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      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