+++ /dev/null
-/* Copyright (c) 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. */
-
-/** @file smx_context_boost.cpp Userspace context switching implementation based on Boost.Context */
-
-#include <cstdint>
-
-#include <boost/context/all.hpp>
-
-#include "xbt/log.h"
-#include "smx_private.h"
-#include "src/internal_config.h"
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-
-typedef struct s_smx_ctx_boost {
- s_smx_ctx_base_t super; /* Fields of super implementation */
-#if HAVE_BOOST_CONTEXT == 1
- boost::context::fcontext_t* fc;
-#else
- boost::context::fcontext_t fc;
-#endif
- void* stack;
-} s_smx_ctx_boost_t, *smx_ctx_boost_t;
-
-static int smx_ctx_boost_factory_finalize(smx_context_factory_t *factory);
-static smx_context_t
-smx_ctx_boost_create_context(xbt_main_func_t code, int argc, char **argv,
- void_pfn_smxprocess_t cleanup_func, smx_process_t process);
-static void smx_ctx_boost_free(smx_context_t context);
-
-static void smx_ctx_boost_wrapper(std::intptr_t arg);
-
-static void smx_ctx_boost_stop_serial(smx_context_t context);
-static void smx_ctx_boost_suspend_serial(smx_context_t context);
-static void smx_ctx_boost_resume_serial(smx_process_t first_process);
-static void smx_ctx_boost_runall_serial(void);
-
-#ifdef CONTEXT_THREADS
-static void smx_ctx_boost_stop_parallel(smx_context_t context);
-static void smx_ctx_boost_suspend_parallel(smx_context_t context);
-static void smx_ctx_boost_resume_parallel(smx_process_t first_process);
-static void smx_ctx_boost_runall_parallel(void);
-#endif
-
-#ifdef CONTEXT_THREADS
-static xbt_parmap_t boost_parmap;
-static smx_ctx_boost_t* boost_workers_context;
-static unsigned long boost_threads_working;
-static xbt_os_thread_key_t boost_worker_id_key;
-#endif
-
-static unsigned long boost_process_index = 0;
-static smx_ctx_boost_t boost_maestro_context;
-
-void SIMIX_ctx_boost_factory_init(smx_context_factory_t *factory)
-{
- smx_ctx_base_factory_init(factory);
- XBT_VERB("Activating boost context factory");
-
- (*factory)->finalize = smx_ctx_boost_factory_finalize;
- (*factory)->create_context = smx_ctx_boost_create_context;
- /* Do not overload that method (*factory)->finalize */
- (*factory)->free = smx_ctx_boost_free;
- (*factory)->name = "smx_boost_context_factory";
-
- if (SIMIX_context_is_parallel()) {
-#ifndef CONTEXT_THREADS
- THROWF(arg_error, 0, "No thread support for parallel context execution");
-#else
- int nthreads = SIMIX_context_get_nthreads();
- boost_parmap = xbt_parmap_new(nthreads, SIMIX_context_get_parallel_mode());
- boost_workers_context = xbt_new(smx_ctx_boost_t, nthreads);
- boost_maestro_context = NULL;
-
- xbt_os_thread_key_create(&boost_worker_id_key);
-
- (*factory)->stop = smx_ctx_boost_stop_parallel;
- (*factory)->suspend = smx_ctx_boost_suspend_parallel;
- (*factory)->runall = smx_ctx_boost_runall_parallel;
-#endif
- } else {
- (*factory)->stop = smx_ctx_boost_stop_serial;
- (*factory)->suspend = smx_ctx_boost_suspend_serial;
- (*factory)->runall = smx_ctx_boost_runall_serial;
- }
-}
-
-/* Initialization functions */
-
-static int smx_ctx_boost_factory_finalize(smx_context_factory_t *factory)
-{
-#ifdef CONTEXT_THREADS
- if (boost_parmap) {
- xbt_parmap_destroy(boost_parmap);
- boost_parmap = nullptr;
- }
- xbt_free(boost_workers_context);
- boost_workers_context = nullptr;
-#endif
- return smx_ctx_base_factory_finalize(factory);
-}
-
-static smx_context_t
-smx_ctx_boost_create_context(xbt_main_func_t code, int argc, char **argv,
- void_pfn_smxprocess_t cleanup_func, smx_process_t process)
-{
- smx_ctx_boost_t context =
- (smx_ctx_boost_t) smx_ctx_base_factory_create_context_sized(
- sizeof(s_smx_ctx_boost_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) {
