1 /* Copyright (c) 2016-2023. 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/kernel/Timer.hpp>
8 #include <simgrid/kernel/routing/NetPoint.hpp>
9 #include <simgrid/kernel/routing/NetZoneImpl.hpp>
10 #include <simgrid/s4u/Host.hpp>
11 #include <simgrid/sg_config.hpp>
14 #include "src/kernel/EngineImpl.hpp"
15 #include "src/kernel/resource/StandardLinkImpl.hpp"
16 #include "src/kernel/resource/profile/Profile.hpp"
17 #include "src/mc/mc_record.hpp"
18 #include "src/mc/mc_replay.hpp"
19 #include "src/smpi/include/smpi_actor.hpp"
20 #include "src/surf/xml/platf.hpp"
21 #include "xbt/module.h"
22 #include "xbt/xbt_modinter.h" /* whether initialization was already done */
24 #include <boost/algorithm/string/predicate.hpp>
28 #include "src/mc/remote/AppSide.hpp"
31 XBT_LOG_NEW_DEFAULT_CATEGORY(ker_engine, "Logging specific to Engine (kernel)");
33 namespace simgrid::kernel {
34 double EngineImpl::now_ = 0.0;
35 EngineImpl* EngineImpl::instance_ = nullptr; /* That singleton is awful too. */
37 config::Flag<double> cfg_breakpoint{"debug/breakpoint",
38 "When non-negative, raise a SIGTRAP after given (simulated) time", -1.0};
39 config::Flag<bool> cfg_verbose_exit{"debug/verbose-exit", "Display the actor status at exit", true};
41 constexpr std::initializer_list<std::pair<const char*, context::ContextFactory* (*)()>> context_factories = {
43 {"raw", &context::raw_factory},
45 #if HAVE_UCONTEXT_CONTEXTS
46 {"ucontext", &context::sysv_factory},
48 #if HAVE_BOOST_CONTEXTS
49 {"boost", &context::boost_factory},
51 {"thread", &context::thread_factory},
54 static_assert(context_factories.size() > 0, "No context factories are enabled for this build");
56 // Create the list of possible contexts:
57 static inline std::string contexts_list()
61 for (auto const& [factory_name, _] : context_factories) {
62 res += sep + factory_name;
68 static config::Flag<std::string> context_factory_name("contexts/factory",
69 ("Possible values: " + contexts_list()).c_str(),
70 context_factories.begin()->first);
72 } // namespace simgrid::kernel
74 XBT_ATTRIB_NORETURN static void inthandler(int)
76 if (simgrid::kernel::cfg_verbose_exit) {
77 XBT_INFO("CTRL-C pressed. The current status will be displayed before exit (disable that behavior with option "
78 "'debug/verbose-exit').");
79 simgrid::kernel::EngineImpl::get_instance()->display_all_actor_status();
81 XBT_INFO("CTRL-C pressed, exiting. Hiding the current process status since 'debug/verbose-exit' is set to false.");
86 static void segvhandler(int signum, siginfo_t* siginfo, void* /*context*/)
88 if ((siginfo->si_signo == SIGSEGV && siginfo->si_code == SEGV_ACCERR) || siginfo->si_signo == SIGBUS) {
90 "Access violation or Bus error detected.\n"
91 "This probably comes from a programming error in your code, or from a stack\n"
92 "overflow. If you are certain of your code, try increasing the stack size\n"
93 " --cfg=contexts/stack-size:XXX (current size is %u KiB).\n"
95 "If it does not help, this may have one of the following causes:\n"
96 "a bug in SimGrid, a bug in the OS or a bug in a third-party libraries.\n"
97 "Failing hardware can sometimes generate such errors too.\n"
99 "If you think you've found a bug in SimGrid, please report it along with a\n"
100 "Minimal Working Example (MWE) reproducing your problem and a full backtrace\n"
101 "of the fault captured with gdb or valgrind.\n",
102 simgrid::kernel::context::stack_size / 1024);
103 } else if (siginfo->si_signo == SIGSEGV) {
104 fprintf(stderr, "Segmentation fault.\n");
106 if (SMPI_is_inited() && smpi_cfg_privatization() == SmpiPrivStrategies::NONE) {
107 #if HAVE_PRIVATIZATION
108 fprintf(stderr, "Try to enable SMPI variable privatization with --cfg=smpi/privatization:yes.\n");
110 fprintf(stderr, "Sadly, your system does not support --cfg=smpi/privatization:yes (yet).\n");
111 #endif /* HAVE_PRIVATIZATION */
113 #endif /* HAVE_SMPI */
119 * Install signal handler for SIGSEGV. Check that nobody has already installed
120 * its own handler. For example, the Java VM does this.
