Operating-system/test_nice.c at main · dev2yup/Operating-system · GitHub

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

void test_nice()
{
    int pid, nice;

    printf(1, "case 1. get nice value of init process: ");
    if (getnice(1) == 5)
        printf(1, "OK\n");
    else
        printf(1, "WRONG\n");

    printf(1, "case 2. get nice value of non-existing process: ");
    if (getnice(100) == -1)
        printf(1, "OK\n");
    else
        printf(1, "WRONG\n");

    printf(1, "case 3. set nice value of current process: ");
    pid = getpid();
    setnice(pid, 3);
    if (getnice(pid) == 3)
        printf(1, "OK\n");
    else
        printf(1, "WRONG\n");

    printf(1, "case 4. set nice value of non-existing process: ");
    if (setnice(188, 3) == -1)
        printf(1, "OK\n");
    else
        printf(1, "WRONG\n");

    printf(1, "case 5. set wrong nice value of current process: ");
    if (setnice(pid, -1) == -1 && setnice(pid, 11) == -1)
        printf(1, "OK\n");
    else
        printf(1, "WRONG\n");

    printf(1, "case 6. get nice value of forked process: ");
    nice = getnice(pid);
    pid = fork();
    if (pid == 0) { // child
        if (getnice(getpid()) == nice) {
            printf(1, "OK\n");
            exit();
        }
        else {
            printf(1, "WRONG\n");
            exit();
        }
    }
    else { // parent
        wait();
    }
}

int main(void)
{
    printf(1, "=== TEST START ===\n");
    test_nice();
    printf(1, "=== TEST END ===\n");
    exit();
}