1 /* Copyright (c) 2012. 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. */
8 #include <xbt/RngStream.h>
10 static void task_free(void *data);
12 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_tracker,
13 "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 = MSG_host_get_data(MSG_host_self());
26 xbt_assert(argc == 2, "Wrong number of arguments for the tracker.");
28 double deadline = atof(argv[1]);
29 xbt_assert(deadline > 0, "Wrong deadline supplied");
30 //Building peers array
31 xbt_dynar_t peers_list = xbt_dynar_new(sizeof(int), NULL);
33 XBT_INFO("Tracker launched.");
35 msg_comm_t comm_received = NULL;
36 msg_task_t task_received = NULL;
38 while (MSG_get_clock() < deadline) {
39 if (comm_received == NULL) {
40 comm_received = MSG_task_irecv(&task_received, TRACKER_MAILBOX);
42 if (MSG_comm_test(comm_received)) {
43 //Check for correct status
44 if (MSG_comm_get_status(comm_received) == MSG_OK) {
45 //Retrieve the data sent by the peer.
46 tracker_task_data_t data = MSG_task_get_data(task_received);
47 //Add the peer to our peer list.
48 if (!is_in_list(peers_list, data->peer_id)) {
49 xbt_dynar_push_as(peers_list, int, data->peer_id);
51 //Sending peers to the peer
53 int peers_length = xbt_dynar_length(peers_list);
54 for (i = 0; i < MAXIMUM_PAIRS && i < peers_length; i++) {
57 xbt_dynar_get_as(peers_list,
58 RngStream_RandInt(stream, 0, peers_length - 1),
60 } while (is_in_list(data->peers, next_peer));
61 xbt_dynar_push_as(data->peers, int, next_peer);
63 //setting the interval
64 data->interval = TRACKER_QUERY_INTERVAL;
65 //sending the task back to the peer.
66 MSG_task_dsend(task_received, data->mailbox, task_free);
67 //destroy the communication.
69 MSG_comm_destroy(comm_received);
76 //Free the remaining communication if any
78 MSG_comm_destroy(comm_received);
81 xbt_dynar_free(&peers_list);
83 XBT_INFO("Tracker is leaving");
89 * Build a new task for the tracker.
90 * @param issuer_host_name Hostname of the issuer. For debugging purposes
92 tracker_task_data_t tracker_task_data_new(const char *issuer_host_name,
93 const char *mailbox, int peer_id,
94 int uploaded, int downloaded,
97 tracker_task_data_t task = xbt_new(s_tracker_task_data_t, 1);
99 task->type = TRACKER_TASK_QUERY;
100 task->issuer_host_name = issuer_host_name;
101 task->mailbox = mailbox;
102 task->peer_id = peer_id;
103 task->uploaded = uploaded;
104 task->downloaded = downloaded;
107 task->peers = xbt_dynar_new(sizeof(int), NULL);
113 * Free a tracker task that has not succefully been sent.
114 * @param data Task to free
116 static void task_free(void *data)
118 tracker_task_data_t task_data = MSG_task_get_data(data);
119 tracker_task_data_free(task_data);
120 MSG_task_destroy(data);
124 * Free the data structure of a tracker task.
125 * @param task data to free
127 void tracker_task_data_free(tracker_task_data_t task)
129 xbt_dynar_free(&task->peers);
134 * Returns if the given id is in the peers lsit
135 * @param peers dynar containing the peers
136 * @param id identifier of the peer to test
138 int is_in_list(xbt_dynar_t peers, int id)
142 xbt_dynar_foreach(peers, i, elm) {