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 foo(int argc, char *argv[])
13 unsigned int task_comm_size = 1000000; /* The token is 1MB long*/
14 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");
16 msg_task_t task = NULL;
17 XBT_ATTRIB_UNUSED int res;
18 if (rank == 0){ /* - The root (rank 0) first sends the token then waits to receive it back */
19 snprintf(mailbox,255, "%d", rank+1);
20 task = MSG_task_create("Token", 0, task_comm_size, NULL);
21 XBT_INFO("Host \"%d\" send '%s' to Host \"%s\"", rank, task->name,mailbox);
22 MSG_task_send(task, mailbox);
24 res = MSG_task_receive(&(task), MSG_process_get_name(MSG_process_self()));
25 xbt_assert(res == MSG_OK, "MSG_task_get failed");
26 XBT_INFO("Host \"%d\" received \"%s\"", rank, MSG_task_get_name(task));
27 MSG_task_destroy(task);
28 } else{ /* - The others receive from their left neighbor (rank-1) and send to their right neighbor (rank+1) */
29 res = MSG_task_receive(&(task), MSG_process_get_name(MSG_process_self()));
30 xbt_assert(res == MSG_OK, "MSG_task_get failed");
31 XBT_INFO("Host \"%d\" received \"%s\"",rank, MSG_task_get_name(task));
33 if(rank+1 == MSG_get_host_number()) /* - Except for the last one which sends the token back to rank 0 */
34 snprintf(mailbox,255, "0");
36 snprintf(mailbox,255, "%d", rank+1);
37 XBT_INFO("Host \"%d\" send '%s' to Host \"%s\"",rank,task->name,mailbox);
38 MSG_task_send(task, mailbox);
43 int main(int argc, char *argv[])
46 MSG_init(&argc, argv);
47 MSG_create_environment(argv[1]); /* - Load the platform description */
48 xbt_dynar_t hosts = MSG_hosts_as_dynar();
51 XBT_INFO("Number of host '%d'",MSG_get_host_number());
52 xbt_dynar_foreach (hosts, i, h){ /* - Give a unique rank to each host and create a @ref foo process on each */
53 char* name_host = bprintf("%u",i);
54 MSG_process_create(name_host, foo, NULL, h);
57 xbt_dynar_free(&hosts);
59 int res = MSG_main(); /* - Run the simulation */
60 XBT_INFO("Simulation time %g", MSG_get_clock());