122 static void install_segvhandler()
126 if (simgrid::kernel::context::Context::install_sigsegv_stack(&old_stack, true) == -1) {
127 XBT_WARN("Failed to register alternate signal stack: %s", strerror(errno));
130 if (not(old_stack.ss_flags & SS_DISABLE)) {
131 XBT_DEBUG("An alternate stack was already installed (sp=%p, size=%zu, flags=%x). Restore it.", old_stack.ss_sp,
132 old_stack.ss_size, (unsigned)old_stack.ss_flags);
133 sigaltstack(&old_stack, nullptr);
136 struct sigaction action;
137 struct sigaction old_action;
138 action.sa_sigaction = &segvhandler;
139 action.sa_flags = SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
140 sigemptyset(&action.sa_mask);
142 /* Linux tend to raise only SIGSEGV where other systems also raise SIGBUS on severe error */
143 for (int sig : {SIGSEGV, SIGBUS}) {
144 if (sigaction(sig, &action, &old_action) == -1) {
145 XBT_WARN("Failed to register signal handler for signal %d: %s", sig, strerror(errno));
148 if ((old_action.sa_flags & SA_SIGINFO) || old_action.sa_handler != SIG_DFL) {
149 XBT_DEBUG("A signal handler was already installed for signal %d (%p). Restore it.", sig,
150 (old_action.sa_flags & SA_SIGINFO) ? (void*)old_action.sa_sigaction : (void*)old_action.sa_handler);
151 sigaction(sig, &old_action, nullptr);
156 namespace simgrid::kernel {
158 EngineImpl::~EngineImpl()
160 /* Also delete the other data */
161 delete netzone_root_;
162 for (auto const& [_, netpoint] : netpoints_)
165 for (auto const& [_, mailbox] : mailboxes_)
168 /* Kill all actors (but maestro) */
169 maestro_->kill_all();
174 delete context_factory_;
176 /* clear models before freeing handle, network models can use external callback defined in the handle */
177 models_prio_.clear();
180 void EngineImpl::initialize(int* argc, char** argv)
182 xbt_assert(EngineImpl::instance_ == nullptr,
183 "It is currently forbidden to create more than one instance of kernel::EngineImpl");
184 EngineImpl::instance_ = this;
186 // The communication initialization is done ASAP, as we need to get some init parameters from the MC for different
187 // layers. But instance_ needs to be created, as we send the address of some of its fields to the MC that wants to
188 // read them directly.
189 simgrid::mc::AppSide::initialize();
192 if (xbt_initialized == 0) {
193 xbt_init(argc, argv);
195 sg_config_init(argc, argv);
198 instance_->context_mod_init();
200 /* Prepare to display some more info when dying on Ctrl-C pressing */
201 std::signal(SIGINT, inthandler);
202 install_segvhandler();
204 /* register a function to be called by SURF after the environment creation */
206 s4u::Engine::on_platform_created_cb([this]() { this->presolve(); });
208 if (config::get_value<bool>("debug/clean-atexit"))
212 void EngineImpl::context_mod_init() const
214 xbt_assert(not instance_->has_context_factory());
216 #if HAVE_SMPI && defined(__NetBSD__)
217 smpi_init_options_internal(false);
218 std::string priv = config::get_value<std::string>("smpi/privatization");
219 if (context_factory_name == "thread" && (priv == "dlopen" || priv == "yes" || priv == "default" || priv == "1")) {
220 XBT_WARN("dlopen+thread broken on Apple and BSD. Switching to raw contexts.");
221 context_factory_name = "raw";
225 #if HAVE_SMPI && defined(__FreeBSD__)
226 smpi_init_options_internal(false);
227 if (context_factory_name == "thread" && config::get_value<std::string>("smpi/privatization") != "no") {
228 XBT_WARN("mmap broken on FreeBSD, but dlopen+thread broken too. Switching to dlopen+raw contexts.");
229 context_factory_name = "raw";
233 /* select the context factory to use to create the contexts */
234 if (context::ContextFactory::initializer) { // Give Java a chance to hijack the factory mechanism
235 instance_->set_context_factory(context::ContextFactory::initializer());
238 /* use the factory specified by --cfg=contexts/factory:value */
239 for (auto const& [factory_name, factory] : context_factories)
240 if (context_factory_name == factory_name) {
241 instance_->set_context_factory(factory());
245 if (not instance_->has_context_factory()) {
246 XBT_ERROR("Invalid context factory specified. Valid factories on this machine:");
247 #if HAVE_RAW_CONTEXTS
248 XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid");
250 XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)");
252 #if HAVE_UCONTEXT_CONTEXTS
253 XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)");
255 XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)");
257 #if HAVE_BOOST_CONTEXTS
