X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/a881c873c9afd5283e230587ae68d1b8b1b82fba..f7c41fccf22633f1ceac63c68f929c7716affdfa:/src/simix/smx_context.cpp diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp index 84da19332f..519bd46491 100644 --- a/src/simix/smx_context.cpp +++ b/src/simix/smx_context.cpp @@ -1,62 +1,33 @@ /* a fast and simple context switching library */ -/* Copyright (c) 2009-2015. The SimGrid Team. - * All rights reserved. */ +/* Copyright (c) 2009-2019. 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 -#include - -#include -#include - -#include "src/internal_config.h" -#include "xbt/log.h" -#include "xbt/swag.h" -#include "xbt/xbt_os_thread.h" -#include "smx_private.h" -#include "simgrid/sg_config.h" #include "src/internal_config.h" -#include "simgrid/modelchecker.h" - - -#ifdef _WIN32 -#include -#include -#else -#include -#endif - -#ifdef __MINGW32__ -#define _aligned_malloc __mingw_aligned_malloc -#define _aligned_free __mingw_aligned_free -#endif //MINGW +#include "src/simix/smx_private.hpp" +#include "src/smpi/include/smpi_config.hpp" +#include "xbt/config.hpp" -#if HAVE_VALGRIND_H -# include -#endif +#include XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mechanism"); -static std::pair context_factories[] = { +static std::pair context_factories[] = { #if HAVE_RAW_CONTEXTS - { "raw", simgrid::simix::raw_factory }, + { "raw", &simgrid::kernel::context::raw_factory }, #endif #if HAVE_UCONTEXT_CONTEXTS - { "ucontext", simgrid::simix::sysv_factory }, + { "ucontext", &simgrid::kernel::context::sysv_factory }, #endif #if HAVE_BOOST_CONTEXTS - { "boost", simgrid::simix::boost_factory }, -#endif -#if HAVE_THREAD_CONTEXTS - { "thread", simgrid::simix::thread_factory }, + { "boost", &simgrid::kernel::context::boost_factory }, #endif + { "thread", &simgrid::kernel::context::thread_factory }, }; -static_assert(sizeof(context_factories) != 0, - "No context factories are enabled for this build"); +static_assert(sizeof(context_factories) != 0, "No context factories are enabled for this build"); // Create the list of possible contexts: static inline @@ -76,58 +47,39 @@ static simgrid::config::Flag context_factory_name( (std::string("Possible values: ")+contexts_list()).c_str(), context_factories[0].first); -int smx_context_stack_size; -int smx_context_stack_size_was_set = 0; -int smx_context_guard_size; -int smx_context_guard_size_was_set = 0; -#if HAVE_THREAD_LOCAL_STORAGE -static XBT_THREAD_LOCAL smx_context_t smx_current_context_parallel; -#else -static xbt_os_thread_key_t smx_current_context_key = 0; -#endif -static smx_context_t smx_current_context_serial; +unsigned smx_context_stack_size; +unsigned smx_context_guard_size; 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; -static inline -void invalid_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."); -} - /** * This function is called by SIMIX_global_init() to initialize the context module. */ -void SIMIX_context_mod_init(void) +void SIMIX_context_mod_init() { -#if HAVE_THREAD_CONTEXTS && !HAVE_THREAD_LOCAL_STORAGE - /* the __thread storage class is not available on this platform: - * use getspecific/setspecific instead to store the current context in each thread */ - xbt_os_thread_key_create(&smx_current_context_key); + 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 (simix_global->context_factory) - return; + +#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::simix::factory_initializer) { // Give Java a chance to hijack the factory mechanism - simix_global->context_factory = simgrid::simix::factory_initializer(); + 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 */ @@ -136,153 +88,89 @@ void SIMIX_context_mod_init(void) simix_global->context_factory = factory.second(); break; } - if (simix_global->context_factory == nullptr) - invalid_context_factory(); -} - -/** - * This function is called by SIMIX_clean() to finalize the context module. - */ -void SIMIX_context_mod_exit(void) -{ - delete simix_global->context_factory; - simix_global->context_factory = nullptr; -} -void *SIMIX_context_stack_new(void) -{ - void *stack; - - /* FIXME: current code for stack overflow protection assumes that stacks are - * growing downward (PTH_STACKGROWTH == -1). Protected pages need to be put - * after the stack when PTH_STACKGROWTH == 1. */ - - if (smx_context_guard_size > 0 && !MC_is_active()) { - -#if !defined(PTH_STACKGROWTH) || (PTH_STACKGROWTH != -1) - static int warned_once = 0; - if (!warned_once) { - XBT_WARN("Stack overflow protection is known to be broken on your system. Either stack grows upwards, or it was not even tested properly."); - warned_once = 1; - } + 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 - - size_t size = smx_context_stack_size + smx_context_guard_size; -#if HAVE_MC - /* Cannot use posix_memalign when HAVE_MC. Align