X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/9b73466ada27682d1729f394549479da83ef4a99..7c8305c54672b658f9f230f281c4d5ea4bbee147:/src/simix/smx_context.c diff --git a/src/simix/smx_context.c b/src/simix/smx_context.c index e638bb7e76..a801c0451b 100644 --- a/src/simix/smx_context.c +++ b/src/simix/smx_context.c @@ -1,28 +1,48 @@ /* a fast and simple context switching library */ -/* Copyright (c) 2009-2013. The SimGrid Team. +/* Copyright (c) 2009-2015. 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 "portable.h" +#include "src/portable.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 "internal_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 + +#ifdef HAVE_VALGRIND_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 */ smx_ctx_factory_initializer_t smx_factory_initializer_to_use = NULL; -int smx_context_stack_size = 128 * 1024; +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 -static __thread smx_context_t smx_current_context_parallel; +static XBT_THREAD_LOCAL smx_context_t smx_current_context_parallel; #else static xbt_os_thread_key_t smx_current_context_key = 0; #endif @@ -64,18 +84,29 @@ void SIMIX_context_mod_init(void) /* use raw contexts */ SIMIX_ctx_raw_factory_init(&simix_global->context_factory); } +#endif +#ifdef HAVE_BOOST_CONTEXT + else if (!strcmp(smx_context_factory_name, "boost")) { + /* use Boost.Context */ + SIMIX_ctx_boost_factory_init(&simix_global->context_factory); + } #endif else { XBT_ERROR("Invalid context factory specified. Valid factories on this machine:"); #ifdef HAVE_RAWCTX XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid"); #else - XBT_ERROR(" (raw contexts are disabled at compilation time on this machine -- check configure logs for details)"); + XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)"); #endif #ifdef CONTEXT_UCONTEXT XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); #else - XBT_ERROR(" (ucontext is 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_BOOST_CONTEXT + 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 system threads (pthreads on UNIX, CreateThread() on windows)"); xbt_die("Please use a valid factory."); @@ -99,6 +130,91 @@ void SIMIX_context_mod_exit(void) xbt_dict_remove((xbt_dict_t) _sg_cfg_set,"contexts/factory"); } +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(_XBT_WIN32) || (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); + warned_once = 1; + } +#endif + + size_t size = smx_context_stack_size + smx_context_guard_size; +#ifdef HAVE_MC + /* Cannot use posix_memalign when HAVE_MC. Align stack by hand, and save the + * pointer returned by xbt_malloc0. */ + char *alloc = xbt_malloc0(size + xbt_pagesize); + stack = alloc - ((uintptr_t)alloc & (xbt_pagesize - 1)) + xbt_pagesize; + *((void **)stack - 1) = alloc; +#elif !defined(_XBT_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 + 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. */ + } +#endif + stack = (char *)stack + smx_context_guard_size; + } else { + 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); +#endif + + return stack; +} + +void SIMIX_context_stack_delete(void *stack) +{ + if (!stack) + return; + +#ifdef HAVE_VALGRIND_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 */ + } +#ifdef HAVE_MC + /* Retrieve the saved pointer. See SIMIX_context_stack_new above. */ + stack = *((void **)stack - 1); +#endif + } +#endif + + xbt_free(stack); +} + /** * \brief Returns whether some parallel threads are used * for the user contexts. @@ -127,7 +243,7 @@ XBT_INLINE int SIMIX_context_get_nthreads(void) { * * \param nb_threads the number of threads to use */ -XBT_INLINE void SIMIX_context_set_nthreads(int nb_threads) { +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);