258 XBT_ERROR(" boost: this uses the boost libraries context implementation");
260 XBT_ERROR(" (boost was disabled at compilation time on this machine -- check configure logs for details. Did you "
261 "install the libboost-context-dev package?)");
263 XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc");
264 xbt_die("Please use a valid factory.");
268 void EngineImpl::shutdown()
270 if (EngineImpl::instance_ == nullptr)
272 XBT_DEBUG("EngineImpl::shutdown() called. Simulation's over.");
274 if (not instance_->actor_list_.empty()) {
275 if (smpi_process() && smpi_process()->initialized()) {
276 xbt_die("Process exited without calling MPI_Finalize - Killing simulation");
278 XBT_WARN("Process called exit when leaving - Skipping cleanups");
284 if (instance_->has_actors_to_run() && simgrid_get_clock() <= 0.0) {
286 XBT_CRITICAL("The time is still 0, and you still have processes ready to run.");
287 XBT_CRITICAL("It seems that you forgot to run the simulation that you setup.");
288 xbt_die("Bailing out to avoid that stop-before-start madness. Please fix your code.");
291 while (not timer::kernel_timers().empty()) {
292 delete timer::kernel_timers().top().second;
293 timer::kernel_timers().pop();
303 void EngineImpl::seal_platform() const
306 static bool sealed = false;
311 /* seal netzone root, recursively seal children netzones, hosts and disks */
312 netzone_root_->seal();
315 void EngineImpl::load_platform(const std::string& platf)
317 double start = xbt_os_time();
318 if (boost::algorithm::ends_with(platf, ".so") || boost::algorithm::ends_with(platf, ".dylib")) {
319 void* handle = dlopen(platf.c_str(), RTLD_LAZY);
320 xbt_assert(handle, "Impossible to open platform file: %s", platf.c_str());
321 platf_handle_ = std::unique_ptr<void, std::function<int(void*)>>(handle, dlclose);
322 using load_fct_t = void (*)(const simgrid::s4u::Engine&);
323 auto callable = (load_fct_t)dlsym(platf_handle_.get(), "load_platform");
324 const char* dlsym_error = dlerror();
325 xbt_assert(not dlsym_error, "Error: %s", dlsym_error);
326 callable(*simgrid::s4u::Engine::get_instance());
328 parse_platform_file(platf);
331 double end = xbt_os_time();
332 XBT_DEBUG("PARSE TIME: %g", (end - start));
335 void EngineImpl::load_deployment(const std::string& file) const
340 surf_parse_open(file);
345 void EngineImpl::register_function(const std::string& name, const actor::ActorCodeFactory& code)
347 registered_functions[name] = code;
349 void EngineImpl::register_default(const actor::ActorCodeFactory& code)
351 default_function = code;
354 void EngineImpl::add_model(std::shared_ptr<resource::Model> model, const std::vector<resource::Model*>& dependencies)
356 auto model_name = model->get_name();
357 xbt_assert(models_prio_.find(model_name) == models_prio_.end(),
358 "Model %s already exists, use model.set_name() to change its name", model_name.c_str());
360 for (const auto* dep : dependencies) {
361 xbt_assert(models_prio_.find(dep->get_name()) != models_prio_.end(),
362 "Model %s doesn't exists. Impossible to use it as dependency.", dep->get_name().c_str());
364 models_.push_back(model.get());
365 models_prio_[model_name] = std::move(model);
368 /** Wake up all actors waiting for a Surf action to finish */
369 void EngineImpl::handle_ended_actions() const
371 for (auto const& model : models_) {
372 XBT_DEBUG("Handling the failed actions (if any)");
373 while (auto* action = model->extract_failed_action()) {
374 XBT_DEBUG(" Handling Action %p", action);
375 if (action->get_activity() != nullptr) { // Skip vcpu actions
376 // Action failures are not automatically reported when the action is started by maestro (as in SimDAG)
377 if (action->get_activity()->get_actor() == maestro_)
378 action->get_activity()->get_iface()->complete(s4u::Activity::State::FAILED);
380 activity::ActivityImplPtr(action->get_activity())->post();
383 XBT_DEBUG("Handling the terminated actions (if any)");
384 while (auto* action = model->extract_done_action()) {
385 XBT_DEBUG(" Handling Action %p", action);
386 if (action->get_activity() != nullptr) {
387 // Action termination are not automatically reported when the action is started by maestro (as in SimDAG)
388 action->get_activity()->set_finish_time(action->get_finish_time());
390 if (action->get_activity()->get_actor() == maestro_)
391 action->get_activity()->get_iface()->complete(s4u::Activity::State::FINISHED);
393 activity::ActivityImplPtr(action->get_activity())->post();
399 * @brief Executes the actors in actors_to_run.
