X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/2985a0cbd8e2894ed7b19489b5f83130ff0dc22a..f9c6777834b0f2a277966c3e6725600d52619f43:/src/simix/smx_context_sysv.c diff --git a/src/simix/smx_context_sysv.c b/src/simix/smx_context_sysv.c index 1aba1d476e..c3e5ecac0f 100644 --- a/src/simix/smx_context_sysv.c +++ b/src/simix/smx_context_sysv.c @@ -1,188 +1,298 @@ -/* context_sysv - context switching with ucontextes from System V */ +/* context_sysv - context switching with ucontexts from System V */ -/* Copyright (c) 2009, 2010. The SimGrid Team. +/* Copyright (c) 2009-2014. 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. */ +/* 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 "smx_context_sysv_private.h" -#include "xbt/threadpool.h" -#include "simix/private.h" +#include -#ifdef HAVE_VALGRIND_VALGRIND_H -# include -#endif /* HAVE_VALGRIND_VALGRIND_H */ +#include "xbt/parmap.h" +#include "smx_private.h" +#include "internal_config.h" +#include "context_sysv_config.h" /* loads context system definitions */ +#include "mc/mc.h" #ifdef _XBT_WIN32 -#include "win32_ucontext.h" -#include "win32_ucontext.c" +# include /* context relative declarations */ #else -#include "ucontext.h" +# include /* context relative declarations */ #endif XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context); -static xbt_tpool_t tpool; +typedef struct s_smx_ctx_sysv { + s_smx_ctx_base_t super; /* Fields of super implementation */ + ucontext_t uc; /* the ucontext that executes the code */ + char *stack; /* the thread stack */ +} s_smx_ctx_sysv_t, *smx_ctx_sysv_t; + +#ifdef CONTEXT_THREADS +static xbt_parmap_t sysv_parmap; +static smx_ctx_sysv_t* sysv_workers_context; /* space to save the worker's context 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 void smx_ctx_sysv_free(smx_context_t context); 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); + void_pfn_smxprocess_t cleanup_func, smx_process_t process); + +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); -static void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context); +/* This is a bit paranoid about sizeof(smx_ctx_sysv_t) not being a multiple of + * sizeof(int), but it doesn't harm. */ +#define CTX_ADDR_LEN \ + (sizeof(smx_ctx_sysv_t) / sizeof(int) + \ + !!(sizeof(smx_ctx_sysv_t) % sizeof(int))) void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory) { smx_ctx_base_factory_init(factory); + XBT_VERB("Activating SYSV context factory"); (*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)->stop = smx_ctx_sysv_stop; - (*factory)->suspend = smx_ctx_sysv_suspend; (*factory)->name = "smx_sysv_context_factory"; - if(_surf_parallel_contexts){ - tpool = xbt_tpool_new(2, 10); + 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_context = xbt_new(smx_ctx_sysv_t, nthreads); + sysv_maestro_context = NULL; + 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{ - (*factory)->runall = smx_ctx_sysv_runall; +#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; } } -int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory) +static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory) { - if(tpool) - xbt_tpool_destroy(tpool); +#ifdef CONTEXT_THREADS + if (sysv_parmap) + xbt_parmap_destroy(sysv_parmap); + xbt_free(sysv_workers_context); +#endif return smx_ctx_base_factory_finalize(factory); } -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) +static smx_context_t +smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv, + void_pfn_smxprocess_t cleanup_func, + smx_process_t process) { - + int ctx_addr[CTX_ADDR_LEN]; smx_ctx_sysv_t context = - (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size, - code, - argc, - argv, - cleanup_func, - data); - - /* If the user provided a function for the process then use it - otherwise is the context for maestro */ + (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized( + sizeof(s_smx_ctx_sysv_t), + code, + argc, + argv, + cleanup_func, + process); + + /* if the user provided a function for the process then use it, + otherwise it is the context for maestro */ if (code) { - xbt_assert2(getcontext(&(context->uc)) == 0, - "Error in context saving: %d (%s)", errno, - strerror(errno)); + context->stack = SIMIX_context_stack_new(); + getcontext(&(context->uc)); context->uc.uc_link = NULL; context->uc.uc_stack.ss_sp = - pth_skaddr_makecontext(context->stack, CONTEXT_STACK_SIZE); + pth_skaddr_makecontext(context->stack, smx_context_usable_stack_size); context->uc.uc_stack.ss_size = - pth_sksize_makecontext(context->stack, 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 */ - - makecontext(&((smx_ctx_sysv_t) context)->uc, (void (*)())smx_ctx_sysv_wrapper, - sizeof(void*)/sizeof(int), context); + pth_sksize_makecontext(context->stack, smx_context_usable_stack_size); + + memcpy(ctx_addr, &context, sizeof(smx_ctx_sysv_t)); + switch (CTX_ADDR_LEN) { + case 1: + makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper, + 1, ctx_addr[0]); + break; + case 2: + makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper, + 2, ctx_addr[0], ctx_addr[1]); + break; + default: + xbt_die("Ucontexts are not supported on this arch yet (addr len = %zu/%zu = %zu)", + sizeof(smx_ctx_sysv_t), sizeof(int), CTX_ADDR_LEN); + } + } else { + if (process != NULL && sysv_maestro_context == NULL) + sysv_maestro_context = context; } - return (smx_context_t) context; - -} - -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) -{ - - return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t), - code, argc, argv, cleanup_func, - data); + if(MC_is_active() && code) + MC_new_stack_area(context->stack, ((smx_context_t)context)->process->name, + &(context->uc), smx_context_usable_stack_size); + return (smx_context_t) context; } -void smx_ctx_sysv_free(smx_context_t context) +static void smx_ctx_sysv_free(smx_context_t context) { if (context) { - -#ifdef HAVE_VALGRIND_VALGRIND_H - VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) - context)->valgrind_stack_id); -#endif /* HAVE_VALGRIND_VALGRIND_H */ - + SIMIX_context_stack_delete(((smx_ctx_sysv_t)context)->stack); } smx_ctx_base_free(context); } -void smx_ctx_sysv_stop(smx_context_t context) +static void smx_ctx_sysv_wrapper(int first, ...) +{ + int ctx_addr[CTX_ADDR_LEN]; + smx_ctx_sysv_t context; + + ctx_addr[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[i] = va_arg(ap, int); + va_end(ap); + } + memcpy(&context, ctx_addr, sizeof(smx_ctx_sysv_t)); + (context->super.code) (context->super.argc, context->super.argv); + + simix_global->context_factory->stop((smx_context_t) context); +} + +static void smx_ctx_sysv_stop_serial(smx_context_t context) { smx_ctx_base_stop(context); - - smx_ctx_sysv_suspend(context); + smx_ctx_sysv_suspend_serial(context); } -void smx_ctx_sysv_wrapper(smx_ctx_sysv_t context) -{ - (context->super.code) (context->super.argc, context->super.argv); +static void smx_ctx_sysv_suspend_serial(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); +} - smx_ctx_sysv_stop((smx_context_t) context); +static void smx_ctx_sysv_resume_serial(smx_process_t first_process) +{ + smx_context_t context = first_process->context; + SIMIX_context_set_current(context); + swapcontext(&sysv_maestro_context->uc, + &((smx_ctx_sysv_t) context)->uc); } -void smx_ctx_sysv_suspend(smx_context_t context) +static void smx_ctx_sysv_runall_serial(void) { - ucontext_t maestro_ctx = - ((smx_ctx_sysv_t) simix_global->maestro_process->context)->uc; + smx_process_t first_process = + xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t); + sysv_process_index = 1; - int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx); + /* 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); } -void smx_ctx_sysv_resume(smx_context_t new_context) +static void smx_ctx_sysv_suspend_parallel(smx_context_t context) { - smx_ctx_sysv_t maestro = - (smx_ctx_sysv_t) simix_global->maestro_process->context; +#ifdef CONTEXT_THREADS + /* determine the next context */ + smx_process_t next_work = xbt_parmap_next(sysv_parmap); // get the next soul to embody now + smx_context_t next_context; + ucontext_t* next_stack; // will contain the next soul to run, either simulated or initial minion's one + + if (next_work != NULL) { // there is a next soul to embody (ie, a next process to resume) + XBT_DEBUG("Run next process"); + next_context = next_work->context; + } + else { + /* all processes were run, go to the barrier */ + XBT_DEBUG("No more processes to run"); + unsigned long worker_id = // Get back the identity of my body that was stored when starting the scheduling round + (unsigned long) xbt_os_thread_get_specific(sysv_worker_id_key); + next_context = (smx_context_t)sysv_workers_context[worker_id]; // deduce the initial soul of that body + // When given that soul, the body will wait for the next scheduling round + } - int rv = - swapcontext(&(maestro->uc), &((smx_ctx_sysv_t) new_context)->uc); + next_stack = &((smx_ctx_sysv_t)next_context)->uc; - xbt_assert0((rv == 0), "Context swapping failure"); + SIMIX_context_set_current(next_context); + swapcontext(&((smx_ctx_sysv_t) context)->uc, next_stack); // get that next soul +#endif } -void smx_ctx_sysv_runall(xbt_swag_t processes) +static void smx_ctx_sysv_resume_parallel(smx_process_t simulated_process_to_run) { - smx_context_t old_context; - smx_process_t process; - - while ((process = xbt_swag_extract(processes))) { - old_context = smx_current_context; - smx_current_context = process->context; - smx_ctx_sysv_resume(smx_current_context); - smx_current_context = old_context; - } +#ifdef CONTEXT_THREADS + unsigned long worker_id = __sync_fetch_and_add(&sysv_threads_working, 1); // what is my containing body? + xbt_os_thread_set_specific(sysv_worker_id_key, (void*) worker_id); // Store the number of my containing body in os-thread-specific area + smx_ctx_sysv_t worker_context = (smx_ctx_sysv_t)SIMIX_context_self(); // get my current soul + sysv_workers_context[worker_id] = worker_context; // write down that this soul is hosted in that body (for now) + ucontext_t* worker_stack = &worker_context->uc; // retrieves the system-level info that fuels this soul + + smx_context_t context = simulated_process_to_run->context; // That's the first soul that I should become + SIMIX_context_set_current(context); // write in simix that I switched my soul + swapcontext(worker_stack, &((smx_ctx_sysv_t) context)->uc); // actually do that using the relevant syscall + // No body runs that soul anymore at this point. Instead the current body took the soul of simulated process + // The simulated process wakes back after the call to "SIMIX_context_suspend(self->context);" within smx_process.c::SIMIX_process_yield() + + // From now on, the simulated processes will change their soul with the next soul to execute (in suspend_parallel, above). + // When nobody is to be executed in this scheduling round, the last simulated process will take back the initial soul of the current working thread +#endif } -void smx_ctx_sysv_runall_parallel(xbt_swag_t processes) +static void smx_ctx_sysv_runall_parallel(void) { - smx_process_t process; - while((process = xbt_swag_extract(processes))){ - xbt_tpool_queue_job(tpool, (void_f_pvoid_t)smx_ctx_sysv_resume, process->context); - } -} \ No newline at end of file +#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 +}