| /* -*- 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 |
| */ |
| |
| #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 |
| * timestamp is used to sanitize timestamps coming from different sources. |
| */ |
| TimeStamp mFirstTimeStamp; |
| |
| /** |
| * Timestamp representing the time when the process was created. This field |
| * is populated lazily the first time this information is required and is |
| * replaced every time the process is restarted. |
| */ |
| TimeStamp mProcessCreation; |
| |
| TimeStampInitialization() |
| { |
| TimeStamp::Startup(); |
| mFirstTimeStamp = TimeStamp::Now(); |
| }; |
| |
| ~TimeStampInitialization() |
| { |
| TimeStamp::Shutdown(); |
| }; |
| }; |
| |
| static TimeStampInitialization sInitOnce; |
| |
| MFBT_API TimeStamp |
| TimeStamp::ProcessCreation(bool& aIsInconsistent) |
| { |
| aIsInconsistent = false; |
| |
| if (sInitOnce.mProcessCreation.IsNull()) { |
| char* mozAppRestart = js_sb_getenv("MOZ_APP_RESTART"); |
| TimeStamp ts; |
| |
| /* When calling PR_SetEnv() with an empty value the existing variable may |
| * be unset or set to the empty string depending on the underlying platform |
| * 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 |
| * process startup time. */ |
| ts = sInitOnce.mFirstTimeStamp; |
| } else { |
| TimeStamp now = Now(); |
| 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 |
| * the first one instead and notify that a telemetry error was |
| * detected. */ |
| aIsInconsistent = true; |
| ts = sInitOnce.mFirstTimeStamp; |
| } |
| } |
| |
| sInitOnce.mProcessCreation = ts; |
| } |
| |
| return sInitOnce.mProcessCreation; |
| } |
| |
| void |
| TimeStamp::RecordProcessRestart() |
| { |
| sInitOnce.mProcessCreation = TimeStamp(); |
| } |
| |
| } // namespace mozilla |