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 } 67
