1 /* Copyright (c) 2007-2022. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include <simgrid/Exception.hpp>
7 #include <simgrid/s4u/Actor.hpp>
8 #include <simgrid/s4u/Host.hpp>
10 #define SIMIX_H_NO_DEPRECATED_WARNING // avoid deprecation warning on include (remove with XBT_ATTRIB_DEPRECATED_v333)
11 #include <simgrid/simix.h>
13 #include "src/kernel/EngineImpl.hpp"
15 #include "src/smpi/include/private.hpp"
17 #include "src/surf/HostImpl.hpp"
19 #include <boost/core/demangle.hpp>
23 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ker_actor, kernel, "Logging specific to Actor's kernel side");
26 * @brief Returns the current agent.
28 * This functions returns the currently running SIMIX process.
30 * @return The SIMIX process
32 simgrid::kernel::actor::ActorImpl* SIMIX_process_self() // XBT_ATTRIB_DEPRECATED_v333
34 return simgrid::kernel::actor::ActorImpl::self();
41 /*------------------------- [ ActorIDTrait ] -------------------------*/
42 static unsigned long maxpid = 0;
43 unsigned long get_maxpid()
47 unsigned long* get_maxpid_addr()
51 ActorIDTrait::ActorIDTrait(std::string name, aid_t ppid) : name_(std::move(name)), pid_(maxpid++), ppid_(ppid) {}
53 ActorImpl* ActorImpl::self()
55 const context::Context* self_context = context::Context::self();
57 return (self_context != nullptr) ? self_context->get_actor() : nullptr;
60 ActorImpl::ActorImpl(xbt::string name, s4u::Host* host, aid_t ppid)
61 : ActorIDTrait(std::move(name), ppid), host_(host), piface_(this)
63 simcall_.issuer_ = this;
64 stacksize_ = context::stack_size;
67 ActorImpl::~ActorImpl()
69 if (EngineImpl::has_instance() && not EngineImpl::get_instance()->is_maestro(this))
70 s4u::Actor::on_destruction(*get_ciface());
73 /* Become an actor in the simulation
75 * Currently this can only be called by the main thread (once) and only work with some thread factories
76 * (currently ThreadContextFactory).
78 * In the future, it might be extended in order to attach other threads created by a third party library.
81 ActorImplPtr ActorImpl::attach(const std::string& name, void* data, s4u::Host* host)
83 // This is mostly a copy/paste from create(), it'd be nice to share some code between those two functions.
84 auto* engine = EngineImpl::get_instance();
85 XBT_DEBUG("Attach actor %s on host '%s'", name.c_str(), host->get_cname());
87 if (not host->is_on()) {
88 XBT_WARN("Cannot attach actor '%s' on failed host '%s'", name.c_str(), host->get_cname());
89 throw HostFailureException(XBT_THROW_POINT, "Cannot attach actor on failed host.");
92 auto* actor = new ActorImpl(xbt::string(name), host, /*ppid*/ -1);
94 actor->piface_.set_data(data);
95 actor->code_ = nullptr;
97 XBT_VERB("Create context %s", actor->get_cname());
98 actor->context_.reset(engine->get_context_factory()->attach(actor));
100 /* Add the actor to it's host actor list */
101 host->get_impl()->add_actor(actor);
103 /* Now insert it in the global actor list and in the actors to run list */
104 engine->add_actor(actor->get_pid(), actor);
105 engine->add_actor_to_run_list_no_check(actor);
106 intrusive_ptr_add_ref(actor);
108 auto* context = dynamic_cast<context::AttachContext*>(actor->context_.get());
109 xbt_assert(nullptr != context, "Not a suitable context");
110 context->attach_start();
112 /* The on_creation() signal must be delayed until there, where the pid and everything is set */
113 s4u::Actor::on_creation(*actor->get_ciface());
115 return ActorImplPtr(actor);
117 /** @brief Detach an actor attached with `attach()`
119 * This is called when the current actor has finished its job.
120 * Used in the main thread, it waits for the simulation to finish before returning. When it returns, the other
121 * simulated actors and the maestro are destroyed.
