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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. */
/******************** Non-deterministic message ordering *********************/
/* Server assumes a fixed order in the reception of messages from its clients */
/* which is incorrect because the message ordering is non-deterministic */
/******************************************************************************/
#include <simgrid/modelchecker.h>
#include <simgrid/s4u.hpp>
XBT_LOG_NEW_DEFAULT_CATEGORY(mc_assert_example, "Logging channel used in this example");
namespace sg4 = simgrid::s4u;
static int server(int worker_amount)
{
int value_got = -1;
sg4::Mailbox* mb = sg4::Mailbox::by_name("server");
for (int count = 0; count < worker_amount; count++) {
auto msg = mb->get_unique<int>();
value_got = *msg;
}
/*
* We assert here that the last message we got (which overwrite any previously received message) is the one from the
* last worker This will obviously fail when the messages are received out of order.
*/
MC_assert(value_got == 2);
XBT_INFO("OK");
return 0;
}
static int client(int rank)
{
/* I just send my rank onto the mailbox. It must be passed as a stable memory block (thus the new) so that that
* memory survives even after the end of the client */
sg4::Mailbox* mailbox = sg4::Mailbox::by_name("server");
mailbox->put(new int(rank), 1 /* communication cost is not really relevant in MC mode */);
XBT_INFO("Sent!");
return 0;
}
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
xbt_assert(argc > 1, "Usage: %s platform_file\n", argv[0]);
e.load_platform(argv[1]);
auto hosts = e.get_all_hosts();
xbt_assert(hosts.size() >= 3, "This example requires at least 3 hosts");
e.add_actor("server", hosts[0], &server, 2);
e.add_actor("client1", hosts[1], &client, 1);
e.add_actor("client2", hosts[2], &client, 2);
e.run();
return 0;
}
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