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/Exception.hpp>
7 #include <simgrid/s4u/Actor.hpp>
8 #include <simgrid/s4u/Host.hpp>
10 #include "src/kernel/EngineImpl.hpp"
12 #include "src/smpi/include/private.hpp"
14 #include "src/surf/HostImpl.hpp"
16 #include <boost/core/demangle.hpp>
20 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix, "Logging specific to SIMIX (process)");
23 * @brief Returns the current agent.
25 * This functions returns the currently running SIMIX process.
27 * @return The SIMIX process
29 smx_actor_t SIMIX_process_self() // XBT_ATTRIB_DEPRECATED_v333
31 return simgrid::kernel::actor::ActorImpl::self();
38 static unsigned long maxpid = 0;
39 unsigned long get_maxpid()
43 unsigned long* get_maxpid_addr()
47 ActorImpl* ActorImpl::by_pid(aid_t pid)
49 return EngineImpl::get_instance()->get_actor_by_pid(pid);
52 ActorImpl* ActorImpl::self()
54 const context::Context* self_context = context::Context::self();
56 return (self_context != nullptr) ? self_context->get_actor() : nullptr;
59 ActorImpl::ActorImpl(xbt::string name, s4u::Host* host) : host_(host), name_(std::move(name)), piface_(this)
62 simcall_.issuer_ = this;
63 stacksize_ = context::stack_size;
66 ActorImpl::~ActorImpl()
68 if (EngineImpl::has_instance() && not EngineImpl::get_instance()->is_maestro(this))
69 s4u::Actor::on_destruction(*get_ciface());
72 /* Become an actor in the simulation
74 * Currently this can only be called by the main thread (once) and only work with some thread factories
75 * (currently ThreadContextFactory).
77 * In the future, it might be extended in order to attach other threads created by a third party library.
80 ActorImplPtr ActorImpl::attach(const std::string& name, void* data, s4u::Host* host)
82 // This is mostly a copy/paste from create(), it'd be nice to share some code between those two functions.
83 auto* engine = EngineImpl::get_instance();
84 XBT_DEBUG("Attach actor %s on host '%s'", name.c_str(), host->get_cname());
86 if (not host->is_on()) {
87 XBT_WARN("Cannot attach actor '%s' on failed host '%s'", name.c_str(), host->get_cname());
88 throw HostFailureException(XBT_THROW_POINT, "Cannot attach actor on failed host.");
91 auto* actor = new ActorImpl(xbt::string(name), host);
93 actor->piface_.set_data(data);
94 actor->code_ = nullptr;
96 XBT_VERB("Create context %s", actor->get_cname());
97 actor->context_.reset(engine->get_context_factory()->attach(actor));
99 /* Add the actor to it's host actor list */
100 host->get_impl()->add_actor(actor);
102 /* Now insert it in the global actor list and in the actors to run list */
103 engine->add_actor(actor->get_pid(), actor);
104 engine->add_actor_to_run_list_no_check(actor);
105 intrusive_ptr_add_ref(actor);
107 auto* context = dynamic_cast<context::AttachContext*>(actor->context_.get());
108 xbt_assert(nullptr != context, "Not a suitable context");
109 context->attach_start();
111 /* The on_creation() signal must be delayed until there, where the pid and everything is set */
112 s4u::Actor::on_creation(*actor->get_ciface());
114 return ActorImplPtr(actor);
116 /** @brief Detach an actor attached with `attach()`
118 * This is called when the current actor has finished its job.
119 * Used in the main thread, it waits for the simulation to finish before returning. When it returns, the other
120 * simulated actors and the maestro are destroyed.
