зеркало из https://github.com/mozilla/gecko-dev.git
151 строка
4.5 KiB
C++
151 строка
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Implementation of the OS-independent methods of the TimeStamp class
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*/
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#include "mozilla/Atomics.h"
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#include "mozilla/TimeStamp.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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namespace mozilla {
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/**
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* Wrapper class used to initialize static data used by the TimeStamp class
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*/
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struct TimeStampInitialization {
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/**
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* First timestamp taken when the class static initializers are run. This
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* timestamp is used to sanitize timestamps coming from different sources.
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*/
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TimeStamp mFirstTimeStamp;
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/**
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* Timestamp representing the time when the process was created. This field
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* is populated lazily the first time this information is required and is
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* replaced every time the process is restarted.
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*/
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TimeStamp mProcessCreation;
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TimeStampInitialization() {
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TimeStamp::Startup();
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mFirstTimeStamp = TimeStamp::Now();
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};
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~TimeStampInitialization() { TimeStamp::Shutdown(); };
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};
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static bool sFuzzyfoxEnabled;
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/* static */
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bool TimeStamp::GetFuzzyfoxEnabled() { return sFuzzyfoxEnabled; }
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/* static */
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void TimeStamp::SetFuzzyfoxEnabled(bool aValue) { sFuzzyfoxEnabled = aValue; }
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// These variables store the frozen time (as a TimeStamp) for FuzzyFox that
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// will be reported if FuzzyFox is enabled.
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// We overload the top bit of sCanonicalNow and sCanonicalGTC to
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// indicate if a Timestamp is a fuzzed timestamp (bit set) or not
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// (bit unset).
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#ifdef XP_WIN
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static Atomic<uint64_t> sCanonicalGTC;
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static Atomic<uint64_t> sCanonicalQPC;
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static Atomic<bool> sCanonicalHasQPC;
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#else
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static Atomic<uint64_t> sCanonicalNowTimeStamp;
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#endif
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static Atomic<int64_t> sCanonicalNowTime;
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// This variable stores the frozen time (as ms since the epoch) for FuzzyFox
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// to report if FuzzyFox is enabled.
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static TimeStampInitialization sInitOnce;
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MFBT_API TimeStamp TimeStamp::ProcessCreation(bool* aIsInconsistent) {
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if (aIsInconsistent) {
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*aIsInconsistent = false;
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}
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if (sInitOnce.mProcessCreation.IsNull()) {
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char* mozAppRestart = getenv("MOZ_APP_RESTART");
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TimeStamp ts;
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/* When calling PR_SetEnv() with an empty value the existing variable may
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* be unset or set to the empty string depending on the underlying platform
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* thus we have to check if the variable is present and not empty. */
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if (mozAppRestart && (strcmp(mozAppRestart, "") != 0)) {
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/* Firefox was restarted, use the first time-stamp we've taken as the new
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* process startup time. */
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ts = sInitOnce.mFirstTimeStamp;
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} else {
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TimeStamp now = Now();
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uint64_t uptime = ComputeProcessUptime();
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ts = now - TimeDuration::FromMicroseconds(uptime);
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if ((ts > sInitOnce.mFirstTimeStamp) || (uptime == 0)) {
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/* If the process creation timestamp was inconsistent replace it with
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* the first one instead and notify that a telemetry error was
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* detected. */
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if (aIsInconsistent) {
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*aIsInconsistent = true;
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}
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ts = sInitOnce.mFirstTimeStamp;
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}
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}
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sInitOnce.mProcessCreation = ts;
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}
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return sInitOnce.mProcessCreation;
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}
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void TimeStamp::RecordProcessRestart() {
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sInitOnce.mProcessCreation = TimeStamp();
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}
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MFBT_API TimeStamp TimeStamp::NowFuzzy(TimeStampValue aValue) {
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#ifdef XP_WIN
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TimeStampValue canonicalNow =
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TimeStampValue(sCanonicalGTC, sCanonicalQPC, sCanonicalHasQPC, true);
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#else
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TimeStampValue canonicalNow = TimeStampValue(sCanonicalNowTimeStamp);
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#endif
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if (TimeStamp::GetFuzzyfoxEnabled()) {
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if (MOZ_LIKELY(!canonicalNow.IsNull())) {
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return TimeStamp(canonicalNow);
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}
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}
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// When we disable Fuzzyfox, time may goes backwards, so we need to make sure
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// we don't do that.
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else if (MOZ_UNLIKELY(canonicalNow > aValue)) {
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return TimeStamp(canonicalNow);
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}
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return TimeStamp(aValue);
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}
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MFBT_API void TimeStamp::UpdateFuzzyTimeStamp(TimeStamp aValue) {
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#ifdef XP_WIN
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sCanonicalGTC = aValue.mValue.mGTC;
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sCanonicalQPC = aValue.mValue.mQPC;
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sCanonicalHasQPC = aValue.mValue.mHasQPC;
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#else
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sCanonicalNowTimeStamp = aValue.mValue.mTimeStamp;
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#endif
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}
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MFBT_API int64_t TimeStamp::NowFuzzyTime() { return sCanonicalNowTime; }
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MFBT_API void TimeStamp::UpdateFuzzyTime(int64_t aValue) {
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sCanonicalNowTime = aValue;
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}
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} // namespace mozilla
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