+/* Copyright (c) 2010-2018. The SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+/****************************************************************************
+ *
+ * This is our solution to the first lab of the S4U tutorial
+ * (available online at https://simgrid.frama.io/simgrid/tuto_s4u.html)
+ *
+ * Reading this further before taking the tutorial will SPOIL YOU!!!
+ *
+ ****************************************************************************/
+
+#include <simgrid/s4u.hpp>
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_app_masterworker, "Messages specific for this example");
+
+static void master(std::vector<std::string> args)
+{
+ xbt_assert(args.size() == 5, "The master function expects 4 arguments");
+
+ long workers_count = std::stol(args[1]);
+ long tasks_count = std::stol(args[2]);
+ double compute_cost = std::stod(args[3]);
+ double communication_cost = std::stod(args[4]);
+
+ XBT_INFO("Got %ld workers and %ld tasks to process", workers_count, tasks_count);
+
+ for (int i = 0; i < tasks_count; i++) { /* For each task to be executed: */
+ /* - Select a worker in a round-robin way */
+ std::string worker_rank = std::to_string(i % workers_count);
+ std::string mailbox_name = std::string("worker-") + worker_rank;
+ simgrid::s4u::MailboxPtr mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
+
+ /* - Send the computation cost to that worker */
+ XBT_INFO("Sending task %d of %ld to mailbox '%s'", i, tasks_count, mailbox->get_cname());
+ mailbox->put(new double(compute_cost), communication_cost);
+ }
+
+ XBT_INFO("All tasks have been dispatched. Request all workers to stop.");
+ for (int i = 0; i < workers_count; i++) {
+ /* The workers stop when receiving a negative compute_cost */
+ std::string mailbox_name = std::string("worker-") + std::to_string(i);
+ simgrid::s4u::MailboxPtr mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
+
+ mailbox->put(new double(-1.0), 0);
+ }
+}
+
+static void worker(std::vector<std::string> args)
+{
+ xbt_assert(args.size() == 2, "The worker expects a single argument");
+ long id = std::stol(args[1]);
+
+ const std::string mailbox_name = std::string("worker-") + std::to_string(id);
+ simgrid::s4u::MailboxPtr mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
+
+ double compute_cost;
+ do {
+ double* msg = static_cast<double*>(mailbox->get());
+ compute_cost = *msg;
+ delete msg;
+
+ if (compute_cost > 0) /* If compute_cost is valid, execute a computation of that cost */
+ simgrid::s4u::this_actor::execute(compute_cost);
+
+ } while (compute_cost > 0); /* Stop when receiving an invalid compute_cost */
+
+ XBT_INFO("Exiting now.");
+}
+
+int main(int argc, char* argv[])
+{
+ simgrid::s4u::Engine e(&argc, argv);
+ xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
+
+ /* Register the functions representing the actors */
+ e.register_function("master", &master);
+ e.register_function("worker", &worker);
+
+ /* Load the platform description and then deploy the application */
+ e.load_platform(argv[1]);
+ e.load_deployment(argv[2]);
+
+ /* Run the simulation */
+ e.run();
+
+ XBT_INFO("Simulation is over");
+
+ return 0;
+}