1 #include "BenchSysTimer_mach.h" 2 3 //Time 4 #include <mach/mach.h> 5 #include <mach/mach_time.h> 6 7 static time_value_t macCpuTime() { 8 mach_port_t task = mach_task_self(); 9 if (task == MACH_PORT_NULL) { 10 time_value_t none = {0, 0}; 11 return none; 12 } 13 14 task_thread_times_info thread_info_data; 15 mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT; 16 if (KERN_SUCCESS != task_info(task, 17 TASK_THREAD_TIMES_INFO, 18 reinterpret_cast<task_info_t>(&thread_info_data), 19 &thread_info_count)) 20 { 21 time_value_t none = {0, 0}; 22 return none; 23 } 24 25 time_value_add(&thread_info_data.user_time, &thread_info_data.system_time) 26 return thread_info_data.user_time; 27 } 28 29 static double intervalInMSec(const time_value_t start_clock 30 , const time_value_t end_clock) 31 { 32 double duration_clock; 33 if ((end_clock.microseconds - start_clock.microseconds) < 0) { 34 duration_clock = (end_clock.seconds - start_clock.seconds-1)*1000; 35 duration_clock += (1000000 36 + end_clock.microseconds 37 - start_clock.microseconds) / 1000.0; 38 } else { 39 duration_clock = (end_clock.seconds - start_clock.seconds)*1000; 40 duration_clock += (end_clock.microseconds - start_clock.microseconds) 41 / 1000.0; 42 } 43 return duration_clock; 44 } 45 46 void BenchSysTimer::startWall() { 47 this->fStartWall = mach_absolute_time(); 48 } 49 void BenchSysTimer::startCpu() { 50 this->fStartCpu = macCpuTime(); 51 } 52 53 double BenchSysTimer::endCpu() { 54 time_value_t end_cpu = macCpuTime(); 55 return intervalInMSec(this->fStartCpu, end_cpu); 56 } 57 double BenchSysTimer::endWall() { 58 uint64_t end_wall = mach_absolute_time(); 59 60 uint64_t elapsed = end_wall - this->fStartWall; 61 mach_timebase_info_data_t sTimebaseInfo; 62 if (KERN_SUCCESS != mach_timebase_info(&sTimebaseInfo)) { 63 return 0; 64 } else { 65 uint64_t elapsedNano = elapsed * sTimebaseInfo.numer 66 / sTimebaseInfo.denom; 67 return elapsedNano / 1000000; 68 } 69 } 70
