X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ceaf8b82812aa8d58495687482fc6d4995119934..d2cc5a5e537a7b2915f781dd75ad8f4d02f6fcf7:/src/mc/mc_base.cpp?ds=sidebyside diff --git a/src/mc/mc_base.cpp b/src/mc/mc_base.cpp index 384501de4d..2a6b270e5e 100644 --- a/src/mc/mc_base.cpp +++ b/src/mc/mc_base.cpp @@ -1,17 +1,20 @@ -/* Copyright (c) 2008-2017. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2008-2019. 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 "mc/mc.h" #include "src/mc/mc_base.h" -#include "src/mc/mc_replay.h" -#include "src/simix/smx_private.h" +#include "mc/mc.h" +#include "src/kernel/activity/CommImpl.hpp" +#include "src/kernel/activity/MutexImpl.hpp" +#include "src/mc/mc_replay.hpp" +#include "src/simix/smx_private.hpp" + +#include #if SIMGRID_HAVE_MC #include "src/mc/ModelChecker.hpp" +#include "src/mc/remote/RemoteClient.hpp" using simgrid::mc::remote; #endif @@ -33,69 +36,138 @@ namespace mc { void wait_for_requests() { #if SIMGRID_HAVE_MC - xbt_assert(mc_model_checker == nullptr); + xbt_assert(mc_model_checker == nullptr, "This must be called from the client"); #endif - - smx_actor_t process; - smx_simcall_t req; - unsigned int iter; - - while (not 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; + while (not simix_global->actors_to_run.empty()) { + simix_global->run_all_actors(); + for (smx_actor_t const& process : simix_global->actors_that_ran) { + smx_simcall_t req = &process->simcall; if (req->call != SIMCALL_NONE && not simgrid::mc::request_is_visible(req)) - SIMIX_simcall_handle(req, 0); + process->simcall_handle(0); } } #if SIMGRID_HAVE_MC xbt_dynar_reset(simix_global->actors_vector); - for (std::pair kv : simix_global->process_list) { + for (std::pair const& kv : simix_global->process_list) { xbt_dynar_push_as(simix_global->actors_vector, smx_actor_t, kv.second); } #endif } - -bool request_is_visible(smx_simcall_t req) +/** @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: +bool actor_is_enabled(smx_actor_t actor) { - 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 - ; -} +#if SIMGRID_HAVE_MC + // If in the MCer, ask the client app since it has all the data + if (mc_model_checker != nullptr) { + return mc_model_checker->process().actor_is_enabled(actor->get_pid()); + } +#endif -} + // Now, we are in the client app, no need for remote memory reading. + smx_simcall_t req = &actor->simcall; + + if (req->transition != nullptr) + return req->transition->fireable(); + + switch (req->call) { + case SIMCALL_NONE: + return false; + + case SIMCALL_COMM_WAIT: { + /* FIXME: check also that src and dst processes are not suspended */ + simgrid::kernel::activity::CommImpl* act = + static_cast(simcall_comm_wait__getraw__comm(req)); + + 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.*/ + 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_); + } + + 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* comm = comms[index]; + if (comm->src_actor_ && comm->dst_actor_) + return true; + } + return false; + } + + case SIMCALL_MUTEX_LOCK: { + smx_mutex_t mutex = simcall_mutex_lock__get__mutex(req); + + if (mutex->owner_ == nullptr) + return true; + return mutex->owner_->get_pid() == req->issuer->get_pid(); + } + + 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; + } } -static int prng_random(int min, int max) +/* 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(smx_simcall_t req) { - 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 _WIN32 - x = (unsigned long) random(); -#else - x = (unsigned long) rand(); +#if SIMGRID_HAVE_MC + xbt_assert(mc_model_checker == nullptr, "This should be called from the client side"); #endif - } while( x >= accept_size ); - return min + (x % output_size); + + return (req->transition != nullptr && req->transition->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 (not MC_is_active() && not MC_record_path) - return prng_random(min, max); + if (not MC_is_active() && MC_record_path.empty()) { + static std::default_random_engine rnd_engine; + std::uniform_int_distribution prng(min, max); + return prng(rnd_engine); + } return simcall->mc_value; }