122 void ActorImpl::detach()
124 auto* context = dynamic_cast<context::AttachContext*>(context::Context::self());
125 xbt_assert(context != nullptr, "Not a suitable context");
127 context->get_actor()->cleanup();
128 context->attach_stop();
131 void ActorImpl::cleanup_from_simix()
133 auto* engine = EngineImpl::get_instance();
134 const std::lock_guard<std::mutex> lock(engine->get_mutex());
135 engine->remove_actor(pid_);
136 if (host_ && host_actor_list_hook.is_linked())
137 host_->get_impl()->remove_actor(this);
138 if (not kernel_destroy_list_hook.is_linked()) {
140 engine->add_dead_actor_to_dynar(this);
142 engine->add_actor_to_destroy_list(*this);
146 void ActorImpl::cleanup()
150 if (has_to_auto_restart() && not get_host()->is_on()) {
151 XBT_DEBUG("Insert host %s to watched_hosts because it's off and %s needs to restart", get_host()->get_cname(),
153 watched_hosts().insert(get_host()->get_name());
157 // Execute the termination callbacks
158 bool failed = context_->wannadie();
159 for (auto exit_fun = on_exit->crbegin(); exit_fun != on_exit->crend(); ++exit_fun)
165 /* cancel non-blocking activities */
166 for (auto activity : activities_)
170 XBT_DEBUG("%s@%s(%ld) should not run anymore", get_cname(), get_host()->get_cname(), get_pid());
172 if (EngineImpl::get_instance()->is_maestro(this)) /* Do not cleanup maestro */
175 XBT_DEBUG("Cleanup actor %s (%p), waiting synchro %p", get_cname(), this, waiting_synchro_.get());
177 /* Unregister associated timers if any */
178 if (kill_timer_ != nullptr) {
179 kill_timer_->remove();
180 kill_timer_ = nullptr;
182 if (simcall_.timeout_cb_) {
183 simcall_.timeout_cb_->remove();
184 simcall_.timeout_cb_ = nullptr;
187 cleanup_from_simix();
189 context_->set_wannadie(false); // don't let the simcall's yield() do a Context::stop(), to avoid infinite loops
190 actor::simcall([this] { s4u::Actor::on_termination(*get_ciface()); });
191 context_->set_wannadie();
194 void ActorImpl::exit()
196 context_->set_wannadie();
198 exception_ = nullptr;
200 /* destroy the blocking synchro if any */
201 if (waiting_synchro_ != nullptr) {
202 waiting_synchro_->cancel();
203 waiting_synchro_->state_ = activity::State::FAILED;
205 activity::ExecImplPtr exec = boost::dynamic_pointer_cast<activity::ExecImpl>(waiting_synchro_);
206 activity::CommImplPtr comm = boost::dynamic_pointer_cast<activity::CommImpl>(waiting_synchro_);
208 if (exec != nullptr) {
209 exec->clean_action();
210 } else if (comm != nullptr) {
211 comm->unregister_simcall(&simcall_);
213 activity::ActivityImplPtr(waiting_synchro_)->finish();
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 auto* engine = EngineImpl::get_instance();
230 xbt_assert(not engine->is_maestro(actor), "Killing maestro is a rather bad idea");
231 if (actor->finished_) {
232 XBT_DEBUG("Ignoring request to kill actor %s@%s that is already dead", actor->get_cname(),
233 actor->host_->get_cname());
237 XBT_DEBUG("Actor '%s'@%s is killing actor '%s'@%s", get_cname(), host_ ? host_->get_cname() : "", actor->get_cname(),
238 actor->host_ ? actor->host_->get_cname() : "");
243 XBT_DEBUG("Go on, this is a suicide,");
245 engine->add_actor_to_run_list(actor);
248 void ActorImpl::kill_all() const
250 for (auto const& kv : EngineImpl::get_instance()->get_actor_list())
251 if (kv.second != this)
252 this->kill(kv.second);
255 void ActorImpl::set_kill_time(double kill_time)
257 if (kill_time <= s4u::Engine::get_clock())
259 XBT_DEBUG("Set kill time %f for actor %s@%s", kill_time, get_cname(), host_->get_cname());
260 kill_timer_ = timer::Timer::set(kill_time, [this] {
