1 /* Copyright (c) 2012-2014. 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. */
9 #include <xbt/RngStream.h>
11 static void task_free(void *data);
13 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_tracker, "Messages specific for the tracker");
15 * Tracker main function
16 * @param argc number of arguments
17 * @param argv arguments
19 int tracker(int argc, char *argv[])
23 RngStream stream = (RngStream) MSG_host_get_property_value(MSG_host_self(), "stream");
25 xbt_assert(argc == 2, "Wrong number of arguments for the tracker.");
27 double deadline = atof(argv[1]);
28 xbt_assert(deadline > 0, "Wrong deadline supplied");
29 //Building peers array
30 xbt_dynar_t peers_list = xbt_dynar_new(sizeof(int), NULL);
32 XBT_INFO("Tracker launched.");
34 msg_comm_t comm_received = NULL;
35 msg_task_t task_received = NULL;
37 while (MSG_get_clock() < deadline) {
38 if (comm_received == NULL) {
39 comm_received = MSG_task_irecv(&task_received, TRACKER_MAILBOX);
41 if (MSG_comm_test(comm_received)) {
42 //Check for correct status
43 if (MSG_comm_get_status(comm_received) == MSG_OK) {
44 //Retrieve the data sent by the peer.
45 tracker_task_data_t data = MSG_task_get_data(task_received);
46 //Add the peer to our peer list.
47 if (!is_in_list(peers_list, data->peer_id)) {
48 xbt_dynar_push_as(peers_list, int, data->peer_id);
50 //Sending peers to the peer
52 int peers_length = xbt_dynar_length(peers_list);
53 for (i = 0; i < MAXIMUM_PAIRS && i < peers_length; i++) {
56 xbt_dynar_get_as(peers_list,
57 RngStream_RandInt(stream, 0, peers_length - 1),
59 } while (is_in_list(data->peers, next_peer));
60 xbt_dynar_push_as(data->peers, int, next_peer);
62 //setting the interval
63 data->interval = TRACKER_QUERY_INTERVAL;
64 //sending the task back to the peer.
65 MSG_task_dsend(task_received, data->mailbox, task_free);
66 //destroy the communication.
68 MSG_comm_destroy(comm_received);
75 //Free the remaining communication if any
77 MSG_comm_destroy(comm_received);
80 xbt_dynar_free(&peers_list);
82 XBT_INFO("Tracker is leaving");
88 * Build a new task for the tracker.
89 * @param issuer_host_name Hostname of the issuer. For debugging purposes
91 tracker_task_data_t tracker_task_data_new(const char *issuer_host_name,
92 const char *mailbox, int peer_id,
93 int uploaded, int downloaded,
96 tracker_task_data_t task = xbt_new(s_tracker_task_data_t, 1);
98 task->type = TRACKER_TASK_QUERY;
99 task->issuer_host_name = issuer_host_name;
100 task->mailbox = mailbox;
101 task->peer_id = peer_id;
102 task->uploaded = uploaded;
103 task->downloaded = downloaded;
106 task->peers = xbt_dynar_new(sizeof(int), NULL);
112 * Free a tracker task that has not succefully been sent.
113 * @param data Task to free
115 static void task_free(void *data)
117 tracker_task_data_t task_data = MSG_task_get_data(data);
118 tracker_task_data_free(task_data);
119 MSG_task_destroy(data);
123 * Free the data structure of a tracker task.
124 * @param task data to free
126 void tracker_task_data_free(tracker_task_data_t task)
128 xbt_dynar_free(&task->peers);
133 * Returns if the given id is in the peers lsit
134 * @param peers dynar containing the peers
135 * @param id identifier of the peer to test
137 int is_in_list(xbt_dynar_t peers, int id)
141 xbt_dynar_foreach(peers, i, elm) {