123 void ActorImpl::detach()
125 auto* context = dynamic_cast<context::AttachContext*>(context::Context::self());
126 xbt_assert(context != nullptr, "Not a suitable context");
128 context->get_actor()->cleanup_from_self();
129 context->attach_stop();
132 /** Whether this actor is actually maestro */
133 bool ActorImpl::is_maestro() const
135 return context_->is_maestro();
138 void ActorImpl::cleanup_from_kernel()
140 xbt_assert(s4u::Actor::is_maestro(), "Cleanup_from_kernel must be called in maestro context");
142 auto* engine = EngineImpl::get_instance();
143 if (engine->get_actor_by_pid(get_pid()) == nullptr)
144 return; // Already cleaned
146 engine->remove_actor(get_pid());
147 if (host_ && host_actor_list_hook.is_linked())
148 host_->get_impl()->remove_actor(this);
149 if (not kernel_destroy_list_hook.is_linked())
150 engine->add_actor_to_destroy_list(*this);
152 if (has_to_auto_restart() && not get_host()->is_on()) {
153 XBT_DEBUG("Insert host %s to watched_hosts because it's off and %s needs to restart", get_host()->get_cname(),
155 watched_hosts().insert(get_host()->get_name());
159 s4u::Actor::on_termination(*get_ciface());
161 while (not mailboxes_.empty())
162 mailboxes_.back()->set_receiver(nullptr);
165 /* Do all the cleanups from the actor context. Warning, the simcall mechanism was not reignited so doing simcalls in
166 * this context is dangerous */
167 void ActorImpl::cleanup_from_self()
169 xbt_assert(not ActorImpl::is_maestro(), "Cleanup_from_self called from maestro on '%s'", get_cname());
173 // Execute the termination callbacks
174 bool failed = wannadie();
175 for (auto exit_fun = on_exit->crbegin(); exit_fun != on_exit->crend(); ++exit_fun)
180 /* cancel non-blocking activities */
181 for (auto activity : activities_)
185 XBT_DEBUG("%s@%s(%ld) should not run anymore", get_cname(), get_host()->get_cname(), get_pid());
187 /* Unregister associated timers if any */
188 if (kill_timer_ != nullptr) {
189 kill_timer_->remove();
190 kill_timer_ = nullptr;
192 if (simcall_.timeout_cb_) {
193 simcall_.timeout_cb_->remove();
194 simcall_.timeout_cb_ = nullptr;
197 /* maybe the actor was killed during a simcall, reset its observer */
198 simcall_.observer_ = nullptr;
203 void ActorImpl::exit()
207 exception_ = nullptr;
209 if (waiting_synchro_ != nullptr) {
210 /* Take an extra reference on the activity object that may be unref by Comm::finish() or friends */
211 activity::ActivityImplPtr activity = waiting_synchro_;
213 activity->set_state(activity::State::FAILED);
216 activities_.remove(waiting_synchro_);
217 waiting_synchro_ = nullptr;
219 for (auto const& activity : activities_)
223 // Forcefully kill the actor if its host is turned off. Not a HostFailureException because you should not survive that
224 this->throw_exception(std::make_exception_ptr(ForcefulKillException(host_->is_on() ? "exited" : "host failed")));
227 void ActorImpl::kill(ActorImpl* actor) const
229 xbt_assert(not actor->is_maestro(), "Killing maestro is a rather bad idea.");
230 if (actor->wannadie()) {
231 XBT_DEBUG("Ignoring request to kill actor %s@%s that is already dead", actor->get_cname(),
232 actor->host_->get_cname());
236 XBT_DEBUG("Actor '%s'@%s is killing actor '%s'@%s", get_cname(), host_ ? host_->get_cname() : "", actor->get_cname(),
237 actor->host_ ? actor->host_->get_cname() : "");
242 XBT_DEBUG("Go on, this is a suicide,");
244 EngineImpl::get_instance()->add_actor_to_run_list(actor);
247 void ActorImpl::kill_all() const
249 for (auto const& kv : EngineImpl::get_instance()->get_actor_list())
250 if (kv.second != this)
251 this->kill(kv.second);
254 void ActorImpl::set_kill_time(double kill_time)
256 if (kill_time <= s4u::Engine::get_clock())
258 XBT_DEBUG("Set kill time %f for actor %s@%s", kill_time, get_cname(), host_->get_cname());
