X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/10fa8a8eb7be70db4f1a68a53dd22f20681f7092..6fbcdfade89b3812c24152c86f8aa3be510df7f2:/src/kernel/context/Context.cpp diff --git a/src/kernel/context/Context.cpp b/src/kernel/context/Context.cpp index bbbf5eb061..1b9e45922c 100644 --- a/src/kernel/context/Context.cpp +++ b/src/kernel/context/Context.cpp @@ -1,44 +1,107 @@ -/* Copyright (c) 2007-2019. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2007-2023. 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 "mc/mc.h" +#include "simgrid/Exception.hpp" #include "simgrid/s4u/Host.hpp" #include "src/kernel/activity/CommImpl.hpp" #include "src/kernel/context/Context.hpp" -#include "src/simix/smx_private.hpp" +#include "src/sthread/sthread.h" #include "src/surf/surf_interface.hpp" -XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context); +#include +XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ker_context, kernel, "Context switching mechanism"); -namespace simgrid { -namespace kernel { -namespace context { +namespace simgrid::kernel::context { -ContextFactoryInitializer factory_initializer = nullptr; +static e_xbt_parmap_mode_t parallel_synchronization_mode = XBT_PARMAP_DEFAULT; +static int parallel_contexts = 1; +unsigned stack_size; +unsigned guard_size; + +/** @brief Returns whether some parallel threads are used for the user contexts. */ +bool is_parallel() +{ + return parallel_contexts > 1; +} + +/** + * @brief Returns the number of parallel threads used for the user contexts. + * @return the number of threads (1 means no parallelism) + */ +int get_nthreads() +{ + return parallel_contexts; +} + +/** + * @brief Sets the number of parallel threads to use for the user contexts. + * + * This function should be called before initializing SIMIX. + * A value of 1 means no parallelism (1 thread only). + * If the value is greater than 1, the thread support must be enabled. + * + * @param nb_threads the number of threads to use + */ +void set_nthreads(int nb_threads) +{ + if (nb_threads <= 0) { + nb_threads = std::thread::hardware_concurrency(); + XBT_INFO("Auto-setting contexts/nthreads to %d", nb_threads); + } + parallel_contexts = nb_threads; +} + +/** + * @brief Sets the synchronization mode to use when actors are run in parallel. + * @param mode how to synchronize threads if actors are run in parallel + */ +void set_parallel_mode(e_xbt_parmap_mode_t mode) +{ + parallel_synchronization_mode = mode; +} + +/** + * @brief Returns the synchronization mode used when actors are run in parallel. + * @return how threads are synchronized if actors are run in parallel + */ +e_xbt_parmap_mode_t get_parallel_mode() +{ + return parallel_synchronization_mode; +} ContextFactory::~ContextFactory() = default; -static thread_local smx_context_t smx_current_context = nullptr; +thread_local Context* Context::current_context_ = nullptr; + +/* Install or disable alternate signal stack, for SIGSEGV handler. */ +int Context::install_sigsegv_stack(stack_t* old_stack, bool enable) +{ + static std::vector sigsegv_stack(SIGSTKSZ); + stack_t stack; + stack.ss_sp = sigsegv_stack.data(); + stack.ss_size = sigsegv_stack.size(); + stack.ss_flags = enable ? 0 : SS_DISABLE; + return sigaltstack(&stack, old_stack); +} + Context* Context::self() { - return smx_current_context; + return current_context_; } void Context::set_current(Context* self) { - smx_current_context = self; + current_context_ = self; } void Context::declare_context(std::size_t size) { -#if SIMGRID_HAVE_MC /* Store the address of the stack in heap to compare it apart of heap comparison */ - if(MC_is_active()) - MC_ignore_heap(this, size); -#endif + MC_ignore_heap(this, size); } Context* ContextFactory::attach(actor::ActorImpl*) @@ -53,11 +116,11 @@ Context* ContextFactory::create_maestro(std::function&&, actor::ActorImp "Try using --cfg=contexts/factory:thread instead.\n"); } -Context::Context(std::function&& code, actor::ActorImpl* actor) : code_(std::move(code)), actor_(actor) +Context::Context(std::function&& code, actor::ActorImpl* actor, bool maestro) + : code_(std::move(code)), actor_(actor), is_maestro_(maestro) { - /* If no function was provided, this is the context for maestro - * and we should set it as the current context */ - if (not has_code()) + /* If we are creating maestro, we should set it as the current context */ + if (maestro) set_current(this); } @@ -69,49 +132,10 @@ Context::~Context() void Context::stop() { - actor_->finished_ = true; - - if (actor_->has_to_auto_restart() && not actor_->get_host()->is_on()) { - XBT_DEBUG("Insert host %s to watched_hosts because it's off and %s needs to restart", - actor_->get_host()->get_cname(), actor_->get_cname()); - watched_hosts.insert(actor_->get_host()->get_name()); - } - - // Execute the termination callbacks - smx_process_exit_status_t exit_status = (actor_->context_->iwannadie) ? SMX_EXIT_FAILURE : SMX_EXIT_SUCCESS; - while (not actor_->on_exit.empty()) { - s_smx_process_exit_fun_t exit_fun = actor_->on_exit.back(); - actor_->on_exit.pop_back(); - (exit_fun.fun)(exit_status, exit_fun.arg); - } - - /* cancel non-blocking activities */ - for (auto activity : actor_->comms) - boost::static_pointer_cast(activity)->cancel(); - actor_->comms.clear(); - - XBT_DEBUG("%s@%s(%ld) should not run anymore", actor_->get_cname(), actor_->iface()->get_host()->get_cname(), - actor_->get_pid()); - - this->actor_->cleanup(); - - this->iwannadie = false; // don't let the simcall's yield() do a Context::stop(), because that's me - simgrid::simix::simcall([this] { - simgrid::s4u::Actor::on_destruction(actor_->iface()); - - actor_->cleanup(); - }); - this->iwannadie = true; + this->actor_->cleanup_from_self(); + sthread_disable(); + throw ForcefulKillException(); // clean RAII variables with the dedicated exception } - AttachContext::~AttachContext() = default; -} // namespace context -} // namespace kernel -} // namespace simgrid - -/** @brief Executes all the processes to run (in parallel if possible). */ -void SIMIX_context_runall() -{ - simix_global->context_factory->run_all(); -} +} // namespace simgrid::kernel::context