X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/3203ed1f4fb6f4617e94d5351661ba07e8b8f833..39c935d6d5ee86d153f6f7e6a10d723ae7c57f6f:/src/mc/mc_base.cpp diff --git a/src/mc/mc_base.cpp b/src/mc/mc_base.cpp index ea5b647c3d..6b498b61c5 100644 --- a/src/mc/mc_base.cpp +++ b/src/mc/mc_base.cpp @@ -1,245 +1,178 @@ -/* Copyright (c) 2008-2015. The SimGrid Team. - * All rights reserved. */ +/* Copyright (c) 2008-2021. The SimGrid Team. All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ -#include - -#include - -#include "mc_base.h" -#include "src/simix/smx_private.h" -#include "src/mc/mc_record.h" -#include "src/mc/mc_replay.h" +#include "src/mc/mc_base.h" #include "mc/mc.h" -#include "mc_protocol.h" +#include "src/kernel/activity/CommImpl.hpp" +#include "src/kernel/activity/MutexImpl.hpp" +#include "src/mc/checker/SimcallInspector.hpp" +#include "src/mc/mc_replay.hpp" +#include "src/simix/smx_private.hpp" + +#include "xbt/random.hpp" -#ifdef HAVE_MC -#include "src/mc/Process.hpp" +#if SIMGRID_HAVE_MC #include "src/mc/ModelChecker.hpp" -#include "mc_smx.h" -#include "mc_server.h" -#endif +#include "src/mc/Session.hpp" +#include "src/mc/remote/RemoteSimulation.hpp" -#ifdef HAVE_MC using simgrid::mc::remote; #endif -extern "C" { - -XBT_LOG_NEW_CATEGORY(mc, "All MC categories"); +XBT_LOG_NEW_DEFAULT_CATEGORY(mc, "All MC categories"); int MC_random(int min, int max) { - xbt_assert(mc_mode != MC_MODE_SERVER); - /* TODO, if the MC is disabled we do not really need to make a simcall for - * this :) */ - /* FIXME: return mc_current_state->executed_transition->random.value; */ +#if SIMGRID_HAVE_MC + xbt_assert(mc_model_checker == nullptr); +#endif + /* TODO, if the MC is disabled we do not really need to make a simcall for this :) */ return simcall_mc_random(min, max); } -void MC_wait_for_requests(void) +namespace simgrid { +namespace mc { + +void wait_for_requests() { -#ifdef HAVE_MC - if (mc_mode == MC_MODE_SERVER) { - MC_server_wait_client(&mc_model_checker->process()); - return; - } +#if SIMGRID_HAVE_MC + xbt_assert(mc_model_checker == nullptr, "This must be called from the client"); #endif - - smx_process_t process; - smx_simcall_t req; - unsigned int iter; - - while (!xbt_dynar_is_empty(simix_global->process_to_run)) { - SIMIX_process_runall(); - xbt_dynar_foreach(simix_global->process_that_ran, iter, process) { - req = &process->simcall; - if (req->call != SIMCALL_NONE && !MC_request_is_visible(req)) - SIMIX_simcall_handle(req, 0); + while (not simix_global->actors_to_run.empty()) { + simix_global->run_all_actors(); + for (smx_actor_t const& process : simix_global->actors_that_ran) { + const s_smx_simcall* req = &process->simcall_; + if (req->call_ != simix::Simcall::NONE && not simgrid::mc::request_is_visible(req)) + process->simcall_handle(0); } } +#if SIMGRID_HAVE_MC + xbt_dynar_reset(simix_global->actors_vector); + for (std::pair const& kv : simix_global->process_list) { + xbt_dynar_push_as(simix_global->actors_vector, smx_actor_t, kv.second); + } +#endif } +/** @brief returns if there this transition can proceed in a finite amount of time + * + * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition. + * + * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration. + * Wait operations are OK and return true in only two situations: + * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available) + * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this + * transition for ever. + * + */ // Called from both MCer and MCed: -int MC_request_is_enabled(smx_simcall_t req) +bool actor_is_enabled(smx_actor_t actor) { - unsigned int index = 0; - smx_synchro_t act = 0; -#ifdef HAVE_MC - s_smx_synchro_t temp_synchro; +// #del +#if SIMGRID_HAVE_MC + // If in the MCer, ask the client app since it has all the data + if (mc_model_checker != nullptr) { + return simgrid::mc::session->actor_is_enabled(actor->get_pid()); + } #endif +// # - switch (req->call) { - case SIMCALL_NONE: - return FALSE; + // Now, we are in the client app, no need for remote memory reading. + smx_simcall_t req = &actor->simcall_; - case SIMCALL_COMM_WAIT: - /* FIXME: check also that src and dst processes are not suspended */ - act = simcall_comm_wait__get__comm(req); + if (req->inspector_ != nullptr) + return req->inspector_->is_enabled(); -#ifdef HAVE_MC - // Fetch from MCed memory: - if (mc_mode == MC_MODE_SERVER) { - mc_model_checker->process().read(&temp_synchro, remote(act)); - act = &temp_synchro; - } -#endif + using simix::Simcall; + switch (req->call_) { + case Simcall::NONE: + return false; + + case Simcall::COMM_WAIT: { + /* FIXME: check also that src and dst processes are not suspended */ + const kernel::activity::CommImpl* act = simcall_comm_wait__getraw__comm(req); - if (simcall_comm_wait__get__timeout(req) >= 0) { - /* If it has a timeout it will be always be enabled, because even if the - * communication is not ready, it can timeout and won't block. */ - if (_sg_mc_timeout == 1) - return TRUE; - } else { + if (act->src_timeout_ || act->dst_timeout_) { + /* If it has a timeout it will be always be enabled (regardless of who declared the timeout), + * because even if the communication is not ready, it can timeout and won't block. */ + if (_sg_mc_timeout == 1) + return true; + } /* On the other hand if it hasn't a timeout, check if the comm is ready.*/ - if (act->comm.detached && act->comm.src_proc == NULL - && act->comm.type == SIMIX_COMM_READY) - return (act->comm.dst_proc != NULL); + else if (act->detached() && act->src_actor_ == nullptr && + act->type_ == simgrid::kernel::activity::CommImpl::Type::READY) + return (act->dst_actor_ != nullptr); + return (act->src_actor_ && act->dst_actor_); } - return (act->comm.src_proc && act->comm.dst_proc); - - case SIMCALL_COMM_WAITANY: { - xbt_dynar_t comms; -#ifdef HAVE_MC - - s_xbt_dynar_t comms_buffer; - size_t buffer_size = 0; - if (mc_mode == MC_MODE_SERVER) { - // Read dynar: - mc_model_checker->process().read( - &comms_buffer, remote(simcall_comm_waitany__get__comms(req))); - assert(comms_buffer.elmsize == sizeof(act)); - buffer_size = comms_buffer.elmsize * comms_buffer.used; - comms = &comms_buffer; - } else { - comms = simcall_comm_waitany__get__comms(req); - } - // Read all the dynar buffer: - char buffer[buffer_size]; - if (mc_mode == MC_MODE_SERVER) - mc_model_checker->process().read_bytes(buffer, sizeof(buffer), - remote(comms->data)); -#else - comms = simcall_comm_waitany__get__comms(req); -#endif - for (index = 0; index < comms->used; ++index) { -#ifdef HAVE_MC - // Fetch act from MCed memory: - if (mc_mode == MC_MODE_SERVER) { - memcpy(&act, buffer + comms->elmsize * index, sizeof(act)); - mc_model_checker->process().read(&temp_synchro, remote(act)); - act = &temp_synchro; + case Simcall::COMM_WAITANY: { + simgrid::kernel::activity::CommImpl** comms = simcall_comm_waitany__get__comms(req); + size_t count = simcall_comm_waitany__get__count(req); + for (unsigned int index = 0; index < count; ++index) { + auto const* comm = comms[index]; + if (comm->src_actor_ && comm->dst_actor_) + return true; } - else -#endif - act = xbt_dynar_get_as(comms, index, smx_synchro_t); - if (act->comm.src_proc && act->comm.dst_proc) - return TRUE; + return false; } - return FALSE; - } - case SIMCALL_MUTEX_TRYLOCK: - return TRUE; + case Simcall::MUTEX_LOCK: { + const kernel::activity::MutexImpl* mutex = simcall_mutex_lock__get__mutex(req); - case SIMCALL_MUTEX_LOCK: { - smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req); -#ifdef HAVE_MC - s_smx_mutex_t temp_mutex; - if (mc_mode == MC_MODE_SERVER) { - mc_model_checker->process().read(&temp_mutex, remote(mutex)); - mutex = &temp_mutex; + if (mutex->get_owner() == nullptr) + return true; + return mutex->get_owner()->get_pid() == req->issuer_->get_pid(); } -#endif - if(mutex->owner == NULL) - return TRUE; - else -#ifdef HAVE_MC - // TODO, *(mutex->owner) :/ - return MC_smx_resolve_process(mutex->owner)->pid == - MC_smx_resolve_process(req->issuer)->pid; -#else - return mutex->owner->pid == req->issuer->pid; -#endif + + case Simcall::SEM_ACQUIRE: { + static int warned = 0; + if (not warned) + XBT_INFO("Using semaphore in model-checked code is still experimental. Use at your own risk"); + warned = 1; + return true; + } + + case Simcall::COND_WAIT: { + static int warned = 0; + if (not warned) + XBT_INFO("Using condition variables in model-checked code is still experimental. Use at your own risk"); + warned = 1; + return true; } - default: - /* The rest of the requests are always enabled */ - return TRUE; + default: + /* The rest of the requests are always enabled */ + return true; } } -int MC_request_is_visible(smx_simcall_t req) +/* This is the list of requests that are visible from the checker algorithm. + * Any other requests are handled right away on the application side. + */ +bool request_is_visible(const s_smx_simcall* req) { - return req->call == SIMCALL_COMM_ISEND - || req->call == SIMCALL_COMM_IRECV - || req->call == SIMCALL_COMM_WAIT - || req->call == SIMCALL_COMM_WAITANY - || req->call == SIMCALL_COMM_TEST - || req->call == SIMCALL_COMM_TESTANY - || req->call == SIMCALL_MC_RANDOM - || req->call == SIMCALL_MUTEX_LOCK - || req->call == SIMCALL_MUTEX_TRYLOCK -#ifdef HAVE_MC - || req->call == SIMCALL_MC_SNAPSHOT - || req->call == SIMCALL_MC_COMPARE_SNAPSHOTS +#if SIMGRID_HAVE_MC + xbt_assert(mc_model_checker == nullptr, "This should be called from the client side"); #endif - ; -} -static int prng_random(int min, int max) -{ - unsigned long output_size = ((unsigned long) max - (unsigned long) min) + 1; - unsigned long input_size = (unsigned long) RAND_MAX + 1; - unsigned long reject_size = input_size % output_size; - unsigned long accept_size = input_size - reject_size; // module*accept_size - - // Use rejection in order to avoid skew - unsigned long x; - do { -#ifndef _XBT_WIN32 - x = (unsigned long) random(); -#else - x = (unsigned long) rand(); -#endif - } while( x >= accept_size ); - return min + (x % output_size); + using simix::Simcall; + return (req->inspector_ != nullptr && req->inspector_->is_visible()) || req->call_ == Simcall::COMM_ISEND || + req->call_ == Simcall::COMM_IRECV || req->call_ == Simcall::COMM_WAIT || req->call_ == Simcall::COMM_WAITANY || + req->call_ == Simcall::COMM_TEST || req->call_ == Simcall::COMM_TESTANY || req->call_ == Simcall::MC_RANDOM || + req->call_ == Simcall::MUTEX_LOCK || req->call_ == Simcall::MUTEX_TRYLOCK || + req->call_ == Simcall::MUTEX_UNLOCK; } -int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max) -{ - if (!MC_is_active() && !MC_record_path){ - return prng_random(min, max); - } - - return simcall->mc_value; +} } -void MC_simcall_handle(smx_simcall_t req, int value) +int simcall_HANDLER_mc_random(smx_simcall_t simcall, int min, int max) { -#ifndef HAVE_MC - SIMIX_simcall_handle(req, value); -#else - if (mc_mode == MC_MODE_CLIENT) { - SIMIX_simcall_handle(req, value); - return; - } - - unsigned i; - mc_smx_process_info_t pi = NULL; - - xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, i, pi) { - if (req == &pi->copy.simcall) { - MC_server_simcall_handle(&mc_model_checker->process(), pi->copy.pid, value); - return; - } + if (not MC_is_active() && MC_record_path.empty()) { + static simgrid::xbt::random::XbtRandom prng; + return prng.uniform_int(min, max); } - - xbt_die("Could not find the request"); -#endif -} - + return simcall->mc_value_; }