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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 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_comm_wait, "Messages specific for this s4u example");
static void sender(int messages_count, size_t payload_size)
{
double sleep_start_time = 5.0;
double sleep_test_time = 0;
sg4::Mailbox* mbox = sg4::Mailbox::by_name("receiver");
XBT_INFO("sleep_start_time : %f , sleep_test_time : %f", sleep_start_time, sleep_test_time);
sg4::this_actor::sleep_for(sleep_start_time);
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 communication representing the ongoing communication and then */
sg4::CommPtr comm = mbox->put_async(payload, payload_size);
XBT_INFO("Send '%s' to '%s'", msg_content.c_str(), mbox->get_cname());
if (sleep_test_time > 0) { /* - "test_time" is set to 0, wait */
while (not comm->test()) { /* - Call test() every "sleep_test_time" otherwise */
sg4::this_actor::sleep_for(sleep_test_time);
}
} else {
comm->wait();
}
}
/* Send message to let the receiver know that it should stop */
XBT_INFO("Send 'finalize' to 'receiver'");
mbox->put(new std::string("finalize"), 0);
}
/* Receiver actor expects no argument */
static void receiver()
{
double sleep_start_time = 1.0;
double sleep_test_time = 0.1;
sg4::Mailbox* mbox = sg4::Mailbox::by_name("receiver");
XBT_INFO("sleep_start_time : %f , sleep_test_time : %f", sleep_start_time, sleep_test_time);
sg4::this_actor::sleep_for(sleep_start_time);
XBT_INFO("Wait for my first message");
for (bool cont = true; cont;) {
std::string* received;
sg4::CommPtr comm = mbox->get_async<std::string>(&received);
if (sleep_test_time > 0) { /* - "test_time" is set to 0, wait */
while (not comm->test()) { /* - Call test() every "sleep_test_time" otherwise */
sg4::this_actor::sleep_for(sleep_test_time);
}
} else {
comm->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.add_actor("sender", e.host_by_name("Tremblay"), sender, 3, 482117300);
e.add_actor("receiver", e.host_by_name("Ruby"), receiver);
e.run();
return 0;
}
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