1 /* Copyright (c) 2007-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include <signal.h> /* Signal handling */
11 #include "src/internal_config.h"
13 #include "src/surf/surf_interface.hpp"
14 #include "src/surf/storage_interface.hpp"
15 #include "src/surf/xml/platf.hpp"
16 #include "smx_private.h"
18 #include "xbt/ex.h" /* ex_backtrace_display */
20 #include "src/mc/mc_replay.h"
21 #include "simgrid/sg_config.h"
23 #include "src/simix/SynchroExec.hpp"
24 #include "src/simix/SynchroComm.hpp"
25 #include "src/simix/SynchroSleep.hpp"
26 #include "src/simix/SynchroIo.hpp"
27 #include "src/simix/SynchroRaw.hpp"
30 #include "src/mc/mc_private.h"
31 #include "src/mc/mc_protocol.h"
32 #include "src/mc/Client.hpp"
35 #include "src/mc/mc_protocol.h"
38 #include "src/mc/mc_record.h"
41 #include "src/smpi/private.h"
44 XBT_LOG_NEW_CATEGORY(simix, "All SIMIX categories");
45 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_kernel, simix, "Logging specific to SIMIX (kernel)");
47 std::unique_ptr<simgrid::simix::Global> simix_global;
48 static xbt_heap_t simix_timers = nullptr;
50 /** @brief Timer datatype */
51 typedef struct s_smx_timer {
53 std::packaged_task<void()> callback;
56 s_smx_timer(double date, std::packaged_task<void()> callback)
57 : date(date), callback(std::move(callback)) {}
60 void (*SMPI_switch_data_segment)(int) = nullptr;
62 int _sg_do_verbose_exit = 1;
63 static void inthandler(int ignored)
65 if ( _sg_do_verbose_exit ) {
66 XBT_INFO("CTRL-C pressed. The current status will be displayed before exit (disable that behavior with option 'verbose-exit').");
67 SIMIX_display_process_status();
70 XBT_INFO("CTRL-C pressed, exiting. Hiding the current process status since '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) {
80 "Access violation detected.\n"
81 "This can result from a programming error in your code or, although less likely,\n"
82 "from a bug in SimGrid itself. This can also be the sign of a bug in the OS or\n"
83 "in third-party libraries. Failing hardware can sometimes generate such errors\n"
85 "Finally, if nothing of the above applies, this can result from a stack overflow.\n"
86 "Try to increase stack size with --cfg=contexts/stack_size (current size is %d KiB).\n",
87 smx_context_stack_size / 1024);
88 if (XBT_LOG_ISENABLED(simix_kernel, xbt_log_priority_debug)) {
90 "siginfo = {si_signo = %d, si_errno = %d, si_code = %d, si_addr = %p}\n",
91 siginfo->si_signo, siginfo->si_errno, siginfo->si_code, siginfo->si_addr);
93 } else if (siginfo->si_signo == SIGSEGV) {
94 fprintf(stderr, "Segmentation fault.\n");
96 if (smpi_enabled() && !smpi_privatize_global_variables) {
97 #if HAVE_PRIVATIZATION
99 "Try to enable SMPI variable privatization with --cfg=smpi/privatize-global-variables:yes.\n");
102 "Sadly, your system does not support --cfg=smpi/privatize-global-variables:yes (yet).\n");
103 #endif /* HAVE_PRIVATIZATION */
105 #endif /* HAVE_SMPI */
110 char sigsegv_stack[SIGSTKSZ]; /* alternate stack for SIGSEGV handler */
113 * Install signal handler for SIGSEGV. Check that nobody has already installed
114 * its own handler. For example, the Java VM does this.
116 static void install_segvhandler(void)
118 stack_t stack, old_stack;
119 stack.ss_sp = sigsegv_stack;
120 stack.ss_size = sizeof sigsegv_stack;
123 if (sigaltstack(&stack, &old_stack) == -1) {
124 XBT_WARN("Failed to register alternate signal stack: %s", strerror(errno));
127 if (!(old_stack.ss_flags & SS_DISABLE)) {
128 XBT_DEBUG("An alternate stack was already installed (sp=%p, size=%zd, flags=%x). Restore it.",
129 old_stack.ss_sp, old_stack.ss_size, old_stack.ss_flags);
130 sigaltstack(&old_stack, nullptr);
133 struct sigaction action, old_action;
134 action.sa_sigaction = &segvhandler;
135 action.sa_flags = SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
136 sigemptyset(&action.sa_mask);
138 if (sigaction(SIGSEGV, &action, &old_action) == -1) {
139 XBT_WARN("Failed to register signal handler for SIGSEGV: %s", strerror(errno));
142 if ((old_action.sa_flags & SA_SIGINFO) || old_action.sa_handler != SIG_DFL) {
143 XBT_DEBUG("A signal handler was already installed for SIGSEGV (%p). Restore it.",
144 (old_action.sa_flags & SA_SIGINFO) ?
