X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/1cde906ff21eb6a3dd34cce742b544e1ddcb8994..866550c0a0ea154753da12952a154cb71dfb8264:/src/simix/smx_context_sysv.c diff --git a/src/simix/smx_context_sysv.c b/src/simix/smx_context_sysv.c index 5834354e0b..7f2c5c34c7 100644 --- a/src/simix/smx_context_sysv.c +++ b/src/simix/smx_context_sysv.c @@ -1,228 +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 */ -#include "portable.h" -#include /* context relative declarations */ -/* lower this if you want to reduce the memory consumption */ -#define STACK_SIZE 128*1024 +#ifdef _XBT_WIN32 +# include /* context relative declarations */ +#else +# include /* context relative declarations */ +#endif #ifdef HAVE_VALGRIND_VALGRIND_H # include -#endif /* HAVE_VALGRIND_VALGRIND_H */ +#endif /* HAVE_VALGRIND_VALGRIND_H */ 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 */ - struct s_smx_ctx_sysv *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; - -/* 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 smx_context_t -smx_ctx_sysv_factory_create_context(xbt_main_func_t code, int argc, char** argv, - void_f_pvoid_t cleanup_func, void* cleanup_arg); +#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_factory_create_maestro_context(void); - +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 void smx_ctx_sysv_start(smx_context_t context); - -static void smx_ctx_sysv_stop(smx_context_t context); - -static void smx_ctx_sysv_suspend(smx_context_t context); - -static void - smx_ctx_sysv_resume(smx_context_t old_context, smx_context_t new_context); - -static void smx_ctx_sysv_wrapper(void); - -/* callback: context fetching */ -static ex_ctx_t *xbt_ctx_sysv_ex_ctx(void) -{ - /*FIXME: the factory should access simix level datastructures! */ - return simix_global->current_process->context->exception; -} - -/* callback: termination */ -static void xbt_ctx_sysv_ex_terminate(xbt_ex_t * e) -{ - xbt_ex_display(e); - abort(); -} +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) { - *factory = xbt_new0(s_smx_context_factory_t, 1); + smx_ctx_base_factory_init(factory); + XBT_VERB("Activating SYSV context factory"); - (*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)->create_context = smx_ctx_sysv_create_context; + /* Do not overload that method (*factory)->finalize */ (*factory)->free = smx_ctx_sysv_free; - (*factory)->start = smx_ctx_sysv_start; - (*factory)->stop = smx_ctx_sysv_stop; - (*factory)->suspend = smx_ctx_sysv_suspend; - (*factory)->resume = smx_ctx_sysv_resume; (*factory)->name = "smx_sysv_context_factory"; - /* context exception handlers */ - __xbt_ex_ctx = xbt_ctx_sysv_ex_ctx; - __xbt_ex_terminate = xbt_ctx_sysv_ex_terminate; + 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); + 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; + } +} + +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); } -static smx_context_t smx_ctx_sysv_factory_create_maestro_context() +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) { - smx_ctx_sysv_t context = xbt_new0(s_smx_ctx_sysv_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); - context->exception = xbt_new(ex_ctx_t, 1); - XBT_CTX_INITIALIZE(context->exception); + /* if the user provided a function for the process then use it, + otherwise it is the context for maestro */ + if (code) { - return (smx_context_t)context; -} + getcontext(&(context->uc)); -static int smx_ctx_sysv_factory_finalize(smx_context_factory_t * factory) -{ - /*FIXME free(maestro_context->exception);*/ - free(*factory); - *factory = NULL; - return 0; + context->uc.uc_link = NULL; + + context->uc.uc_stack.ss_sp = + pth_skaddr_makecontext(context->stack, smx_context_stack_size); + + context->uc.uc_stack.ss_size = + pth_sksize_makecontext(context->stack, smx_context_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 */ + 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 smx_context_t -smx_ctx_sysv_factory_create_context(xbt_main_func_t code, int argc, char** argv, - void_f_pvoid_t