1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
4 */
5
6#define _GNU_SOURCE
7
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 100000000
17
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