145 (void*)old_action.sa_sigaction : (void*)old_action.sa_handler);
146 sigaction(SIGSEGV, &old_action, nullptr);
152 /********************************* SIMIX **************************************/
153 double SIMIX_timer_next(void)
155 return xbt_heap_size(simix_timers) > 0 ? xbt_heap_maxkey(simix_timers) : -1.0;
158 static void kill_process(smx_process_t process)
160 SIMIX_process_kill(process, nullptr);
163 static std::function<void()> maestro_code;
168 XBT_PUBLIC(void) set_maestro(std::function<void()> code)
170 maestro_code = std::move(code);
176 void SIMIX_set_maestro(void (*code)(void*), void* data)
178 maestro_code = std::bind(code, data);
183 * \brief Initialize SIMIX internal data.
188 void SIMIX_global_init(int *argc, char **argv)
191 // The communication initialization is done ASAP.
192 // We need to communicate initialization of the different layers to the model-checker.
193 simgrid::mc::Client::initialize();
197 simix_global = std::unique_ptr<simgrid::simix::Global>(new simgrid::simix::Global());
199 simgrid::simix::Process proc;
200 simix_global->process_to_run = xbt_dynar_new(sizeof(smx_process_t), nullptr);
201 simix_global->process_that_ran = xbt_dynar_new(sizeof(smx_process_t), nullptr);
202 simix_global->process_list = xbt_swag_new(xbt_swag_offset(proc, process_hookup));
203 simix_global->process_to_destroy = xbt_swag_new(xbt_swag_offset(proc, destroy_hookup));
204 simix_global->maestro_process = nullptr;
205 simix_global->create_process_function = &SIMIX_process_create;
206 simix_global->kill_process_function = &kill_process;
207 simix_global->cleanup_process_function = &SIMIX_process_cleanup;
208 simix_global->mutex = xbt_os_mutex_init();
210 surf_init(argc, argv); /* Initialize SURF structures */
211 SIMIX_context_mod_init();
213 // Either create a new context with maestro or create
214 // a context object with the current context mestro):
215 simgrid::simix::create_maestro(maestro_code);
217 /* Prepare to display some more info when dying on Ctrl-C pressing */
218 signal(SIGINT, inthandler);
221 install_segvhandler();
223 /* register a function to be called by SURF after the environment creation */
225 simgrid::surf::on_postparse.connect(SIMIX_post_create_environment);
226 simgrid::s4u::Host::onCreation.connect([](simgrid::s4u::Host& host) {
227 SIMIX_host_create(&host);
229 SIMIX_HOST_LEVEL = simgrid::s4u::Host::extension_create(SIMIX_host_destroy);
231 simgrid::surf::storageCreatedCallbacks.connect([](simgrid::surf::Storage* storage) {
232 const char* name = storage->getName();
233 // TODO, create sg_storage_by_name
234 sg_storage_t s = xbt_lib_get_elm_or_null(storage_lib, name);
235 xbt_assert(s != nullptr, "Storage not found for name %s", name);
237 SIMIX_storage_create(name, s, nullptr);
240 SIMIX_STORAGE_LEVEL = xbt_lib_add_level(storage_lib, SIMIX_storage_destroy);
243 simix_timers = xbt_heap_new(8, [](void* p) {
244 delete static_cast<smx_timer_t>(p);
247 if (xbt_cfg_get_boolean("clean-atexit"))
250 if (_sg_cfg_exit_asap)
257 * \brief Clean the SIMIX simulation
259 * This functions remove the memory used by SIMIX
261 void SIMIX_clean(void)
263 if (smx_cleaned) return; // to avoid double cleaning by java and C
266 if (SIMIX_process_count()>0){
267 if(smpi_process_initialized()){
268 xbt_die("Process exited without calling MPI_Finalize - Killing simulation");
270 XBT_WARN("Process called exit when leaving - Skipping cleanups");
277 XBT_DEBUG("SIMIX_clean called. Simulation's over.");
278 if (!xbt_dynar_is_empty(simix_global->process_to_run) && SIMIX_get_clock() == 0.0) {
280 XBT_CRITICAL("The time is still 0, and you still have processes ready to run.");
281 XBT_CRITICAL("It seems that you forgot to run the simulation that you setup.");
282 xbt_die("Bailing out to avoid that stop-before-start madness. Please fix your code.");
284 /* Kill all processes (but maestro) */
285 SIMIX_process_killall(simix_global->maestro_process, 1);
287 /* Exit the SIMIX network module */
288 SIMIX_mailbox_exit();
290 xbt_heap_free(simix_timers);
291 simix_timers = nullptr;
292 /* Free the remaining data structures */
293 xbt_dynar_free(&simix_global->process_to_run);
294 xbt_dynar_free(&simix_global->process_that_ran);
295 xbt_swag_free(simix_global->process_to_destroy);
296 xbt_swag_free(simix_global->process_list);
297 simix_global->process_list = nullptr;
298 simix_global->process_to_destroy = nullptr;
300 xbt_os_mutex_destroy(simix_global->mutex);
301 simix_global->mutex = nullptr;
303 /* Let's free maestro now */
304 delete simix_global->maestro_process->context;
305 simix_global->maestro_process->context = nullptr;
306 delete simix_global->maestro_process;
307 simix_global->maestro_process = nullptr;
309 /* Finish context module and SURF */
310 SIMIX_context_mod_exit();
314 simix_global = nullptr;
321 * \brief A clock (in second).