cleanup_func, void* cleanup_arg) +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) { - smx_ctx_sysv_t context = xbt_new0(s_smx_ctx_sysv_t, 1); - context->code = code; + return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size, + code, argc, argv, cleanup_func, + data); - 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); - context->argc = argc; - context->argv = argv; - context->cleanup_func = cleanup_func; - context->cleanup_arg = cleanup_arg; - return (smx_context_t)context; } -static void smx_ctx_sysv_free(smx_context_t pcontext) +static void smx_ctx_sysv_free(smx_context_t context) { - int i; - smx_ctx_sysv_t context = (smx_ctx_sysv_t)pcontext; - 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 */ - - /* free argv */ - if (context->argv) { - for (i = 0; i < context->argc; i++) - if (context->argv[i]) - free(context->argv[i]); - - free(context->argv); - } - - /* destroy the context */ - free(context); + VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) + context)->valgrind_stack_id); +#endif /* HAVE_VALGRIND_VALGRIND_H */ + } + smx_ctx_base_free(context); } -static void smx_ctx_sysv_start(smx_context_t context) -{ - makecontext(&((smx_ctx_sysv_t)context)->uc, smx_ctx_sysv_wrapper, 0); +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); + + simix_global->context_factory->stop((smx_context_t) context); } -static void smx_ctx_sysv_stop(smx_context_t pcontext) +static void smx_ctx_sysv_stop_serial(smx_context_t context) { - smx_ctx_sysv_t context = (smx_ctx_sysv_t)pcontext; - - if (context->cleanup_func) - (*context->cleanup_func) (context->cleanup_arg); - - smx_ctx_sysv_suspend((smx_context_t)context); + smx_ctx_base_stop(context); + smx_ctx_sysv_suspend_serial(context); } -static void smx_ctx_sysv_wrapper() +static void smx_ctx_sysv_suspend_serial(smx_context_t context) { - /*FIXME: I would like to avoid accesing simix_global to get the current - context by passing it as an argument of the wrapper function. The problem - is that this function is called from smx_ctx_sysv_start, and uses - makecontext for calling it, and the stupid posix specification states that - all the arguments of the function should be int(32 bits), making it useless - in 64-bit architectures where pointers are 64 bit long. - */ - smx_ctx_sysv_t context = - (smx_ctx_sysv_t)simix_global->current_process->context; - - (context->code) (context->argc, context->argv); - - smx_ctx_sysv_stop((smx_context_t)context); + /* 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_suspend(smx_context_t context) +static void smx_ctx_sysv_resume_serial(smx_process_t first_process) { - int rv; - - smx_ctx_sysv_t prev_context = ((smx_ctx_sysv_t) context)->prev; + smx_context_t context = first_process->context; + SIMIX_context_set_current(context); + swapcontext(&sysv_maestro_context->uc, + &((smx_ctx_sysv_t) context)->uc); +} - ((smx_ctx_sysv_t) context)->prev = NULL; +static void smx_ctx_sysv_runall_serial(void) +{ + 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; - rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &prev_context->uc); + /* execute the first process */ + smx_ctx_sysv_resume_serial(first_process); + } +} - xbt_assert0((rv == 0), "Context swapping failure"); +static void smx_ctx_sysv_stop_parallel(smx_context_t context) +{ + smx_ctx_base_stop(context); + smx_ctx_sysv_suspend_parallel(context); } -static void -smx_ctx_sysv_resume(smx_context_t old_context, smx_context_t new_context) +static void smx_ctx_sysv_suspend_parallel(smx_context_t context) { - int rv; +#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]; + } - ((smx_ctx_sysv_t) new_context)->prev = (smx_ctx_sysv_t)old_context; + SIMIX_context_set_current(next_context); + swapcontext(&((smx_ctx_sysv_t) context)->uc, next_stack); +#endif +} - rv = swapcontext(&((smx_ctx_sysv_t)old_context)->uc, - &((smx_ctx_sysv_t)new_context)->uc); +static void smx_ctx_sysv_resume_parallel(smx_process_t first_process) +{ +#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 }