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. */
7 #include "simgrid/kernel/Timer.hpp"
8 #include "simgrid/s4u/Engine.hpp"
9 #include "simgrid/s4u/Host.hpp"
10 #include "src/smpi/include/smpi_actor.hpp"
12 #include "simgrid/sg_config.hpp"
13 #include "src/kernel/EngineImpl.hpp"
14 #include "src/kernel/activity/ExecImpl.hpp"
15 #include "src/kernel/activity/IoImpl.hpp"
16 #include "src/kernel/activity/MailboxImpl.hpp"
17 #include "src/kernel/activity/SleepImpl.hpp"
18 #include "src/kernel/activity/SynchroRaw.hpp"
19 #include "src/mc/mc_record.hpp"
20 #include "src/mc/mc_replay.hpp"
21 #include "src/simix/smx_private.hpp"
22 #include "src/surf/xml/platf.hpp"
24 #include "simgrid/kernel/resource/Model.hpp"
27 #include "src/mc/remote/AppSide.hpp"
32 XBT_LOG_NEW_CATEGORY(simix, "All SIMIX categories");
33 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_kernel, simix, "Logging specific to SIMIX (kernel)");
35 std::unique_ptr<simgrid::simix::Global> simix_global;
37 void (*SMPI_switch_data_segment)(simgrid::s4u::ActorPtr) = nullptr;
41 config::Flag<bool> cfg_verbose_exit{"debug/verbose-exit", "Display the actor status at exit", true};
43 xbt_dynar_t simix_global_get_actors_addr()
46 return simix_global->actors_vector;
48 xbt_die("This function is intended to be used when compiling with MC");
51 xbt_dynar_t simix_global_get_dead_actors_addr()
54 return simix_global->dead_actors_vector;
56 xbt_die("This function is intended to be used when compiling with MC");
61 } // namespace simgrid
63 XBT_ATTRIB_NORETURN static void inthandler(int)
65 if (simgrid::simix::cfg_verbose_exit) {
66 XBT_INFO("CTRL-C pressed. The current status will be displayed before exit (disable that behavior with option "
67 "'debug/verbose-exit').");
68 simix_global->display_all_actor_status();
70 XBT_INFO("CTRL-C pressed, exiting. Hiding the current process status since 'debug/verbose-exit' is set to false.");
76 static void segvhandler(int signum, siginfo_t* siginfo, void* /*context*/)
78 if ((siginfo->si_signo == SIGSEGV && siginfo->si_code == SEGV_ACCERR) || siginfo->si_signo == SIGBUS) {
80 "Access violation or Bus error detected.\n"
81 "This probably comes from a programming error in your code, or from a stack\n"
82 "overflow. If you are certain of your code, try increasing the stack size\n"
83 " --cfg=contexts/stack-size=XXX (current size is %u KiB).\n"
85 "If it does not help, this may have one of the following causes:\n"
86 "a bug in SimGrid, a bug in the OS or a bug in a third-party libraries.\n"
87 "Failing hardware can sometimes generate such errors too.\n"
89 "If you think you've found a bug in SimGrid, please report it along with a\n"
90 "Minimal Working Example (MWE) reproducing your problem and a full backtrace\n"
91 "of the fault captured with gdb or valgrind.\n",
92 smx_context_stack_size / 1024);
93 } else if (siginfo->si_signo == SIGSEGV) {
94 fprintf(stderr, "Segmentation fault.\n");
96 if (smpi_enabled() && smpi_cfg_privatization() == SmpiPrivStrategies::NONE) {
97 #if HAVE_PRIVATIZATION
98 fprintf(stderr, "Try to enable SMPI variable privatization with --cfg=smpi/privatization:yes.\n");
100 fprintf(stderr, "Sadly, your system does not support --cfg=smpi/privatization:yes (yet).\n");
101 #endif /* HAVE_PRIVATIZATION */
103 #endif /* HAVE_SMPI */
109 * Install signal handler for SIGSEGV. Check that nobody has already installed
110 * its own handler. For example, the Java VM does this.
