psched.c~

设有二元函数 f(x,y) = f(x) + f(y) 其中：f(x) = f(x-1) * x (x>1) f(x) = 1 (x=

/*
      *      Filename           : psched.c
      * copyright         : (C) 2006 by zhanghonglie
                                : 父进程创建 3 个子进程为它们设置不同的优先数和调
      *      Function
度策略
*/
#include <stdio.h>
#include <stdlib.h>
#include <sched.h>
#include <sys/time.h>
#include <sys/resource.h>
int main(int argc, char *argv[])
{
   int i,j,status;
   int pid[3]; 
   struct sched_param p[3];
for(i=0; i<3;i++){
if((pid[i]=fork()) >0){
     p[i].sched_priority = (argv[i+1] != NULL) ? atoi(argv[i+1]):10;
     sched_setscheduler(pid[i],(argv[i+4] != NULL) ? atoi(argv[i+4]) :SCHED_OTHER,&p[i]);
     setpriority(PRIO_PROCESS,pid[i],(argv[i+1] != NULL) ? atoi(argv[i+1]):10);
}
else{
 sleep(1);
 for(i=0; i<10; i++){
 printf("Child PID = %d priority =
%d\n",getpid(),getpriority(PRIO_PROCESS,0));
          sleep(1);
       }
         exit( EXIT_SUCCESS);
     }
   }
  printf("My child %d policy is %d\n",pid[0],sched_getscheduler(pid[0]));
  printf("My child %d policy is %d\n",pid[1],sched_getscheduler(pid[1]));
  printf("My child %d policy is %d\n",pid[2],sched_getscheduler(pid[2]));
  return EXIT_SUCCESS;
}