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 14 static 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 36 static 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 53 void BenchSysTimer::startWall() { 54 this->fStartWall = mach_absolute_time(); 55 } 56 void BenchSysTimer::startCpu() { 57 this->fStartCpu = macCpuTime(); 58 } 59 60 double BenchSysTimer::endCpu() { 61 time_value_t end_cpu = macCpuTime(); 62 return intervalInMSec(this->fStartCpu, end_cpu); 63 } 64 double 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