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/* Copyright (c) 2017-2025. 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 demonstrate basic use of tasks.
*
* We model the following graph:
*
* exec1 -> comm -> exec2
*
* exec1 and exec2 are execution tasks.
* comm is a communication task.
*/
#include "simgrid/s4u.hpp"
#include "simgrid/s4u/Task.hpp"
#include <simgrid/plugins/file_system.h>
XBT_LOG_NEW_DEFAULT_CATEGORY(task_simple, "Messages specific for this task example");
namespace sg4 = simgrid::s4u;
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
e.load_platform(argv[1]);
// Retrieve hosts
auto* bob = e.host_by_name("bob");
auto* carl = e.host_by_name("carl");
// Create tasks
auto exec1 = sg4::ExecTask::init("exec1", 1e9, bob);
auto exec2 = sg4::ExecTask::init("exec2", 1e9, carl);
auto write = sg4::IoTask::init("write", 1e7, bob->get_disks().front(), sg4::Io::OpType::WRITE);
auto read = sg4::IoTask::init("read", 1e7, carl->get_disks().front(), sg4::Io::OpType::READ);
// Create the graph by defining dependencies between tasks
exec1->add_successor(write);
write->add_successor(read);
read->add_successor(exec2);
// Add a function to be called when tasks end for log purpose
sg4::Task::on_completion_cb(
[](const sg4::Task* t) { XBT_INFO("Task %s finished (%d)", t->get_name().c_str(), t->get_count()); });
// Enqueue two firings for task exec1
exec1->enqueue_firings(2);
// Start the simulation
e.run();
return 0;
}
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