1 /****************************************************************************
3 * SciTech OS Portability Manager Library
5 * ========================================================================
7 * The contents of this file are subject to the SciTech MGL Public
8 * License Version 1.0 (the "License"); you may not use this file
9 * except in compliance with the License. You may obtain a copy of
10 * the License at http://www.scitechsoft.com/mgl-license.txt
12 * Software distributed under the License is distributed on an
13 * "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
14 * implied. See the License for the specific language governing
15 * rights and limitations under the License.
17 * The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
19 * The Initial Developer of the Original Code is SciTech Software, Inc.
20 * All Rights Reserved.
22 * ========================================================================
27 * Description: Test program to check the ability to install a C based
28 * timer interrupt handler.
30 * Functions tested: PM_setTimerHandler()
31 * PM_chainPrevTimer();
32 * PM_restoreTimerHandler()
34 ****************************************************************************/
40 volatile long count = 0;
42 #pragma off (check_stack) /* No stack checking under Watcom */
44 void PMAPI timerHandler(void)
46 PM_chainPrevTimer(); /* Chain to previous handler */
55 printf("Program running in ");
56 switch (PM_getModeType()) {
58 printf("real mode.\n\n");
61 printf("16 bit protected mode.\n\n");
64 printf("32 bit protected mode.\n\n");
68 /* Install our timer handler and lock handler pages in memory. It is
69 * difficult to get the size of a function in C, but we know our
70 * function is well less than 100 bytes (and an entire 4k page will
71 * need to be locked by the server anyway).
73 PM_lockCodePages((__codePtr)timerHandler,100,&lh);
74 PM_lockDataPages((void*)&count,sizeof(count),&lh);
75 PM_installBreakHandler(); /* We *DONT* want Ctrl-Breaks! */
76 PM_setTimerHandler(timerHandler);
77 printf("Timer interrupt handler installed - Hit ESC to exit\n");
80 if (PM_kbhit() && (PM_getch() == 0x1B))
82 if (count != oldCount) {
83 printf("Tick, Tock: %ld\n", count);
88 PM_restoreTimerHandler();
89 PM_restoreBreakHandler();
90 PM_unlockDataPages((void*)&count,sizeof(count),&lh);
91 PM_unlockCodePages((__codePtr)timerHandler,100,&lh);
92 printf("Timer handler was called %ld times\n", count);