base/profiler/tracked_time.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/profiler/tracked_time.h"
   6
   7 #include "build/build_config.h"
   8
   9 #if defined(OS_WIN)
  10 #include <mmsystem.h>  // Declare timeGetTime()... after including build_config.
  11 #endif
  12
  13 namespace tracked_objects {
  14
  15 Duration::Duration() : ms_(0) {}
  16 Duration::Duration(int32 duration) : ms_(duration) {}
  17
  18 Duration& Duration::operator+=(const Duration& other) {
  19   ms_ += other.ms_;
  20   return *this;
  21 }
  22
  23 Duration Duration::operator+(const Duration& other) const {
  24   return Duration(ms_ + other.ms_);
  25 }
  26
  27 bool Duration::operator==(const Duration& other) const {
  28   return ms_ == other.ms_;
  29 }
  30
  31 bool Duration::operator!=(const Duration& other) const {
  32   return ms_ != other.ms_;
  33 }
  34
  35 bool Duration::operator>(const Duration& other) const {
  36   return ms_ > other.ms_;
  37 }
  38
  39 // static
  40 Duration Duration::FromMilliseconds(int ms) { return Duration(ms); }
  41
  42 int32 Duration::InMilliseconds() const { return ms_; }
  43
  44 //------------------------------------------------------------------------------
  45
  46 TrackedTime::TrackedTime() : ms_(0) {}
  47 TrackedTime::TrackedTime(int32 ms) : ms_(ms) {}
  48 TrackedTime::TrackedTime(const base::TimeTicks& time)
  49     : ms_((time - base::TimeTicks()).InMilliseconds()) {
  50 }
  51
  52 // static
  53 TrackedTime TrackedTime::Now() {
  54 #if defined(OS_WIN)
  55   // Use lock-free accessor to 32 bit time.
  56   // Note that TimeTicks::Now() is built on this, so we have "compatible"
  57   // times when we down-convert a TimeTicks sample.
  58   // TODO(jar): Surface this interface via something in base/time.h.
  59   return TrackedTime(static_cast<int32>(timeGetTime()));
  60 #else
  61   // Posix has nice cheap 64 bit times, so we just down-convert it.
  62   return TrackedTime(base::TimeTicks::Now());
  63 #endif  // OS_WIN
  64 }
  65
  66 Duration TrackedTime::operator-(const TrackedTime& other) const {
  67   return Duration(ms_ - other.ms_);
  68 }
  69
  70 TrackedTime TrackedTime::operator+(const Duration& other) const {
  71   return TrackedTime(ms_ + other.ms_);
  72 }
  73
  74 bool TrackedTime::is_null() const { return ms_ == 0; }
  75
  76 }  // namespace tracked_objects