X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/9fb274493911c49b0e1e9ef4b19c81adea5ff7c8..4d5c6aed22b8ae1c8a73cd04d8ab800322d177bf:/src/kernel/context/ContextRaw.cpp diff --git a/src/kernel/context/ContextRaw.cpp b/src/kernel/context/ContextRaw.cpp index 1cd6340932..93d7d86824 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 "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 *); @@ -257,66 +184,59 @@ namespace simgrid { namespace kernel { namespace context { -RawContextFactory::RawContextFactory() - : ContextFactory("RawContextFactory") +// RawContextFactory + +RawContextFactory::RawContextFactory() : ContextFactory("RawContextFactory"), parallel_(SIMIX_context_is_parallel()) { - 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 = new RawContext*[nthreads]; - raw_maestro_context = nullptr; -#endif + RawContext::set_maestro(nullptr); + if (parallel_) { // TODO: choose dynamically when SIMIX_context_get_parallel_threshold() > 1 + ParallelRawContext::initialize(); } } RawContextFactory::~RawContextFactory() { -#if HAVE_THREAD_CONTEXTS - delete raw_parmap; - delete[] raw_workers_context; -#endif + if (parallel_) + ParallelRawContext::finalize(); } -RawContext* RawContextFactory::create_context(std::function code, - void_pfn_smxprocess_t cleanup, smx_actor_t process) +Context* RawContextFactory::create_context(std::function code, void_pfn_smxprocess_t cleanup_func, + smx_actor_t process) { - return this->new_context(std::move(code), cleanup, process); + if (parallel_) + return this->new_context(std::move(code), cleanup_func, process); + return this->new_context(std::move(code), cleanup_func, process); } -void RawContext::wrapper(void* arg) +void RawContextFactory::run_all() { - RawContext* context = static_cast(arg); - try { - (*context)(); - context->Context::stop(); - } catch (StopRequest const&) { - XBT_DEBUG("Caught a StopRequest"); - } - context->suspend(); + if (parallel_) + ParallelRawContext::run_all(); + else + SerialRawContext::run_all(); } -RawContext::RawContext(std::function code, - void_pfn_smxprocess_t cleanup, smx_actor_t process) - : Context(std::move(code), cleanup, process) +// RawContext + +RawContext* RawContext::maestro_context_ = nullptr; + +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); +#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 && raw_maestro_context == nullptr) - raw_maestro_context = this; + if (process != nullptr && maestro_context_ == nullptr) + maestro_context_ = this; if (MC_is_active()) - MC_ignore_heap( - &raw_maestro_context->stack_top_, - sizeof(raw_maestro_context->stack_top_)); + MC_ignore_heap(&maestro_context_->stack_top_, sizeof(maestro_context_->stack_top_)); } } @@ -325,142 +245,146 @@ RawContext::~RawContext() SIMIX_context_stack_delete(this->stack_); } +void RawContext::wrapper(void* arg) +{ + RawContext* context = static_cast(arg); + 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(); + + ASAN_ONLY(context->asan_stop_ = true); + context->suspend(); +} + +inline void RawContext::swap(RawContext* from, RawContext* 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(&from->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(); throw StopRequest(); } -void RawContextFactory::run_all() +// SerialRawContext + +unsigned long SerialRawContext::process_index_; /* index of the next process to run in the list of runnable processes */ + +void SerialRawContext::suspend() { - if (raw_context_parallel) - run_all_parallel(); - else - run_all_serial(); + /* determine the next context */ + SerialRawContext* next_context; + unsigned long int i = process_index_; + 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(RawContext::get_maestro()); + } + Context::set_current(next_context); + RawContext::swap(this, next_context); +} + +void SerialRawContext::resume() +{ + RawContext* old = static_cast(self()); + Context::set_current(this); + RawContext::swap(old, this); } -void RawContextFactory::run_all_serial() +void SerialRawContext::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(); + process_index_ = 1; + static_cast(first_process->context_)->resume(); } -void RawContextFactory::run_all_parallel() +// ParallelRawContext + +simgrid::xbt::Parmap* ParallelRawContext::parmap_; +std::atomic ParallelRawContext::threads_working_; /* number of threads that have started their work */ +uintptr_t thread_local ParallelRawContext::worker_id_; /* thread-specific storage for the thread id */ +std::vector ParallelRawContext::workers_context_; /* space to save the worker context + in each thread */ + +void ParallelRawContext::initialize() { -#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( - [](smx_actor_t process) { - RawContext* context = static_cast(process->context); - context->resume_parallel(); - }, - simix_global->process_to_run); -#else - xbt_die("You asked for a parallel execution, but you don't have any threads."); -#endif + parmap_ = nullptr; + workers_context_.clear(); + workers_context_.resize(SIMIX_context_get_nthreads(), nullptr); } -void RawContext::suspend() +void ParallelRawContext::finalize() { - if (raw_context_parallel) - RawContext::suspend_parallel(); - else - RawContext::suspend_serial(); + delete parmap_; + parmap_ = nullptr; + workers_context_.clear(); } -void RawContext::suspend_serial() +void ParallelRawContext::run_all() { - /* 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_); + 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) { + ParallelRawContext* context = static_cast(process->context_); + context->resume(); + }, + simix_global->process_to_run); } -void RawContext::suspend_parallel() +void ParallelRawContext::suspend() { -#if HAVE_THREAD_CONTEXTS /* determine the next context */ - boost::optional next_work = raw_parmap->next(); - RawContext* next_context; + boost::optional next_work = parmap_->next(); + ParallelRawContext* 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 = 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); + RawContext::swap(this, 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); + ParallelRawContext* worker_context = static_cast(self()); + workers_context_[worker_id_] = worker_context; + XBT_DEBUG("Saving worker stack %zu", worker_id_); + Context::set_current(this); + RawContext::swap(worker_context, 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(); } - }}}