+
−/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
−/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+
−/* This Source Code Form is subject to the terms of the Mozilla Public
+
− * License, v. 2.0. If a copy of the MPL was not distributed with this
+
− * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
−
+
−/*
+
− * Implementation of the OS-independent methods of the TimeStamp class
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− */
+
−
+
−#include "mozilla/TimeStamp.h"
+
−#include <stdio.h>
+
−#include <string.h>
+
−
+
−namespace mozilla {
+
−
+
−/**
+
− * Wrapper class used to initialize static data used by the TimeStamp class
+
− */
+
−struct TimeStampInitialization
+
−{
+
−  /**
+
−   * 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.
+
−   */
+
−  TimeStamp mFirstTimeStamp;
+
−
+
−  /**
+
−   * 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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−  TimeStamp mProcessCreation;
+
−
+
−  TimeStampInitialization()
+
−  {
+
−    TimeStamp::Startup();
+
−    mFirstTimeStamp = TimeStamp::Now();
+
−  };
+
−
+
−  ~TimeStampInitialization()
+
−  {
+
−    TimeStamp::Shutdown();
+
−  };
+
−};
+
−
+
−static TimeStampInitialization sInitOnce;
+
−
+
−MFBT_API TimeStamp
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−TimeStamp::ProcessCreation(bool* aIsInconsistent)
+
−{
+
−  if (aIsInconsistent) {
+
−    *aIsInconsistent = false;
+
−  }
+
−
+
−  if (sInitOnce.mProcessCreation.IsNull()) {
+
−    char* mozAppRestart = getenv("MOZ_APP_RESTART");
+
−    TimeStamp ts;
+
−
+
−    /* 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. */
+
−    if (mozAppRestart && (strcmp(mozAppRestart, "") != 0)) {
+
−      /* Firefox was restarted, use the first time-stamp we've taken as the new
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−       * process startup time. */
+
−      ts = sInitOnce.mFirstTimeStamp;
+
−    } else {
+
−      TimeStamp now = Now();
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−      uint64_t uptime = ComputeProcessUptime();
+
−
+
−      ts = now - TimeDuration::FromMicroseconds(uptime);
+
−
+
−      if ((ts > sInitOnce.mFirstTimeStamp) || (uptime == 0)) {
+
−        /* 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. */
+
−        if (aIsInconsistent) {
+
−          *aIsInconsistent = true;
+
−        }
+
−        ts = sInitOnce.mFirstTimeStamp;
+
−      }
+
−    }
+
−
+
−    sInitOnce.mProcessCreation = ts;
+
−  }
+
−
+
−  return sInitOnce.mProcessCreation;
+
−}
+
−
+
−void
+
−TimeStamp::RecordProcessRestart()
+
−{
+
−  sInitOnce.mProcessCreation = TimeStamp();
+
−}
+
−
+
−} // namespace mozilla