes of course. It's quite common to start a process, do some data initialization and then spawn multiple workers. They all have the same data in their address space and it's Copy On Write.

另一个常见的事情是让主进程为传入的每个连接监听TCP套接字和fork().这样，在并行处理现有连接的同时，新连接可以立即得到处理.

Another common thing is to have the main process listen to a TCP socket and fork() for every connection that comes in. That way new connections can be handled immediately while existing connections are handled in parallel.

我想您忘记了在fork()之后，两个进程都可以访问fork()之前的进程中存在的所有数据.

I think you're forgetting that after a fork(), both processes have access to all data that existed in the process before the fork().

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