scoutos / prex-0.9.0 / usr / sample / alarm / alarm.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005-2007, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * alarm.c - sample alarm program.
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32 | */
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33 | |||
34 | /*
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35 | * Expected output:
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36 | *
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37 | * Alarm sample program
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38 | * Start alarm timer
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39 | * Ring! count=1 time=1000 msec
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40 | * Ring! count=2 time=1200 msec
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41 | * Ring! count=3 time=1600 msec
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42 | * Ring! count=4 time=2200 msec
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43 | * Ring! count=5 time=3000 msec
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44 | * Ring! count=6 time=4000 msec
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45 | * Ring! count=7 time=5200 msec
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46 | * Ring! count=8 time=6600 msec
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47 | * Ring! count=9 time=8200 msec
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48 | * Ring! count=10 time=10000 msec
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49 | * End...
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50 | *
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51 | */
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52 | |||
53 | #include <sys/prex.h> |
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54 | #include <sys/signal.h> |
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55 | #include <stdio.h> |
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56 | |||
57 | static int hz; |
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58 | static volatile u_long count; |
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59 | static u_long start_tick;
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60 | |||
61 | /*
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62 | * Re-program alarm timer as count * 200msec.
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63 | */
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64 | static void |
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65 | alarm_handler(int code)
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66 | { |
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67 | u_long tick; |
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68 | |||
69 | if (code == SIGALRM) {
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70 | count++; |
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71 | if (count > 10) { |
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72 | printf("End...\n");
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73 | task_terminate(task_self()); |
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74 | } |
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75 | timer_alarm(count * 200, 0); |
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76 | sys_time(&tick); |
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77 | printf("Ring! count=%ld time=%d msec\n", count,
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78 | (u_int)((tick - start_tick) * 1000 / hz));
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79 | } |
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80 | exception_return(); |
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81 | } |
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82 | |||
83 | int
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84 | main(int argc, char *argv[]) |
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85 | { |
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86 | struct timerinfo info;
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87 | int code;
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88 | |||
89 | printf("Alarm sample program\n");
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90 | |||
91 | sys_info(INFO_TIMER, &info); |
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92 | if (info.hz == 0) |
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93 | panic("can not get timer tick rate");
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94 | hz = info.hz; |
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95 | |||
96 | /*
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97 | * Install alarm handler
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98 | */
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99 | exception_setup(alarm_handler); |
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100 | timer_sleep(2000, 0); |
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101 | |||
102 | /*
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103 | * Kick first alarm timer.
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104 | */
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105 | printf("Start alarm timer\n");
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106 | count = 0;
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107 | sys_time(&start_tick); |
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108 | timer_alarm(1000, 0); |
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109 | |||
110 | /* Wait alarm */
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111 | while (count < 10) { |
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112 | exception_wait(&code); |
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113 | } |
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114 | printf("Test completed...\n");
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115 | return 0; |
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116 | } |