1 /* Copyright (c) 2007-2021. 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/s4u/Actor.hpp"
8 #include "simgrid/Exception.hpp"
9 #include "simgrid/s4u/Exec.hpp"
10 #include "src/kernel/EngineImpl.hpp"
11 #include "src/kernel/activity/CommImpl.hpp"
12 #include "src/kernel/activity/ExecImpl.hpp"
13 #include "src/kernel/activity/IoImpl.hpp"
14 #include "src/kernel/activity/SleepImpl.hpp"
15 #include "src/kernel/activity/SynchroRaw.hpp"
16 #include "src/mc/mc_replay.hpp"
17 #include "src/mc/remote/AppSide.hpp"
19 #include "src/smpi/include/private.hpp"
21 #include "src/surf/HostImpl.hpp"
22 #include "src/surf/cpu_interface.hpp"
24 #include <boost/core/demangle.hpp>
28 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix, "Logging specific to SIMIX (process)");
31 * @brief Returns the current agent.
33 * This functions returns the currently running SIMIX process.
35 * @return The SIMIX process
37 smx_actor_t SIMIX_process_self()
39 return simgrid::kernel::actor::ActorImpl::self();
46 static unsigned long maxpid = 0;
47 unsigned long get_maxpid()
51 unsigned long* get_maxpid_addr()
55 ActorImpl* ActorImpl::by_pid(aid_t pid)
57 return EngineImpl::get_instance()->get_actor_by_pid(pid);
60 ActorImpl* ActorImpl::self()
62 const context::Context* self_context = context::Context::self();
64 return (self_context != nullptr) ? self_context->get_actor() : nullptr;
67 ActorImpl::ActorImpl(xbt::string name, s4u::Host* host) : host_(host), name_(std::move(name)), piface_(this)
70 simcall_.issuer_ = this;
71 stacksize_ = smx_context_stack_size;
74 ActorImpl::~ActorImpl()
76 if (EngineImpl::has_instance() && not EngineImpl::get_instance()->is_maestro(this))
77 s4u::Actor::on_destruction(*get_ciface());
80 /* Become an actor in the simulation
82 * Currently this can only be called by the main thread (once) and only work with some thread factories
83 * (currently ThreadContextFactory).
85 * In the future, it might be extended in order to attach other threads created by a third party library.
88 ActorImplPtr ActorImpl::attach(const std::string& name, void* data, s4u::Host* host)
90 // This is mostly a copy/paste from create(), it'd be nice to share some code between those two functions.
91 auto* engine = EngineImpl::get_instance();
92 XBT_DEBUG("Attach actor %s on host '%s'", name.c_str(), host->get_cname());
94 if (not host->is_on()) {
95 XBT_WARN("Cannot attach actor '%s' on failed host '%s'", name.c_str(), host->get_cname());
96 throw HostFailureException(XBT_THROW_POINT, "Cannot attach actor on failed host.");
99 auto* actor = new ActorImpl(xbt::string(name), host);
101 actor->piface_.set_data(data);
102 actor->code_ = nullptr;
104 XBT_VERB("Create context %s", actor->get_cname());
105 actor->context_.reset(engine->get_context_factory()->attach(actor));
107 /* Add the actor to it's host actor list */
108 host->get_impl()->add_actor(actor);
110 /* Now insert it in the global actor list and in the actors to run list */
111 engine->add_actor(actor->get_pid(), actor);
112 engine->add_actor_to_run_list_no_check(actor);
113 intrusive_ptr_add_ref(actor);
115 auto* context = dynamic_cast<context::AttachContext*>(actor->context_.get());
116 xbt_assert(nullptr != context, "Not a suitable context");
117 context->attach_start();
119 /* The on_creation() signal must be delayed until there, where the pid and everything is set */
120 s4u::Actor::on_creation(*actor->get_ciface());
122 return ActorImplPtr(actor);
124 /** @brief Detach an actor attached with `attach()`
126 * This is called when the current actor has finished its job.
127 * Used in the main thread, it waits for the simulation to finish before returning. When it returns, the other
128 * simulated actors and the maestro are destroyed.
