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_mach.h"
9
10//Time
11#include <mach/mach.h>
12#include <mach/mach_time.h>
13
14static time_value_t macCpuTime() {
15    mach_port_t task = mach_task_self();
16    if (task == MACH_PORT_NULL) {
17        time_value_t none = {0, 0};
18        return none;
19    }
20
21    task_thread_times_info thread_info_data;
22    mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT;
23    if (KERN_SUCCESS != task_info(task,
24                 TASK_THREAD_TIMES_INFO,
25                 reinterpret_cast<task_info_t>(&thread_info_data),
26                 &thread_info_count))
27    {
28        time_value_t none = {0, 0};
29        return none;
30    }
31
32    time_value_add(&thread_info_data.user_time, &thread_info_data.system_time)
33    return thread_info_data.user_time;
34}
35
36static double intervalInMSec(const time_value_t start_clock
37                           , const time_value_t end_clock)
38{
39    double duration_clock;
40    if ((end_clock.microseconds - start_clock.microseconds) < 0) {
41        duration_clock = (end_clock.seconds - start_clock.seconds-1)*1000;
42        duration_clock += (1000000
43                           + end_clock.microseconds
44                           - start_clock.microseconds) / 1000.0;
45    } else {
46        duration_clock = (end_clock.seconds - start_clock.seconds)*1000;
47        duration_clock += (end_clock.microseconds - start_clock.microseconds)
48                           / 1000.0;
49    }
50    return duration_clock;
51}
52
53void BenchSysTimer::startWall() {
54    this->fStartWall = mach_absolute_time();
55}
56void BenchSysTimer::startCpu() {
57    this->fStartCpu = macCpuTime();
58}
59
60double BenchSysTimer::endCpu() {
61    time_value_t end_cpu = macCpuTime();
62    return intervalInMSec(this->fStartCpu, end_cpu);
63}
64double BenchSysTimer::endWall() {
65    uint64_t end_wall = mach_absolute_time();
66
67    uint64_t elapsed = end_wall - this->fStartWall;
68    mach_timebase_info_data_t sTimebaseInfo;
69    if (KERN_SUCCESS != mach_timebase_info(&sTimebaseInfo)) {
70        return 0;
71    } else {
72        uint64_t elapsedNano = elapsed * sTimebaseInfo.numer
73                               / sTimebaseInfo.denom;
74        return elapsedNano / 1000000;
75    }
76}
77