1 /* Copyright (c) 2012-2017. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "routing_table.h"
9 #include "simgrid/msg.h"
11 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_kademlia_routing_table, "Messages specific for this msg example");
13 /** @brief Initialization of a node routing table. */
14 routing_table_t routing_table_init(unsigned int node_id)
16 routing_table_t table = xbt_new(s_routing_table_t, 1);
17 table->buckets = xbt_new(s_bucket_t, identifier_size + 1);
18 for (unsigned int i = 0; i < identifier_size + 1; i++) {
19 table->buckets[i].nodes = xbt_dynar_new(sizeof(unsigned int), NULL);
20 table->buckets[i].id = i;
26 /** @brief Frees the routing table */
27 void routing_table_free(routing_table_t table)
31 for (i = 0; i <= identifier_size; i++) {
32 xbt_dynar_free(&table->buckets[i].nodes);
34 xbt_free(table->buckets);
38 /** Returns if the routing table contains the id. */
39 unsigned int routing_table_contains(routing_table_t table, unsigned int node_id)
41 bucket_t bucket = routing_table_find_bucket(table, node_id);
42 return bucket_contains(bucket, node_id);
45 /**@brief prints the routing table, to debug stuff. */
46 void routing_table_print(routing_table_t table)
50 XBT_INFO("Routing table of %08x:", table->id);
52 for (unsigned int i = 0; i <= identifier_size; i++) {
53 if (!xbt_dynar_is_empty(table->buckets[i].nodes)) {
54 XBT_INFO("Bucket number %u: ", i);
55 xbt_dynar_foreach(table->buckets[i].nodes, j, value) {
56 XBT_INFO("Element %u: %08x", j, value);
62 /** @brief Finds an identifier in a bucket and returns its position or returns -1 if it doesn't exists
63 * @param bucket the bucket in which we try to find our identifier
66 unsigned int bucket_find_id(bucket_t bucket, unsigned int id)
69 unsigned int current_id;
70 xbt_dynar_foreach(bucket->nodes, i, current_id){
71 if (id == current_id){
78 /** Returns if the bucket contains an identifier. */
79 unsigned int bucket_contains(bucket_t bucket, unsigned int id)
81 return xbt_dynar_member(bucket->nodes, &id);
84 /** @brief Finds the corresponding bucket in a routing table for a given identifier
85 * @param table the routing table
86 * @param id the identifier
87 * @return the bucket in which the the identifier would be.
89 bucket_t routing_table_find_bucket(routing_table_t table, unsigned int id)
91 unsigned int xor_number = table->id ^ id;
92 unsigned int prefix = get_node_prefix(xor_number, identifier_size);
93 xbt_assert(prefix <= identifier_size, "Tried to return a bucket that doesn't exist.");
94 bucket_t bucket = &table->buckets[prefix];