stack by hand, and save the - * pointer returned by xbt_malloc0. */ - char *alloc = (char*)xbt_malloc0(size + xbt_pagesize); - stack = alloc - ((uintptr_t)alloc & (xbt_pagesize - 1)) + xbt_pagesize; - *((void **)stack - 1) = alloc; -#elif !defined(_WIN32) - if (posix_memalign(&stack, xbt_pagesize, size) != 0) - xbt_die("Failed to allocate stack."); +#if HAVE_UCONTEXT_CONTEXTS + XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); #else - stack = _aligned_malloc(size, xbt_pagesize); + XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)"); #endif - -#ifndef _WIN32 - if (mprotect(stack, smx_context_guard_size, PROT_NONE) == -1) { - xbt_die("Failed to protect stack: %s", strerror(errno)); - /* This is fatal. We are going to fail at some point when - we tryi reusing this. */ - } +#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 - stack = (char *)stack + smx_context_guard_size; - } else { - stack = xbt_malloc0(smx_context_stack_size); + XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc"); + xbt_die("Please use a valid factory."); } - -#if HAVE_VALGRIND_H - unsigned int valgrind_stack_id = VALGRIND_STACK_REGISTER(stack, (char *)stack + smx_context_stack_size); - memcpy((char *)stack + smx_context_usable_stack_size, &valgrind_stack_id, sizeof valgrind_stack_id); -#endif - - return stack; } -void SIMIX_context_stack_delete(void *stack) +/** + * This function is called by SIMIX_clean() to finalize the context module. + */ +void SIMIX_context_mod_exit() { - if (!stack) - return; - -#if HAVE_VALGRIND_H - unsigned int valgrind_stack_id; - memcpy(&valgrind_stack_id, (char *)stack + smx_context_usable_stack_size, sizeof valgrind_stack_id); - VALGRIND_STACK_DEREGISTER(valgrind_stack_id); -#endif - -#ifndef _WIN32 - if (smx_context_guard_size > 0 && !MC_is_active()) { - stack = (char *)stack - smx_context_guard_size; - if (mprotect(stack, smx_context_guard_size, PROT_READ | PROT_WRITE) == -1) { - XBT_WARN("Failed to remove page protection: %s", strerror(errno)); - /* try to pursue anyway */ - } -#if HAVE_MC - /* Retrieve the saved pointer. See SIMIX_context_stack_new above. */ - stack = *((void **)stack - 1); -#endif - } -#endif /* not windows */ - - xbt_free(stack); + 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(void) { +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) + * @return the number of threads (1 means no parallelism) */ -int SIMIX_context_get_nthreads(void) { +int SIMIX_context_get_nthreads() { return smx_parallel_contexts; } /** - * \brief Sets the number of parallel threads to use + * @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 + * @param nb_threads the number of threads to use */ void SIMIX_context_set_nthreads(int nb_threads) { - if (nb_threads<=0) { - nb_threads = xbt_os_get_numcores(); - XBT_INFO("Auto-setting contexts/nthreads to %d",nb_threads); - } -#if !HAVE_THREAD_CONTEXTS - xbt_assert(nb_threads == 1, "Parallel runs are impossible when the pthreads are missing."); -#endif + 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 threshold above which user processes are run in parallel. + * @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 + * @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(void) { +int SIMIX_context_get_parallel_threshold() { return smx_parallel_threshold; } /** - * \brief Sets the threshold above which user processes are run in parallel. + * @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 + * @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) { @@ -290,55 +178,19 @@ void SIMIX_context_set_parallel_threshold(int threshold) { } /** - * \brief Returns the synchronization mode used when processes are run in + * @brief Returns the synchronization mode used when processes are run in * parallel. - * \return how threads are synchronized if 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(void) { +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 + * @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 + * @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; } - -/** - * \brief Returns the current context of this thread. - * \return the current context of this thread - */ -smx_context_t SIMIX_context_get_current(void) -{ - if (SIMIX_context_is_parallel()) { -#if HAVE_THREAD_LOCAL_STORAGE - return smx_current_context_parallel; -#else - return xbt_os_thread_get_specific(smx_current_context_key); -#endif - } - else { - return smx_current_context_serial; - } -} - -/** - * \brief Sets the current context of this thread. - * \param context the context to set - */ -void SIMIX_context_set_current(smx_context_t context) -{ - if (SIMIX_context_is_parallel()) { -#if HAVE_THREAD_LOCAL_STORAGE - smx_current_context_parallel = context; -#else - xbt_os_thread_set_specific(smx_current_context_key, context); -#endif - } - else { - smx_current_context_serial = context; - } -}