401 * The actors in actors_to_run are run (in parallel if possible). On exit, actors_to_run is empty, and actors_that_ran
402 * contains the list of actors that just ran. The two lists are swapped so, be careful when using them before and after
403 * a call to this function.
405 void EngineImpl::run_all_actors()
407 instance_->get_context_factory()->run_all(actors_to_run_);
409 for (auto const& actor : actors_to_run_)
410 if (actor->to_be_freed())
411 actor->cleanup_from_kernel();
413 actors_to_run_.swap(actors_that_ran_);
414 actors_to_run_.clear();
417 actor::ActorImpl* EngineImpl::get_actor_by_pid(aid_t pid)
419 auto item = actor_list_.find(pid);
420 return item == actor_list_.end() ? nullptr : item->second;
423 void EngineImpl::remove_daemon(actor::ActorImpl* actor)
425 auto it = daemons_.find(actor);
426 xbt_assert(it != daemons_.end(), "The dying daemon is not a daemon after all. Please report that bug.");
430 void EngineImpl::add_actor_to_run_list_no_check(actor::ActorImpl* actor)
432 XBT_DEBUG("Inserting [%p] %s(%s) in the to_run list", actor, actor->get_cname(), actor->get_host()->get_cname());
433 actors_to_run_.push_back(actor);
436 void EngineImpl::add_actor_to_run_list(actor::ActorImpl* actor)
438 if (std::find(begin(actors_to_run_), end(actors_to_run_), actor) != end(actors_to_run_)) {
439 XBT_DEBUG("Actor %s is already in the to_run list", actor->get_cname());
441 XBT_DEBUG("Inserting [%p] %s(%s) in the to_run list", actor, actor->get_cname(), actor->get_host()->get_cname());
442 actors_to_run_.push_back(actor);
445 void EngineImpl::empty_trash()
447 while (not actors_to_destroy_.empty()) {
448 actor::ActorImpl* actor = &actors_to_destroy_.front();
449 actors_to_destroy_.pop_front();
450 XBT_DEBUG("Getting rid of %s (refcount: %d)", actor->get_cname(), actor->get_refcount());
451 intrusive_ptr_release(actor);
455 void EngineImpl::display_all_actor_status() const
457 XBT_INFO("%zu actors are still running, waiting for something.", actor_list_.size());
458 /* List the actors and their state */
459 XBT_INFO("Legend of the following listing: \"Actor <pid> (<name>@<host>): <status>\"");
460 for (auto const& [_, actor] : actor_list_) {
461 if (actor->waiting_synchro_) {
462 const char* synchro_description = "unknown";
464 if (boost::dynamic_pointer_cast<kernel::activity::ExecImpl>(actor->waiting_synchro_) != nullptr)
465 synchro_description = "execution";
467 if (boost::dynamic_pointer_cast<kernel::activity::CommImpl>(actor->waiting_synchro_) != nullptr)
468 synchro_description = "communication";
470 if (boost::dynamic_pointer_cast<kernel::activity::SleepImpl>(actor->waiting_synchro_) != nullptr)
471 synchro_description = "sleeping";
473 if (boost::dynamic_pointer_cast<kernel::activity::SynchroImpl>(actor->waiting_synchro_) != nullptr)
474 synchro_description = "synchronization";
476 if (boost::dynamic_pointer_cast<kernel::activity::IoImpl>(actor->waiting_synchro_) != nullptr)
477 synchro_description = "I/O";
479 XBT_INFO("Actor %ld (%s@%s): waiting for %s activity %#zx (%s) in state %s to finish %s", actor->get_pid(),
480 actor->get_cname(), actor->get_host()->get_cname(), synchro_description,
481 (xbt_log_no_loc ? (size_t)0xDEADBEEF : (size_t)actor->waiting_synchro_.get()),
482 actor->waiting_synchro_->get_cname(), actor->waiting_synchro_->get_state_str(),
483 (actor->simcall_.observer_ != nullptr && not xbt_log_no_loc
484 ? actor->simcall_.observer_->to_string().c_str()
487 XBT_INFO("Actor %ld (%s@%s) simcall %s", actor->get_pid(), actor->get_cname(), actor->get_host()->get_cname(),
488 (actor->simcall_.observer_ != nullptr ? actor->simcall_.observer_->to_string().c_str()
489 : actor->simcall_.get_cname()));
