操作系统复习 MITS6.1810 lab util 记录

lab util

sleep

• 介绍：主要用来熟悉下环境以及代码结构。
  

  
  

  
  
  • See kernel/sysproc.c for the xv6 kernel code that implements the sleep system call (look for sys_sleep), user/user.h for the C definition of sleep callable from a user program, and user/usys.S for the assembler code that jumps from user code into the kernel for sleep.
    

  
  
• 代码：
  1. #include "kernel/types.h"
  2. #include "user/user.h"
  4. int main(int argc, char *argv[])
  5. {
  6.   if (argc <= 1) {
  7.     fprintf(2, "usage: sleep `time`...\n");
  8.   }
  9.   
  10.   int tick_num = atoi(argv[1]);
  11.   sleep(tick_num);
  12.   
  13.   exit(0);
  14. }

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