X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f5792a3bf76ce15a573ae5e9c63097595ae5f2bd..3580c1f2e5172b721449d0e79c72241bd012152a:/src/kernel/context/ContextRaw.cpp diff --git a/src/kernel/context/ContextRaw.cpp b/src/kernel/context/ContextRaw.cpp index 53726aa300..38f01918b0 100644 --- a/src/kernel/context/ContextRaw.cpp +++ b/src/kernel/context/ContextRaw.cpp @@ -1,90 +1,17 @@ -/* Copyright (c) 2009-2017. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2009-2018. 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/internal_config.h" - -#include "xbt/parmap.hpp" - -#include "src/simix/smx_private.h" +#include "ContextRaw.hpp" +#include "context_private.hpp" #include "mc/mc.h" +#include "simgrid/Exception.hpp" +#include "src/simix/smx_private.hpp" XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context); -// ***** Class definitions - -namespace simgrid { -namespace kernel { -namespace context { - -class RawContext; -class RawContextFactory; - -/** @brief Fast context switching inspired from SystemV ucontexts. - * - * The main difference to the System V context is that Raw Contexts are much faster because they don't - * preserve the signal mask when switching. This saves a system call (at least on Linux) on each context switch. - */ -class RawContext : public Context { -protected: - void* stack_ = nullptr; - /** pointer to top the stack stack */ - void* stack_top_ = nullptr; -public: - friend class RawContextFactory; - RawContext(std::function code, - void_pfn_smxprocess_t cleanup_func, - smx_actor_t process); - ~RawContext() override; - - static void wrapper(void* arg); - void stop() override; - void suspend() override; - void resume(); -private: - void suspend_serial(); - void suspend_parallel(); - void resume_serial(); - void resume_parallel(); -}; - -class RawContextFactory : public ContextFactory { -public: - RawContextFactory(); - ~RawContextFactory() override; - RawContext* create_context(std::function code, - void_pfn_smxprocess_t cleanup, smx_actor_t process) override; - void run_all() override; -private: - void run_all_adaptative(); - void run_all_serial(); - void run_all_parallel(); -}; - -ContextFactory* raw_factory() -{ - XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us."); - return new RawContextFactory(); -} - -}}} // namespace - -// ***** Loads of static stuff - -#if HAVE_THREAD_CONTEXTS -static simgrid::xbt::Parmap* raw_parmap; -static simgrid::kernel::context::RawContext** raw_workers_context; /* space to save the worker context in each thread */ -static uintptr_t raw_threads_working; /* number of threads that have started their work */ -static xbt_os_thread_key_t raw_worker_id_key; /* thread-specific storage for the thread id */ -#endif -static unsigned long raw_process_index = 0; /* index of the next process to run in the - * list of runnable processes */ -static simgrid::kernel::context::RawContext* raw_maestro_context; - -static bool raw_context_parallel = false; - -// ***** Raw context routines +// Raw context routines typedef void (*rawctx_entry_point_t)(void *); @@ -257,205 +184,127 @@ namespace simgrid { namespace kernel { namespace context { -RawContextFactory::RawContextFactory() - : ContextFactory("RawContextFactory") +// RawContextFactory + +RawContextFactory::RawContextFactory() : SwappedContextFactory("RawContextFactory") {} + +RawContextFactory::~RawContextFactory() = default; + +Context* RawContextFactory::create_context(std::function code, void_pfn_smxprocess_t cleanup_func, + smx_actor_t process) { - raw_context_parallel = SIMIX_context_is_parallel(); - if (raw_context_parallel) { -#if HAVE_THREAD_CONTEXTS - int nthreads = SIMIX_context_get_nthreads(); - xbt_os_thread_key_create(&raw_worker_id_key); - // TODO, lazily init - raw_parmap = nullptr; - raw_workers_context = xbt_new(RawContext*, nthreads); - raw_maestro_context = nullptr; -#endif - // TODO, if(SIMIX_context_get_parallel_threshold() > 1) => choose