323 * \return Return the clock.
325 double SIMIX_get_clock(void)
327 if(MC_is_active() || MC_record_replay_is_active()){
328 return MC_process_clock_get(SIMIX_process_self());
330 return surf_get_clock();
334 static int process_syscall_color(void *p)
336 switch ((*(smx_process_t *)p)->simcall.call) {
338 case SIMCALL_PROCESS_KILL:
340 case SIMCALL_PROCESS_RESUME:
349 * \brief Run the main simulation loop.
353 if (MC_record_path) {
354 simgrid::mc::replay(MC_record_path);
359 smx_process_t process;
360 surf_action_t action;
366 XBT_DEBUG("New Schedule Round; size(queue)=%lu",
367 xbt_dynar_length(simix_global->process_to_run));
368 while (!xbt_dynar_is_empty(simix_global->process_to_run)) {
369 XBT_DEBUG("New Sub-Schedule Round; size(queue)=%lu",
370 xbt_dynar_length(simix_global->process_to_run));
372 /* Run all processes that are ready to run, possibly in parallel */
373 SIMIX_process_runall();
375 /* Move all killer processes to the end of the list, because killing a process that have an ongoing simcall is a bad idea */
376 xbt_dynar_three_way_partition(simix_global->process_that_ran, process_syscall_color);
378 /* answer sequentially and in a fixed arbitrary order all the simcalls that were issued during that sub-round */
380 /* WARNING, the order *must* be fixed or you'll jeopardize the simulation reproducibility (see RR-7653) */
382 /* Here, the order is ok because:
384 * Short proof: only maestro adds stuff to the process_to_run array, so the execution order of user contexts do not impact its order.
386 * Long proof: processes remain sorted through an arbitrary (implicit, complex but fixed) order in all cases.
388 * - if there is no kill during the simulation, processes remain sorted according by their PID.
389 * rational: This can be proved inductively.
390 * Assume that process_to_run is sorted at a beginning of one round (it is at round 0: the deployment file is parsed linearly).
391 * Let's show that it is still so at the end of this round.
392 * - if a process is added when being created, that's from maestro. It can be either at startup
393 * time (and then in PID order), or in response to a process_create simcall. Since simcalls are handled
394 * in arbitrary order (inductive hypothesis), we are fine.
395 * - If a process is added because it's getting killed, its subsequent actions shouldn't matter
396 * - If a process gets added to process_to_run because one of their blocking action constituting the meat
397 * of a simcall terminates, we're still good. Proof:
398 * - You are added from SIMIX_simcall_answer() only. When this function is called depends on the resource
399 * kind (network, cpu, disk, whatever), but the same arguments hold. Let's take communications as an example.
400 * - For communications, this function is called from SIMIX_comm_finish().
401 * This function itself don't mess with the order since simcalls are handled in FIFO order.
402 * The function is called:
403 * - before the comm starts (invalid parameters, or resource already dead or whatever).
404 * The order then trivial holds since maestro didn't interrupt its handling of the simcall yet
405 * - because the communication failed or were canceled after startup. In this case, it's called from the function
406 * we are in, by the chunk:
407 * set = model->states.failed_action_set;
408 * while ((synchro = xbt_swag_extract(set)))
409 * SIMIX_simcall_post((smx_synchro_t) synchro->data);
410 * This order is also fixed because it depends of the order in which the surf actions were
411 * added to the system, and only maestro can add stuff this way, through simcalls.
