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
20 int 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
39 int main(void)
40 {
41 test_harness_set_timeout(300);
42 return test_harness(test_futex, "futex_bench");
43 }
44
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