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[J-linux.git] / tools / testing / selftests / powerpc / benchmarks / futex_bench.c
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 }
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