1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #define _GNU_SOURCE
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <stdio.h>
9*4882a593Smuzhiyun #include <sys/syscall.h>
10*4882a593Smuzhiyun #include <time.h>
11*4882a593Smuzhiyun #include <unistd.h>
12*4882a593Smuzhiyun #include <linux/futex.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "utils.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define ITERATIONS 100000000
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define futex(A, B, C, D, E, F) syscall(__NR_futex, A, B, C, D, E, F)
19*4882a593Smuzhiyun
test_futex(void)20*4882a593Smuzhiyun int test_futex(void)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun struct timespec ts_start, ts_end;
23*4882a593Smuzhiyun unsigned long i = ITERATIONS;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun clock_gettime(CLOCK_MONOTONIC, &ts_start);
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun while (i--) {
28*4882a593Smuzhiyun unsigned int addr = 0;
29*4882a593Smuzhiyun futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun clock_gettime(CLOCK_MONOTONIC, &ts_end);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun return 0;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
main(void)39*4882a593Smuzhiyun int main(void)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun test_harness_set_timeout(300);
42*4882a593Smuzhiyun return test_harness(test_futex, "futex_bench");
43*4882a593Smuzhiyun }
44