Annotation of prex/usr/sample/alarm/alarm.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005-2007, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: /*
! 31: * alarm.c - sample alarm program.
! 32: */
! 33:
! 34: /*
! 35: * Expected output:
! 36: *
! 37: * Alarm sample program
! 38: * Start alarm timer
! 39: * Ring! count=1 time=1000 msec
! 40: * Ring! count=2 time=1200 msec
! 41: * Ring! count=3 time=1600 msec
! 42: * Ring! count=4 time=2200 msec
! 43: * Ring! count=5 time=3000 msec
! 44: * Ring! count=6 time=4000 msec
! 45: * Ring! count=7 time=5200 msec
! 46: * Ring! count=8 time=6600 msec
! 47: * Ring! count=9 time=8200 msec
! 48: * Ring! count=10 time=10000 msec
! 49: * End...
! 50: *
! 51: */
! 52:
! 53: #include <prex/prex.h>
! 54: #include <sys/signal.h>
! 55: #include <stdio.h>
! 56:
! 57: static int hz;
! 58: static int count;
! 59: static u_long start_tick;
! 60:
! 61: /*
! 62: * Re-program alarm timer as count * 200msec.
! 63: */
! 64: static void
! 65: alarm_handler(int code)
! 66: {
! 67: u_long tick;
! 68:
! 69: if (code == SIGALRM) {
! 70: count++;
! 71: if (count > 10) {
! 72: printf("End...\n");
! 73: task_terminate(task_self());
! 74: }
! 75: timer_alarm(count * 200, 0);
! 76: sys_time(&tick);
! 77: printf("Ring! count=%d time=%d msec\n", count,
! 78: (u_int)((tick - start_tick) * 1000 / hz));
! 79: }
! 80: exception_return();
! 81: }
! 82:
! 83: int
! 84: main(int argc, char *argv[])
! 85: {
! 86: struct info_timer info;
! 87:
! 88: printf("Alarm sample program\n");
! 89:
! 90: sys_info(INFO_TIMER, &info);
! 91: if (info.hz == 0)
! 92: panic("can not get timer tick rate");
! 93: hz = info.hz;
! 94:
! 95: /*
! 96: * Install alarm handler
! 97: */
! 98: exception_setup(alarm_handler);
! 99: exception_raise(task_self(), 0xfff);
! 100: timer_sleep(2000, 0);
! 101:
! 102: /*
! 103: * Kick first alarm timer.
! 104: */
! 105: printf("Start alarm timer\n");
! 106: count = 0;
! 107: sys_time(&start_tick);
! 108: timer_alarm(1000, 0);
! 109:
! 110: /* Wait alarm */
! 111: for (;;);
! 112:
! 113: return 0;
! 114: }
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