262 kill_timer_ = nullptr;
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 */
278 /* Ok, maestro returned control to us */
279 XBT_DEBUG("Control returned to me: '%s'", get_cname());
281 if (context_->wannadie()) {
282 XBT_DEBUG("Actor %s@%s is dead", get_cname(), host_->get_cname());
288 XBT_DEBUG("Hey! I'm suspended.");
289 xbt_assert(exception_ == nullptr, "Gasp! This exception may be lost by subsequent calls.");
290 yield(); // Yield back to maestro without proceeding with my execution. I'll get rescheduled by resume()
293 if (exception_ != nullptr) {
294 XBT_DEBUG("Wait, maestro left me an exception");
295 std::exception_ptr exception = std::move(exception_);
296 exception_ = nullptr;
298 std::rethrow_exception(std::move(exception));
299 } catch (const simgrid::Exception& e) {
300 e.rethrow_nested(XBT_THROW_POINT, boost::core::demangle(typeid(e).name()) + " raised in kernel mode.");
306 smpi_switch_data_segment(get_iface());
310 /** This actor will be terminated automatically when the last non-daemon actor finishes */
311 void ActorImpl::daemonize()
315 EngineImpl::get_instance()->add_daemon(this);
319 void ActorImpl::undaemonize()
323 EngineImpl::get_instance()->remove_daemon(this);
327 s4u::Actor* ActorImpl::restart()
329 xbt_assert(not EngineImpl::get_instance()->is_maestro(this), "Restarting maestro is not supported");
331 XBT_DEBUG("Restarting actor %s on %s", get_cname(), host_->get_cname());
333 // retrieve the arguments of the old actor
334 ProcessArg arg(host_, this);
336 // kill the old actor
337 context::Context::self()->get_actor()->kill(this);
339 // start the new actor
340 ActorImplPtr actor = ActorImpl::create(arg.name, arg.code, arg.data, arg.host, nullptr);
341 actor->set_properties(arg.properties);
342 *actor->on_exit = std::move(*arg.on_exit);
343 actor->set_kill_time(arg.kill_time);
344 actor->set_auto_restart(arg.auto_restart);
346 return actor->get_ciface();
349 void ActorImpl::suspend()
352 XBT_DEBUG("Actor '%s' is already suspended", get_cname());
358 /* Suspend the activities associated with this actor. */
359 for (auto const& activity : activities_)
363 void ActorImpl::resume()
365 XBT_IN("actor = %p", this);
367 if (context_->wannadie()) {
368 XBT_VERB("Ignoring request to suspend an actor that is currently dying.");
376 /* resume the activities that were blocked when suspending the actor. */
377 for (auto const& activity : activities_)
379 if (not waiting_synchro_) // Reschedule the actor if it was forcefully unscheduled in yield()
380 EngineImpl::get_instance()->add_actor_to_run_list_no_check(this);
385 activity::ActivityImplPtr ActorImpl::join(const ActorImpl* actor, double timeout)
387 activity::ActivityImplPtr sleep = this->sleep(timeout);
388 actor->on_exit->emplace_back([sleep](bool) {
389 if (sleep->surf_action_)
390 sleep->surf_action_->finish(resource::Action::State::FINISHED);
395 activity::ActivityImplPtr ActorImpl::sleep(double duration)
397 if (not host_->is_on())
398 throw_exception(std::make_exception_ptr(HostFailureException(
399 XBT_THROW_POINT, std::string("Host ") + host_->get_cname() + " failed, you cannot sleep there.")));
401 auto sleep = new activity::SleepImpl();
402 sleep->set_name("sleep").set_host(host_).set_duration(duration).start();
403 return activity::SleepImplPtr(sleep);
406 void ActorImpl::throw_exception(std::exception_ptr e)
413 /* cancel the blocking synchro if any */
414 if (waiting_synchro_) {
415 waiting_synchro_->cancel();
416 activities_.remove(waiting_synchro_);
417 waiting_synchro_ = nullptr;
421 void ActorImpl::simcall_answer()
