1 /* Copyright (c) 2010-2019. 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 /* This example shows how to use simgrid::s4u::this_actor::wait() to wait for a given communication.
8 * As for the other asynchronous examples, the sender initiate all the messages it wants to send and
9 * pack the resulting simgrid::s4u::CommPtr objects in a vector. All messages thus occurs concurrently.
11 * The sender then loops until there is no ongoing communication.
14 #include "simgrid/s4u.hpp"
19 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_async_wait, "Messages specific for this s4u example");
21 static int sender(int argc, char** argv)
23 xbt_assert(argc == 4, "Expecting 3 parameters from the XML deployment file but got %d", argc);
24 long messages_count = std::stol(argv[1]); /* - number of tasks */
25 double msg_size = std::stol(argv[2]); /* - communication cost in bytes */
26 long receivers_count = std::stod(argv[3]); /* - number of receivers */
28 /* Vector in which we store all ongoing communications */
29 std::vector<simgrid::s4u::CommPtr> pending_comms;
31 /* Make a vector of the mailboxes to use */
32 std::vector<simgrid::s4u::Mailbox*> mboxes;
33 for (int i = 0; i < receivers_count; i++)
34 mboxes.push_back(simgrid::s4u::Mailbox::by_name(std::string("receiver-") + std::to_string(i)));
36 /* Start dispatching all messages to receivers, in a round robin fashion */
37 for (int i = 0; i < messages_count; i++) {
38 std::string msg_content = std::string("Message ") + std::to_string(i);
39 // Copy the data we send: 'msg_content' is not a stable storage location.
40 // It will be destroyed when this actor leaves the loop, ie before the receiver gets it
41 std::string* payload = new std::string(msg_content);
43 XBT_INFO("Send '%s' to '%s'", msg_content.c_str(), mboxes[i % receivers_count]->get_cname());
45 /* Create a communication representing the ongoing communication, and store it in pending_comms */
46 simgrid::s4u::CommPtr comm = mboxes[i % receivers_count]->put_async(payload, msg_size);
47 pending_comms.push_back(comm);
50 /* Start sending messages to let the workers know that they should stop */
51 for (int i = 0; i < receivers_count; i++) {
52 XBT_INFO("Send 'finalize' to 'receiver-%d'", i);
53 simgrid::s4u::CommPtr comm = mboxes[i]->put_async(new std::string("finalize"), 0);
54 pending_comms.push_back(comm);
56 XBT_INFO("Done dispatching all messages");
58 /* Now that all message exchanges were initiated, wait for their completion, in order of creation. */
59 while (not pending_comms.empty()) {
60 simgrid::s4u::CommPtr comm = pending_comms.back();
62 pending_comms.pop_back(); // remove it from the list
65 XBT_INFO("Goodbye now!");
69 /* Receiver actor expects 1 argument: its ID */
70 static int receiver(int argc, char** argv)
72 xbt_assert(argc == 2, "Expecting one parameter from the XML deployment file but got %d", argc);
73 simgrid::s4u::Mailbox* mbox = simgrid::s4u::Mailbox::by_name(std::string("receiver-") + argv[1]);
75 XBT_INFO("Wait for my first message");
76 for (bool cont = true; cont;) {
77 std::string* received = static_cast<std::string*>(mbox->get());
78 XBT_INFO("I got a '%s'.", received->c_str());
79 if (*received == "finalize")
80 cont = false; // If it's a finalize message, we're done.
86 int main(int argc, char *argv[])
88 xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
90 simgrid::s4u::Engine e(&argc, argv);
91 e.register_function("sender", &sender);
92 e.register_function("receiver", &receiver);
94 e.load_platform(argv[1]);
95 e.load_deployment(argv[2]);