src/third_party/skia/tools/timer/SysTimer_mach.cpp

   1 /*
   2  * Copyright 2011 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7 #include "SysTimer_mach.h"
   8
   9 static time_value_t mac_cpu_time() {
  10     mach_port_t task = mach_task_self();
  11     if (task == MACH_PORT_NULL) {
  12         time_value_t none = {0, 0};
  13         return none;
  14     }
  15
  16     task_thread_times_info thread_info_data;
  17     mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT;
  18     if (KERN_SUCCESS != task_info(task,
  19                                   TASK_THREAD_TIMES_INFO,
  20                                   reinterpret_cast<task_info_t>(&thread_info_data),
  21                                   &thread_info_count)) {
  22         time_value_t none = {0, 0};
  23         return none;
  24     }
  25
  26     time_value_add(&thread_info_data.user_time, &thread_info_data.system_time)
  27     return thread_info_data.user_time;
  28 }
  29
  30 static double interval_in_ms(time_value_t start_clock, time_value_t end_clock) {
  31     double duration_clock;
  32     if ((end_clock.microseconds - start_clock.microseconds) < 0) {
  33         duration_clock = (end_clock.seconds - start_clock.seconds-1) * 1000;
  34         duration_clock += (1000000 + end_clock.microseconds - start_clock.microseconds) / 1000.0;
  35     } else {
  36         duration_clock = (end_clock.seconds - start_clock.seconds) * 1000;
  37         duration_clock += (end_clock.microseconds - start_clock.microseconds) / 1000.0;
  38     }
  39     return duration_clock;
  40 }
  41
  42 void SysTimer::startWall() {
  43     fStartWall = mach_absolute_time();
  44 }
  45
  46 void SysTimer::startCpu() {
  47     fStartCpu = mac_cpu_time();
  48 }
  49
  50 double SysTimer::endCpu() {
  51     time_value_t end_cpu = mac_cpu_time();
  52     return interval_in_ms(fStartCpu, end_cpu);
  53 }
  54
  55 double SysTimer::endWall() {
  56     uint64_t end_wall = mach_absolute_time();
  57
  58     uint64_t elapsed = end_wall - fStartWall;
  59     mach_timebase_info_data_t sTimebaseInfo;
  60     if (KERN_SUCCESS != mach_timebase_info(&sTimebaseInfo)) {
  61         return 0;
  62     } else {
  63         uint64_t elapsedNano = elapsed * sTimebaseInfo.numer / sTimebaseInfo.denom;
  64         return elapsedNano / 1000000.0;
  65     }
  66 }