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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. */
/* There is two very different ways of being informed when an actor exits.
*
* The this_actor::on_exit() function allows one to register a function to be
* executed when this very actor exits. The registered function will run
* when this actor terminates (either because its main function returns, or
* because it's killed in any way). No simcall are allowed here: your actor
* is dead already, so it cannot interact with its environment in any way
* (network, executions, disks, etc).
*
* Usually, the functions registered in this_actor::on_exit() are in charge
* of releasing any memory allocated by the actor during its execution.
*
* The other way of getting informed when an actor terminates is to connect a
* function in the Actor::on_termination signal, that is shared between
* all actors. Callbacks to this signal are executed for each terminating
* actors, no matter what. This is useful in many cases, in particular
* when developing SimGrid plugins.
*
* Finally, you can attach callbacks to the Actor::on_destruction signal.
* It is also shared between all actors, and gets fired when the actors
* are destroyed. A delay is possible between the termination of an actor
* (ie, when it terminates executing its code) and its destruction (ie,
* when it is not referenced anywhere in the simulation and can be collected).
*
* In both cases, you can stack more than one callback in the signal.
* They will all be executed in the registration order.
*/
#include <simgrid/s4u.hpp>
namespace sg4 = simgrid::s4u;
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_actor_exiting, "Messages specific for this s4u example");
static void actor_a()
{
// Register a lambda function to be executed once it stops
sg4::this_actor::on_exit([](bool /*failed*/) { XBT_INFO("I stop now"); });
sg4::this_actor::sleep_for(1);
}
static void actor_b()
{
sg4::this_actor::sleep_for(2);
}
static void actor_c()
{
// Register a lambda function to be executed once it stops
sg4::this_actor::on_exit([](bool failed) {
if (failed) {
XBT_INFO("I was killed!");
if (xbt_log_no_loc)
XBT_INFO("The backtrace would be displayed here if --log=no_loc would not have been passed");
else
xbt_backtrace_display_current();
} else
XBT_INFO("Exiting gracefully.");
});
sg4::this_actor::sleep_for(3);
XBT_INFO("And now, induce a deadlock by waiting for a message that will never come\n\n");
sg4::Mailbox::by_name("nobody")->get<void>();
xbt_die("Receiving is not supposed to succeed when nobody is sending");
}
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s ../platforms/small_platform.xml\n", argv[0], argv[0]);
e.load_platform(argv[1]); /* - Load the platform description */
/* Register a callback in the Actor::on_creation signal. It will be called for started actors */
sg4::Actor::on_creation_cb([](sg4::Actor const& actor) { XBT_INFO("Actor %s starts now", actor.get_cname()); });
/* Register a callback in the Actor::on_termination signal. It will be called for every terminated actors */
sg4::Actor::on_termination_cb(
[](sg4::Actor const& actor) { XBT_INFO("Actor %s terminates now", actor.get_cname()); });
/* Register a callback in the Actor::on_destruction signal. It will be called for every destructed actors */
sg4::Actor::on_destruction_cb(
[](sg4::Actor const& actor) { XBT_INFO("Actor %s gets destroyed now", actor.get_cname()); });
/* Create some actors */
e.host_by_name("Tremblay")->add_actor("A", actor_a);
e.host_by_name("Fafard")->add_actor("B", actor_b);
e.host_by_name("Ginette")->add_actor("C", actor_c);
e.run(); /* - Run the simulation */
return 0;
}
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