X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d683520a4fa56accfe70e693d9336dd740f7bf35..8f3905e6e13d9511eb3002f9bdeb30e147e76056:/src/simix/smx_context_sysv.c diff --git a/src/simix/smx_context_sysv.c b/src/simix/smx_context_sysv.c index 0638d97f35..437db9f5d8 100644 --- a/src/simix/smx_context_sysv.c +++ b/src/simix/smx_context_sysv.c @@ -1,282 +1,320 @@ -/* $Id$ */ +/* context_sysv - context switching with ucontextes from System V */ -/* context_sysv - implementation of context switching with ucontextes from Sys V */ +/* Copyright (c) 2009, 2010. The SimGrid Team. + * All rights reserved. */ -/* Copyright (c) 2004-2008 the SimGrid team. All right 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. */ -/* 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 "xbt/ex_interface.h" -#include "private.h" +#include "xbt/parmap.h" +#include "simix/private.h" +#include "gras_config.h" +#include "context_sysv_config.h" /* loads context system definitions */ + +#ifdef _XBT_WIN32 +# include /* context relative declarations */ +#else +# include /* context relative declarations */ +#endif -#include "context_sysv_config.h" /* loads context system definitions */ -#include "portable.h" -#include /* context relative declarations */ -#define STACK_SIZE 128*1024 /* lower this if you want to reduce the memory consumption */ #ifdef HAVE_VALGRIND_VALGRIND_H # include -#endif /* HAVE_VALGRIND_VALGRIND_H */ +#endif /* HAVE_VALGRIND_VALGRIND_H */ -XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(smx_context); +XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context); typedef struct s_smx_ctx_sysv { - SMX_CTX_BASE_T; - ucontext_t uc; /* the thread that execute the code */ - char stack[STACK_SIZE]; /* the thread stack size */ - smx_process_t prev; /* the previous process */ + s_smx_ctx_base_t super; /* Fields of super implementation */ + ucontext_t uc; /* the ucontext that executes the code */ #ifdef HAVE_VALGRIND_VALGRIND_H unsigned int valgrind_stack_id; /* the valgrind stack id */ -#endif +#endif + char stack[0]; /* the thread stack (must remain the last element of the structure) */ } s_smx_ctx_sysv_t, *smx_ctx_sysv_t; +#ifdef CONTEXT_THREADS +static xbt_parmap_t sysv_parmap; +static ucontext_t* sysv_workers_stacks; /* space to save the worker's stack in each thread */ +static unsigned long sysv_threads_working; /* number of threads that have started their work */ +static xbt_os_thread_key_t sysv_worker_id_key; /* thread-specific storage for the thread id */ +#endif +static unsigned long sysv_process_index = 0; /* index of the next process to run in the + * list of runnable processes */ +static smx_ctx_sysv_t sysv_maestro_context; + +static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory); +static smx_context_t +smx_ctx_sysv_create_context_sized(size_t structure_size, + xbt_main_func_t code, int argc, + char **argv, + void_pfn_smxprocess_t cleanup_func, + void *data); +static void smx_ctx_sysv_free(smx_context_t context); +static smx_context_t smx_ctx_sysv_self_parallel(void); +static smx_context_t +smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv, + void_pfn_smxprocess_t cleanup_func, void* data); + +static void smx_ctx_sysv_wrapper(int count, ...); + +static void smx_ctx_sysv_stop_serial(smx_context_t context); +static void smx_ctx_sysv_suspend_serial(smx_context_t context); +static void smx_ctx_sysv_resume_serial(smx_process_t first_process); +static void smx_ctx_sysv_runall_serial(void); + +static void smx_ctx_sysv_stop_parallel(smx_context_t context); +static void smx_ctx_sysv_suspend_parallel(smx_context_t context); +static void smx_ctx_sysv_resume_parallel(smx_process_t first_process); +static void smx_ctx_sysv_runall_parallel(void); + +/* This is a bit paranoid about SIZEOF_VOIDP not being a multiple of SIZEOF_INT, + * but it doesn't harm. */ +#define CTX_ADDR_LEN (SIZEOF_VOIDP / SIZEOF_INT + !!