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/* Copyright (c) 2006-2025. 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. */
#include "simgrid/s4u.hpp" /* All of S4U */
#include "xbt/config.hpp"
#include <mutex> /* std::mutex and std::scoped_lock */
namespace sg4 = simgrid::s4u;
static simgrid::config::Flag<int> cfg_actor_count("actors", "How many pairs of actors should be started?", 6);
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_test, "a sample log category");
/* This worker uses a classical mutex */
static void worker(sg4::MutexPtr mutex, int& result)
{
// lock the mutex before enter in the critical section
mutex->lock();
XBT_INFO("Hello s4u, I'm ready to compute after a regular lock");
// And finally add it to the results
result += 1;
XBT_INFO("I'm done, good bye");
// You have to unlock the mutex if you locked it manually.
// Beware of exceptions preventing your unlock() from being executed!
mutex->unlock();
}
static void workerScopedLock(sg4::MutexPtr mutex, int& result)
{
// Simply use the std::scoped_lock like this
// It's like a lock() that would do the unlock() automatically when getting out of scope
const std::scoped_lock lock(*mutex);
// then you are in a safe zone
XBT_INFO("Hello s4u, I'm ready to compute after a scoped_lock");
// update the results
result += 1;
XBT_INFO("I'm done, good bye");
// Nothing specific here: the unlock will be automatic
}
int main(int argc, char** argv)
{
sg4::Engine e(&argc, argv);
e.load_platform(argc > 1 ? argv[1] : "../../platforms/two_hosts.xml");
/* Create the requested amount of actors pairs. Each pair has a specific mutex and cell in `result`. */
std::vector<int> result(cfg_actor_count.get());
for (int i = 0; i < cfg_actor_count; i++) {
sg4::MutexPtr mutex = sg4::Mutex::create();
e.add_actor("worker", sg4::Host::by_name("Jupiter"), workerScopedLock, mutex, std::ref(result[i]));
e.add_actor("worker", sg4::Host::by_name("Tremblay"), worker, mutex, std::ref(result[i]));
}
e.run();
for (int i = 0; i < cfg_actor_count; i++)
XBT_INFO("Result[%d] -> %d", i, result[i]);
return 0;
}
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