112 static void install_segvhandler()
116 if (simgrid::kernel::context::Context::install_sigsegv_stack(&old_stack, true) == -1) {
117 XBT_WARN("Failed to register alternate signal stack: %s", strerror(errno));
120 if (not(old_stack.ss_flags & SS_DISABLE)) {
121 XBT_DEBUG("An alternate stack was already installed (sp=%p, size=%zu, flags=%x). Restore it.", old_stack.ss_sp,
122 old_stack.ss_size, (unsigned)old_stack.ss_flags);
123 sigaltstack(&old_stack, nullptr);
126 struct sigaction action;
127 struct sigaction old_action;
128 action.sa_sigaction = &segvhandler;
129 action.sa_flags = SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
130 sigemptyset(&action.sa_mask);
132 /* Linux tend to raise only SIGSEGV where other systems also raise SIGBUS on severe error */
133 for (int sig : {SIGSEGV, SIGBUS}) {
134 if (sigaction(sig, &action, &old_action) == -1) {
135 XBT_WARN("Failed to register signal handler for signal %d: %s", sig, strerror(errno));
138 if ((old_action.sa_flags & SA_SIGINFO) || old_action.sa_handler != SIG_DFL) {
139 XBT_DEBUG("A signal handler was already installed for signal %d (%p). Restore it.", sig,
140 (old_action.sa_flags & SA_SIGINFO) ? (void*)old_action.sa_sigaction : (void*)old_action.sa_handler);
141 sigaction(sig, &old_action, nullptr);
148 /********************************* SIMIX **************************************/
152 /** Execute all the tasks that are queued, e.g. `.then()` callbacks of futures. */
153 bool Global::execute_tasks()
155 xbt_assert(tasksTemp.empty());
161 // We don't want the callbacks to modify the vector we are iterating over:
162 tasks.swap(tasksTemp);
164 // Execute all the queued tasks:
165 for (auto& task : tasksTemp)
169 } while (not tasks.empty());
174 void Global::empty_trash()
176 while (not actors_to_destroy.empty()) {
177 kernel::actor::ActorImpl* actor = &actors_to_destroy.front();
178 actors_to_destroy.pop_front();
179 XBT_DEBUG("Getting rid of %s (refcount: %d)", actor->get_cname(), actor->get_refcount());
180 intrusive_ptr_release(actor);
183 xbt_dynar_reset(dead_actors_vector);
187 * @brief Executes the actors in actors_to_run.
189 * The actors in actors_to_run are run (in parallel if possible). On exit, actors_to_run is empty, and actors_that_ran
190 * contains the list of actors that just ran. The two lists are swapped so, be careful when using them before and after
191 * a call to this function.
193 void Global::run_all_actors()
195 simix_global->context_factory->run_all();
197 actors_to_run.swap(actors_that_ran);
198 actors_to_run.clear();
201 void Global::display_all_actor_status() const
203 XBT_INFO("%zu actors are still running, waiting for something.", process_list.size());
204 /* List the actors and their state */
205 XBT_INFO("Legend of the following listing: \"Actor <pid> (<name>@<host>): <status>\"");
206 for (auto const& kv : process_list) {
207 kernel::actor::ActorImpl* actor = kv.second;
209 if (actor->waiting_synchro_) {
210 const char* synchro_description = "unknown";
212 if (boost::dynamic_pointer_cast<kernel::activity::ExecImpl>(actor->waiting_synchro_) != nullptr)
213 synchro_description = "execution";
215 if (boost::dynamic_pointer_cast<kernel::activity::CommImpl>(actor->waiting_synchro_) != nullptr)
216 synchro_description = "communication";
218 if (boost::dynamic_pointer_cast<kernel::activity::SleepImpl>(actor->waiting_synchro_) != nullptr)
219 synchro_description = "sleeping";
221 if (boost::dynamic_pointer_cast<kernel::activity::RawImpl>(actor->waiting_synchro_) != nullptr)
222 synchro_description = "synchronization";
224 if (boost::dynamic_pointer_cast<kernel::activity::IoImpl>(actor->waiting_synchro_) != nullptr)
225 synchro_description = "I/O";
227 XBT_INFO("Actor %ld (%s@%s): waiting for %s activity %#zx (%s) in state %d to finish", actor->get_pid(),
228 actor->get_cname(), actor->get_host()->get_cname(), synchro_description,
229 (xbt_log_no_loc ? (size_t)0xDEADBEEF : (size_t)actor->waiting_synchro_.get()),
230 actor->waiting_synchro_->get_cname(), (int)actor->waiting_synchro_->state_);
232 XBT_INFO("Actor %ld (%s@%s) simcall %s", actor->get_pid(), actor->get_cname(), actor->get_host()->get_cname(),
233 SIMIX_simcall_name(actor->simcall_));
239 } // namespace simgrid
241 static simgrid::kernel::actor::ActorCode maestro_code;
242 void SIMIX_set_maestro(void (*code)(void*), void* data)
245 XBT_INFO("WARNING, SIMIX_set_maestro is believed to not work on windows. Please help us investigating this issue if "
246 "you need that feature");
248 maestro_code = std::bind(code, data);
251 void SIMIX_global_init(int* argc, char** argv)
253 if (simix_global == nullptr) {
254 simix_global = std::make_unique<simgrid::simix::Global>();
257 // The communication initialization is done ASAP, as we need to get some init parameters from the MC for different layers.
