X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/39c935d6d5ee86d153f6f7e6a10d723ae7c57f6f..HEAD:/src/simix/smx_context.cpp diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp deleted file mode 100644 index 58516d8ba7..0000000000 --- a/src/simix/smx_context.cpp +++ /dev/null @@ -1,170 +0,0 @@ -/* a fast and simple context switching library */ - -/* 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/internal_config.h" -#include "src/simix/smx_private.hpp" -#include "smpi/smpi.h" -#include "xbt/config.hpp" - -#include -#include - -XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mechanism"); - -constexpr std::initializer_list> - context_factories = { -#if HAVE_RAW_CONTEXTS - {"raw", &simgrid::kernel::context::raw_factory}, -#endif -#if HAVE_UCONTEXT_CONTEXTS - {"ucontext", &simgrid::kernel::context::sysv_factory}, -#endif -#if HAVE_BOOST_CONTEXTS - {"boost", &simgrid::kernel::context::boost_factory}, -#endif - {"thread", &simgrid::kernel::context::thread_factory}, -}; - -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; - 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.begin()->first); - -unsigned smx_context_stack_size; -unsigned smx_context_guard_size; -static int smx_parallel_contexts = 1; -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); - -#if HAVE_SMPI && (defined(__APPLE__) || defined(__NetBSD__)) - smpi_init_options(); - 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__) - smpi_init_options(); - 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; -} - -/** - * @brief Returns the number of parallel threads used for the user contexts. - * @return the number of threads (1 means no parallelism) - */ -int SIMIX_context_get_nthreads() { - return smx_parallel_contexts; -} - -/** - * @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 SIMIX_context_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); - } - smx_parallel_contexts = nb_threads; -} - -/** - * @brief Returns the synchronization mode used when processes are run in - * parallel. - * @return how threads are synchronized if processes are run in parallel - */ -e_xbt_parmap_mode_t SIMIX_context_get_parallel_mode() { - return smx_parallel_synchronization_mode; -} - -/** - * @brief Sets the synchronization mode to use when processes are run in - * parallel. - * @param mode how to synchronize threads if processes are run in parallel - */ -void SIMIX_context_set_parallel_mode(e_xbt_parmap_mode_t mode) { - smx_parallel_synchronization_mode = mode; -}