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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; \
+ } \
+}