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/*
* Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
* Licensed under GPLv2.
*/
#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)
{
return test_harness(test_futex, "futex_bench");
}
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