494 void EngineImpl::presolve() const
496 XBT_DEBUG("Consume all trace events occurring before the starting time.");
497 double next_event_date;
498 while ((next_event_date = profile::future_evt_set.next_date()) != -1.0) {
499 if (next_event_date > now_)
503 resource::Resource* resource = nullptr;
504 while (auto* event = profile::future_evt_set.pop_leq(next_event_date, &value, &resource)) {
506 resource->apply_event(event, value);
510 XBT_DEBUG("Set every models in the right state by updating them to 0.");
511 for (auto const& model : models_)
512 model->update_actions_state(now_, 0.0);
515 double EngineImpl::solve(double max_date) const
517 double time_delta = -1.0; /* duration */
519 resource::Resource* resource = nullptr;
521 if (max_date != -1.0) {
522 xbt_assert(max_date >= now_, "You asked to simulate up to %f, but that's in the past already", max_date);
524 time_delta = max_date - now_;
527 XBT_DEBUG("Looking for next event in all models");
528 for (auto model : models_) {
529 if (not model->next_occurring_event_is_idempotent()) {
532 double next_event = model->next_occurring_event(now_);
533 if ((time_delta < 0.0 || next_event < time_delta) && next_event >= 0.0) {
534 time_delta = next_event;
538 XBT_DEBUG("Min for resources (remember that NS3 don't update that value): %f", time_delta);
540 XBT_DEBUG("Looking for next trace event");
542 while (true) { // Handle next occurring events until none remains
543 double next_event_date = profile::future_evt_set.next_date();
544 XBT_DEBUG("Next TRACE event: %f", next_event_date);
546 for (auto model : models_) {
547 /* Skip all idempotent models, they were already treated above
548 * NS3 is the one to handled here */
549 if (model->next_occurring_event_is_idempotent())
552 if (next_event_date != -1.0) {
553 time_delta = std::min(next_event_date - now_, time_delta);
555 time_delta = std::max(next_event_date - now_, time_delta); // Get the positive component
558 XBT_DEBUG("Run the NS3 network at most %fs", time_delta);
559 // run until min or next flow
560 double model_next_action_end = model->next_occurring_event(time_delta);
562 XBT_DEBUG("Min for network : %f", model_next_action_end);
563 if (model_next_action_end >= 0.0)
564 time_delta = model_next_action_end;
567 if (next_event_date < 0.0 || (next_event_date > now_ + time_delta)) {
568 // next event may have already occurred or will after the next resource change, then bail out
569 XBT_DEBUG("no next usable TRACE event. Stop searching for it");
573 XBT_DEBUG("Updating models (min = %g, NOW = %g, next_event_date = %g)", time_delta, now_, next_event_date);
575 while (auto* event = profile::future_evt_set.pop_leq(next_event_date, &value, &resource)) {
578 if (resource->is_used() || (watched_hosts().find(resource->get_cname()) != watched_hosts().end())) {
579 time_delta = next_event_date - now_;
580 XBT_DEBUG("This event invalidates the next_occurring_event() computation of models. Next event set to %f",
583 // FIXME: I'm too lame to update now_ live, so I change it and restore it so that the real update with surf_min
585 double round_start = now_;
586 now_ = next_event_date;
587 /* update state of the corresponding resource to the new value. Does not touch lmm.
588 It will be modified if needed when updating actions */
589 XBT_DEBUG("Calling update_resource_state for resource %s", resource->get_cname());
590 resource->apply_event(event, value);
595 /* FIXME: Moved this test to here to avoid stopping simulation if there are actions running on cpus and all cpus are
596 * with availability = 0. This may cause an infinite loop if one cpu has a trace with periodicity = 0 and the other a
597 * trace with periodicity > 0.
