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 AwakeTimeStamp::operator-(
  35     AwakeTimeStamp const& aOther) const {
  36   return AwakeTimeDuration(mValueUs - aOther.mValueUs);
  37 }
  38
  39 AwakeTimeStamp AwakeTimeStamp::operator+(
  40     const AwakeTimeDuration& aDuration) const {
  41   return AwakeTimeStamp(mValueUs + aDuration.mValueUs);
  42 }
  43
  44 void AwakeTimeStamp::operator+=(const AwakeTimeDuration& aOther) {
  45   mValueUs += aOther.mValueUs;
  46 }
  47
  48 void AwakeTimeStamp::operator-=(const AwakeTimeDuration& aOther) {
  49   MOZ_ASSERT(mValueUs >= aOther.mValueUs);
  50   mValueUs -= aOther.mValueUs;
  51 }
  52
  53 // Apple things
  54 #if defined(__APPLE__) && defined(__MACH__)
  55 #  include <time.h>
  56 #  include <sys/time.h>
  57 #  include <sys/types.h>
  58 #  include <mach/mach_time.h>
  59
  60 AwakeTimeStamp AwakeTimeStamp::NowLoRes() {
  61   return AwakeTimeStamp(clock_gettime_nsec_np(CLOCK_UPTIME_RAW) / kNSperUS);
  62 }
  63
  64 #elif defined(XP_WIN)
  65
  66 // Number of hundreds of nanoseconds in a microsecond
  67 static constexpr uint64_t kHNSperUS = 10;
  68
  69 AwakeTimeStamp AwakeTimeStamp::NowLoRes() {
  70   ULONGLONG interrupt_time;
  71   DebugOnly<bool> rv = QueryUnbiasedInterruptTime(&interrupt_time);
  72   MOZ_ASSERT(rv);
  73
  74   return AwakeTimeStamp(interrupt_time / kHNSperUS);
  75 }
  76
  77 #else  // Linux and other POSIX but not macOS
  78 #  include <time.h>
  79
  80 uint64_t TimespecToMicroseconds(struct timespec aTs) {
  81   return aTs.tv_sec * kUSperS + aTs.tv_nsec / kNSperUS;
  82 }
  83
  84 AwakeTimeStamp AwakeTimeStamp::NowLoRes() {
  85   struct timespec ts = {0};
  86   DebugOnly<int> rv = clock_gettime(CLOCK_MONOTONIC, &ts);
  87   MOZ_ASSERT(!rv);
  88   return AwakeTimeStamp(TimespecToMicroseconds(ts));
  89 }
  90
  91 #endif
  92
  93 };  // namespace mozilla