1 /* Copyright (c) 2017. 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. */
7 #include <simgrid/s4u.hpp>
13 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_app_token_ring, "Messages specific for this s4u example");
16 size_t task_comm_size = 1000000; /* The token is 1MB long*/
17 simgrid::s4u::MailboxPtr my_mailbox;
18 simgrid::s4u::MailboxPtr neighbor_mailbox;
19 unsigned int rank = 0;
22 explicit RelayRunner() = default;
27 rank = std::stoi(simgrid::s4u::this_actor::getName());
28 } catch (std::invalid_argument& ia) {
29 throw std::invalid_argument(std::string("Processes of this example must have a numerical name, not ") +
32 my_mailbox = simgrid::s4u::Mailbox::byName(std::to_string(rank));
33 if (rank + 1 == simgrid::s4u::Engine::getInstance()->getHostCount())
34 /* The last process, which sends the token back to rank 0 */
35 neighbor_mailbox = simgrid::s4u::Mailbox::byName("0");
37 /* The others processes send to their right neighbor (rank+1) */
38 neighbor_mailbox = simgrid::s4u::Mailbox::byName(std::to_string(rank + 1));
41 /* The root process (rank 0) first sends the token then waits to receive it back */
42 XBT_INFO("Host \"%u\" send 'Token' to Host \"%s\"", rank, neighbor_mailbox->getName());
43 neighbor_mailbox->put(xbt_strdup("Token"), task_comm_size);
44 char* res = static_cast<char*>(my_mailbox->get());
45 XBT_INFO("Host \"%u\" received \"%s\"", rank, res);
48 char* res = static_cast<char*>(my_mailbox->get());
49 XBT_INFO("Host \"%u\" received \"%s\"", rank, res);
50 XBT_INFO("Host \"%u\" send 'Token' to Host \"%s\"", rank, neighbor_mailbox->getName());
51 neighbor_mailbox->put(res, task_comm_size);
56 int main(int argc, char** argv)
58 simgrid::s4u::Engine* e = new simgrid::s4u::Engine(&argc, argv);
59 xbt_assert(argc > 1, "Usage: %s platform.xml\n", argv[0]);
60 e->loadPlatform(argv[1]);
62 XBT_INFO("Number of hosts '%zu'", e->getHostCount());
64 std::vector<simgrid::s4u::Host*> list;
65 e->getHostList(&list);
66 for (auto host : list) {
67 /* - Give a unique rank to each host and create a @ref relay_runner process on each */
68 simgrid::s4u::Actor::createActor((std::to_string(id)).c_str(), host, RelayRunner());
72 XBT_INFO("Simulation time %g", e->getClock());