contiki/core/sys/ctimer.c

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2007-03-31 18:31:27 +00:00
/**
* \addtogroup ctimer
* @{
*/
/*
* Copyright (c) 2006, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
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* Callback timer implementation
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "sys/ctimer.h"
#include "contiki.h"
#include "lib/list.h"
LIST(ctimer_list);
static char initialized;
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#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
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PROCESS(ctimer_process, "Ctimer process");
PROCESS_THREAD(ctimer_process, ev, data)
{
struct ctimer *c;
PROCESS_BEGIN();
for(c = list_head(ctimer_list); c != NULL; c = c->next) {
etimer_set(&c->etimer, c->etimer.timer.interval);
}
initialized = 1;
while(1) {
PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_TIMER);
for(c = list_head(ctimer_list); c != NULL; c = c->next) {
if(&c->etimer == data) {
list_remove(ctimer_list, c);
PROCESS_CONTEXT_BEGIN(c->p);
if(c->f != NULL) {
c->f(c->ptr);
}
PROCESS_CONTEXT_END(c->p);
break;
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
void
ctimer_init(void)
{
initialized = 0;
list_init(ctimer_list);
process_start(&ctimer_process, NULL);
}
/*---------------------------------------------------------------------------*/
void
ctimer_set(struct ctimer *c, clock_time_t t,
void (*f)(void *), void *ptr)
{
PRINTF("ctimer_set %p %u\n", c, (unsigned)t);
c->p = PROCESS_CURRENT();
c->f = f;
c->ptr = ptr;
if(initialized) {
PROCESS_CONTEXT_BEGIN(&ctimer_process);
etimer_set(&c->etimer, t);
PROCESS_CONTEXT_END(&ctimer_process);
} else {
c->etimer.timer.interval = t;
}
list_remove(ctimer_list, c);
list_add(ctimer_list, c);
}
/*---------------------------------------------------------------------------*/
void
ctimer_reset(struct ctimer *c)
{
if(initialized) {
PROCESS_CONTEXT_BEGIN(&ctimer_process);
etimer_reset(&c->etimer);
PROCESS_CONTEXT_END(&ctimer_process);
}
list_remove(ctimer_list, c);
list_add(ctimer_list, c);
}
/*---------------------------------------------------------------------------*/
void
ctimer_restart(struct ctimer *c)
{
if(initialized) {
PROCESS_CONTEXT_BEGIN(&ctimer_process);
etimer_restart(&c->etimer);
PROCESS_CONTEXT_END(&ctimer_process);
}
list_remove(ctimer_list, c);
list_add(ctimer_list, c);
}
/*---------------------------------------------------------------------------*/
void
ctimer_stop(struct ctimer *c)
{
if(initialized) {
etimer_stop(&c->etimer);
} else {
c->etimer.next = NULL;
c->etimer.p = PROCESS_NONE;
}
list_remove(ctimer_list, c);
}
/*---------------------------------------------------------------------------*/
int
ctimer_expired(struct ctimer *c)
{
struct ctimer *t;
if(initialized) {
return etimer_expired(&c->etimer);
}
for(t = list_head(ctimer_list); t != NULL; t = t->next) {
if(t == c) {
return 0;
}
}
return 1;
}
/*---------------------------------------------------------------------------*/
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/** @} */