1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "BenchSysTimer_posix.h"
9
10//Time
11#include <time.h>
12
13static double intervalInMSec(const timespec start_clock
14                           , const timespec end_clock)
15{
16    double duration_clock;
17    if ((end_clock.tv_nsec - start_clock.tv_nsec) < 0) {
18        duration_clock = (end_clock.tv_sec - start_clock.tv_sec-1)*1000;
19        duration_clock += (1000000000 + end_clock.tv_nsec - start_clock.tv_nsec)
20                           / 1000000.0;
21    } else {
22        duration_clock = (end_clock.tv_sec - start_clock.tv_sec)*1000;
23        duration_clock += (end_clock.tv_nsec - start_clock.tv_nsec) / 1000000.0;
24    }
25    return duration_clock;
26}
27
28void BenchSysTimer::startWall() {
29    if (-1 == clock_gettime(CLOCK_MONOTONIC, &this->fWall)) {
30        timespec none = {0, 0};
31        this->fWall = none;
32    }
33}
34void BenchSysTimer::startCpu() {
35    if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &this->fCpu)) {
36        timespec none = {0, 0};
37        this->fCpu = none;
38    }
39}
40
41double BenchSysTimer::endCpu() {
42    timespec end_cpu;
43    if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &end_cpu)) {
44        timespec none = {0, 0};
45        end_cpu = none;
46    }
47    return intervalInMSec(this->fCpu, end_cpu);
48}
49
50double BenchSysTimer::endWall() {
51    timespec end_wall;
52    if (-1 == clock_gettime(CLOCK_MONOTONIC, &end_wall)) {
53        timespec none = {0, 0};
54        end_wall = none;
55    }
56    return intervalInMSec(this->fWall, end_wall);
57}
58