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/* Copyright (c) 2023-2025. 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 example shows how to use simgrid::s4u::this_actor::wait() to wait for a given communication.
*
* As for the other asynchronous examples, the sender initiate all the messages it wants to send and
* pack the resulting simgrid::s4u::CommPtr objects in a vector. All messages thus occurs concurrently.
*
* The sender then loops until there is no ongoing communication.
*/
#include "simgrid/s4u.hpp"
#include <cstdlib>
#include <iostream>
#include <string>
namespace sg4 = simgrid::s4u;
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_mess_wait, "Messages specific for this s4u example");
static void sender(int messages_count)
{
sg4::MessageQueue* mqueue = sg4::MessageQueue::by_name("control");
sg4::this_actor::sleep_for(0.5);
XBT_INFO("Send 'hello' to 'receiver'");
mqueue->put(new std::string("hello"));
for (int i = 0; i < messages_count; i++) {
std::string msg_content = "Message " + std::to_string(i);
// Copy the data we send: the 'msg_content' variable is not a stable storage location.
// It will be destroyed when this actor leaves the loop, ie before the receiver gets the data
auto* payload = new std::string(msg_content);
/* Create a control message and put it in the message queue */
sg4::MessPtr mess = mqueue->put_async(payload);
XBT_INFO("Send '%s' to '%s'", msg_content.c_str(), mqueue->get_cname());
mess->wait();
}
/* Send message to let the receiver know that it should stop */
XBT_INFO("Send 'finalize' to 'receiver'");
mqueue->put(new std::string("finalize"));
}
/* Receiver actor expects 1 argument: its ID */
static void receiver()
{
sg4::MessageQueue* mqueue = sg4::MessageQueue::by_name("control");
sg4::this_actor::sleep_for(1);
// Messages can be received without providing a destination buffer. In that case, you can retrieve the payload
// once the Mess is over by calling the get_payload() function.
sg4::MessPtr hello = mqueue->get_async();
hello->wait();
auto* msg = static_cast<std::string*>(hello->get_payload());
XBT_INFO("I got a '%s'.", msg->c_str());
delete msg;
XBT_INFO("Wait for my first message");
for (bool cont = true; cont;) {
std::string* received;
sg4::MessPtr mess = mqueue->get_async<std::string>(&received);
sg4::this_actor::sleep_for(0.1);
mess->wait();
XBT_INFO("I got a '%s'.", received->c_str());
if (*received == "finalize")
cont = false; // If it's a finalize message, we're done.
delete received;
}
}
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
e.load_platform(argv[1]);
e.host_by_name("Tremblay")->add_actor("sender", sender, 3);
e.host_by_name("Fafard")->add_actor("receiver", receiver);
e.run();
return 0;
}
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