X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/3cf8dfbfab4595b3e7ae85d3cd89ce9dbcdd7a24..ee781feec002b4257cbb3cf05bb226c7ccba8c78:/src/simix/smx_context.cpp diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp index 9e2dab9ffb..83424f0abb 100644 --- a/src/simix/smx_context.cpp +++ b/src/simix/smx_context.cpp @@ -6,7 +6,13 @@ /* 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/portable.h" +#include +#include + +#include +#include + +#include "src/internal_config.h" #include "xbt/log.h" #include "xbt/swag.h" #include "xbt/xbt_os_thread.h" @@ -29,18 +35,53 @@ #define _aligned_free __mingw_aligned_free #endif //MINGW -#ifdef HAVE_VALGRIND_VALGRIND_H +#if HAVE_VALGRIND_H # include #endif XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mechanism"); -char* smx_context_factory_name = NULL; /* factory name specified by --cfg=contexts/factory:value */ +static std::pair context_factories[] = { +#if HAVE_RAW_CONTEXTS + { "raw", simgrid::simix::raw_factory }, +#endif +#if HAVE_UCONTEXT_CONTEXTS + { "ucontext", simgrid::simix::sysv_factory }, +#endif +#if HAVE_BOOST_CONTEXTS + { "boost", simgrid::simix::boost_factory }, +#endif +#if HAVE_THREAD_CONTEXTS + { "thread", simgrid::simix::thread_factory }, +#endif +}; + +static_assert(sizeof(context_factories) != 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; + } + return res; +} + +static simgrid::config::Flag context_factory_name( + "contexts/factory", + (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; -#ifdef HAVE_THREAD_LOCAL_STORAGE +#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; @@ -50,61 +91,54 @@ 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(void) +static inline +void invalid_context_factory() { -#if defined(HAVE_THREAD_CONTEXTS) && !defined(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); -#endif - if (!simix_global->context_factory) { - /* select the context factory to use to create the contexts */ - if (simgrid::simix::factory_initializer) - simix_global->context_factory = simgrid::simix::factory_initializer(); - else { /* use the factory specified by --cfg=contexts/factory:value */ -#if defined(HAVE_THREAD_CONTEXTS) - if (!strcmp(smx_context_factory_name, "thread")) - simix_global->context_factory = simgrid::simix::thread_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 - if (0); -#endif -#ifdef HAVE_UCONTEXT_CONTEXTS - else if (!strcmp(smx_context_factory_name, "ucontext")) - simix_global->context_factory = simgrid::simix::sysv_factory(); -#endif -#ifdef HAVE_RAW_CONTEXTS - else if (!strcmp(smx_context_factory_name, "raw")) - simix_global->context_factory = simgrid::simix::raw_factory(); + XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)"); #endif -#ifdef HAVE_BOOST_CONTEXTS - else if (!strcmp(smx_context_factory_name, "boost")) - simix_global->context_factory = simgrid::simix::boost_factory(); -#endif - else { - XBT_ERROR("Invalid context factory specified. Valid factories on this machine:"); -#ifdef HAVE_RAW_CONTEXTS - XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid"); +#if HAVE_UCONTEXT_CONTEXTS + XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); #else - XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)"); + XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)"); #endif -#ifdef HAVE_UCONTEXT_CONTEXTS - XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); +#if HAVE_BOOST_CONTEXTS + XBT_ERROR(" boost: this uses the boost libraries context implementation"); #else - XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)"); + 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 -#ifdef 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?)"); + 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) +{ +#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); #endif - XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc"); - xbt_die("Please use a valid factory."); - } - } + if (simix_global->context_factory) + return; + /* 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(); + 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) + invalid_context_factory(); } /** @@ -135,7 +169,7 @@ void *SIMIX_context_stack_new(void) #endif size_t size = smx_context_stack_size + smx_context_guard_size; -#ifdef HAVE_MC +#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); @@ -160,7 +194,7 @@ void *SIMIX_context_stack_new(void) stack = xbt_malloc0(smx_context_stack_size); } -#ifdef HAVE_VALGRIND_VALGRIND_H +#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 @@ -173,7 +207,7 @@ void SIMIX_context_stack_delete(void *stack) if (!stack) return; -#ifdef HAVE_VALGRIND_VALGRIND_H +#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); @@ -186,7 +220,7 @@ void SIMIX_context_stack_delete(void *stack) XBT_WARN("Failed to remove page protection: %s", strerror(errno)); /* try to pursue anyway */ } -#ifdef HAVE_MC +#if HAVE_MC /* Retrieve the saved pointer. See SIMIX_context_stack_new above. */ stack = *((void **)stack - 1); #endif @@ -225,7 +259,7 @@ void SIMIX_context_set_nthreads(int nb_threads) { nb_threads = xbt_os_get_numcores(); XBT_INFO("Auto-setting contexts/nthreads to %d",nb_threads); } -#ifndef HAVE_THREAD_CONTEXTS +#if !HAVE_THREAD_CONTEXTS xbt_assert(nb_threads == 1, "Parallel runs are impossible when the pthreads are missing."); #endif smx_parallel_contexts = nb_threads; @@ -282,7 +316,7 @@ void SIMIX_context_set_parallel_mode(e_xbt_parmap_mode_t mode) { smx_context_t SIMIX_context_get_current(void) { if (SIMIX_context_is_parallel()) { -#ifdef HAVE_THREAD_LOCAL_STORAGE +#if HAVE_THREAD_LOCAL_STORAGE return smx_current_context_parallel; #else return xbt_os_thread_get_specific(smx_current_context_key); @@ -300,7 +334,7 @@ smx_context_t SIMIX_context_get_current(void) void SIMIX_context_set_current(smx_context_t context) { if (SIMIX_context_is_parallel()) { -#ifdef HAVE_THREAD_LOCAL_STORAGE +#if HAVE_THREAD_LOCAL_STORAGE smx_current_context_parallel = context; #else xbt_os_thread_set_specific(smx_current_context_key, context);