mozglue/misc/AwakeTimeStamp.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "AwakeTimeStamp.h"
   8
   9 #ifdef XP_WIN
  10 #  include <windows.h>
  11 #endif
  12
  13 #include "mozilla/Assertions.h"
  14 #include "mozilla/DebugOnly.h"
  15
  16 namespace mozilla {
  17
  18 static constexpr uint64_t kUSperS = 1000000;
  19 static constexpr uint64_t kUSperMS = 1000;
  20 #ifndef XP_WIN
  21 static constexpr uint64_t kNSperUS = 1000;
  22 #endif
  23
  24 double AwakeTimeDuration::ToSeconds() const {
  25   return static_cast<double>(mValueUs) / kUSperS;
  26 }
  27 double AwakeTimeDuration::ToMilliseconds() const {
  28   return static_cast<double>(mValueUs) / kUSperMS;
  29 }
  30 double AwakeTimeDuration::ToMicroseconds() const {
  31   return static_cast<double>(mValueUs);
  32 }
  33
  34 AwakeTimeDuration AwakeTimeDuration::FromSeconds(uint64_t aSeconds) {
  35   return AwakeTimeDuration(aSeconds * 1000000);
  36 }
  37 AwakeTimeDuration AwakeTimeDuration::FromMilliseconds(uint64_t aMilliseconds) {
  38   return AwakeTimeDuration(aMilliseconds * 1000);
  39 }
  40 AwakeTimeDuration AwakeTimeDuration::FromMicroseconds(uint64_t aMicroseconds) {
  41   return AwakeTimeDuration(aMicroseconds);
  42 }
  43
  44 AwakeTimeDuration AwakeTimeStamp::operator-(
  45     AwakeTimeStamp const& aOther) const {
  46   return AwakeTimeDuration(mValueUs - aOther.mValueUs);
  47 }
  48
  49 AwakeTimeStamp AwakeTimeStamp::operator-(
  50     AwakeTimeDuration const& aOther) const {
  51   return AwakeTimeStamp(mValueUs - aOther.mValueUs);
  52 }
  53
  54 AwakeTimeStamp AwakeTimeStamp::operator+(
  55     const AwakeTimeDuration& aDuration) const {
  56   return AwakeTimeStamp(mValueUs + aDuration.mValueUs);
  57 }
  58
  59 void AwakeTimeStamp::operator+=(const AwakeTimeDuration& aOther) {
  60   mValueUs += aOther.mValueUs;
  61 }
  62
  63 void AwakeTimeStamp::operator-=(const AwakeTimeDuration& aOther) {
  64   MOZ_ASSERT(mValueUs >= aOther.mValueUs);
  65   mValueUs -= aOther.mValueUs;
  66 }
  67
  68 // Apple things
  69 #if defined(__APPLE__) && defined(__MACH__)
  70 #  include <time.h>
  71 #  include <sys/time.h>
  72 #  include <sys/types.h>
  73 #  include <mach/mach_time.h>
  74
  75 AwakeTimeStamp AwakeTimeStamp::Now() {
  76   return AwakeTimeStamp(clock_gettime_nsec_np(CLOCK_UPTIME_RAW) / kNSperUS);
  77 }
  78
  79 AwakeTimeStamp AwakeTimeStamp::NowLoRes() { return Now(); }
  80
  81 #elif defined(XP_WIN)
  82
  83 // Number of hundreds of nanoseconds in a microsecond
  84 static constexpr uint64_t kHNSperUS = 10;
  85
  86 AwakeTimeStamp AwakeTimeStamp::NowLoRes() {
  87   ULONGLONG interrupt_time;
  88   DebugOnly<bool> rv = QueryUnbiasedInterruptTime(&interrupt_time);
  89   MOZ_ASSERT(rv);
  90
  91   return AwakeTimeStamp(interrupt_time / kHNSperUS);
  92 }
  93
  94 AwakeTimeStamp AwakeTimeStamp::Now() {
  95   ULONGLONG interrupt_time;
  96   QueryUnbiasedInterruptTimePrecise(&interrupt_time);
  97
  98   return AwakeTimeStamp(interrupt_time / kHNSperUS);
  99 }
 100
 101 #else  // Linux and other POSIX but not macOS
 102 #  include <time.h>
 103
 104 uint64_t TimespecToMicroseconds(struct timespec aTs) {
 105   return aTs.tv_sec * kUSperS + aTs.tv_nsec / kNSperUS;
 106 }
 107
 108 AwakeTimeStamp AwakeTimeStamp::Now() {
 109   struct timespec ts = {0};
 110   DebugOnly<int> rv = clock_gettime(CLOCK_MONOTONIC, &ts);
 111   MOZ_ASSERT(!rv);
 112   return AwakeTimeStamp(TimespecToMicroseconds(ts));
 113 }
 114
 115 AwakeTimeStamp AwakeTimeStamp::NowLoRes() { return Now(); }
 116
 117 #endif
 118
 119 };  // namespace mozilla