598 * The options are: all traces with same periodicity(0 or >0) or we need to change the way how the events are managed
600 if (time_delta < 0) {
601 XBT_DEBUG("No next event at all. Bail out now.");
605 XBT_DEBUG("Duration set to %f", time_delta);
607 // Bump the time: jump into the future
610 // Inform the models of the date change
611 for (auto const& model : models_)
612 model->update_actions_state(now_, time_delta);
614 s4u::Engine::on_time_advance(time_delta);
619 void EngineImpl::run(double max_date)
623 if (MC_is_active()) {
625 mc::AppSide::get()->main_loop();
627 xbt_die("MC_is_active() is not supposed to return true in non-MC settings");
629 THROW_IMPOSSIBLE; // main_loop never returns
632 if (MC_record_replay_is_active()) {
633 mc::RecordTrace::replay(MC_record_path());
638 double elapsed_time = -1;
639 const std::set<s4u::Activity*>* vetoed_activities = s4u::Activity::get_vetoed_activities();
642 XBT_DEBUG("New Schedule Round; size(queue)=%zu", actors_to_run_.size());
644 if (cfg_breakpoint >= 0.0 && simgrid_get_clock() >= cfg_breakpoint) {
645 XBT_DEBUG("Breakpoint reached (%g)", cfg_breakpoint.get());
646 cfg_breakpoint = -1.0; // Let the simulation continue without hiting the breakpoint again and again
654 while (not actors_to_run_.empty()) {
655 XBT_DEBUG("New Sub-Schedule Round; size(queue)=%zu", actors_to_run_.size());
657 /* Run all actors that are ready to run, possibly in parallel */
660 /* answer sequentially and in a fixed arbitrary order all the simcalls that were issued during that sub-round.
661 * The order must be fixed for the simulation to be reproducible (see RR-7653). It's OK here because only maestro
662 * changes the list. Killer actors are moved to the end to let victims finish their simcall before dying, but
663 * the order remains reproducible (even if arbitrarily). No need to sort the vector for sake of reproducibility.
665 for (auto const& actor : actors_that_ran_)
666 if (actor->simcall_.call_ != actor::Simcall::Type::NONE)
667 actor->simcall_handle(0);
669 handle_ended_actions();
671 /* If only daemon actors remain, cancel their actions, mark them to die and reschedule them */
672 if (actor_list_.size() == daemons_.size())
673 for (auto const& dmon : daemons_) {
674 XBT_DEBUG("Kill %s", dmon->get_cname());
675 maestro_->kill(dmon);
679 // Compute the max_date of the next solve.
680 // It's either when a timer occurs, or when user-specified deadline is reached, or -1 if none is given
681 double next_time = timer::Timer::next();
682 if (next_time < 0 && max_date > -1) {
683 next_time = max_date;
684 } else if (next_time > -1 && max_date > -1) { // either both <0, or both >0
685 next_time = std::min(next_time, max_date);
688 XBT_DEBUG("Calling solve(%g) %g", next_time, now_);
689 elapsed_time = solve(next_time);
690 XBT_DEBUG("Moving time ahead. NOW=%g; elapsed: %g", now_, elapsed_time);
692 // Execute timers until there isn't anything to be done:
695 again = timer::Timer::execute_all();
696 handle_ended_actions();
699 /* Clean actors to destroy */
702 XBT_DEBUG("### elapsed time %f, #actors %zu, #to_run %zu, #vetoed %d", elapsed_time, actor_list_.size(),
703 actors_to_run_.size(), (vetoed_activities == nullptr ? -1 : static_cast<int>(vetoed_activities->size())));
705 if (elapsed_time < 0. && actors_to_run_.empty() && not actor_list_.empty()) {
706 if (actor_list_.size() <= daemons_.size()) {
707 XBT_CRITICAL("Oops! Daemon actors cannot do any blocking activity (communications, synchronization, etc) "
708 "once the simulation is over. Please fix your on_exit() functions.");
710 XBT_CRITICAL("Oops! Deadlock detected, some activities are still around but will never complete. "
711 "This usually happens when the user code is not perfectly clean.");
713 display_all_actor_status();
714 simgrid::s4u::Engine::on_deadlock();
715 for (auto const& [_, actor] : actor_list_) {
716 XBT_DEBUG("Kill %s", actor->get_cname());
717 maestro_->kill(actor);
720 } while ((vetoed_activities == nullptr || vetoed_activities->empty()) &&
721 ((elapsed_time > -1.0 && not double_equals(max_date, now_, 0.00001)) || has_actors_to_run()));
723 if (not actor_list_.empty() && max_date < 0 && not(vetoed_activities == nullptr || vetoed_activities->empty()))
726 simgrid::s4u::Engine::on_simulation_end();
729 double EngineImpl::get_clock()
733 } // namespace simgrid::kernel