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rtimer-arch.c
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1/*
2 * Copyright (c) 2007, Swedish Institute of Computer Science.
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 Institute nor the names of its 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 INSTITUTE 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 INSTITUTE 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 * This file is part of the Contiki operating system.
30 *
31 */
32
33/**
34 * \file
35 * Native (non-specific) code for the Contiki real-time module rt
36 * \author
37 * Adam Dunkels <adam@sics.se>
38 */
39
40#include <signal.h>
41#include <sys/time.h>
42#include <stddef.h>
43
44#include "sys/rtimer.h"
45#include "sys/clock.h"
46
47#define DEBUG 0
48#if DEBUG
49#include <stdio.h>
50#define PRINTF(...) printf(__VA_ARGS__)
51#else
52#define PRINTF(...)
53#endif
54
55/*---------------------------------------------------------------------------*/
56static void
57interrupt(int sig)
58{
59 signal(sig, interrupt);
61}
62/*---------------------------------------------------------------------------*/
63void
65{
66 signal(SIGALRM, interrupt);
67}
68/*---------------------------------------------------------------------------*/
69void
70rtimer_arch_schedule(rtimer_clock_t t)
71{
72 struct itimerval val;
73 rtimer_clock_t c;
74
75 c = t - clock_time();
76
77 val.it_value.tv_sec = c / CLOCK_SECOND;
78 val.it_value.tv_usec = (c % CLOCK_SECOND) * CLOCK_SECOND;
79
80 PRINTF("rtimer_arch_schedule time %"PRIu32 " %"PRIu32 " in %ld.%ld seconds\n",
81 t, c, (long)val.it_value.tv_sec, (long)val.it_value.tv_usec);
82
83 val.it_interval.tv_sec = val.it_interval.tv_usec = 0;
84 setitimer(ITIMER_REAL, &val, NULL);
85}
86/*---------------------------------------------------------------------------*/
clock_time_t clock_time(void)
Get the current clock time.
Definition clock.c:118
void rtimer_arch_init(void)
We don't need to explicitly initialise anything but this routine is required by the API.
Definition rtimer-arch.c:59
void rtimer_arch_schedule(rtimer_clock_t t)
Schedules an rtimer task to be triggered at time t.
Definition rtimer-arch.c:65
#define CLOCK_SECOND
A second, measured in system clock time.
Definition clock.h:103
void rtimer_run_next(void)
Execute the next real-time task and schedule the next task, if any.
Definition rtimer.c:78
Header file for the real-time timer module.