1 /* Copyright (c) 2023. 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"
18 namespace sg4 = simgrid::s4u;
20 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_mess_wait, "Messages specific for this s4u example");
22 static void sender(int messages_count)
24 sg4::MessageQueue* mqueue = sg4::MessageQueue::by_name("control");
26 sg4::this_actor::sleep_for(0.5);
28 for (int i = 0; i < messages_count; i++) {
29 std::string msg_content = "Message " + std::to_string(i);
30 // Copy the data we send: the 'msg_content' variable is not a stable storage location.
31 // It will be destroyed when this actor leaves the loop, ie before the receiver gets the data
32 auto* payload = new std::string(msg_content);
34 /* Create a control message and put it in the message queue */
35 sg4::MessPtr mess = mqueue->put_async(payload);
36 XBT_INFO("Send '%s' to '%s'", msg_content.c_str(), mqueue->get_cname());
40 /* Send message to let the receiver know that it should stop */
41 XBT_INFO("Send 'finalize' to 'receiver'");
42 mqueue->put(new std::string("finalize"), 0);
45 /* Receiver actor expects 1 argument: its ID */
46 static void receiver()
48 sg4::MessageQueue* mqueue = sg4::MessageQueue::by_name("control");
50 sg4::this_actor::sleep_for(1);
52 XBT_INFO("Wait for my first message");
53 for (bool cont = true; cont;) {
54 std::string* received;
55 sg4::MessPtr mess = mqueue->get_async<std::string>(&received);
57 sg4::this_actor::sleep_for(0.1);
60 XBT_INFO("I got a '%s'.", received->c_str());
61 if (*received == "finalize")
62 cont = false; // If it's a finalize message, we're done.
67 int main(int argc, char* argv[])
69 sg4::Engine e(&argc, argv);
71 e.load_platform(argv[1]);
73 sg4::Actor::create("sender", e.host_by_name("Tremblay"), sender, 3);
74 sg4::Actor::create("receiver", e.host_by_name("Fafard"), receiver);