dynamically - } + if (parallel_) + return this->new_context(std::move(code), cleanup_func, process, this); + return this->new_context(std::move(code), cleanup_func, process, this); } -RawContextFactory::~RawContextFactory() +// RawContext + +RawContext::RawContext(std::function code, void_pfn_smxprocess_t cleanup, smx_actor_t process, + SwappedContextFactory* factory) + : SwappedContext(std::move(code), cleanup, process, factory) { -#if HAVE_THREAD_CONTEXTS - delete raw_parmap; - xbt_free(raw_workers_context); + if (has_code()) { +#if PTH_STACKGROWTH == -1 + ASAN_ONLY(this->asan_stack_ = static_cast(this->stack_) + smx_context_usable_stack_size); +#else + ASAN_ONLY(this->asan_stack_ = this->stack_); #endif + this->stack_top_ = raw_makecontext(this->stack_, smx_context_usable_stack_size, RawContext::wrapper, this); + } else { + if (process != nullptr && get_maestro() == nullptr) + set_maestro(this); + if (MC_is_active()) { + XBT_ATTRIB_UNUSED RawContext* maestro = static_cast(get_maestro()); + MC_ignore_heap(&maestro->stack_top_, sizeof(maestro->stack_top_)); + } + } } -RawContext* RawContextFactory::create_context(std::function code, - void_pfn_smxprocess_t cleanup, smx_actor_t process) -{ - return this->new_context(std::move(code), cleanup, process); -} +RawContext::~RawContext() = default; void RawContext::wrapper(void* arg) { RawContext* context = static_cast(arg); - (*context)(); - context->stop(); -} + ASAN_FINISH_SWITCH(nullptr, &context->asan_ctx_->asan_stack_, &context->asan_ctx_->asan_stack_size_); + try { + (*context)(); + } catch (StopRequest const&) { + XBT_DEBUG("Caught a StopRequest"); + } catch (simgrid::Exception const& e) { + XBT_INFO("Actor killed by an uncatched exception %s", simgrid::xbt::demangle(typeid(e).name()).get()); + throw; + } + context->Context::stop(); -RawContext::RawContext(std::function code, - void_pfn_smxprocess_t cleanup, smx_actor_t process) - : Context(std::move(code), cleanup, process) -{ - if (has_code()) { - this->stack_ = SIMIX_context_stack_new(); - this->stack_top_ = raw_makecontext(this->stack_, - smx_context_usable_stack_size, - RawContext::wrapper, - this); - } else { - if(process != nullptr && raw_maestro_context == nullptr) - raw_maestro_context = this; - if (MC_is_active()) - MC_ignore_heap( - &raw_maestro_context->stack_top_, - sizeof(raw_maestro_context->stack_top_)); - } + ASAN_ONLY(context->asan_stop_ = true); + context->suspend(); } -RawContext::~RawContext() +void RawContext::swap_into(SwappedContext* to_) { - SIMIX_context_stack_delete(this->stack_); + RawContext* to = static_cast(to_); + ASAN_ONLY(void* fake_stack = nullptr); + ASAN_ONLY(to->asan_ctx_ = from); + ASAN_START_SWITCH(from->asan_stop_ ? nullptr : &fake_stack, to->asan_stack_, to->asan_stack_size_); + raw_swapcontext(&this->stack_top_, to->stack_top_); + ASAN_FINISH_SWITCH(fake_stack, &from->asan_ctx_->asan_stack_, &from->asan_ctx_->asan_stack_size_); } void RawContext::stop() { Context::stop(); - this->suspend(); + throw StopRequest(); } -void RawContextFactory::run_all() -{ - if (raw_context_parallel) - run_all_parallel(); - else - run_all_serial(); -} +// ParallelRawContext -void RawContextFactory::run_all_serial() +void ParallelRawContext::run_all() { - if (simix_global->process_to_run.empty()) - return; - - smx_actor_t first_process = simix_global->process_to_run.front(); - raw_process_index = 1; - static_cast(first_process->context)->resume_serial(); -} - -void RawContextFactory::run_all_parallel() -{ -#if HAVE_THREAD_CONTEXTS - raw_threads_working = 0; - if (raw_parmap == nullptr) - raw_parmap = new simgrid::xbt::Parmap(SIMIX_context_get_nthreads(), SIMIX_context_get_parallel_mode()); - raw_parmap->apply( + threads_working_ = 0; + if (parmap_ == nullptr) + parmap_ = new simgrid::xbt::Parmap(SIMIX_context_get_nthreads(), SIMIX_context_get_parallel_mode()); + parmap_->apply( [](smx_actor_t process) { - RawContext* context = static_cast(process->context); - context->resume_parallel(); + ParallelRawContext* context = static_cast(process->context_); + context->resume(); }, simix_global->process_to_run); -#else - xbt_die("You asked for a parallel execution, but you don't have any threads."); -#endif } -void RawContext::suspend() -{ - if (raw_context_parallel) - RawContext::suspend_parallel(); - else - RawContext::suspend_serial(); -} - -void RawContext::suspend_serial() +void ParallelRawContext::suspend() { /* determine the next context */ - RawContext* next_context = nullptr; - unsigned long int i = raw_process_index; - raw_process_index++; - if (i < simix_global->process_to_run.size()) { - /* execute the next process */ - XBT_DEBUG("Run next process"); - next_context = static_cast(simix_global->process_to_run[i]->context); - } else { - /* all processes were run, return to maestro */ - XBT_DEBUG("No more process to run"); - next_context = static_cast(raw_maestro_context); - } - SIMIX_context_set_current(next_context); - raw_swapcontext(&this->stack_top_, next_context->stack_top_); -} - -void RawContext::suspend_parallel() -{ -#if HAVE_THREAD_CONTEXTS - /* determine the next context */ - boost::optional next_work = raw_parmap->next(); - RawContext* next_context; + boost::optional next_work = parmap_->next(); + SwappedContext* next_context; if (next_work) { /* there is a next process to resume */ XBT_DEBUG("Run next process"); - next_context = static_cast(next_work.get()->context); + next_context = static_cast(next_work.get()->context_); } else { /* all processes were run, go to the barrier */ XBT_DEBUG("No more processes to run"); - uintptr_t worker_id = (uintptr_t) - xbt_os_thread_get_specific(raw_worker_id_key); - next_context = static_cast(raw_workers_context[worker_id]); - XBT_DEBUG("Restoring worker stack %zu (working threads = %zu)", - worker_id, raw_threads_working); + next_context = workers_context_[worker_id_]; + XBT_DEBUG("Restoring worker stack %zu (working threads = %zu)", worker_id_, threads_working_.load()); } - SIMIX_context_set_current(next_context); - raw_swapcontext(&this->stack_top_, next_context->stack_top_); -#endif + Context::set_current(next_context); + this->swap_into(next_context); } -void RawContext::resume() +void ParallelRawContext::resume() { - if (raw_context_parallel) - resume_parallel(); - else - resume_serial(); + worker_id_ = threads_working_.fetch_add(1, std::memory_order_relaxed); + SwappedContext* worker_context = static_cast(self()); + workers_context_[worker_id_] = worker_context; + XBT_DEBUG("Saving worker stack %zu", worker_id_); + Context::set_current(this); + worker_context->swap_into(this); } -void RawContext::resume_serial() -{ - SIMIX_context_set_current(this); - raw_swapcontext(&raw_maestro_context->stack_top_, this->stack_top_); -} - -void RawContext::resume_parallel() -{ -#if HAVE_THREAD_CONTEXTS - uintptr_t worker_id = __sync_fetch_and_add(&raw_threads_working, 1); - xbt_os_thread_set_specific(raw_worker_id_key, (void*) worker_id); - RawContext* worker_context = static_cast(SIMIX_context_self()); - raw_workers_context[worker_id] = worker_context; - XBT_DEBUG("Saving worker stack %zu", worker_id); - SIMIX_context_set_current(this); - raw_swapcontext(&worker_context->stack_top_, this->stack_top_); -#else - xbt_die("Parallel execution disabled"); -#endif -} - -/** @brief Resumes all processes ready to run. */ -void RawContextFactory::run_all_adaptative() +ContextFactory* raw_factory() { - unsigned long nb_processes = simix_global->process_to_run.size(); - if (SIMIX_context_is_parallel() && - static_cast(SIMIX_context_get_parallel_threshold()) < nb_processes) { - raw_context_parallel = true; - XBT_DEBUG("Runall // %lu", nb_processes); - this->run_all_parallel(); - } else { - XBT_DEBUG("Runall serial %lu", nb_processes); - raw_context_parallel = false; - this->run_all_serial(); - } + XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us."); + return new RawContextFactory(); } - }}}