1 /* Copyright (c) 2008-2016. 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 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_app_token_ring, "Messages specific for this msg example");
10 /* Main function of all processes used in this example */
11 static int relay_runner(int argc, char *argv[])
13 xbt_assert(argc==0, "The relay_runner function does not accept any parameter from the XML deployment file");
14 unsigned int task_comm_size = 1000000; /* The token is 1MB long*/
15 int rank = xbt_str_parse_int(MSG_process_get_name(MSG_process_self()), "Any process of this example must have a numerical name, not %s");
19 /* The root process (rank 0) first sends the token then waits to receive it back */
20 snprintf(mailbox,255, "%d", rank+1);
21 msg_task_t task = MSG_task_create("Token", 0, task_comm_size, NULL);
22 XBT_INFO("Host \"%d\" send '%s' to Host \"%s\"", rank, task->name,mailbox);
23 MSG_task_send(task, mailbox);
25 int res = MSG_task_receive(&task, MSG_process_get_name(MSG_process_self()));
26 xbt_assert(res == MSG_OK, "MSG_task_get failed");
27 XBT_INFO("Host \"%d\" received \"%s\"", rank, MSG_task_get_name(task));
28 MSG_task_destroy(task);
31 /* The others processes receive from their left neighbor (rank-1) and send to their right neighbor (rank+1) */
32 msg_task_t task = NULL;
33 int res = MSG_task_receive(&task, MSG_process_get_name(MSG_process_self()));
34 xbt_assert(res == MSG_OK, "MSG_task_get failed");
35 XBT_INFO("Host \"%d\" received \"%s\"",rank, MSG_task_get_name(task));
37 if (rank+1 == MSG_get_host_number())
38 /* But the last process, which sends the token back to rank 0 */
39 snprintf(mailbox,255, "0");
41 snprintf(mailbox,255, "%d", rank+1);
42 XBT_INFO("Host \"%d\" send '%s' to Host \"%s\"",rank,task->name,mailbox);
43 MSG_task_send(task, mailbox);
48 int main(int argc, char *argv[])
50 MSG_init(&argc, argv);
51 xbt_assert(argc>1, "Usage: %s platform.xml\n",argv[0]);
52 MSG_create_environment(argv[1]); /* - Load the platform description */
53 xbt_dynar_t hosts = MSG_hosts_as_dynar();
55 XBT_INFO("Number of hosts '%d'", MSG_get_host_number());
58 xbt_dynar_foreach (hosts, i, h) { /* - Give a unique rank to each host and create a @ref relay_runner process on each */
59 char* name_host = bprintf("%u",i);
60 MSG_process_create(name_host, relay_runner, NULL, h);
63 xbt_dynar_free(&hosts);
65 int res = MSG_main(); /* - Run the simulation */
66 XBT_INFO("Simulation time %g", MSG_get_clock());