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/****************************************************************************
*
* SciTech OS Portability Manager Library
*
* ========================================================================
*
* 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: any
*
* Description: Test program to check the ability to install a C based
* timer interrupt handler.
*
* Functions tested: PM_setTimerHandler()
* PM_chainPrevTimer();
* PM_restoreTimerHandler()
*
****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include "pmapi.h"
volatile long count = 0;
#pragma off (check_stack) /* No stack checking under Watcom */
void PMAPI timerHandler(void)
{
PM_chainPrevTimer(); /* Chain to previous handler */
count++;
}
int main(void)
{
long oldCount;
PM_lockHandle lh;
printf("Program running in ");
switch (PM_getModeType()) {
case PM_realMode:
printf("real mode.\n\n");
break;
case PM_286:
printf("16 bit protected mode.\n\n");
break;
case PM_386:
printf("32 bit protected mode.\n\n");
break;
}
/* Install our timer handler and lock handler pages in memory. It is
* difficult to get the size of a function in C, but we know our
* function is well less than 100 bytes (and an entire 4k page will
* need to be locked by the server anyway).
*/
PM_lockCodePages((__codePtr)timerHandler,100,&lh);
PM_lockDataPages((void*)&count,sizeof(count),&lh);
PM_installBreakHandler(); /* We *DONT* want Ctrl-Breaks! */
PM_setTimerHandler(timerHandler);
printf("Timer interrupt handler installed - Hit ESC to exit\n");
oldCount = count;
while (1) {
if (PM_kbhit() && (PM_getch() == 0x1B))
break;
if (count != oldCount) {
printf("Tick, Tock: %ld\n", count);
oldCount = count;
}
}
PM_restoreTimerHandler();
PM_restoreBreakHandler();
PM_unlockDataPages((void*)&count,sizeof(count),&lh);
PM_unlockCodePages((__codePtr)timerHandler,100,&lh);
printf("Timer handler was called %ld times\n", count);
return 0;
}
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