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79 lines
2.3 KiB
C++
79 lines
2.3 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/TimeStamp.h"
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#include "mozilla/Uptime.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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TimeStamp now = TimeStamp::Now();
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TimeStamp process_creation;
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char* mozAppRestart = getenv("MOZ_APP_RESTART");
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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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process_creation = now;
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} else {
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uint64_t uptime = TimeStamp::ComputeProcessUptime();
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process_creation =
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now - TimeDuration::FromMicroseconds(static_cast<double>(uptime));
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if ((process_creation > now) || (uptime == 0)) {
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process_creation = now;
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}
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}
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mFirstTimeStamp = now;
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mProcessCreation = process_creation;
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// On Windows < 10, initializing the uptime requires `mFirstTimeStamp` to be
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// valid.
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mozilla::InitializeUptime();
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};
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~TimeStampInitialization() { TimeStamp::Shutdown(); };
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};
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static TimeStampInitialization sInitOnce;
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MFBT_API TimeStamp TimeStamp::ProcessCreation() {
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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::Now();
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}
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} // namespace mozilla
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