44 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.4 */5 6#define _GNU_SOURCE7 8#include <stdio.h>9#include <sys/syscall.h>10#include <time.h>11#include <unistd.h>12#include <linux/futex.h>13 14#include "utils.h"15 16#define ITERATIONS 10000000017 18#define futex(A, B, C, D, E, F) syscall(__NR_futex, A, B, C, D, E, F)19 20int test_futex(void)21{22 struct timespec ts_start, ts_end;23 unsigned long i = ITERATIONS;24 25 clock_gettime(CLOCK_MONOTONIC, &ts_start);26 27 while (i--) {28 unsigned int addr = 0;29 futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);30 }31 32 clock_gettime(CLOCK_MONOTONIC, &ts_end);33 34 printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);35 36 return 0;37}38 39int main(void)40{41 test_harness_set_timeout(300);42 return test_harness(test_futex, "futex_bench");43}44