usr/sample/alarm/alarm.c

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This source file includes following definitions.
alarm_handler
main
   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 <sys/prex.h>
  54 #include <sys/signal.h>
  55 #include <stdio.h>
  56 
  57 static int hz;
  58 static volatile u_long 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=%ld 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 timerinfo info;
  87         int code;
  88 
  89         printf("Alarm sample program\n");
  90 
  91         sys_info(INFO_TIMER, &info);
  92         if (info.hz == 0)
  93                 panic("can not get timer tick rate");
  94         hz = info.hz;
  95 
  96         /*
  97          * Install alarm handler
  98          */
  99         exception_setup(alarm_handler);
 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         while (count < 10) {
 112                 exception_wait(&code);
 113         }
 114         printf("Test completed...\n");
 115         return 0;
 116 }
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root/usr/sample/alarm/alarm.c

DEFINITIONS