130 void ActorImpl::detach()
132 auto* context = dynamic_cast<context::AttachContext*>(context::Context::self());
133 xbt_assert(context != nullptr, "Not a suitable context");
135 context->get_actor()->cleanup();
136 context->attach_stop();
139 void ActorImpl::cleanup_from_simix()
141 auto* engine = EngineImpl::get_instance();
142 const std::lock_guard<std::mutex> lock(engine->get_mutex());
143 engine->remove_actor(pid_);
144 if (host_ && host_actor_list_hook.is_linked())
145 host_->get_impl()->remove_actor(this);
146 if (not kernel_destroy_list_hook.is_linked()) {
148 engine->add_dead_actor_to_dynar(this);
150 engine->add_actor_to_destroy_list(*this);
154 void ActorImpl::cleanup()
158 if (has_to_auto_restart() && not get_host()->is_on()) {
159 XBT_DEBUG("Insert host %s to watched_hosts because it's off and %s needs to restart", get_host()->get_cname(),
161 watched_hosts().insert(get_host()->get_name());
165 // Execute the termination callbacks
166 bool failed = context_->wannadie();
167 for (auto exit_fun = on_exit->crbegin(); exit_fun != on_exit->crend(); ++exit_fun)
173 /* cancel non-blocking activities */
174 for (auto activity : activities_)
178 XBT_DEBUG("%s@%s(%ld) should not run anymore", get_cname(), get_host()->get_cname(), get_pid());
180 if (EngineImpl::get_instance()->is_maestro(this)) /* Do not cleanup maestro */
183 XBT_DEBUG("Cleanup actor %s (%p), waiting synchro %p", get_cname(), this, waiting_synchro_.get());
185 /* Unregister associated timers if any */
186 if (kill_timer_ != nullptr) {
187 kill_timer_->remove();
188 kill_timer_ = nullptr;
190 if (simcall_.timeout_cb_) {
191 simcall_.timeout_cb_->remove();
192 simcall_.timeout_cb_ = nullptr;
195 cleanup_from_simix();
197 context_->set_wannadie(false); // don't let the simcall's yield() do a Context::stop(), to avoid infinite loops
198 actor::simcall([this] { s4u::Actor::on_termination(*get_ciface()); });
199 context_->set_wannadie();
202 void ActorImpl::exit()
204 context_->set_wannadie();
206 exception_ = nullptr;
208 /* destroy the blocking synchro if any */
209 if (waiting_synchro_ != nullptr) {
210 waiting_synchro_->cancel();
211 waiting_synchro_->state_ = activity::State::FAILED;
213 activity::ExecImplPtr exec = boost::dynamic_pointer_cast<activity::ExecImpl>(waiting_synchro_);
214 activity::CommImplPtr comm = boost::dynamic_pointer_cast<activity::CommImpl>(waiting_synchro_);
216 if (exec != nullptr) {
217 exec->clean_action();
218 } else if (comm != nullptr) {
219 comm->unregister_simcall(&simcall_);
221 activity::ActivityImplPtr(waiting_synchro_)->finish();
224 activities_.remove(waiting_synchro_);
225 waiting_synchro_ = nullptr;
227 for (auto const& activity : activities_)
231 // Forcefully kill the actor if its host is turned off. Not a HostFailureException because you should not survive that
232 this->throw_exception(std::make_exception_ptr(ForcefulKillException(host_->is_on() ? "exited" : "host failed")));
235 void ActorImpl::kill(ActorImpl* actor) const
237 auto* engine = EngineImpl::get_instance();
238 xbt_assert(not engine->is_maestro(actor), "Killing maestro is a rather bad idea");
239 if (actor->finished_) {
240 XBT_DEBUG("Ignoring request to kill actor %s@%s that is already dead", actor->get_cname(),
241 actor->host_->get_cname());
245 XBT_DEBUG("Actor '%s'@%s is killing actor '%s'@%s", get_cname(), host_ ? host_->get_cname() : "", actor->get_cname(),
246 actor->host_ ? actor->host_->get_cname() : "");
251 XBT_DEBUG("Go on, this is a suicide,");
253 engine->add_actor_to_run_list(actor);
256 void ActorImpl::kill_all() const
258 for (auto const& kv : EngineImpl::get_instance()->get_actor_list())
259 if (kv.second != this)
260 this->kill(kv.second);
263 void ActorImpl::set_kill_time(double kill_time)
