Annotation of prex/usr/sample/alarm/alarm.c, Revision 1.1.1.1
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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