(SIZEOF_VOIDP % SIZEOF_INT)) +union u_ctx_addr { + void *addr; + int intv[CTX_ADDR_LEN]; +}; +#if (CTX_ADDR_LEN == 1) +# define CTX_ADDR_SPLIT(u) (u).intv[0] +#elif (CTX_ADDR_LEN == 2) +# define CTX_ADDR_SPLIT(u) (u).intv[0], (u).intv[1] +#else +# error Your architecture is not supported yet +#endif + +void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory) +{ + smx_ctx_base_factory_init(factory); + XBT_VERB("Activating SYSV context factory"); -/* callback: context fetching */ -static ex_ctx_t *xbt_jcontext_ex_ctx(void); - -/* callback: termination */ -static void xbt_jcontext_ex_terminate(xbt_ex_t * e); - -static int -smx_ctx_sysv_factory_create_context(smx_process_t *smx_process, xbt_main_func_t code); - -static int smx_ctx_sysv_factory_finalize(smx_context_factory_t * factory); - -static int smx_ctx_sysv_factory_create_maestro_context(smx_process_t * maestro); - -static void smx_ctx_sysv_free(smx_process_t process); - -static void smx_ctx_sysv_kill(smx_process_t process); - -static void smx_ctx_sysv_schedule(smx_process_t process); - -static void smx_ctx_sysv_yield(void); - -static void smx_ctx_sysv_start(smx_process_t process); - -static void smx_ctx_sysv_stop(int exit_code); - -static void smx_ctx_sysv_swap(smx_process_t process); - -static void smx_ctx_sysv_schedule(smx_process_t process); - -static void smx_ctx_sysv_yield(void); - -static void smx_ctx_sysv_suspend(smx_process_t process); - -static void smx_ctx_sysv_resume(smx_process_t process); - -static void smx_ctx_sysv_wrapper(void); + (*factory)->finalize = smx_ctx_sysv_factory_finalize; + (*factory)->create_context = smx_ctx_sysv_create_context; + /* Do not overload that method (*factory)->finalize */ + (*factory)->free = smx_ctx_sysv_free; + (*factory)->name = "smx_sysv_context_factory"; -/* callback: context fetching */ -static ex_ctx_t *xbt_ctx_sysv_ex_ctx(void) -{ - return simix_global->current_process->context->exception; + if (SIMIX_context_is_parallel()) { +#ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */ + int nthreads = SIMIX_context_get_nthreads(); + sysv_parmap = xbt_parmap_new(nthreads, SIMIX_context_get_parallel_mode()); + sysv_workers_stacks = xbt_new(ucontext_t, nthreads); + xbt_os_thread_key_create(&sysv_worker_id_key); + (*factory)->stop = smx_ctx_sysv_stop_parallel; + (*factory)->suspend = smx_ctx_sysv_suspend_parallel; + (*factory)->runall = smx_ctx_sysv_runall_parallel; +#else + THROWF(arg_error, 0, "No thread support for parallel context execution"); +#endif + } else { + (*factory)->stop = smx_ctx_sysv_stop_serial; + (*factory)->suspend = smx_ctx_sysv_suspend_serial; + (*factory)->runall = smx_ctx_sysv_runall_serial; + } } -/* callback: termination */ -static void xbt_ctx_sysv_ex_terminate(xbt_ex_t * e) -{ - xbt_ex_display(e); - abort(); +static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory) +{ +#ifdef CONTEXT_THREADS + if (sysv_parmap) + xbt_parmap_destroy(sysv_parmap); + xbt_free(sysv_workers_stacks); +#endif + return smx_ctx_base_factory_finalize(factory); } -void SIMIX_ctx_sysv_factory_init(smx_context_factory_t * factory) +static smx_context_t +smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code, + int argc, char **argv, + void_pfn_smxprocess_t cleanup_func, + void *data) { - *factory = xbt_new0(s_smx_context_factory_t, 1); + union u_ctx_addr ctx_addr; + smx_ctx_sysv_t context = + (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size, + code, + argc, + argv, + cleanup_func, + data); - (*factory)->create_context = smx_ctx_sysv_factory_create_context; - (*factory)->finalize = smx_ctx_sysv_factory_finalize; - (*factory)->create_maestro_context = smx_ctx_sysv_factory_create_maestro_context; - (*factory)->free = smx_ctx_sysv_free; - (*factory)->kill = smx_ctx_sysv_kill; - (*factory)->schedule = smx_ctx_sysv_schedule; - (*factory)->yield = smx_ctx_sysv_yield; - (*factory)->start = smx_ctx_sysv_start; - (*factory)->stop = smx_ctx_sysv_stop; - (*factory)->name = "smx_sysv_context_factory"; + /* if the user provided a function for the process then use it, + otherwise it is the context for maestro */ + if (code) { - /* context exception handlers */ - __xbt_ex_ctx = xbt_ctx_sysv_ex_ctx; - __xbt_ex_terminate = xbt_ctx_sysv_ex_terminate; -} + getcontext(&(context->uc)); -static int smx_ctx_sysv_factory_create_maestro_context(smx_process_t *maestro) -{ - smx_ctx_sysv_t context = xbt_new0(s_smx_ctx_sysv_t, 1); + context->uc.uc_link = NULL; - context->exception = xbt_new(ex_ctx_t, 1); - XBT_CTX_INITIALIZE(context->exception); + context->uc.uc_stack.ss_sp = + pth_skaddr_makecontext(context->stack, smx_context_stack_size); - (*maestro)->context = (smx_context_t) context; + context->uc.uc_stack.ss_size = + pth_sksize_makecontext(context->stack, smx_context_stack_size); - return 0; +#ifdef HAVE_VALGRIND_VALGRIND_H + context->valgrind_stack_id = + VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp, + ((char *) context->uc.uc_stack.ss_sp) + + context->uc.uc_stack.ss_size); +#endif /* HAVE_VALGRIND_VALGRIND_H */ + ctx_addr.addr = context; + makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper, + CTX_ADDR_LEN, CTX_ADDR_SPLIT(ctx_addr)); + } else { + sysv_maestro_context = context; + } + return (smx_context_t) context; } -static int smx_ctx_sysv_factory_finalize(smx_context_factory_t * factory) +static smx_context_t +smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv, + void_pfn_smxprocess_t cleanup_func, + void *data) { - /*FIXME free(maestro_context->exception);*/ - free(*factory); - *factory = NULL; - return 0; -} -static int -smx_ctx_sysv_factory_create_context(smx_process_t *smx_process, xbt_main_func_t code) -{ - VERB1("Create context %s", (*smx_process)->name); - smx_ctx_sysv_t context = xbt_new0(s_smx_ctx_sysv_t, 1); - - context->code = code; - - xbt_assert2(getcontext(&(context->uc)) == 0, - "Error in context saving: %d (%s)", errno, strerror(errno)); - context->uc.uc_link = NULL; - context->uc.uc_stack.ss_sp = - pth_skaddr_makecontext(context->stack, STACK_SIZE); - context->uc.uc_stack.ss_size = - pth_sksize_makecontext(context->stack, STACK_SIZE); -#ifdef HAVE_VALGRIND_VALGRIND_H - context->valgrind_stack_id = - VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp, - ((char *) context->uc.uc_stack.ss_sp) + - context->uc.uc_stack.ss_size); -#endif /* HAVE_VALGRIND_VALGRIND_H */ - - context->exception = xbt_new(ex_ctx_t, 1); - XBT_CTX_INITIALIZE(context->exception); - (*smx_process)->context = (smx_context_t)context; - (*smx_process)->iwannadie = 0; - - /* FIXME: Check what should return */ - return 1; + return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size, + code, argc, argv, cleanup_func, + data); + } -static void smx_ctx_sysv_free(smx_process_t process) +static void smx_ctx_sysv_free(smx_context_t context) { - smx_ctx_sysv_t context = (smx_ctx_sysv_t)process->context; - if (context){ - if (context->exception) - free(context->exception); + if (context) { #ifdef HAVE_VALGRIND_VALGRIND_H - VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) context)->valgrind_stack_id); -#endif /* HAVE_VALGRIND_VALGRIND_H */ + VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) + context)->valgrind_stack_id); +#endif /* HAVE_VALGRIND_VALGRIND_H */ - /* destroy the context */ - free(context); } + smx_ctx_base_free(context); } -static void smx_ctx_sysv_kill(smx_process_t process) -{ - DEBUG2("Kill process '%s' (from '%s')", process->name, - simix_global->current_process->name); - process->iwannadie = 1; - smx_ctx_sysv_swap(process); -} +static void smx_ctx_sysv_wrapper(int first, ...) +{ + union u_ctx_addr ctx_addr; + smx_ctx_sysv_t context; + + ctx_addr.intv[0] = first; + if (CTX_ADDR_LEN > 1) { + va_list ap; + int i; + va_start(ap, first); + for (i = 1; i < CTX_ADDR_LEN; i++) + ctx_addr.intv[i] = va_arg(ap, int); + va_end(ap); + } + context = ctx_addr.addr; + (context->super.code) (context->super.argc, context->super.argv); -/** - * \param context the winner - * - * Calling this function blocks the current context and schedule \a context. - * When \a context will call xbt_context_yield, it will return - * to this function as if nothing had happened. - * - * Only the maestro can call this function to run a given process. - */ -static void smx_ctx_sysv_schedule(smx_process_t process) -{ - DEBUG1("Schedule process '%s'", process->name); - xbt_assert0((simix_global->current_process == simix_global->maestro_process), - "You are not supposed to run this function here!"); - smx_ctx_sysv_swap(process); + simix_global->context_factory->stop((smx_context_t) context); } -/** - * Calling this function makes the current context yield. The context - * that scheduled it returns from xbt_context_schedule as if nothing - * had happened. - * - * Only the processes can call this function, giving back the control - * to the maestro - */ -static void smx_ctx_sysv_yield(void) +static void smx_ctx_sysv_stop_serial(smx_context_t context) { - DEBUG1("Yielding process '%s'", simix_global->current_process->name); - xbt_assert0((simix_global->current_process != simix_global->maestro_process), - "You are not supposed to run this function here!"); - smx_ctx_sysv_swap(simix_global->current_process); + smx_ctx_base_stop(context); + smx_ctx_sysv_suspend_serial(context); } -static void smx_ctx_sysv_start(smx_process_t process) +static void smx_ctx_sysv_suspend_serial(smx_context_t context) { - /*DEBUG1("Start context '%s'", context->name);*/ - makecontext(&(((smx_ctx_sysv_t) process->context)->uc), smx_ctx_sysv_wrapper, 0); + /* determine the next context */ + smx_context_t next_context; + unsigned long int i = sysv_process_index++; + + if (i < xbt_dynar_length(simix_global->process_to_run)) { + /* execute the next process */ + XBT_DEBUG("Run next process"); + next_context = xbt_dynar_get_as( + simix_global->process_to_run,i, smx_process_t)->context; + } + else { + /* all processes were run, return to maestro */ + XBT_DEBUG("No more process to run"); + next_context = (smx_context_t) sysv_maestro_context; + } + SIMIX_context_set_current(next_context); + swapcontext(&((smx_ctx_sysv_t) context)->uc, + &((smx_ctx_sysv_t) next_context)->uc); } -static void smx_ctx_sysv_stop(int exit_code) +static void smx_ctx_sysv_resume_serial(smx_process_t first_process) { - /* please no debug here: our procdata was already free'd */ - if (simix_global->current_process->cleanup_func) - ((*simix_global->current_process->cleanup_func)) (simix_global->current_process->cleanup_arg); - - smx_ctx_sysv_swap(simix_global->current_process); + smx_context_t context = first_process->context; + SIMIX_context_set_current(context); + swapcontext(&sysv_maestro_context->uc, + &((smx_ctx_sysv_t) context)->uc); } -static void smx_ctx_sysv_swap(smx_process_t process) +static