test_sched2.c

#include "types.h"
#include "stat.h"
#include "user.h"

int main(int argc, char** argv) {
    int pid;
    int mypid;

    // Change the priority of init process.
    setnice(1, 10);

    // Change the priority of current processes.
    // setnice(getpid(), 2);
    setnice(getpid(), 9); // <--- 부모를 9로 설정

    // Create a child process
    pid = fork();

    if(pid == 0) {
        // Child
        printf(1, "#### State 2 ####\n");
    } else {
        // Parent
        printf(1, "#### State 1 ####\n");
        // Change the priority of parent process
        setnice(pid, 10);
        wait();
        printf(1, "#### State 3 ####\n");
    }

    mypid = getpid();
    printf(1, "PID %d is finished\n", mypid);
    exit();
}