LXR linux/tools/testing/selftests/powerpc/benchmarks/futex

   1/*
   2 * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
   3 * Licensed under GPLv2.
   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
  20int 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
  39int main(void)
  40{
  41        return test_harness(test_futex, "futex_bench");
  42}
  43