259 kill_timer_ = timer::Timer::set(kill_time, [this] {
261 kill_timer_ = nullptr;
262 EngineImpl::get_instance()->add_actor_to_run_list(this);
266 double ActorImpl::get_kill_time() const
268 return kill_timer_ ? kill_timer_->get_date() : 0.0;
271 void ActorImpl::yield()
273 XBT_DEBUG("Yield actor '%s'", get_cname());
275 /* Go into sleep and return control to maestro */
277 /* Ok, maestro returned control to us */
278 XBT_DEBUG("Control returned to me: '%s'", get_cname());
281 XBT_DEBUG("Actor %s@%s is dead", get_cname(), host_->get_cname());
287 XBT_DEBUG("Hey! I'm suspended.");
288 xbt_assert(exception_ == nullptr, "Gasp! This exception may be lost by subsequent calls.");
289 yield(); // Yield back to maestro without proceeding with my execution. I'll get rescheduled by resume()
292 if (exception_ != nullptr) {
293 XBT_DEBUG("Wait, maestro left me an exception");
294 std::exception_ptr exception = std::move(exception_);
295 exception_ = nullptr;
297 std::rethrow_exception(std::move(exception));
298 } catch (const simgrid::Exception& e) {
299 e.rethrow_nested(XBT_THROW_POINT, boost::core::demangle(typeid(e).name()) + " raised in kernel mode.");
304 smpi_switch_data_segment(get_iface());
308 /** This actor will be terminated automatically when the last non-daemon actor finishes */
309 void ActorImpl::daemonize()
313 EngineImpl::get_instance()->add_daemon(this);
317 void ActorImpl::undaemonize()
321 EngineImpl::get_instance()->remove_daemon(this);
325 s4u::Actor* ActorImpl::restart()
327 xbt_assert(not this->is_maestro(), "Restarting maestro is not supported");
329 XBT_DEBUG("Restarting actor %s on %s", get_cname(), host_->get_cname());
331 // retrieve the arguments of the old actor
332 ProcessArg args(host_, this);
334 // kill the old actor
335 context::Context::self()->get_actor()->kill(this);
337 // start the new actor
338 return create(&args)->get_ciface();
341 void ActorImpl::suspend()
344 XBT_DEBUG("Actor '%s' is already suspended", get_cname());
350 /* Suspend the activities associated with this actor. */
351 for (auto const& activity : activities_)
355 void ActorImpl::resume()
357 XBT_IN("actor = %p", this);
360 XBT_VERB("Ignoring request to resume an actor that is currently dying.");
368 /* resume the activities that were blocked when suspending the actor. */
369 for (auto const& activity : activities_)
371 if (not waiting_synchro_) // Reschedule the actor if it was forcefully unscheduled in yield()
372 EngineImpl::get_instance()->add_actor_to_run_list_no_check(this);
377 activity::ActivityImplPtr ActorImpl::join(const ActorImpl* actor, double timeout)
379 activity::ActivityImplPtr sleep = this->sleep(timeout);
380 if (actor->wannadie() || actor->to_be_freed()) {
381 if (sleep->surf_action_)
382 sleep->surf_action_->finish(resource::Action::State::FINISHED);
384 actor->on_exit->emplace_back([sleep](bool) {
385 if (sleep->surf_action_)
386 sleep->surf_action_->finish(resource::Action::State::FINISHED);
392 activity::ActivityImplPtr ActorImpl::sleep(double duration)
394 if (not host_->is_on())
395 throw_exception(std::make_exception_ptr(HostFailureException(
396 XBT_THROW_POINT, std::string("Host ") + host_->get_cname() + " failed, you cannot sleep there.")));
398 auto sleep = new activity::SleepImpl();
399 sleep->set_name("sleep").set_host(host_).set_duration(duration).start();
400 return activity::SleepImplPtr(sleep);
403 void ActorImpl::throw_exception(std::exception_ptr e)
410 /* cancel the blocking synchro if any */
411 if (waiting_synchro_) {
412 waiting_synchro_->cancel();
413 activities_.remove(waiting_synchro_);
414 waiting_synchro_ = nullptr;
418 void ActorImpl::simcall_answer()
420 auto* engine = EngineImpl::get_instance();
421 if (not this->is_maestro()) {
