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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SysTimer_mach.h"
static time_value_t mac_cpu_time() {
mach_port_t task = mach_task_self();
if (task == MACH_PORT_NULL) {
time_value_t none = {0, 0};
return none;
}
task_thread_times_info thread_info_data;
mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT;
if (KERN_SUCCESS != task_info(task,
TASK_THREAD_TIMES_INFO,
reinterpret_cast<task_info_t>(&thread_info_data),
&thread_info_count)) {
time_value_t none = {0, 0};
return none;
}
time_value_add(&thread_info_data.user_time, &thread_info_data.system_time)
return thread_info_data.user_time;
}
static double interval_in_ms(time_value_t start_clock, time_value_t end_clock) {
double duration_clock;
if ((end_clock.microseconds - start_clock.microseconds) < 0) {
duration_clock = (end_clock.seconds - start_clock.seconds-1) * 1000;
duration_clock += (1000000 + end_clock.microseconds - start_clock.microseconds) / 1000.0;
} else {
duration_clock = (end_clock.seconds - start_clock.seconds) * 1000;
duration_clock += (end_clock.microseconds - start_clock.microseconds) / 1000.0;
}
return duration_clock;
}
void SysTimer::startWall() {
fStartWall = mach_absolute_time();
}
void SysTimer::startCpu() {
fStartCpu = mac_cpu_time();
}
double SysTimer::endCpu() {
time_value_t end_cpu = mac_cpu_time();
return interval_in_ms(fStartCpu, end_cpu);
}
double SysTimer::endWall() {
uint64_t end_wall = mach_absolute_time();
uint64_t elapsed = end_wall - fStartWall;
mach_timebase_info_data_t sTimebaseInfo;
if (KERN_SUCCESS != mach_timebase_info(&sTimebaseInfo)) {
return 0;
} else {
uint64_t elapsedNano = elapsed * sTimebaseInfo.numer / sTimebaseInfo.denom;
return elapsedNano / 1000000.0;
}
}
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