X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/6778416c2ce4535d1542c59429af4fa4b3ede90b..4d5c6aed22b8ae1c8a73cd04d8ab800322d177bf:/src/kernel/context/ContextUnix.cpp diff --git a/src/kernel/context/ContextUnix.cpp b/src/kernel/context/ContextUnix.cpp index 51813a4743..ba2bce922a 100644 --- a/src/kernel/context/ContextUnix.cpp +++ b/src/kernel/context/ContextUnix.cpp @@ -5,12 +5,15 @@ /* \file UContext.cpp Context switching with ucontexts from System V */ -#include "ContextUnix.hpp" #include "context_private.hpp" #include "mc/mc.h" +#include "simgrid/Exception.hpp" #include "src/mc/mc_ignore.hpp" #include "src/simix/ActorImpl.hpp" +#include "src/simix/smx_private.hpp" + +#include "ContextUnix.hpp" XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context); @@ -30,32 +33,23 @@ namespace context { UContextFactory::UContextFactory() : ContextFactory("UContextFactory"), parallel_(SIMIX_context_is_parallel()) { - UContext::setMaestro(nullptr); - if (parallel_) { -#if HAVE_THREAD_CONTEXTS + UContext::set_maestro(nullptr); + if (parallel_) ParallelUContext::initialize(); -#else - xbt_die("No thread support for parallel context execution"); -#endif - } } UContextFactory::~UContextFactory() { -#if HAVE_THREAD_CONTEXTS if (parallel_) ParallelUContext::finalize(); -#endif } Context* UContextFactory::create_context(std::function code, void_pfn_smxprocess_t cleanup, smx_actor_t process) { -#if HAVE_THREAD_CONTEXTS if (parallel_) return new_context(std::move(code), cleanup, process); else -#endif - return new_context(std::move(code), cleanup, process); + return new_context(std::move(code), cleanup, process); } /* This function is called by maestro at the beginning of a scheduling round to get all working threads executing some @@ -64,20 +58,16 @@ Context* UContextFactory::create_context(std::function code, void_pfn_sm */ void UContextFactory::run_all() { -#if HAVE_THREAD_CONTEXTS if (parallel_) ParallelUContext::run_all(); else -#endif - SerialUContext::run_all(); + SwappedContext::run_all(); } // UContext -UContext* UContext::maestro_context_ = nullptr; - UContext::UContext(std::function code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process) - : Context(std::move(code), cleanup_func, process) + : SwappedContext(std::move(code), cleanup_func, process) { /* if the user provided a function for the process then use it, otherwise it is the context for maestro */ if (has_code()) { @@ -93,8 +83,8 @@ UContext::UContext(std::function code, void_pfn_smxprocess_t cleanup_fun #endif UContext::make_ctx(&this->uc_, UContext::smx_ctx_sysv_wrapper, this); } else { - if (process != nullptr && maestro_context_ == nullptr) - maestro_context_ = this; + if (process != nullptr && get_maestro() == nullptr) + set_maestro(this); } #if SIMGRID_HAVE_MC @@ -121,10 +111,13 @@ void UContext::smx_ctx_sysv_wrapper(int i1, int i2) ASAN_FINISH_SWITCH(nullptr, &context->asan_ctx_->asan_stack_, &context->asan_ctx_->asan_stack_size_); try { (*context)(); - context->Context::stop(); } catch (simgrid::kernel::context::Context::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(); } @@ -141,12 +134,13 @@ void UContext::make_ctx(ucontext_t* ucp, void (*func)(int, int), UContext* arg) makecontext(ucp, (void (*)())func, 2, ctx_addr[0], ctx_addr[1]); } -inline void UContext::swap(UContext* from, UContext* to) +void UContext::swap_into(SwappedContext* to_) { + UContext* 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_); - swapcontext(&from->uc_, &to->uc_); + swapcontext(&this->uc_, &to->uc_); ASAN_FINISH_SWITCH(fake_stack, &from->asan_ctx_->asan_stack_, &from->asan_ctx_->asan_stack_size_); } @@ -156,52 +150,11 @@ void UContext::stop() throw StopRequest(); } -// SerialUContext - -unsigned long SerialUContext::process_index_; /* index of the next process to run in the list of runnable processes */ - -void SerialUContext::suspend() -{ - /* determine