nes-proj/os/net/app-layer/coap/coap-timer-default.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 driver implementation based on Contiki etimers
* \author
* Niclas Finne <nfi@sics.se>
* Joakim Eriksson <joakime@sics.se>
*/
/**
* \addtogroup coap-timer
* @{
*
* \defgroup coap-timer-default CoAP timer for Contiki-NG
* @{
*
* This is an implementation of CoAP timer for Contiki-NG.
*/
#include "coap-timer.h"
#include "sys/clock.h"
#include "sys/etimer.h"
#include "sys/process.h"
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/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "coap-timer"
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#define LOG_LEVEL LOG_LEVEL_NONE
PROCESS(coap_timer_process, "coap timer process");
static uint64_t current_time;
static struct etimer timer;
/*---------------------------------------------------------------------------*/
static void
update_timer(void)
{
uint64_t remaining;
remaining = coap_timer_time_to_next_expiration();
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LOG_DBG("remaining %lu msec\n", (unsigned long)remaining);
if(remaining == 0) {
/* Run as soon as possible */
process_poll(&coap_timer_process);
} else {
remaining *= CLOCK_SECOND;
remaining /= 1000;
if(remaining > CLOCK_SECOND * 60) {
/* Make sure the CoAP timer clock is updated at least once per minute */
remaining = CLOCK_SECOND * 60;
} else if(remaining < 1) {
/* Wait minimum one system clock tick */
remaining = 1;
}
etimer_set(&timer, (clock_time_t)remaining);
}
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(coap_timer_process, ev, data)
{
PROCESS_BEGIN();
etimer_set(&timer, CLOCK_SECOND);
while(1) {
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_TIMER ||
ev == PROCESS_EVENT_POLL);
if(coap_timer_run()) {
/* Needs to run again */
process_poll(&coap_timer_process);
} else {
update_timer();
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
static uint64_t
uptime(void)
{
static clock_time_t last;
clock_time_t now;
uint64_t diff;
now = clock_time();
diff = (clock_time_t)(now - last);
if(diff > 0) {
current_time += (diff * 1000) / CLOCK_SECOND;
last = now;
}
return current_time;
}
/*---------------------------------------------------------------------------*/
static void
init(void)
{
process_start(&coap_timer_process, NULL);
}
/*---------------------------------------------------------------------------*/
static void
update(void)
{
process_poll(&coap_timer_process);
}
/*---------------------------------------------------------------------------*/
const coap_timer_driver_t coap_timer_default_driver = {
.init = init,
.uptime = uptime,
.update = update,
};
/*---------------------------------------------------------------------------*/
/** @} */
/** @} */