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/* Copyright (c) 2010-2025. 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 suspend and resume an asynchronous communication. */
#include "simgrid/s4u.hpp"
#include <cstdlib>
#include <iostream>
#include <string>
namespace sg4 = simgrid::s4u;
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_comm_wait, "Messages specific for this s4u example");
static void sender()
{
sg4::Mailbox* mbox = sg4::Mailbox::by_name("receiver");
// 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("Sent message");
/* Create a communication representing the ongoing communication and then */
sg4::CommPtr comm = mbox->put_init(payload, 13194230);
XBT_INFO("Suspend the communication before it starts (remaining: %.0f bytes) and wait a second.",
comm->get_remaining());
sg4::this_actor::sleep_for(1);
XBT_INFO("Now, start the communication (remaining: %.0f bytes) and wait another second.", comm->get_remaining());
comm->start();
sg4::this_actor::sleep_for(1);
XBT_INFO("There is still %.0f bytes to transfer in this communication. Suspend it for one second.",
comm->get_remaining());
comm->suspend();
XBT_INFO("Now there is %.0f bytes to transfer. Resume it and wait for its completion.", comm->get_remaining());
comm->resume();
comm->wait();
XBT_INFO("There is %f bytes to transfer after the communication completion.", comm->get_remaining());
XBT_INFO("Suspending a completed activity is a no-op.");
comm->suspend();
}
static void receiver()
{
sg4::Mailbox* mbox = sg4::Mailbox::by_name("receiver");
XBT_INFO("Wait for the message.");
auto received = mbox->get_unique<std::string>();
XBT_INFO("I got '%s'.", received->c_str());
}
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);
e.host_by_name("Jupiter")->add_actor("receiver",receiver);
e.run();
return 0;
}
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