the next context */ - SerialUContext* 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(UContext::getMaestro()); - } - SIMIX_context_set_current(next_context); - UContext::swap(this, next_context); -} - -void SerialUContext::resume() -{ - SIMIX_context_set_current(this); - UContext::swap(UContext::getMaestro(), this); -} - -void SerialUContext::run_all() -{ - if (simix_global->process_to_run.empty()) - return; - smx_actor_t first_process = simix_global->process_to_run.front(); - process_index_ = 1; - static_cast(first_process->context_)->resume(); -} - // ParallelUContext -#if HAVE_THREAD_CONTEXTS - simgrid::xbt::Parmap* ParallelUContext::parmap_; std::atomic ParallelUContext::threads_working_; /* number of threads that have started their work */ -xbt_os_thread_key_t ParallelUContext::worker_id_key_; /* thread-specific storage for the thread id */ +thread_local uintptr_t ParallelUContext::worker_id_; /* thread-specific storage for the thread id */ std::vector ParallelUContext::workers_context_; /* space to save the worker's context * in each thread */ @@ -210,7 +163,6 @@ void ParallelUContext::initialize() parmap_ = nullptr; workers_context_.clear(); workers_context_.resize(SIMIX_context_get_nthreads(), nullptr); - xbt_os_thread_key_create(&worker_id_key_); } void ParallelUContext::finalize() @@ -218,7 +170,6 @@ void ParallelUContext::finalize() delete parmap_; parmap_ = nullptr; workers_context_.clear(); - xbt_os_thread_key_destroy(worker_id_key_); } void ParallelUContext::run_all() @@ -259,33 +210,30 @@ void ParallelUContext::suspend() } else { // All processes were run, go to the barrier XBT_DEBUG("No more processes to run"); - // Get back the identity of my body that was stored when starting the scheduling round - uintptr_t worker_id = reinterpret_cast(xbt_os_thread_get_specific(worker_id_key_)); + // worker_id_ is the identity of my body, stored in thread_local when starting the scheduling round // Deduce the initial soul of that body - next_context = workers_context_[worker_id]; + next_context = workers_context_[worker_id_]; // When given that soul, the body will wait for the next scheduling round } - SIMIX_context_set_current(next_context); + Context::set_current(next_context); // Get the next soul to run, either simulated or initial minion's one: - UContext::swap(this, next_context); + this->swap_into(next_context); } /** Run one particular simulated process on the current thread. */ void ParallelUContext::resume() { - // What is my containing body? - uintptr_t worker_id = threads_working_.fetch_add(1, std::memory_order_relaxed); - // Store the number of my containing body in os-thread-specific area : - xbt_os_thread_set_specific(worker_id_key_, reinterpret_cast(worker_id)); + // What is my containing body? Store its number in os-thread-specific area : + worker_id_ = threads_working_.fetch_add(1, std::memory_order_relaxed); // Get my current soul: - ParallelUContext* worker_context = static_cast(SIMIX_context_self()); + ParallelUContext* worker_context = static_cast(self()); // Write down that this soul is hosted in that body (for now) - workers_context_[worker_id] = worker_context; + workers_context_[worker_id_] = worker_context; // Write in simix that I switched my soul - SIMIX_context_set_current(this); + Context::set_current(this); // Actually do that using the relevant library call: - UContext::swap(worker_context, this); + worker_context->swap_into(this); // No body runs that soul anymore at this point. Instead the current body took the soul of simulated process The // simulated process wakes back after the call to "SIMIX_context_suspend(self->context);" within // smx_process.c::SIMIX_process_yield() @@ -295,8 +243,6 @@ void ParallelUContext::resume() // initial soul of the current working thread } -#endif - XBT_PRIVATE ContextFactory* sysv_factory() { XBT_VERB("Activating SYSV context factory");