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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/*
* NT interval timers
*
*/
#include "primpl.h"
#if defined(WIN16)
#include <win/compobj.h>
#define QueryPerformanceFrequency(x) FALSE
#define QueryPerformanceCounter(x) FALSE
#endif
PRIntn _nt_bitShift = 0;
PRInt32 _nt_highMask = 0;
PRInt32 _nt_ticksPerSec = -1;
void
_PR_MD_INTERVAL_INIT()
{
LARGE_INTEGER count;
if (QueryPerformanceFrequency(&count)) {
while(count.LowPart > PR_INTERVAL_MAX) {
count.LowPart >>= 1;
_nt_bitShift++;
_nt_highMask = (_nt_highMask << 1)+1;
}
_nt_ticksPerSec = count.LowPart;
PR_ASSERT(_nt_ticksPerSec > PR_INTERVAL_MIN);
} else
_nt_ticksPerSec = -1;
}
PRIntervalTime
_PR_MD_GET_INTERVAL()
{
LARGE_INTEGER count;
/* Sadly; nspr requires the interval to range from 1000 ticks per second
* to only 100000 ticks per second; QueryPerformanceCounter is too high
* resolution...
*/
if (QueryPerformanceCounter(&count)) {
PRInt32 top = count.HighPart & _nt_highMask;
top = top << (32 - _nt_bitShift);
count.LowPart = count.LowPart >> _nt_bitShift;
count.LowPart = count.LowPart + top;
return (PRUint32)count.LowPart;
} else
#if defined(__MINGW32__)
return time();
#elif defined(WIN16)
return clock(); /* milliseconds since application start */
#else
return GetTickCount(); /* milliseconds since system start */
#endif
}
PRIntervalTime
_PR_MD_INTERVAL_PER_SEC()
{
if (_nt_ticksPerSec != -1)
return _nt_ticksPerSec;
else
return 1000;
}
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