1 /* Copyright (c) 2008-2018. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "simgrid/msg.h"
8 #include <stdio.h> /* snprintf */
10 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_app_token_ring, "Messages specific for this msg example");
12 /* Main function of all processes used in this example */
13 static int relay_runner(int argc, char* argv[])
15 xbt_assert(argc == 0, "The relay_runner function does not accept any parameter from the XML deployment file");
16 int rank = xbt_str_parse_int(MSG_process_get_name(MSG_process_self()),
17 "Any process of this example must have a numerical name, not %s");
21 /* The root process (rank 0) first sends the token then waits to receive it back */
22 snprintf(mailbox, 255, "%d", rank + 1);
23 unsigned int task_comm_size = 1000000; /* The token is 1MB long*/
24 msg_task_t task = MSG_task_create("Token", 0, task_comm_size, NULL);
25 XBT_INFO("Host \"%d\" send '%s' to Host \"%s\"", rank, task->name, mailbox);
26 MSG_task_send(task, mailbox);
28 int res = MSG_task_receive(&task, MSG_process_get_name(MSG_process_self()));
29 xbt_assert(res == MSG_OK, "MSG_task_get failed");
30 XBT_INFO("Host \"%d\" received \"%s\"", rank, MSG_task_get_name(task));
31 MSG_task_destroy(task);
34 /* The others processes receive from their left neighbor (rank-1) and send to their right neighbor (rank+1) */
35 msg_task_t task = NULL;
36 int res = MSG_task_receive(&task, MSG_process_get_name(MSG_process_self()));
37 xbt_assert(res == MSG_OK, "MSG_task_get failed");
38 XBT_INFO("Host \"%d\" received \"%s\"", rank, MSG_task_get_name(task));
40 if (rank + 1 == MSG_get_host_number())
41 /* But the last process, which sends the token back to rank 0 */
42 snprintf(mailbox, 255, "0");
44 snprintf(mailbox, 255, "%d", rank + 1);
45 XBT_INFO("Host \"%d\" send '%s' to Host \"%s\"", rank, task->name, mailbox);
46 MSG_task_send(task, mailbox);
51 int main(int argc, char* argv[])
53 MSG_init(&argc, argv);
54 xbt_assert(argc > 1, "Usage: %s platform.xml\n", argv[0]);
55 MSG_create_environment(argv[1]); /* - Load the platform description */
56 xbt_dynar_t hosts = MSG_hosts_as_dynar();
58 XBT_INFO("Number of hosts '%zu'", MSG_get_host_number());
61 xbt_dynar_foreach (hosts, i,
62 h) { /* - Give a unique rank to each host and create a @ref relay_runner process on each */
63 char* name_host = bprintf("%u", i);
64 MSG_process_create(name_host, relay_runner, NULL, h);
67 xbt_dynar_free(&hosts);
69 int res = MSG_main(); /* - Run the simulation */
70 XBT_INFO("Simulation time %g", MSG_get_clock());