157 lines
4.9 KiB
C
157 lines
4.9 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: rtimer.c,v 1.2 2007/03/28 20:28:22 adamdunkels Exp $
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*/
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#include "sys/rtimer.h"
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#include "contiki.h"
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#define LIST_SIZE 16
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static struct rtimer *rtimers[LIST_SIZE];
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static u8_t next, firstempty;
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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void
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rtimer_init(void)
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{
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next = 0;
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firstempty = 0;
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rtimer_arch_init();
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}
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/*---------------------------------------------------------------------------*/
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int
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rtimer_set(struct rtimer *rtimer, rtimer_clock_t time, rtimer_clock_t duration,
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void (* func)(struct rtimer *t, void *ptr), void *ptr)
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{
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int i;
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PRINTF("rtimer_set time %d\n", time);
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rtimer->func = func;
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rtimer->ptr = ptr;
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/* Check if rtimer queue is full. */
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if(firstempty == (next - 1) % LIST_SIZE) {
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PRINTF("rtimer_set: next %d firstempty %d full\n", next, firstempty);
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return RTIMER_ERR_FULL;
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}
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/* Check if it is possible to run this rtimer at the requested
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time. */
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for(i = next; i != firstempty;
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i = (i + 1) % LIST_SIZE) {
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/* XXX: should check a range of time not just the same precise
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moment. */
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if(rtimers[i]->time == time) {
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PRINTF("rtimer_set: next %d firstempty %d time %d == %d\n",
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next, firstempty, rtimers[i]->time, time);
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return RTIMER_ERR_TIME;
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}
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}
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/* Put the rtimer at the end of the rtimer list. */
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rtimer->time = time;
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rtimers[firstempty] = rtimer;
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PRINTF("rtimer_post: putting rtimer %s as %d\n", rtimer->name, firstempty);
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firstempty = (firstempty + 1) % LIST_SIZE;
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/* PRINTF("rtimer_post: next %d firstempty %d scheduling soon\n",
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next, firstempty);*/
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/* Check if this is the first rtimer on the list. If so, we need to
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run the rtimer_arch_schedule() function to get the ball rolling. */
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if(firstempty == (next + 1) % LIST_SIZE) {
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PRINTF("rtimer_set scheduling %d %s (%d)\n",
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next, rtimers[next]->name, rtimers[next]->time);
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rtimer_arch_schedule(rtimers[next]->time);
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}
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return RTIMER_OK;
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}
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/*---------------------------------------------------------------------------*/
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void
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rtimer_run_next(void)
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{
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int i, n;
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struct rtimer *t;
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t = rtimers[next];
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/* Increase the pointer to the next rtimer. */
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next = (next + 1) % LIST_SIZE;
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/* Run the rtimer. */
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PRINTF("rtimer_run_next running %s\n", t->name);
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t->func(t, t->ptr);
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if(next == firstempty) {
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PRINTF("rtimer_run_next: empty rtimer list\n");
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/* The list is empty, no more rtimers to schedule. */
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return;
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}
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/* Find the next rtimer to run. */
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n = next;
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for(i = next; i != firstempty; i = (i + 1) % LIST_SIZE) {
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PRINTF("rtimer_run_next checking %s (%d) against %s (%d)\n",
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rtimers[i]->name, rtimers[i]->time,
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rtimers[n]->name, rtimers[n]->time);
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if(RTIMER_CLOCK_LT(rtimers[i]->time, rtimers[n]->time)) {
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n = i;
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}
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}
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PRINTF("rtimer_run_next next rtimer is %d %s (%d)\n",
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n, rtimers[n]->name, rtimers[n]->time);
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/* Put the next rtimer first in the rtimer list. */
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t = rtimers[next];
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rtimers[next] = rtimers[n];
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rtimers[n] = t;
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PRINTF("rtimer_run_next scheduling %d %s (%d)\n",
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next, rtimers[next]->name, rtimers[next]->time);
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rtimer_arch_schedule(rtimers[next]->time);
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}
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/*---------------------------------------------------------------------------*/
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