pctl.h~

设有两个并发执行的父子进程

#include <sys/types.h>
#include <wait.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
typedef void (*sighandler_t)(int);
void sigcat1(){
   printf("\n%d Process increase by 1\n",getpid());
   setpriority(PRIO_PROCESS,getpid(),getpriority(PRIO_PROCESS,getpid())+1);
}
void sigcat2(){
   printf("\n%d Process decrease by 1\n",getpid());
  setpriority(PRIO_PROCESS,getpid(),getpriority(PRIO_PROCESS,getpid())-1);
}