265 if (kill_time <= s4u::Engine::get_clock())
267 XBT_DEBUG("Set kill time %f for actor %s@%s", kill_time, get_cname(), host_->get_cname());
268 kill_timer_ = timer::Timer::set(kill_time, [this] {
270 kill_timer_ = nullptr;
274 double ActorImpl::get_kill_time() const
276 return kill_timer_ ? kill_timer_->get_date() : 0.0;
279 void ActorImpl::yield()
281 XBT_DEBUG("Yield actor '%s'", get_cname());
283 /* Go into sleep and return control to maestro */
286 /* Ok, maestro returned control to us */
287 XBT_DEBUG("Control returned to me: '%s'", get_cname());
289 if (context_->wannadie()) {
290 XBT_DEBUG("Actor %s@%s is dead", get_cname(), host_->get_cname());
296 XBT_DEBUG("Hey! I'm suspended.");
297 xbt_assert(exception_ == nullptr, "Gasp! This exception may be lost by subsequent calls.");
298 yield(); // Yield back to maestro without proceeding with my execution. I'll get rescheduled by resume()
301 if (exception_ != nullptr) {
302 XBT_DEBUG("Wait, maestro left me an exception");
303 std::exception_ptr exception = std::move(exception_);
304 exception_ = nullptr;
306 std::rethrow_exception(std::move(exception));
307 } catch (const simgrid::Exception& e) {
308 e.rethrow_nested(XBT_THROW_POINT, boost::core::demangle(typeid(e).name()) + " raised in kernel mode.");
314 smpi_switch_data_segment(get_iface());
318 /** This actor will be terminated automatically when the last non-daemon actor finishes */
319 void ActorImpl::daemonize()
323 EngineImpl::get_instance()->add_daemon(this);
327 void ActorImpl::undaemonize()
331 EngineImpl::get_instance()->remove_daemon(this);
335 s4u::Actor* ActorImpl::restart()
337 xbt_assert(not EngineImpl::get_instance()->is_maestro(this), "Restarting maestro is not supported");
339 XBT_DEBUG("Restarting actor %s on %s", get_cname(), host_->get_cname());
341 // retrieve the arguments of the old actor
342 ProcessArg arg(host_, this);
344 // kill the old actor
345 context::Context::self()->get_actor()->kill(this);
347 // start the new actor
348 ActorImplPtr actor = ActorImpl::create(arg.name, arg.code, arg.data, arg.host, nullptr);
349 actor->set_properties(arg.properties);
350 *actor->on_exit = std::move(*arg.on_exit);
351 actor->set_kill_time(arg.kill_time);
352 actor->set_auto_restart(arg.auto_restart);
354 return actor->get_ciface();
357 void ActorImpl::suspend()
360 XBT_DEBUG("Actor '%s' is already suspended", get_cname());
366 /* Suspend the activities associated with this actor. */
367 for (auto const& activity : activities_)
371 void ActorImpl::resume()
373 XBT_IN("actor = %p", this);
375 if (context_->wannadie()) {
376 XBT_VERB("Ignoring request to suspend an actor that is currently dying.");
384 /* resume the activities that were blocked when suspending the actor. */
385 for (auto const& activity : activities_)
387 if (not waiting_synchro_) // Reschedule the actor if it was forcefully unscheduled in yield()
388 EngineImpl::get_instance()->add_actor_to_run_list_no_check(this);
393 activity::ActivityImplPtr ActorImpl::join(const ActorImpl* actor, double timeout)
395 activity::ActivityImplPtr sleep = this->sleep(timeout);
396 actor->on_exit->emplace_back([sleep](bool) {
397 if (sleep->surf_action_)
398 sleep->surf_action_->finish(resource::Action::State::FINISHED);
403 activity::ActivityImplPtr ActorImpl::sleep(double duration)
405 if (not host_->is_on())
406 throw_exception(std::make_exception_ptr(HostFailureException(
407 XBT_THROW_POINT, std::string("Host ") + host_->get_cname() + " failed, you cannot sleep there.")));
409 auto sleep = new activity::SleepImpl();
410 sleep->set_name("sleep").set_host(host_).set_duration(duration).start();
411 return activity::SleepImplPtr(sleep);
414 void ActorImpl::throw_exception(std::exception_ptr e)
