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| 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 / 1000000.0; |
| 75 } |
| 76 } |
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