SkTime::GetNSecs()

tools/timer/SysTimer_mach.cpp

-/*
- * 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;
-    }
-}