How to understand the sleep () and pthread_join () functions in c threads

This article shows you how to understand the sleep () and pthread_join () functions in c threads. The content is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

The execution of threads needs cpu resources, and when cpu is used, each thread carries out "polling", that is, round time slices, regardless of priority, if a thread executes, and the time slice allocated to him is up, he will hand over the power of cpu execution, which will be executed by other threads waiting for cpu (a cpu can only execute one thread at a time).

The function of sleep () is to suspend the thread currently executing cpu, hand over the cpu, and let other threads waiting for cpu to execute

Test program:

1 # include 2 # include 3 # include 4 void * fun (void * p) {5 int iPreo; 6 for