X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/be5b1909ae03fa305b6aff11ef16e19de82966b5..a881c873c9afd5283e230587ae68d1b8b1b82fba:/src/simix/smx_context.cpp diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp index e88b271d35..84da19332f 100644 --- a/src/simix/smx_context.cpp +++ b/src/simix/smx_context.cpp @@ -6,18 +6,23 @@ /* 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" #include "smx_private.h" -#include "smx_private.hpp" #include "simgrid/sg_config.h" #include "src/internal_config.h" #include "simgrid/modelchecker.h" -#ifdef _XBT_WIN32 +#ifdef _WIN32 #include #include #else @@ -29,19 +34,53 @@ #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"); +XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mechanism"); + +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); -char* smx_context_factory_name = NULL; /* factory name specified by --cfg=contexts/factory:value */ 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; @@ -51,61 +90,54 @@ 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 system threads (pthreads on UNIX, CreateThread() on windows)"); - 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(); } /** @@ -127,30 +159,29 @@ void *SIMIX_context_stack_new(void) if (smx_context_guard_size > 0 && !MC_is_active()) { -#if defined(_XBT_WIN32) || (PTH_STACKGROWTH != -1) +#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 you're on Windows or PTH_STACKGROWTH != -1 (current value is %d).", - PTH_STACKGROWTH); + 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; } #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); stack = alloc - ((uintptr_t)alloc & (xbt_pagesize - 1)) + xbt_pagesize; *((void **)stack - 1) = alloc; -#elif !defined(_XBT_WIN32) +#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 _XBT_WIN32 +#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 @@ -162,11 +193,9 @@ void *SIMIX_context_stack_new(void) stack = xbt_malloc0(smx_context_stack_size); } -#ifdef HAVE_VALGRIND_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); +#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; @@ -177,43 +206,36 @@ 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); + memcpy(&valgrind_stack_id, (char *)stack + smx_context_usable_stack_size, sizeof valgrind_stack_id); VALGRIND_STACK_DEREGISTER(valgrind_stack_id); #endif -#ifndef WIN32 +#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) { + 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 */ } -#ifdef HAVE_MC +#if HAVE_MC /* Retrieve the saved pointer. See SIMIX_context_stack_new above. */ stack = *((void **)stack - 1); #endif } -#endif +#endif /* not windows */ xbt_free(stack); } -/** - * \brief Returns whether some parallel threads are used - * for the user contexts. - * \return 1 if parallelism is used - */ +/** @brief Returns whether some parallel threads are used for the user contexts. */ int SIMIX_context_is_parallel(void) { return smx_parallel_contexts > 1; } /** - * \brief Returns the number of parallel threads used - * for the user contexts. + * @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(void) { @@ -235,12 +257,9 @@ void SIMIX_context_set_nthreads(int nb_threads) { nb_threads = xbt_os_get_numcores(); XBT_INFO("Auto-setting contexts/nthreads to %d",nb_threads); } - - if (nb_threads > 1) { -#ifndef HAVE_THREAD_CONTEXTS - THROWF(arg_error, 0, "The thread factory cannot be run in parallel"); +#if !HAVE_THREAD_CONTEXTS + xbt_assert(nb_threads == 1, "Parallel runs are impossible when the pthreads are missing."); #endif - } smx_parallel_contexts = nb_threads; } @@ -295,7 +314,7 @@ 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); @@ -313,7 +332,7 @@ 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);