422 XBT_DEBUG("Answer simcall %s issued by %s (%p)", simcall_.get_cname(), get_cname(), this);
423 xbt_assert(simcall_.call_ != Simcall::Type::NONE);
424 simcall_.call_ = Simcall::Type::NONE;
425 const auto& actors_to_run = engine->get_actors_to_run();
426 xbt_assert(not XBT_LOG_ISENABLED(ker_actor, xbt_log_priority_debug) ||
427 std::find(begin(actors_to_run), end(actors_to_run), this) == end(actors_to_run),
428 "Actor %p should not exist in actors_to_run!", this);
429 engine->add_actor_to_run_list_no_check(this);
433 void ActorImpl::set_host(s4u::Host* dest)
435 host_->get_impl()->remove_actor(this);
437 dest->get_impl()->add_actor(this);
440 ActorImplPtr ActorImpl::init(const std::string& name, s4u::Host* host) const
442 auto* actor = new ActorImpl(xbt::string(name), host, get_pid());
444 intrusive_ptr_add_ref(actor);
445 /* The on_creation() signal must be delayed until there, where the pid and everything is set */
446 s4u::Actor::on_creation(*actor->get_ciface());
448 return ActorImplPtr(actor);
451 ActorImpl* ActorImpl::start(const ActorCode& code)
453 xbt_assert(code && host_ != nullptr, "Invalid parameters");
454 auto* engine = EngineImpl::get_instance();
456 if (not host_->is_on()) {
457 XBT_WARN("Cannot launch actor '%s' on failed host '%s'", get_cname(), host_->get_cname());
458 intrusive_ptr_release(this);
459 throw HostFailureException(XBT_THROW_POINT, "Cannot start actor on failed host.");
463 XBT_VERB("Create context %s", get_cname());
464 context_.reset(engine->get_context_factory()->create_context(ActorCode(code), this));
466 XBT_DEBUG("Start context '%s'", get_cname());
468 /* Add the actor to its host's actor list */
469 host_->get_impl()->add_actor(this);
470 engine->add_actor(get_pid(), this);
472 /* Now insert it in the global actor list and in the actor to run list */
473 engine->add_actor_to_run_list_no_check(this);
478 ActorImplPtr ActorImpl::create(const std::string& name, const ActorCode& code, void* data, s4u::Host* host,
479 const ActorImpl* parent_actor)
481 XBT_DEBUG("Start actor %s@'%s'", name.c_str(), host->get_cname());
484 if (parent_actor != nullptr)
485 actor = parent_actor->init(xbt::string(name), host);
487 actor = self()->init(xbt::string(name), host);
489 actor->piface_.set_data(data); /* actor data */
495 ActorImplPtr ActorImpl::create(ProcessArg* args)
497 ActorImplPtr actor = ActorImpl::create(args->name, args->code, nullptr, args->host, nullptr);
498 actor->restart_count_ = args->restart_count_;
499 actor->set_properties(args->properties);
501 *actor->on_exit = *args->on_exit;
502 if (args->kill_time >= 0)
503 actor->set_kill_time(args->kill_time);
504 if (args->auto_restart)
505 actor->set_auto_restart(args->auto_restart);
510 void ActorImpl::set_wannadie(bool value)
512 XBT_DEBUG("Actor %s gonna die.", get_cname());
516 void create_maestro(const std::function<void()>& code)
518 auto* engine = EngineImpl::get_instance();
519 /* Create maestro actor and initialize it */
520 auto* maestro = new ActorImpl(xbt::string(""), /*host*/ nullptr, /*ppid*/ -1);
523 maestro->context_.reset(engine->get_context_factory()->create_context(ActorCode(), maestro));
525 maestro->context_.reset(engine->get_context_factory()->create_maestro(ActorCode(code), maestro));
528 maestro->simcall_.issuer_ = maestro;
529 engine->set_maestro(maestro);
533 } // namespace kernel
534 } // namespace simgrid
536 /* needs to be public and without simcall because it is called by exceptions and logging events */
537 const char* SIMIX_process_self_get_name() // XBT_ATTRIB_DEPRECATED_v333
539 return simgrid::s4u::Actor::is_maestro() ? "maestro" : simgrid::kernel::actor::ActorImpl::self()->get_cname();
542 int SIMIX_is_maestro() // XBT_ATTRIB_DEPRECATED_v333
544 const auto* self = simgrid::kernel::actor::ActorImpl::self();
545 return self != nullptr && self->is_maestro();