WebCore/platform/win/SystemTimeWin.cpp

/*
 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "SystemTime.h"

#include <JavaScriptCore/DateMath.h>
#include <windows.h>

namespace WebCore {

double currentTime()
{
    // Call through to our high-resolution JSC time code, since calls like GetSystemTimeAsFileTime and ftime are only accurate within 15ms.
    // This resolution can be improved with timeBeginPeriod/timeEndPeriod on Vista, but these calls don't
    // improve the resolution of date/time getters (GetSystemTimeAsFileTime, ftime, etc.) on XP.
    return KJS::getCurrentUTCTime() * 0.001;
}

float userIdleTime()
{
    LASTINPUTINFO lastInputInfo = {0};
    lastInputInfo.cbSize = sizeof(LASTINPUTINFO);
    if (::GetLastInputInfo(&lastInputInfo))
        return (GetTickCount() - lastInputInfo.dwTime) * 0.001; // ::GetTickCount returns ms of uptime valid for up to 49.7 days.
    return FLT_MAX; // return an arbitrarily high userIdleTime so that releasing pages from the page cache isn't postponed. 
}

}