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| // SPDX-License-Identifier: GPL-2.0-only
| /*
| * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
| */
|
| #define _GNU_SOURCE
|
| #include <stdio.h>
| #include <sys/syscall.h>
| #include <time.h>
| #include <unistd.h>
| #include <linux/futex.h>
|
| #include "utils.h"
|
| #define ITERATIONS 100000000
|
| #define futex(A, B, C, D, E, F) syscall(__NR_futex, A, B, C, D, E, F)
|
| int test_futex(void)
| {
| struct timespec ts_start, ts_end;
| unsigned long i = ITERATIONS;
|
| clock_gettime(CLOCK_MONOTONIC, &ts_start);
|
| while (i--) {
| unsigned int addr = 0;
| futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
| }
|
| clock_gettime(CLOCK_MONOTONIC, &ts_end);
|
| printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
|
| return 0;
| }
|
| int main(void)
| {
| test_harness_set_timeout(300);
| return test_harness(test_futex, "futex_bench");
| }
|
|
