X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/61dfc53a25f7b7e63a1e13fe7126f3cf735d5e52..cc309f0bc25802386a5f6d8bf2cfc487139ca1e3:/src/mc/Session.cpp diff --git a/src/mc/Session.cpp b/src/mc/Session.cpp index 8079ed7f96..3e0fb61293 100644 --- a/src/mc/Session.cpp +++ b/src/mc/Session.cpp @@ -1,31 +1,39 @@ -/* Copyright (c) 2015-2020. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2015-2022. 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 "src/mc/Session.hpp" -#include "src/mc/checker/Checker.hpp" -#include "src/mc/mc_config.hpp" #include "src/internal_config.h" // HAVE_SMPI +#include "src/mc/explo/Exploration.hpp" +#include "src/mc/mc_config.hpp" #if HAVE_SMPI #include "smpi/smpi.h" +#include "src/smpi/include/private.hpp" #endif +#include "src/mc/api/State.hpp" +#include "src/mc/mc_exit.hpp" #include "src/mc/mc_private.hpp" -#include "src/mc/mc_state.hpp" #include "xbt/log.h" #include "xbt/system_error.hpp" +#include "signal.h" +#include +#include +#include + #include #ifdef __linux__ #include #endif XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_Session, mc, "Model-checker session"); +XBT_LOG_EXTERNAL_CATEGORY(mc_global); namespace simgrid { namespace mc { -static void setup_child_environment(int socket) +template void run_child_process(int socket, Code code) { /* On startup, simix_global_init() calls simgrid::mc::Client::initialize(), which checks whether the MC_ENV_SOCKET_FD * env variable is set. If so, MC mode is assumed, and the client is setup from its side @@ -44,17 +52,13 @@ static void setup_child_environment(int socket) xbt_assert(fdflags != -1 && fcntl(socket, F_SETFD, fdflags & ~FD_CLOEXEC) != -1, "Could not remove CLOEXEC for socket"); - // Set environment so that mmalloc gets used in application - setenv(MC_ENV_VARIABLE, "1", 1); - // Disable lazy relocation in the model-checked process to prevent the application from // modifying its .got.plt during snapshot. setenv("LC_BIND_NOW", "1", 1); - char buffer[64]; - int res = std::snprintf(buffer, sizeof(buffer), "%i", socket); - xbt_assert((size_t)res < sizeof(buffer) && res != -1); - setenv(MC_ENV_SOCKET_FD, buffer, 1); + setenv(MC_ENV_SOCKET_FD, std::to_string(socket).c_str(), 1); + + code(); } Session::Session(const std::function& code) @@ -65,21 +69,19 @@ Session::Session(const std::function& code) "Please use the dlopen privatization schema when model-checking SMPI code"); #endif - // Create a AF_LOCAL socketpair used for exchanging messages + // Create an AF_LOCAL socketpair used for exchanging messages // between the model-checker process (ourselves) and the model-checked // process: int sockets[2]; - int res = socketpair(AF_LOCAL, SOCK_SEQPACKET | SOCK_CLOEXEC, 0, sockets); - xbt_assert(res != -1, "Could not create socketpair"); + xbt_assert(socketpair(AF_LOCAL, SOCK_SEQPACKET | SOCK_CLOEXEC, 0, sockets) != -1, "Could not create socketpair"); pid_t pid = fork(); xbt_assert(pid >= 0, "Could not fork model-checked process"); if (pid == 0) { // Child ::close(sockets[1]); - setup_child_environment(sockets[0]); - code(); - xbt_die("The model-checked process failed to exec(): %s", strerror(errno)); + run_child_process(sockets[0], code); + DIE_IMPOSSIBLE; } // Parent (model-checker): @@ -87,11 +89,11 @@ Session::Session(const std::function& code) xbt_assert(mc_model_checker == nullptr, "Did you manage to start the MC twice in this process?"); - std::unique_ptr process(new simgrid::mc::RemoteClient(pid, sockets[1])); - model_checker_.reset(new simgrid::mc::ModelChecker(std::move(process))); + auto process = std::make_unique(pid); + model_checker_ = std::make_unique(std::move(process), sockets[1]); mc_model_checker = model_checker_.get(); - mc_model_checker->start(); + model_checker_->start(); } Session::~Session() @@ -99,28 +101,22 @@ Session::~Session() this->close(); } -/** Take the initial snapshot of the application, that must be stopped. */ -void Session::initialize() +/** The application must be stopped. */ +void Session::take_initial_snapshot() { xbt_assert(initial_snapshot_ == nullptr); - mc_model_checker->wait_for_requests(); - initial_snapshot_ = std::make_shared(0); -} - -void Session::execute(Transition const& transition) -{ - model_checker_->handle_simcall(transition); model_checker_->wait_for_requests(); + initial_snapshot_ = std::make_shared(0); } -void Session::restore_initial_state() +void Session::restore_initial_state() const { - this->initial_snapshot_->restore(&mc_model_checker->process()); + this->initial_snapshot_->restore(&model_checker_->get_remote_process()); } -void Session::log_state() +void Session::log_state() const { - mc_model_checker->getChecker()->log_state(); + model_checker_->get_exploration()->log_state(); if (not _sg_mc_dot_output_file.get().empty()) { fprintf(dot_output, "}\n"); @@ -143,7 +139,42 @@ void Session::close() } } -simgrid::mc::Session* session; +bool Session::actor_is_enabled(aid_t pid) const +{ + s_mc_message_actor_enabled_t msg; + memset(&msg, 0, sizeof msg); + msg.type = simgrid::mc::MessageType::ACTOR_ENABLED; + msg.aid = pid; + model_checker_->channel().send(msg); + std::array buff; + ssize_t received = model_checker_->channel().receive(buff.data(), buff.size(), true); + xbt_assert(received == sizeof(s_mc_message_int_t), "Unexpected size in answer to ACTOR_ENABLED"); + return ((s_mc_message_int_t*)buff.data())->value; +} +void Session::check_deadlock() const +{ + xbt_assert(model_checker_->channel().send(MessageType::DEADLOCK_CHECK) == 0, "Could not check deadlock state"); + s_mc_message_int_t message; + ssize_t s = model_checker_->channel().receive(message); + xbt_assert(s != -1, "Could not receive message"); + xbt_assert(s == sizeof(message) && message.type == MessageType::DEADLOCK_CHECK_REPLY, + "Received unexpected message %s (%i, size=%i) " + "expected MessageType::DEADLOCK_CHECK_REPLY (%i, size=%i)", + to_c_str(message.type), (int)message.type, (int)s, (int)MessageType::DEADLOCK_CHECK_REPLY, + (int)sizeof(message)); + + if (message.value != 0) { + XBT_CINFO(mc_global, "**************************"); + XBT_CINFO(mc_global, "*** DEADLOCK DETECTED ***"); + XBT_CINFO(mc_global, "**************************"); + XBT_CINFO(mc_global, "Counter-example execution trace:"); + for (auto const& frame : model_checker_->get_exploration()->get_textual_trace()) + XBT_CINFO(mc_global, " %s", frame.c_str()); + XBT_CINFO(mc_global, "Path = %s", model_checker_->get_exploration()->get_record_trace().to_string().c_str()); + log_state(); + throw DeadlockError(); + } +} } }