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122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Robert O'Callahan <robert@ocallahan.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "mozilla/TimeStamp.h"
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#include "prlock.h"
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namespace mozilla {
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static PRLock* gTimeStampLock;
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static PRUint32 gRolloverCount;
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static PRIntervalTime gLastNow;
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double
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TimeDuration::ToSeconds() const
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{
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return double(mValue)/PR_TicksPerSecond();
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}
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double
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TimeDuration::ToSecondsSigDigits() const
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{
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return ToSeconds();
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}
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TimeDuration
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TimeDuration::FromSeconds(PRInt32 aSeconds)
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{
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// No overflow is possible here
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return TimeDuration::FromTicks(PRInt64(aSeconds)*PR_TicksPerSecond());
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}
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TimeDuration
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TimeDuration::FromMilliseconds(PRInt32 aMilliseconds)
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{
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// No overflow is possible here
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return TimeDuration::FromTicks(PRInt64(aMilliseconds)*PR_TicksPerSecond()/1000);
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}
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TimeDuration
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TimeDuration::Resolution()
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{
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// This is grossly nonrepresentative of actual system capabilities
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// on some platforms
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return TimeDuration::FromTicks(1);
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}
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nsresult
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TimeStamp::Startup()
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{
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gTimeStampLock = PR_NewLock();
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gRolloverCount = 1;
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gLastNow = 0;
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return gTimeStampLock ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
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}
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void
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TimeStamp::Shutdown()
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{
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if (gTimeStampLock) {
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PR_DestroyLock(gTimeStampLock);
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gTimeStampLock = nsnull;
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}
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}
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TimeStamp
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TimeStamp::Now()
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{
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// XXX this could be considerably simpler and faster if we had
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// 64-bit atomic operations
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PR_Lock(gTimeStampLock);
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PRIntervalTime now = PR_IntervalNow();
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if (now < gLastNow) {
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++gRolloverCount;
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// This can't happen unless you've been running for millions of years
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NS_ASSERTION(gRolloverCount > 0, "Rollover in rollover count???");
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}
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gLastNow = now;
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TimeStamp result((PRUint64(gRolloverCount) << 32) + now);
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PR_Unlock(gTimeStampLock);
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return result;
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}
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}
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