// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
 */

#define _GNU_SOURCE

#include <stdio.h>
#include <sys/syscall.h>
#include <time.h>
#include <unistd.h>
#include <linux/futex.h>

#include "utils.h"

#define ITERATIONS 100000000

#define futex(A, B, C, D, E, F)  syscall(__NR_futex, A, B, C, D, E, F)

int test_futex(void)
{
        struct timespec ts_start, ts_end;
        unsigned long i = ITERATIONS;

        clock_gettime(CLOCK_MONOTONIC, &ts_start);

        while (i--) {
                unsigned int addr = 0;
                futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
        }

        clock_gettime(CLOCK_MONOTONIC, &ts_end);

        printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);

        return 0;
}

int main(void)
{
        test_harness_set_timeout(300);
        return test_harness(test_futex, "futex_bench");
}