412 * We thus use the inductive hypothesis once again to conclude that the order in which synchros are
413 * poped out of the swag does not depend on the user code's execution order.
414 * - because the communication terminated. In this case, synchros are served in the order given by
415 * set = model->states.done_action_set;
416 * while ((synchro = xbt_swag_extract(set)))
417 * SIMIX_simcall_post((smx_synchro_t) synchro->data);
418 * and the argument is very similar to the previous one.
419 * So, in any case, the orders of calls to SIMIX_comm_finish() do not depend on the order in which user processes are executed.
420 * So, in any cases, the orders of processes within process_to_run do not depend on the order in which user processes were executed previously.
421 * So, if there is no killing in the simulation, the simulation reproducibility is not jeopardized.
422 * - If there is some process killings, the order is changed by this decision that comes from user-land
423 * But this decision may not have been motivated by a situation that were different because the simulation is not reproducible.
424 * So, even the order change induced by the process killing is perfectly reproducible.
426 * So science works, bitches [http://xkcd.com/54/].
428 * We could sort the process_that_ran array completely so that we can describe the order in which simcalls are handled
429 * (like "according to the PID of issuer"), but it's not mandatory (order is fixed already even if unfriendly).
430 * That would thus be a pure waste of time.
433 xbt_dynar_foreach(simix_global->process_that_ran, iter, process) {
434 if (process->simcall.call != SIMCALL_NONE) {
435 SIMIX_simcall_handle(&process->simcall, 0);
438 /* Wake up all processes waiting for a Surf action to finish */
439 xbt_dynar_foreach(all_existing_models, iter, model) {
440 XBT_DEBUG("Handling process whose action failed");
441 while ((action = surf_model_extract_failed_action_set(model))) {
442 XBT_DEBUG(" Handling Action %p",action);
443 SIMIX_simcall_exit((smx_synchro_t) action->getData());
445 XBT_DEBUG("Handling process whose action terminated normally");
446 while ((action = surf_model_extract_done_action_set(model))) {
447 XBT_DEBUG(" Handling Action %p",action);
448 if (action->getData() == nullptr)
449 XBT_DEBUG("probably vcpu's action %p, skip", action);
451 SIMIX_simcall_exit((smx_synchro_t) action->getData());
456 time = SIMIX_timer_next();
457 if (time != -1.0 || xbt_swag_size(simix_global->process_list) != 0) {
458 XBT_DEBUG("Calling surf_solve");
459 time = surf_solve(time);
460 XBT_DEBUG("Moving time ahead : %g", time);
462 /* Notify all the hosts that have failed */
463 /* FIXME: iterate through the list of failed host and mark each of them */
464 /* as failed. On each host, signal all the running processes with host_fail */
466 /* Handle any pending timer */
467 while (xbt_heap_size(simix_timers) > 0 && SIMIX_get_clock() >= SIMIX_timer_next()) {
468 //FIXME: make the timers being real callbacks
469 // (i.e. provide dispatchers that read and expand the args)
470 timer = (smx_timer_t) xbt_heap_pop(simix_timers);
475 xbt_die("Exception throwed ouf of timer callback");
480 /* Wake up all processes waiting for a Surf action to finish */
481 xbt_dynar_foreach(all_existing_models, iter, model) {
482 XBT_DEBUG("Handling process whose action failed");
483 while ((action = surf_model_extract_failed_action_set(model))) {
484 XBT_DEBUG(" Handling Action %p",action);
485 SIMIX_simcall_exit((smx_synchro_t) action->getData());
487 XBT_DEBUG("Handling process whose action terminated normally");
488 while ((action = surf_model_extract_done_action_set(model))) {
489 XBT_DEBUG(" Handling Action %p",action);
490 if (action->getData() == nullptr)
491 XBT_DEBUG("probably vcpu's action %p, skip", action);
493 SIMIX_simcall_exit((smx_synchro_t) action->getData());
497 /* Autorestart all process */
498 char *hostname = nullptr;
499 xbt_dynar_foreach(host_that_restart,iter,hostname) {
500 XBT_INFO("Restart processes on host: %s",hostname);
501 SIMIX_host_autorestart(sg_host_by_name(hostname));
503 xbt_dynar_reset(host_that_restart);
505 /* Clean processes to destroy */
506 SIMIX_process_empty_trash();
509 XBT_DEBUG("### time %f, empty %d", time, xbt_dynar_is_empty(simix_global->process_to_run));
511 } while (time != -1.0 || !xbt_dynar_is_empty(simix_global->process_to_run));
513 if (xbt_swag_size(simix_global->process_list) != 0) {
517 XBT_CRITICAL("Oops ! Deadlock or code not perfectly clean.");
518 SIMIX_display_process_status();
524 * \brief Set the date to execute a function
526 * Set the date to execute the function on the surf.
