-/* Copyright (c) 2007-2020. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2007-2021. 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. */
/** @addtogroup S4U_examples
*
* - <b>maestro-set/maestro-set.cpp: Switch the system thread hosting our maestro</b>.
- * That's a very advanced example in which we move the maestro thread to another process.
+ * That's a very advanced example in which we move the maestro context to another system thread.
* Not many users need it (maybe only one, actually), but this example is also a regression test.
*
* This example is in C++ because we use C++11 threads to ensure that the feature is working as
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_test, "Messages specific for this s4u example");
-std::thread::id root_id;
+const std::thread::id root_id = std::this_thread::get_id();
static void ensure_root_tid()
{
static void sender()
{
ensure_root_tid();
- std::string* payload = new std::string("some message");
- simgrid::s4u::Mailbox::by_name("some mailbox")->put((void*)payload, 10e8);
+ auto* payload = new std::string("some message");
+ simgrid::s4u::Mailbox::by_name("some mailbox")->put(payload, 10e8);
}
static void receiver()
{
ensure_other_tid();
- const std::string* payload = static_cast<std::string*>(simgrid::s4u::Mailbox::by_name("some mailbox")->get());
+ simgrid::s4u::Mailbox::by_name("some mailbox")->get_unique<std::string>();
XBT_INFO("Task received");
- delete payload;
}
static void maestro(void* /* data */)
/** Main function */
int main(int argc, char* argv[])
{
- root_id = std::this_thread::get_id();
+ /* Specify which code should be executed by maestro on another thread, once this current thread is affected to an
+ * actor by the subsequent sg_actor_attach(). This must be done before the creation of the engine. */
+ SIMIX_set_maestro(maestro, nullptr);
- SIMIX_set_maestro(maestro, NULL);
simgrid::s4u::Engine e(&argc, argv);
if (argc != 2) {
e.load_platform(argv[1]);
- /* Become one of the simulated process.
- *
- * This must be done after the creation of the platform because we are depending attaching to a host.*/
+ /* Become one of the simulated process (must be done after the platform creation, or the host won't exist). */
sg_actor_attach("sender", nullptr, simgrid::s4u::Host::by_name("Tremblay"), nullptr);
- ensure_root_tid();
- // Execute the sender code:
+ ensure_root_tid(); // Only useful in this test: we ensure that simgrid is not broken and that this code is executed in
+ // the correct system thread
+
+ // Execute the sender code. The root thread was actually turned into a regular actor
sender();
- sg_actor_detach(); // Become root thread again
+ sg_actor_detach(); // The root thread becomes maestro again (as proved by the output)
XBT_INFO("Detached");
ensure_root_tid();