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/****************************************************************************
*
* Ultra Long Period Timer
*
* ========================================================================
*
* The contents of this file are subject to the SciTech MGL Public
* License Version 1.0 (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.scitechsoft.com/mgl-license.txt
*
* 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 Copyright (C) 1991-1998 SciTech Software, Inc.
*
* The Initial Developer of the Original Code is SciTech Software, Inc.
* All Rights Reserved.
*
* ========================================================================
*
* Language: ANSI C
* Environment: Win32
*
* Description: Module to implement OS specific services to measure the
* CPU frequency.
*
****************************************************************************/
/*---------------------------- Global variables ---------------------------*/
static ibool havePerformanceCounter;
/*----------------------------- Implementation ----------------------------*/
/****************************************************************************
REMARKS:
Increase the thread priority to maximum, if possible.
****************************************************************************/
static int SetMaxThreadPriority(void)
{
int oldPriority;
HANDLE hThread = GetCurrentThread();
oldPriority = GetThreadPriority(hThread);
if (oldPriority != THREAD_PRIORITY_ERROR_RETURN)
SetThreadPriority(hThread, THREAD_PRIORITY_TIME_CRITICAL);
return oldPriority;
}
/****************************************************************************
REMARKS:
Restore the original thread priority.
****************************************************************************/
static void RestoreThreadPriority(
int oldPriority)
{
HANDLE hThread = GetCurrentThread();
if (oldPriority != THREAD_PRIORITY_ERROR_RETURN)
SetThreadPriority(hThread, oldPriority);
}
/****************************************************************************
REMARKS:
Initialise the counter and return the frequency of the counter.
****************************************************************************/
static void GetCounterFrequency(
CPU_largeInteger *freq)
{
if (!QueryPerformanceFrequency((LARGE_INTEGER*)freq)) {
havePerformanceCounter = false;
freq->low = 100000;
freq->high = 0;
}
else
havePerformanceCounter = true;
}
/****************************************************************************
REMARKS:
Read the counter and return the counter value.
****************************************************************************/
#define GetCounter(t) \
{ \
if (havePerformanceCounter) \
QueryPerformanceCounter((LARGE_INTEGER*)t); \
else { \
(t)->low = timeGetTime() * 100; \
(t)->high = 0; \
} \
}
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