X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/e94c2a7fc81a82998524aa55db075be69990d4ea..73a0ae62cf92da83e861cfaf9ba0313cacbc4825:/src/kernel/context/Context.cpp diff --git a/src/kernel/context/Context.cpp b/src/kernel/context/Context.cpp index 71046510aa..6827ff96c4 100644 --- a/src/kernel/context/Context.cpp +++ b/src/kernel/context/Context.cpp @@ -1,106 +1,148 @@ -/* Copyright (c) 2007-2018. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2007-2022. 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 "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::kernel::context { + +std::function ContextFactory::initializer; + +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 creates a new context for a user level process - * @param code a main function - * @param cleanup_func the function to call when the context stops - * @param simix_process + * @brief Returns the number of parallel threads used for the user contexts. + * @return the number of threads (1 means no parallelism) */ -smx_context_t SIMIX_context_new( - std::function code, - void_pfn_smxprocess_t cleanup_func, - smx_actor_t simix_process) +int get_nthreads() { - xbt_assert(simix_global, "simix is not initialized, please call MSG_init first"); - return simix_global->context_factory->create_context( - std::move(code), cleanup_func, simix_process); + return parallel_contexts; } -namespace simgrid { -namespace kernel { -namespace context { +/** + * @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; +} -ContextFactoryInitializer factory_initializer = nullptr; +/** + * @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; -Context* ContextFactory::self() +thread_local Context* Context::current_context_ = nullptr; + +#ifndef WIN32 +/* 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); +} +#endif + +Context* Context::self() +{ + return current_context_; +} +void Context::set_current(Context* self) { - return SIMIX_context_get_current(); + current_context_ = self; } -void ContextFactory::declare_context(void* context, std::size_t size) +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(context, size); + MC_ignore_heap(this, size); #endif } -Context* ContextFactory::attach(void_pfn_smxprocess_t cleanup_func, smx_actor_t process) +Context* ContextFactory::attach(actor::ActorImpl*) { xbt_die("Cannot attach with this ContextFactory.\n" "Try using --cfg=contexts/factory:thread instead.\n"); } -Context* ContextFactory::create_maestro(std::function code, smx_actor_t process) +Context* ContextFactory::create_maestro(std::function&&, actor::ActorImpl*) { xbt_die("Cannot create_maestro with this ContextFactory.\n" "Try using --cfg=contexts/factory:thread instead.\n"); } -Context::Context(std::function code, void_pfn_smxprocess_t cleanup_func, smx_actor_t 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 the user provided a function for the process then use it. - Otherwise, it is the context for maestro and we should set it as the - current context */ - if (has_code()) - this->cleanup_func_ = cleanup_func; - else - SIMIX_context_set_current(this); + /* If we are creating maestro, we should set it as the current context */ + if (maestro) + set_current(this); } -Context::~Context() = default; - -void Context::stop() +Context::~Context() { - if (this->cleanup_func_) - this->cleanup_func_(this->actor_); - this->actor_->suspended_ = 0; - - this->iwannadie = false; - simgrid::simix::simcall([this] { SIMIX_process_cleanup(this->actor_); }); - this->iwannadie = true; + if (self() == this) + set_current(nullptr); } -AttachContext::~AttachContext() = default; - -}}} - -/** @brief Executes all the processes to run (in parallel if possible). */ -void SIMIX_context_runall() -{ - simix_global->context_factory->run_all(); -} - -/** @brief returns the current running context */ -smx_context_t SIMIX_context_self() +void Context::stop() { - if (simix_global && simix_global->context_factory) - return simix_global->context_factory->self(); - else - return nullptr; + this->actor_->cleanup_from_self(); + sthread_disable(); + throw ForcefulKillException(); // clean RAII variables with the dedicated exception } +AttachContext::~AttachContext() = default; +} // namespace simgrid::kernel::context