X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d98cdc629ec5f6d20e852a7ede11ac44fa843e9d..5afd75483d80ccf2c678e50f82613b3556c7ca97:/src/simix/smx_context.cpp diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp index 4f65ca70cb..2d40401182 100644 --- a/src/simix/smx_context.cpp +++ b/src/simix/smx_context.cpp @@ -1,75 +1,56 @@ /* 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 "simgrid/modelchecker.h" #include "src/internal_config.h" #include "src/simix/smx_private.hpp" +#include "src/smpi/include/private.hpp" #include "xbt/config.hpp" +#include #include -#ifdef _WIN32 -#include -#include -#else -#include -#endif - -#ifdef __MINGW32__ -#define _aligned_malloc __mingw_aligned_malloc -#define _aligned_free __mingw_aligned_free -#endif /*MINGW*/ - -#if HAVE_VALGRIND_H -# include -#endif - 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 thread_local smx_context_t smx_current_context; 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; /** @@ -77,12 +58,10 @@ static e_xbt_parmap_mode_t smx_parallel_synchronization_mode = XBT_PARMAP_DEFAUL */ 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"); + xbt_assert(not simix_global->has_context_factory()); #if HAVE_SMPI && (defined(__APPLE__) || defined(__NetBSD__)) + smpi_init_options_internal(false); 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."); @@ -91,6 +70,7 @@ void SIMIX_context_mod_init() #endif #if HAVE_SMPI && defined(__FreeBSD__) + smpi_init_options_internal(false); 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"; @@ -99,17 +79,17 @@ void SIMIX_context_mod_init() /* 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(); + simix_global->set_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(); + simix_global->set_context_factory(factory.second()); break; } - if (simix_global->context_factory == nullptr) { + if (not simix_global->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"); @@ -131,95 +111,6 @@ void SIMIX_context_mod_init() } } -/** - * 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; -} - -void *SIMIX_context_stack_new() -{ - void *stack; - - if (smx_context_guard_size > 0 && not MC_is_active()) { - -#if !defined(PTH_STACKGROWTH) || (PTH_STACKGROWTH != -1) - xbt_die("Stack overflow protection is known to be broken on your system: you stacks grow upwards (or detection is " - "broken). " - "Please disable stack guards with --cfg=contexts:guard-size:0"); - /* 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. */ -#endif - - size_t size = smx_context_stack_size + smx_context_guard_size; -#if SIMGRID_HAVE_MC - /* Cannot use posix_memalign when SIMGRID_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."); -#else - stack = _aligned_malloc(size, xbt_pagesize); -#endif - -#ifndef _WIN32 - if (mprotect(stack, smx_context_guard_size, PROT_NONE) == -1) { - xbt_die( - "Failed to protect stack: %s.\n" - "If you are running a lot of actors, you may be exceeding the amount of mappings allowed per process.\n" - "On Linux systems, change this value with sudo sysctl -w vm.max_map_count=newvalue (default value: 65536)\n" - "Please see http://simgrid.gforge.inria.fr/simgrid/latest/doc/html/options.html#options_virt for more info.", - strerror(errno)); - /* This is fatal. We are going to fail at some point when we try reusing this. */ - } -#endif - stack = (char *)stack + smx_context_guard_size; - } else { - stack = xbt_malloc0(smx_context_stack_size); - } - -#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) -{ - if (not 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 && not 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 SIMGRID_HAVE_MC - /* Retrieve the saved pointer. See SIMIX_context_stack_new above. */ - stack = *((void **)stack - 1); -#endif - } -#endif /* not windows */ - - xbt_free(stack); -} - /** @brief Returns whether some parallel threads are used for the user contexts. */ int SIMIX_context_is_parallel() { return smx_parallel_contexts > 1; @@ -251,32 +142,6 @@ 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. @@ -294,21 +159,3 @@ 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; } - -/** - * @brief Returns the current context of this thread. - * @return the current context of this thread - */ -smx_context_t SIMIX_context_get_current() -{ - return smx_current_context; -} - -/** - * @brief Sets the current context of this thread. - * @param context the context to set - */ -void SIMIX_context_set_current(smx_context_t context) -{ - smx_current_context = context; -}