gecko/xpcom/ds/TimeStamp.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "prenv.h"
namespace mozilla {
TimeStamp TimeStamp::sFirstTimeStamp;
TimeStamp TimeStamp::sProcessCreation;
TimeStamp
TimeStamp::ProcessCreation(bool& aIsInconsistent)
{
aIsInconsistent = false;
if (sProcessCreation.IsNull()) {
char *mozAppRestart = PR_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 = sFirstTimeStamp;
} else {
TimeStamp now = Now();
uint64_t uptime = ComputeProcessUptime();
ts = now - TimeDuration::FromMicroseconds(uptime);
if ((ts > sFirstTimeStamp) || (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 = sFirstTimeStamp;
}
}
sProcessCreation = ts;
}
return sProcessCreation;
}
void
TimeStamp::RecordProcessRestart()
{
sProcessCreation = TimeStamp();
}
} // namespace mozilla