mirror of
https://github.com/RIOT-OS/RIOT.git
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Koen Zandberg
aa84c3e6b8
The msg_time member is only locally used and set before read. It can be removed as the state kept by the member is not used.
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/*
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* Trickle implementation
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*
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* Copyright (C) 2013, 2014 INRIA.
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* 2017 HAW Hamburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @author Eric Engel <eric.engel@fu-berlin.de>
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* @author Cenk Gündoğan <cenk.guendogan@haw-hamburg.de>
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*/
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#include "inttypes.h"
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#include "random.h"
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#include "trickle.h"
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#define ENABLE_DEBUG (0)
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#include "debug.h"
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void trickle_callback(trickle_t *trickle)
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{
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/* Handle k=0 like k=infinity (according to RFC6206, section 6.5) */
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if ((trickle->c < trickle->k) || (trickle->k == 0)) {
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(*trickle->callback.func)(trickle->callback.args);
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}
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trickle_interval(trickle);
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}
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void trickle_interval(trickle_t *trickle)
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{
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assert(trickle->I > 0);
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uint32_t old_interval = trickle->I;
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uint32_t max_interval = trickle->Imin << trickle->Imax;
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uint32_t diff = old_interval - trickle->t;
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trickle->I *= 2;
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if (trickle->I > max_interval) {
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trickle->I = max_interval;
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old_interval = max_interval / 2;
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}
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DEBUG("trickle: I == %" PRIu32 ", diff == %" PRIu32 "\n", trickle->I, diff);
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trickle->c = 0;
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/* old_interval == trickle->I / 2 */
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trickle->t = random_uint32_range(old_interval, trickle->I);
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uint64_t msg_time = (trickle->t + diff) * US_PER_MS;
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xtimer_set_msg64(&trickle->msg_timer, msg_time, &trickle->msg,
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trickle->pid);
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}
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void trickle_reset_timer(trickle_t *trickle)
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{
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assert(trickle->I > trickle->Imin);
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trickle_stop(trickle);
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trickle->I = trickle->t = trickle->Imin;
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trickle_interval(trickle);
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}
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void trickle_start(kernel_pid_t pid, trickle_t *trickle, uint16_t msg_type,
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uint32_t Imin, uint8_t Imax, uint8_t k)
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{
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assert(Imin > 0);
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assert((Imin << Imax) < (UINT32_MAX / 2));
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trickle->pid = pid;
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trickle->c = 0;
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trickle->k = k;
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trickle->Imin = Imin;
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trickle->Imax = Imax;
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trickle->I = trickle->t = random_uint32_range(trickle->Imin,
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4 * trickle->Imin);
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trickle->pid = pid;
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trickle->msg.content.ptr = trickle;
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trickle->msg.type = msg_type;
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trickle_interval(trickle);
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}
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void trickle_stop(trickle_t *trickle)
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{
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xtimer_remove(&trickle->msg_timer);
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}
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void trickle_increment_counter(trickle_t *trickle)
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{
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trickle->c++;
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}
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