X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f45abd9a448a9196144cb2aa845cb966b741d562..6b8a729e30679c358cc7f96b061d9406c8a8d9df:/src/simix/smx_context.cpp diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp index 3a6a2245df..e7968b860a 100644 --- a/src/simix/smx_context.cpp +++ b/src/simix/smx_context.cpp @@ -1,126 +1,58 @@ /* a fast and simple context switching library */ -/* Copyright (c) 2009-2018. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2009-2021. 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/simix/smx_private.hpp" +#include "src/internal_config.h" +#include "src/kernel/EngineImpl.hpp" +#include "src/smpi/include/private.hpp" #include "xbt/config.hpp" +#include #include XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mechanism"); -static std::pair context_factories[] = { +constexpr std::initializer_list> + context_factories = { #if HAVE_RAW_CONTEXTS - { "raw", &simgrid::kernel::context::raw_factory }, + {"raw", &simgrid::kernel::context::raw_factory}, #endif #if HAVE_UCONTEXT_CONTEXTS - { "ucontext", &simgrid::kernel::context::sysv_factory }, + {"ucontext", &simgrid::kernel::context::sysv_factory}, #endif #if HAVE_BOOST_CONTEXTS - { "boost", &simgrid::kernel::context::boost_factory }, + {"boost", &simgrid::kernel::context::boost_factory}, #endif - { "thread", &simgrid::kernel::context::thread_factory }, + {"thread", &simgrid::kernel::context::thread_factory}, }; -static_assert(sizeof(context_factories) != 0, "No context factories are enabled for this build"); +static_assert(context_factories.size() > 0, "No context factories are enabled for this build"); // Create the list of possible contexts: static inline std::string contexts_list() { std::string res; - const std::size_t n = sizeof(context_factories) / sizeof(context_factories[0]); - for (std::size_t i = 1; i != n; ++i) { - res += ", "; - res += context_factories[i].first; + std::string sep = ""; + for (auto const& factory : context_factories) { + res += sep + factory.first; + sep = ", "; } return res; } -static simgrid::config::Flag context_factory_name( - "contexts/factory", - (std::string("Possible values: ")+contexts_list()).c_str(), - context_factories[0].first); +static simgrid::config::Flag + context_factory_name("contexts/factory", (std::string("Possible values: ") + contexts_list()).c_str(), + context_factories.begin()->first); unsigned smx_context_stack_size; -int smx_context_stack_size_was_set = 0; unsigned smx_context_guard_size; -int smx_context_guard_size_was_set = 0; static int smx_parallel_contexts = 1; -static int smx_parallel_threshold = 2; static e_xbt_parmap_mode_t smx_parallel_synchronization_mode = XBT_PARMAP_DEFAULT; -/** - * This function is called by SIMIX_global_init() to initialize the context module. - */ -void SIMIX_context_mod_init() -{ - xbt_assert(simix_global->context_factory == nullptr); - - smx_context_stack_size_was_set = not simgrid::config::is_default("contexts/stack-size"); - smx_context_guard_size_was_set = not simgrid::config::is_default("contexts/guard-size"); - -#if HAVE_SMPI && (defined(__APPLE__) || defined(__NetBSD__)) - std::string priv = simgrid::config::get_value("smpi/privatization"); - if (context_factory_name == "thread" && (priv == "dlopen" || priv == "yes" || priv == "default" || priv == "1")) { - XBT_WARN("dlopen+thread broken on Apple and BSD. Switching to raw contexts."); - context_factory_name = "raw"; - } -#endif - -#if HAVE_SMPI && defined(__FreeBSD__) - if (context_factory_name == "thread" && simgrid::config::get_value("smpi/privatization") != "no") { - XBT_WARN("mmap broken on FreeBSD, but dlopen+thread broken too. Switching to dlopen+raw contexts."); - context_factory_name = "raw"; - } -#endif - - /* select the context factory to use to create the contexts */ - if (simgrid::kernel::context::factory_initializer != nullptr) { // Give Java a chance to hijack the factory mechanism - simix_global->context_factory = simgrid::kernel::context::factory_initializer(); - return; - } - /* use the factory specified by --cfg=contexts/factory:value */ - for (auto const& factory : context_factories) - if (context_factory_name == factory.first) { - simix_global->context_factory = factory.second(); - break; - } - - if (simix_global->context_factory == nullptr) { - XBT_ERROR("Invalid context factory specified. Valid factories on this machine:"); -#if HAVE_RAW_CONTEXTS - XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid"); -#else - XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)"); -#endif -#if HAVE_UCONTEXT_CONTEXTS - XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); -#else - XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)"); -#endif -#if HAVE_BOOST_CONTEXTS - XBT_ERROR(" boost: this uses the boost libraries context implementation"); -#else - XBT_ERROR(" (boost was disabled at compilation time on this machine -- check configure logs for details. Did you install the libboost-context-dev package?)"); -#endif - XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc"); - xbt_die("Please use a valid factory."); - } -} - -/** - * This function is called by SIMIX_clean() to finalize the context module. - */ -void SIMIX_context_mod_exit() -{ - delete simix_global->context_factory; - simix_global->context_factory = nullptr; -} - /** @brief Returns whether some parallel threads are used for the user contexts. */ int SIMIX_context_is_parallel() { return smx_parallel_contexts > 1; @@ -152,32 +84,6 @@ void SIMIX_context_set_nthreads(int nb_threads) { smx_parallel_contexts = nb_threads; } -/** - * @brief Returns the threshold above which user processes are run in parallel. - * - * If the number of threads is set to 1, there is no parallelism and this - * threshold has no effect. - * - * @return when the number of user processes ready to run is above - * this threshold, they are run in parallel - */ -int SIMIX_context_get_parallel_threshold() { - return smx_parallel_threshold; -} - -/** - * @brief Sets the threshold above which user processes are run in parallel. - * - * If the number of threads is set to 1, there is no parallelism and this - * threshold has no effect. - * - * @param threshold when the number of user processes ready to run is above - * this threshold, they are run in parallel - */ -void SIMIX_context_set_parallel_threshold(int threshold) { - smx_parallel_threshold = threshold; -} - /** * @brief Returns the synchronization mode used when processes are run in * parallel. @@ -195,3 +101,64 @@ e_xbt_parmap_mode_t SIMIX_context_get_parallel_mode() { void SIMIX_context_set_parallel_mode(e_xbt_parmap_mode_t mode) { smx_parallel_synchronization_mode = mode; } + +namespace simgrid { +namespace kernel { + +void EngineImpl::context_mod_init() const +{ + xbt_assert(not instance_->has_context_factory()); + +#if HAVE_SMPI && (defined(__APPLE__) || defined(__NetBSD__)) + smpi_init_options_internal(false); + std::string priv = config::get_value("smpi/privatization"); + if (context_factory_name == "thread" && (priv == "dlopen" || priv == "yes" || priv == "default" || priv == "1")) { + XBT_WARN("dlopen+thread broken on Apple and BSD. Switching to raw contexts."); + context_factory_name = "raw"; + } +#endif + +#if HAVE_SMPI && defined(__FreeBSD__) + smpi_init_options_internal(false); + if (context_factory_name == "thread" && config::get_value("smpi/privatization") != "no") { + XBT_WARN("mmap broken on FreeBSD, but dlopen+thread broken too. Switching to dlopen+raw contexts."); + context_factory_name = "raw"; + } +#endif + + /* select the context factory to use to create the contexts */ + if (context::factory_initializer != nullptr) { // Give Java a chance to hijack the factory mechanism + instance_->set_context_factory(context::factory_initializer()); + return; + } + /* use the factory specified by --cfg=contexts/factory:value */ + for (auto const& factory : context_factories) + if (context_factory_name == factory.first) { + instance_->set_context_factory(factory.second()); + break; + } + + if (not instance_->has_context_factory()) { + XBT_ERROR("Invalid context factory specified. Valid factories on this machine:"); +#if HAVE_RAW_CONTEXTS + XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid"); +#else + XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)"); +#endif +#if HAVE_UCONTEXT_CONTEXTS + XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); +#else + XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)"); +#endif +#if HAVE_BOOST_CONTEXTS + XBT_ERROR(" boost: this uses the boost libraries context implementation"); +#else + XBT_ERROR(" (boost was disabled at compilation time on this machine -- check configure logs for details. Did you " + "install the libboost-context-dev package?)"); +#endif + XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc"); + xbt_die("Please use a valid factory."); + } +} +} // namespace kernel +} // namespace simgrid