423 auto* engine = EngineImpl::get_instance();
424 if (not engine->is_maestro(this)) {
425 XBT_DEBUG("Answer simcall %s issued by %s (%p)", SIMIX_simcall_name(simcall_), get_cname(), this);
426 xbt_assert(simcall_.call_ != simix::Simcall::NONE);
427 simcall_.call_ = simix::Simcall::NONE;
428 const auto& actors_to_run = engine->get_actors_to_run();
429 xbt_assert(not XBT_LOG_ISENABLED(simix_process, xbt_log_priority_debug) ||
430 std::find(begin(actors_to_run), end(actors_to_run), this) == end(actors_to_run),
431 "Actor %p should not exist in actors_to_run!", this);
432 engine->add_actor_to_run_list_no_check(this);
436 void ActorImpl::set_host(s4u::Host* dest)
438 host_->get_impl()->remove_actor(this);
440 dest->get_impl()->add_actor(this);
443 ActorImplPtr ActorImpl::init(const std::string& name, s4u::Host* host) const
445 auto* actor = new ActorImpl(xbt::string(name), host);
446 actor->set_ppid(this->pid_);
448 intrusive_ptr_add_ref(actor);
449 /* The on_creation() signal must be delayed until there, where the pid and everything is set */
450 s4u::Actor::on_creation(*actor->get_ciface());
452 return ActorImplPtr(actor);
455 ActorImpl* ActorImpl::start(const ActorCode& code)
457 xbt_assert(code && host_ != nullptr, "Invalid parameters");
458 auto* engine = EngineImpl::get_instance();
460 if (not host_->is_on()) {
461 XBT_WARN("Cannot launch actor '%s' on failed host '%s'", name_.c_str(), host_->get_cname());
462 intrusive_ptr_release(this);
463 throw HostFailureException(XBT_THROW_POINT, "Cannot start actor on failed host.");
467 XBT_VERB("Create context %s", get_cname());
468 context_.reset(engine->get_context_factory()->create_context(ActorCode(code), this));
470 XBT_DEBUG("Start context '%s'", get_cname());
472 /* Add the actor to its host's actor list */
473 host_->get_impl()->add_actor(this);
474 engine->add_actor(pid_, this);
476 /* Now insert it in the global actor list and in the actor to run list */
477 engine->add_actor_to_run_list_no_check(this);
482 ActorImplPtr ActorImpl::create(const std::string& name, const ActorCode& code, void* data, s4u::Host* host,
483 const ActorImpl* parent_actor)
485 XBT_DEBUG("Start actor %s@'%s'", name.c_str(), host->get_cname());
488 if (parent_actor != nullptr)
489 actor = parent_actor->init(xbt::string(name), host);
491 actor = self()->init(xbt::string(name), host);
494 actor->piface_.set_data(data);
501 void create_maestro(const std::function<void()>& code)
503 auto* engine = EngineImpl::get_instance();
504 /* Create maestro actor and initialize it */
505 auto* maestro = new ActorImpl(xbt::string(""), /*host*/ nullptr);
508 maestro->context_.reset(engine->get_context_factory()->create_context(ActorCode(), maestro));
510 maestro->context_.reset(engine->get_context_factory()->create_maestro(ActorCode(code), maestro));
513 maestro->simcall_.issuer_ = maestro;
514 engine->set_maestro(maestro);
518 } // namespace kernel
519 } // namespace simgrid
521 /* needs to be public and without simcall because it is called by exceptions and logging events */
522 const char* SIMIX_process_self_get_name() // XBT_ATTRIB_DEPRECATED_v333
524 return SIMIX_is_maestro() ? "maestro" : simgrid::kernel::actor::ActorImpl::self()->get_cname();
527 /** @brief Returns the process from PID. */
528 smx_actor_t SIMIX_process_from_PID(aid_t pid) // XBT_ATTRIB_DEPRECATD_v331
530 return simgrid::kernel::actor::ActorImpl::by_pid(pid);
533 int SIMIX_is_maestro()
535 const auto* self = simgrid::kernel::actor::ActorImpl::self();
536 return self == nullptr || simgrid::kernel::EngineImpl::get_instance()->is_maestro(self);