void smx_ctx_sysv_runall_serial(void) { - DEBUG2("Swap context: '%s' -> '%s'", simix_global->current_process->name, process->name); - xbt_assert0(simix_global->current_process, "You have to call context_init() first."); - xbt_assert0(process, "Invalid argument"); - - if (((smx_ctx_sysv_t) process->context)->prev == NULL) - smx_ctx_sysv_resume(process); - else - smx_ctx_sysv_suspend(process); + if (!xbt_dynar_is_empty(simix_global->process_to_run)) { + smx_process_t first_process = + xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t); + sysv_process_index = 1; - if (simix_global->current_process->iwannadie) - smx_ctx_sysv_stop(1); + /* execute the first process */ + smx_ctx_sysv_resume_serial(first_process); + } } -static void smx_ctx_sysv_wrapper(void) +static void smx_ctx_sysv_stop_parallel(smx_context_t context) { - smx_ctx_sysv_stop((*(simix_global->current_process->context->code)) - (simix_global->current_process->argc, simix_global->current_process->argv)); + smx_ctx_base_stop(context); + smx_ctx_sysv_suspend_parallel(context); } -static void smx_ctx_sysv_suspend(smx_process_t process) +static void smx_ctx_sysv_suspend_parallel(smx_context_t context) { - int rv; - - DEBUG1("Suspend context: '%s'", simix_global->current_process->name); - smx_process_t prev_process = ((smx_ctx_sysv_t) process->context)->prev; - - simix_global->current_process = prev_process; - - ((smx_ctx_sysv_t) process->context)->prev = NULL; - - rv = swapcontext(&(((smx_ctx_sysv_t) process->context)->uc), &(((smx_ctx_sysv_t)prev_process->context)->uc)); +#ifdef CONTEXT_THREADS + /* determine the next context */ + smx_process_t next_work = xbt_parmap_next(sysv_parmap); + smx_context_t next_context; + ucontext_t* next_stack; + + if (next_work != NULL) { + /* there is a next process to resume */ + XBT_DEBUG("Run next process"); + next_context = next_work->context; + next_stack = &((smx_ctx_sysv_t) next_context)->uc; + } + else { + /* all processes were run, go to the barrier */ + XBT_DEBUG("No more processes to run"); + next_context = (smx_context_t) sysv_maestro_context; + unsigned long worker_id = + (unsigned long) xbt_os_thread_get_specific(sysv_worker_id_key); + next_stack = &sysv_workers_stacks[worker_id]; + } - xbt_assert0((rv == 0), "Context swapping failure"); + SIMIX_context_set_current(next_context); + swapcontext(&((smx_ctx_sysv_t) context)->uc, next_stack); +#endif } -static void smx_ctx_sysv_resume(smx_process_t process) +static void smx_ctx_sysv_resume_parallel(smx_process_t first_process) { - int rv; - smx_ctx_sysv_t new_context = (smx_ctx_sysv_t)process->context; - smx_ctx_sysv_t prev_context = (smx_ctx_sysv_t)simix_global->current_process->context; - - DEBUG2("Resume context: '%s' (from '%s')", process->name, - simix_global->current_process->name); - - ((smx_ctx_sysv_t) process->context)->prev = simix_global->current_process; - - simix_global->current_process = process; - - rv = swapcontext(&prev_context->uc, &new_context->uc); +#ifdef CONTEXT_THREADS + unsigned long worker_id = __sync_fetch_and_add(&sysv_threads_working, 1); + xbt_os_thread_set_specific(sysv_worker_id_key, (void*) worker_id); + ucontext_t* worker_stack = &sysv_workers_stacks[worker_id]; + + smx_context_t context = first_process->context; + SIMIX_context_set_current(context); + swapcontext(worker_stack, &((smx_ctx_sysv_t) context)->uc); +#endif +} - xbt_assert0((rv == 0), "Context swapping failure"); +static void smx_ctx_sysv_runall_parallel(void) +{ +#ifdef CONTEXT_THREADS + sysv_threads_working = 0; + xbt_parmap_apply(sysv_parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel, + simix_global->process_to_run); +#endif }