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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. */
/* In C, there is a single way of being informed when an actor exits.
*
* The sg_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 sg_actor_on_exit() are in charge
* of releasing any memory allocated by the actor during its execution.
*/
#include <simgrid/actor.h>
#include <simgrid/engine.h>
#include <simgrid/host.h>
#include <simgrid/mailbox.h>
#include <xbt/asserts.h>
#include <xbt/log.h>
XBT_LOG_NEW_DEFAULT_CATEGORY(actor_exiting, "Messages specific for this example");
static void A_on_exit(int ignored1, void* ignored2)
{
XBT_INFO("I stop now");
}
static void actorA_fun(int argc, char* argv[])
{
// Register a lambda function to be executed once it stops
sg_actor_on_exit(&A_on_exit, NULL);
sg_actor_sleep_for(1);
}
static void actorB_fun(int argc, char* argv[])
{
sg_actor_sleep_for(2);
}
static void C_on_exit(int failed, void* ignored2)
{
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.");
}
static void actorC_fun(int argc, char* argv[])
{
// Register a lambda function to be executed once it stops
sg_actor_on_exit(&C_on_exit, NULL);
sg_actor_sleep_for(3);
XBT_INFO("And now, induce a deadlock by waiting for a message that will never come\n\n");
sg_mailbox_get(sg_mailbox_by_name("nobody"));
xbt_die("Receiving is not supposed to succeed when nobody is sending");
}
int main(int argc, char* argv[])
{
simgrid_init(&argc, argv);
xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s ../platforms/small_platform.xml\n", argv[0], argv[0]);
simgrid_load_platform(argv[1]); /* - Load the platform description */
sg_actor_create("A", sg_host_by_name("Tremblay"), &actorA_fun, 0, NULL);
sg_actor_create("B", sg_host_by_name("Fafard"), &actorB_fun, 0, NULL);
sg_actor_create("C", sg_host_by_name("Ginette"), &actorC_fun, 0, NULL);
simgrid_run();
return 0;
}
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