nes-proj/os/net/app-layer/coap/coap-timer.c

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/*
* Copyright (c) 2016, SICS, Swedish ICT AB.
* 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.
*/
/**
* \file
* CoAP timer implementation.
* \author
* Niclas Finne <nfi@sics.se>
* Joakim Eriksson <joakime@sics.se>
*/
/**
* \addtogroup coap-timer
* @{
*/
#include "coap-timer.h"
#include "lib/list.h"
#include "sys/cc.h"
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/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "coap-timer"
#define LOG_LEVEL LOG_LEVEL_NONE
LIST(timer_list);
static uint8_t is_initialized;
/*---------------------------------------------------------------------------*/
static void
add_timer(coap_timer_t *timer)
{
coap_timer_t *n, *l, *p;
if(!is_initialized) {
/* The coap_timer system has not yet been initialized */
coap_timer_init();
}
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LOG_DBG("adding timer %p at %lu\n", timer,
(unsigned long)timer->expiration_time);
p = list_head(timer_list);
/* Make sure the timer is not already added to the timer list */
list_remove(timer_list, timer);
for(l = NULL, n = list_head(timer_list); n != NULL; l = n, n = n->next) {
if(timer->expiration_time < n->expiration_time) {
list_insert(timer_list, l, timer);
timer = NULL;
break;
}
}
if(timer != NULL) {
list_insert(timer_list, l, timer);
}
if(p != list_head(timer_list)) {
/* The next timer to expire has changed so we need to notify the driver */
COAP_TIMER_DRIVER.update();
}
}
/*---------------------------------------------------------------------------*/
void
coap_timer_stop(coap_timer_t *timer)
{
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LOG_DBG("stopping timer %p\n", timer);
/* Mark timer as expired right now */
timer->expiration_time = coap_timer_uptime();
list_remove(timer_list, timer);
}
/*---------------------------------------------------------------------------*/
void
coap_timer_set(coap_timer_t *timer, uint64_t time)
{
timer->expiration_time = coap_timer_uptime() + time;
add_timer(timer);
}
/*---------------------------------------------------------------------------*/
void
coap_timer_reset(coap_timer_t *timer, uint64_t time)
{
timer->expiration_time += time;
add_timer(timer);
}
/*---------------------------------------------------------------------------*/
uint64_t
coap_timer_time_to_next_expiration(void)
{
uint64_t now;
coap_timer_t *next;
next = list_head(timer_list);
if(next == NULL) {
/* No pending timers - return a time in the future */
return 60000;
}
now = coap_timer_uptime();
if(now < next->expiration_time) {
return next->expiration_time - now;
}
/* The next timer should already have expired */
return 0;
}
/*---------------------------------------------------------------------------*/
int
coap_timer_run(void)
{
uint64_t now;
coap_timer_t *next;
/* Always get the current time because it might trigger clock updates */
now = coap_timer_uptime();
next = list_head(timer_list);
if(next == NULL) {
/* No pending timers */
return 0;
}
if(next->expiration_time <= now) {
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LOG_DBG("timer %p expired at %lu\n", next, (unsigned long)now);
/* This timer should expire now */
list_remove(timer_list, next);
if(next->callback) {
next->callback(next);
}
/* The next timer has changed */
COAP_TIMER_DRIVER.update();
/* Check if there is another pending timer */
next = list_head(timer_list);
if(next != NULL && next->expiration_time <= coap_timer_uptime()) {
/* Need to run again */
return 1;
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
void
coap_timer_init(void)
{
if(is_initialized) {
return;
}
is_initialized = 1;
list_init(timer_list);
if(COAP_TIMER_DRIVER.init) {
COAP_TIMER_DRIVER.init();
}
}
/*---------------------------------------------------------------------------*/
/** @} */