Return to alarm.c CVS log

Up to [local] / prex-old / usr / sample / alarm

Annotation of prex-old/usr/sample/alarm/alarm.c, Revision 1.1.1.1.2.1

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
1.1.1.1.2.1! nbrk       65: alarm_handler(int code)
1.1       nbrk       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:        }
1.1.1.1.2.1! nbrk       80:        exception_return();
1.1       nbrk       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: }