258 // But simix_global needs to be created, as we send the address of some of its fields to the MC that wants to read them directly.
259 simgrid::mc::AppSide::initialize();
262 surf_init(argc, argv); /* Initialize SURF structures */
264 simix_global->maestro_ = nullptr;
265 SIMIX_context_mod_init();
267 // Either create a new context with maestro or create
268 // a context object with the current context maestro):
269 simgrid::kernel::actor::create_maestro(maestro_code);
271 /* Prepare to display some more info when dying on Ctrl-C pressing */
272 std::signal(SIGINT, inthandler);
275 install_segvhandler();
277 /* register a function to be called by SURF after the environment creation */
279 simgrid::s4u::Engine::on_platform_created.connect(surf_presolve);
282 if (simgrid::config::get_value<bool>("debug/clean-atexit"))
288 * @brief Clean the SIMIX simulation
290 * This functions remove the memory used by SIMIX
294 static bool smx_cleaned = false;
296 return; // to avoid double cleaning by java and C
299 XBT_DEBUG("SIMIX_clean called. Simulation's over.");
300 if (not simix_global->actors_to_run.empty() && SIMIX_get_clock() <= 0.0) {
302 XBT_CRITICAL("The time is still 0, and you still have processes ready to run.");
303 XBT_CRITICAL("It seems that you forgot to run the simulation that you setup.");
304 xbt_die("Bailing out to avoid that stop-before-start madness. Please fix your code.");
308 if (not simix_global->process_list.empty()) {
309 if (smpi_process()->initialized()) {
310 xbt_die("Process exited without calling MPI_Finalize - Killing simulation");
312 XBT_WARN("Process called exit when leaving - Skipping cleanups");
318 /* Kill all processes (but maestro) */
319 simix_global->maestro_->kill_all();
320 simix_global->run_all_actors();
321 simix_global->empty_trash();
323 /* Exit the SIMIX network module */
324 SIMIX_mailbox_exit();
326 while (not simgrid::kernel::timer::kernel_timers().empty()) {
327 delete simgrid::kernel::timer::kernel_timers().top().second;
328 simgrid::kernel::timer::kernel_timers().pop();
330 /* Free the remaining data structures */
331 simix_global->actors_to_run.clear();
332 simix_global->actors_that_ran.clear();
333 simix_global->actors_to_destroy.clear();
334 simix_global->process_list.clear();
337 xbt_dynar_free(&simix_global->actors_vector);
338 xbt_dynar_free(&simix_global->dead_actors_vector);
341 /* Let's free maestro now */
342 delete simix_global->maestro_;
343 simix_global->maestro_ = nullptr;
345 /* Finish context module and SURF */
346 SIMIX_context_mod_exit();
350 simix_global = nullptr;
355 * @brief A clock (in second).
357 * @return Return the clock.
359 double SIMIX_get_clock()
361 if (MC_is_active() || MC_record_replay_is_active()) {
362 return MC_process_clock_get(SIMIX_process_self());
364 return surf_get_clock();
368 void SIMIX_run() // XBT_ATTRIB_DEPRECATED_v332
370 simgrid::kernel::EngineImpl::get_instance()->run();
373 double SIMIX_timer_next() // XBT_ATTRIB_DEPRECATED_v329
375 return simgrid::kernel::timer::Timer::next();
378 smx_timer_t SIMIX_timer_set(double date, void (*callback)(void*), void* arg) // XBT_ATTRIB_DEPRECATED_v329
380 return simgrid::kernel::timer::Timer::set(date, std::bind(callback, arg));
383 /** @brief cancels a timer that was added earlier */
384 void SIMIX_timer_remove(smx_timer_t timer) // XBT_ATTRIB_DEPRECATED_v329
389 /** @brief Returns the date at which the timer will trigger (or 0 if nullptr timer) */
390 double SIMIX_timer_get_date(smx_timer_t timer) // XBT_ATTRIB_DEPRECATED_v329
392 return timer ? timer->get_date() : 0.0;
395 void SIMIX_display_process_status() // XBT_ATTRIB_DEPRECATED_v329
397 simix_global->display_all_actor_status();
400 int SIMIX_is_maestro()
402 if (simix_global == nullptr) // SimDag
404 const simgrid::kernel::actor::ActorImpl* self = SIMIX_process_self();
405 return self == nullptr || self == simix_global->maestro_;