X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ee781feec002b4257cbb3cf05bb226c7ccba8c78..21ff871b376f66fa4b2477042fe5ef5fbf42a6fe:/src/simix/smx_context.cpp diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp index 83424f0abb..67cb04a7f5 100644 --- a/src/simix/smx_context.cpp +++ b/src/simix/smx_context.cpp @@ -1,27 +1,28 @@ /* a fast and simple context switching library */ -/* Copyright (c) 2009-2015. The SimGrid Team. - * All rights reserved. */ +/* Copyright (c) 2009-2017. 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 +#include #include +#include +#include "simgrid/modelchecker.h" +#include "simgrid/sg_config.h" +#include "smx_private.hpp" #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 _WIN32 #include @@ -30,10 +31,10 @@ #include #endif -#ifdef __MINGW32__ -#define _aligned_malloc __mingw_aligned_malloc -#define _aligned_free __mingw_aligned_free -#endif //MINGW +#ifdef __MINGW32__ +#define _aligned_malloc __mingw_aligned_malloc +#define _aligned_free __mingw_aligned_free +#endif /*MINGW*/ #if HAVE_VALGRIND_H # include @@ -41,23 +42,22 @@ 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 }, + { "boost", &simgrid::kernel::context::boost_factory }, #endif #if HAVE_THREAD_CONTEXTS - { "thread", simgrid::simix::thread_factory }, + { "thread", &simgrid::kernel::context::thread_factory }, #endif }; -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 @@ -77,9 +77,9 @@ static simgrid::config::Flag context_factory_name( (std::string("Possible values: ")+contexts_list()).c_str(), context_factories[0].first); -int smx_context_stack_size; +unsigned smx_context_stack_size; int smx_context_stack_size_was_set = 0; -int smx_context_guard_size; +unsigned 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; @@ -91,44 +91,35 @@ 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 + xbt_assert(simix_global->context_factory == nullptr); + +#if HAVE_THREAD_CONTEXTS && not 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) - return; + +#if defined(__APPLE__) || defined(__NetBSD__) + if (context_factory_name == std::string("thread") && xbt_cfg_get_string("smpi/privatization") == "dlopen") { + XBT_WARN("dlopen+thread broken on Apple and BSD. Switching to raw contexts."); + context_factory_name = "raw"; + } +#endif +#if defined(__FreeBSD__) + if (context_factory_name == std::string("thread") && xbt_cfg_get_string("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) { // 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 */ @@ -137,20 +128,39 @@ void SIMIX_context_mod_init(void) simix_global->context_factory = factory.second(); break; } - if (simix_global->context_factory == nullptr) - invalid_context_factory(); + + 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(void) +void SIMIX_context_mod_exit() { delete simix_global->context_factory; simix_global->context_factory = nullptr; } -void *SIMIX_context_stack_new(void) +void *SIMIX_context_stack_new() { void *stack; @@ -158,19 +168,19 @@ void *SIMIX_context_stack_new(void) * 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 (smx_context_guard_size > 0 && not MC_is_active()) { #if !defined(PTH_STACKGROWTH) || (PTH_STACKGROWTH != -1) static int warned_once = 0; - if (!warned_once) { + if (not 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; } #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 +#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; @@ -184,9 +194,13 @@ void *SIMIX_context_stack_new(void) #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. */ + 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; @@ -204,7 +218,7 @@ void *SIMIX_context_stack_new(void) void SIMIX_context_stack_delete(void *stack) { - if (!stack) + if (not stack) return; #if HAVE_VALGRIND_H @@ -214,13 +228,13 @@ void SIMIX_context_stack_delete(void *stack) #endif #ifndef _WIN32 - if (smx_context_guard_size > 0 && !MC_is_active()) { + 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 HAVE_MC +#if SIMGRID_HAVE_MC /* Retrieve the saved pointer. See SIMIX_context_stack_new above. */ stack = *((void **)stack - 1); #endif @@ -231,16 +245,15 @@ void SIMIX_context_stack_delete(void *stack) } /** @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. + * @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) { +int SIMIX_context_get_nthreads() { return smx_parallel_contexts; } @@ -255,10 +268,10 @@ int SIMIX_context_get_nthreads(void) { * \param nb_threads the number of threads to use */ void SIMIX_context_set_nthreads(int nb_threads) { - if (nb_threads<=0) { + 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 @@ -274,7 +287,7 @@ void SIMIX_context_set_nthreads(int nb_threads) { * \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; } @@ -296,7 +309,7 @@ void SIMIX_context_set_parallel_threshold(int threshold) { * 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; } @@ -313,7 +326,7 @@ void SIMIX_context_set_parallel_mode(e_xbt_parmap_mode_t mode) { * \brief Returns the current context of this thread. * \return the current context of this thread */ -smx_context_t SIMIX_context_get_current(void) +smx_context_t SIMIX_context_get_current() { if (SIMIX_context_is_parallel()) { #if HAVE_THREAD_LOCAL_STORAGE