зеркало из https://github.com/mozilla/gecko-dev.git
132 строки
3.7 KiB
C++
132 строки
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim:set ts=2 sw=2 sts=2 et cindent: */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is Mozilla code.
|
|
*
|
|
* The Initial Developer of the Original Code is the Mozilla Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 2009
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Robert O'Callahan <robert@ocallahan.org>
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#include "mozilla/TimeStamp.h"
|
|
#include "prlock.h"
|
|
|
|
namespace mozilla {
|
|
|
|
struct TimeStampInitialization
|
|
{
|
|
TimeStampInitialization() {
|
|
TimeStamp::Startup();
|
|
}
|
|
~TimeStampInitialization() {
|
|
TimeStamp::Shutdown();
|
|
}
|
|
};
|
|
|
|
static TimeStampInitialization initOnce;
|
|
|
|
static PRLock* gTimeStampLock = 0;
|
|
static PRUint32 gRolloverCount;
|
|
static PRIntervalTime gLastNow;
|
|
|
|
double
|
|
TimeDuration::ToSeconds() const
|
|
{
|
|
return double(mValue)/PR_TicksPerSecond();
|
|
}
|
|
|
|
double
|
|
TimeDuration::ToSecondsSigDigits() const
|
|
{
|
|
return ToSeconds();
|
|
}
|
|
|
|
TimeDuration
|
|
TimeDuration::FromMilliseconds(double aMilliseconds)
|
|
{
|
|
static double kTicksPerMs = double(PR_TicksPerSecond()) / 1000.0;
|
|
return TimeDuration::FromTicks(aMilliseconds * kTicksPerMs);
|
|
}
|
|
|
|
TimeDuration
|
|
TimeDuration::Resolution()
|
|
{
|
|
// This is grossly nonrepresentative of actual system capabilities
|
|
// on some platforms
|
|
return TimeDuration::FromTicks(PRInt64(1));
|
|
}
|
|
|
|
nsresult
|
|
TimeStamp::Startup()
|
|
{
|
|
if (gTimeStampLock)
|
|
return NS_OK;
|
|
|
|
// TimeStamp has to use bare PRLock instead of mozilla::Mutex
|
|
// because TimeStamp can be used very early in startup.
|
|
gTimeStampLock = PR_NewLock();
|
|
gRolloverCount = 1;
|
|
gLastNow = 0;
|
|
return gTimeStampLock ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
void
|
|
TimeStamp::Shutdown()
|
|
{
|
|
if (gTimeStampLock) {
|
|
PR_DestroyLock(gTimeStampLock);
|
|
gTimeStampLock = nsnull;
|
|
}
|
|
}
|
|
|
|
TimeStamp
|
|
TimeStamp::Now()
|
|
{
|
|
// XXX this could be considerably simpler and faster if we had
|
|
// 64-bit atomic operations
|
|
PR_Lock(gTimeStampLock);
|
|
|
|
PRIntervalTime now = PR_IntervalNow();
|
|
if (now < gLastNow) {
|
|
++gRolloverCount;
|
|
// This can't happen unless you've been running for millions of years
|
|
NS_ASSERTION(gRolloverCount > 0, "Rollover in rollover count???");
|
|
}
|
|
|
|
gLastNow = now;
|
|
TimeStamp result((PRUint64(gRolloverCount) << 32) + now);
|
|
|
|
PR_Unlock(gTimeStampLock);
|
|
return result;
|
|
}
|
|
|
|
}
|