Mac 上的 system() 函数不支持多线程？

发布于 2024-12-19 07:39:44 字数 386 浏览 2 评论 0原文

我尝试创建一些线程，通过 Mac 上的 system() 函数来 ping 不同的服务器。代码如下：

sprintf(str,"#!/bin/sh\n ping -c 3 -t 3 -o %d.%d.%d.%d \n",dataIP1[0],dataIP1[1],dataIP1[2],dataIP1[3]);
int ret =system(str);

但我发现如果有一个服务器不可用，最后一个线程必须花费超过 3 秒才能 ping 该服务器，而且即使该服务器可用。所以我猜测system()函数不支持多线程。看起来它内部有一个locker，所以即使你同时在不同的线程中调用它，它也只能一项一项地完成工作。

正确吗？

原文

I try to create some threads to ping different servers by system() function on Mac. The code looks like this:

sprintf(str,"#!/bin/sh\n ping -c 3 -t 3 -o %d.%d.%d.%d \n",dataIP1[0],dataIP1[1],dataIP1[2],dataIP1[3]);
int ret =system(str);

But I found if there was a server unavailable, the last threads have to cost more than 3s to ping this servers and also even if this server is available. So I guess that the system() function does not support multi-thread. It looks like there is a locker inside itself, so it can only do the job one by one even you invoke it in different thread at the same time.

Is it correct?

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