421 /* cancel the blocking synchro if any */
422 if (waiting_synchro_) {
423 waiting_synchro_->cancel();
424 activities_.remove(waiting_synchro_);
425 waiting_synchro_ = nullptr;
429 void ActorImpl::simcall_answer()
431 auto* engine = EngineImpl::get_instance();
432 if (not engine->is_maestro(this)) {
433 XBT_DEBUG("Answer simcall %s issued by %s (%p)", SIMIX_simcall_name(simcall_), get_cname(), this);
434 xbt_assert(simcall_.call_ != simix::Simcall::NONE);
435 simcall_.call_ = simix::Simcall::NONE;
436 const auto& actors_to_run = engine->get_actors_to_run();
437 xbt_assert(not XBT_LOG_ISENABLED(simix_process, xbt_log_priority_debug) ||
438 std::find(begin(actors_to_run), end(actors_to_run), this) == end(actors_to_run),
439 "Actor %p should not exist in actors_to_run!", this);
440 engine->add_actor_to_run_list_no_check(this);
444 void ActorImpl::set_host(s4u::Host* dest)
446 host_->get_impl()->remove_actor(this);
448 dest->get_impl()->add_actor(this);
451 ActorImplPtr ActorImpl::init(const std::string& name, s4u::Host* host) const
453 auto* actor = new ActorImpl(xbt::string(name), host);
454 actor->set_ppid(this->pid_);
456 intrusive_ptr_add_ref(actor);
457 /* The on_creation() signal must be delayed until there, where the pid and everything is set */
458 s4u::Actor::on_creation(*actor->get_ciface());
460 return ActorImplPtr(actor);
463 ActorImpl* ActorImpl::start(const ActorCode& code)
465 xbt_assert(code && host_ != nullptr, "Invalid parameters");
466 auto* engine = EngineImpl::get_instance();
468 if (not host_->is_on()) {
469 XBT_WARN("Cannot launch actor '%s' on failed host '%s'", name_.c_str(), host_->get_cname());
470 intrusive_ptr_release(this);
471 throw HostFailureException(XBT_THROW_POINT, "Cannot start actor on failed host.");
475 XBT_VERB("Create context %s", get_cname());
476 context_.reset(engine->get_context_factory()->create_context(ActorCode(code), this));
478 XBT_DEBUG("Start context '%s'", get_cname());
480 /* Add the actor to its host's actor list */
481 host_->get_impl()->add_actor(this);
482 engine->add_actor(pid_, this);
484 /* Now insert it in the global actor list and in the actor to run list */
485 engine->add_actor_to_run_list_no_check(this);
490 ActorImplPtr ActorImpl::create(const std::string& name, const ActorCode& code, void* data, s4u::Host* host,
491 const ActorImpl* parent_actor)
493 XBT_DEBUG("Start actor %s@'%s'", name.c_str(), host->get_cname());
496 if (parent_actor != nullptr)
497 actor = parent_actor->init(xbt::string(name), host);
499 actor = self()->init(xbt::string(name), host);
502 actor->piface_.set_data(data);
509 void create_maestro(const std::function<void()>& code)
511 auto* engine = EngineImpl::get_instance();
512 /* Create maestro actor and initialize it */
513 auto* maestro = new ActorImpl(xbt::string(""), /*host*/ nullptr);
516 maestro->context_.reset(engine->get_context_factory()->create_context(ActorCode(), maestro));
518 maestro->context_.reset(engine->get_context_factory()->create_maestro(ActorCode(code), maestro));
521 maestro->simcall_.issuer_ = maestro;
522 engine->set_maestro(maestro);
526 } // namespace kernel
527 } // namespace simgrid
529 /* needs to be public and without simcall because it is called by exceptions and logging events */
530 const char* SIMIX_process_self_get_name()
532 return SIMIX_is_maestro() ? "maestro" : simgrid::kernel::actor::ActorImpl::self()->get_cname();
535 /** @brief Returns the process from PID. */
536 smx_actor_t SIMIX_process_from_PID(aid_t pid) // XBT_ATTRIB_DEPRECATD_v331
538 return simgrid::kernel::actor::ActorImpl::by_pid(pid);
541 int SIMIX_is_maestro()
543 const auto* self = simgrid::kernel::actor::ActorImpl::self();
544 return self == nullptr || simgrid::kernel::EngineImpl::get_instance()->is_maestro(self);