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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(example, "this example");
namespace sg4 = simgrid::s4u;
static void server()
{
auto received1 = sg4::Mailbox::by_name("mymailbox")->get_unique<int>();
long val1 = *received1;
auto received2 = sg4::Mailbox::by_name("mymailbox")->get_unique<int>();
long val2 = *received2;
XBT_INFO("First pair received: %ld %ld", val1, val2);
MC_assert(std::min(val1, val2) == 1); // if the two messages of the second client arrive first, this is violated.
received1 = sg4::Mailbox::by_name("mymailbox")->get_unique<int>();
val1 = *received1;
received2 = sg4::Mailbox::by_name("mymailbox")->get_unique<int>();
val2 = *received2;
XBT_INFO("Second pair received: %ld %ld", val1, val2);
}
static void client(int id)
{
auto* payload1 = new int(id);
auto* payload2 = new int(id);
sg4::Mailbox::by_name("mymailbox")->put(payload1, 10000);
sg4::Mailbox::by_name("mymailbox")->put(payload2, 10000);
}
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
e.load_platform(argv[1]);
e.add_actor("server", e.host_by_name("HostA"), server);
e.add_actor("client", e.host_by_name("HostB"), client, 1);
e.add_actor("client", e.host_by_name("HostC"), client, 2);
e.run();
return 0;
}
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