527 * \param date Date to execute function
528 * \param function Function to be executed
529 * \param arg Parameters of the function
532 smx_timer_t SIMIX_timer_set(double date, void (*function)(void*), void *arg)
534 smx_timer_t timer = new s_smx_timer_t(date,
535 std::packaged_task<void()>(std::bind(function, arg)));
536 xbt_heap_push(simix_timers, timer, date);
540 smx_timer_t SIMIX_timer_set(double date, std::packaged_task<void()> callback)
542 smx_timer_t timer = new s_smx_timer_t(date, std::move(callback));
543 xbt_heap_push(simix_timers, timer, date);
547 /** @brief cancels a timer that was added earlier */
548 void SIMIX_timer_remove(smx_timer_t timer) {
549 xbt_heap_rm_elm(simix_timers, timer, timer->date);
552 /** @brief Returns the date at which the timer will trigger (or 0 if nullptr timer) */
553 double SIMIX_timer_get_date(smx_timer_t timer) {
554 return timer?timer->date:0;
558 * \brief Registers a function to create a process.
560 * This function registers a function to be called
561 * when a new process is created. The function has
562 * to call SIMIX_process_create().
563 * \param function create process function
565 void SIMIX_function_register_process_create(smx_creation_func_t function)
567 simix_global->create_process_function = function;
571 * \brief Registers a function to kill a process.
573 * This function registers a function to be called when a
574 * process is killed. The function has to call the SIMIX_process_kill().
576 * \param function Kill process function
578 void SIMIX_function_register_process_kill(void_pfn_smxprocess_t
581 simix_global->kill_process_function = function;
585 * \brief Registers a function to cleanup a process.
587 * This function registers a user function to be called when
588 * a process ends properly.
590 * \param function cleanup process function
592 void SIMIX_function_register_process_cleanup(void_pfn_smxprocess_t
595 simix_global->cleanup_process_function = function;
599 void SIMIX_display_process_status(void)
601 if (simix_global->process_list == nullptr) {
605 smx_process_t process = nullptr;
606 int nbprocess = xbt_swag_size(simix_global->process_list);
608 XBT_INFO("%d processes are still running, waiting for something.", nbprocess);
609 /* List the process and their state */
611 ("Legend of the following listing: \"Process <pid> (<name>@<host>): <status>\"");
612 xbt_swag_foreach(process, simix_global->process_list) {
614 if (process->waiting_synchro) {
616 const char* synchro_description = "unknown";
618 if (dynamic_cast<simgrid::simix::Exec*>(process->waiting_synchro) != nullptr)
619 synchro_description = "execution";
621 if (dynamic_cast<simgrid::simix::Comm*>(process->waiting_synchro) != nullptr)
622 synchro_description = "communication";
624 if (dynamic_cast<simgrid::simix::Sleep*>(process->waiting_synchro) != nullptr)
625 synchro_description = "sleeping";
627 if (dynamic_cast<simgrid::simix::Raw*>(process->waiting_synchro) != nullptr)
628 synchro_description = "synchronization";
630 if (dynamic_cast<simgrid::simix::Io*>(process->waiting_synchro) != nullptr)
631 synchro_description = "I/O";
635 switch (process->waiting_synchro->type) {
636 case SIMIX_SYNC_PARALLEL_EXECUTE:
637 synchro_description = "parallel execution";
640 case SIMIX_SYNC_JOIN:
641 synchro_description = "joining";
645 XBT_INFO("Process %lu (%s@%s): waiting for %s synchro %p (%s) in state %d to finish",
646 process->pid, process->name.c_str(), sg_host_get_name(process->host),
647 synchro_description, process->waiting_synchro,
648 process->waiting_synchro->name.c_str(), (int)process->waiting_synchro->state);
651 XBT_INFO("Process %lu (%s@%s)", process->pid, process->name.c_str(), sg_host_get_name(process->host));
656 xbt_dict_t simcall_HANDLER_asr_get_properties(smx_simcall_t simcall, const char *name){
657 return SIMIX_asr_get_properties(name);
659 xbt_dict_t SIMIX_asr_get_properties(const char *name)
661 return (xbt_dict_t) xbt_lib_get_or_null(as_router_lib, name, ROUTING_PROP_ASR_LEVEL);
664 int SIMIX_is_maestro()
666 return simix_global==nullptr /*SimDag*/|| SIMIX_process_self() == simix_global->maestro_process;