- context->stack = SIMIX_context_stack_new();
- // We need to pass the bottom of the stack to make_fcontext,
- // depending on the stack direction it may be the lower or higher address:
-#if PTH_STACKGROWTH == -1
- void* stack = (char*) context->stack + smx_context_usable_stack_size - 1;
-#else
- void* stack = context->stack;
-#endif
- context->fc = boost::context::make_fcontext(
- stack,
- smx_context_usable_stack_size,
- smx_ctx_boost_wrapper);
- } else {
- context->stack = nullptr;
-#if HAVE_BOOST_CONTEXT == 1
- context->fc = new boost::context::fcontext_t();
-#endif
- if (boost_maestro_context == nullptr)
- boost_maestro_context = context;
- }
-
- return (smx_context_t) context;
-}
-
-static void smx_ctx_boost_free(smx_context_t c)
-{
- smx_ctx_boost_t context = (smx_ctx_boost_t) c;
- if (!context)
- return;
-#if HAVE_BOOST_CONTEXT == 1
- if (!context->stack)
- delete context->fc;
-#endif
- if ((smx_ctx_boost_t) c == boost_maestro_context)
- boost_maestro_context = nullptr;
- SIMIX_context_stack_delete(context->stack);
- smx_ctx_base_free(c);
-}
-
-static void smx_ctx_boost_wrapper(std::intptr_t arg)
-{
- smx_context_t context = (smx_context_t) arg;
- context->code(context->argc, context->argv);
- smx_ctx_boost_stop_serial(context);
-}
-
-static void smx_ctx_boost_stop_serial(smx_context_t context)
-{
- smx_ctx_base_stop(context);
- simix_global->context_factory->suspend(context);
-}
-
-static void smx_ctx_boost_suspend_serial(smx_context_t context)
-{
- /* determine the next context */
- smx_ctx_boost_t next_context;
- unsigned long int i = boost_process_index++;
-
- if (i < xbt_dynar_length(simix_global->process_to_run)) {
- /* execute the next process */
- XBT_DEBUG("Run next process");
- next_context = (smx_ctx_boost_t) 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_ctx_boost_t) boost_maestro_context;
- }
- SIMIX_context_set_current((smx_context_t) next_context);
-#if HAVE_BOOST_CONTEXT == 1
- boost::context::jump_fcontext(
- ((smx_ctx_boost_t)context)->fc, next_context->fc, (intptr_t)next_context);
-#else
- boost::context::jump_fcontext(
- &((smx_ctx_boost_t)context)->fc, next_context->fc, (intptr_t)next_context);
-#endif
-}
-
-static void smx_ctx_boost_resume_serial(smx_process_t first_process)
-{
- smx_ctx_boost_t context = (smx_ctx_boost_t) first_process->context;
- SIMIX_context_set_current((smx_context_t) context);
-#if HAVE_BOOST_CONTEXT == 1
- boost::context::jump_fcontext(boost_maestro_context->fc, context->fc,
- (intptr_t)context);
-#else
- boost::context::jump_fcontext(&boost_maestro_context->fc, context->fc,
- (intptr_t)context);
-#endif
-}
-
-static void smx_ctx_boost_runall_serial(void)
-{
- smx_process_t first_process =
- xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
- boost_process_index = 1;
-
- /* execute the first process */
- smx_ctx_boost_resume_serial(first_process);
-}
-
-// **** Parallel code
-
-#ifdef CONTEXT_THREADS
-
-static void smx_ctx_boost_stop_parallel(smx_context_t context)
-{
- smx_ctx_base_stop(context);
- smx_ctx_boost_suspend_parallel(context);
-}
-
-static void smx_ctx_boost_suspend_parallel(smx_context_t context)
-{
- smx_process_t next_work = (smx_process_t) xbt_parmap_next(boost_parmap);
- smx_ctx_boost_t next_context;
-
- if (next_work != NULL) {
- XBT_DEBUG("Run next process");
- next_context = (smx_ctx_boost_t) next_work->context;
- }
- else {
- XBT_DEBUG("No more processes to run");
- unsigned long worker_id =
- (unsigned long) xbt_os_thread_get_specific(boost_worker_id_key);
- next_context = boost_workers_context[worker_id];
- }
-
- SIMIX_context_set_current((smx_context_t) next_context);
-#if HAVE_BOOST_CONTEXT == 1
- boost::context::jump_fcontext(
- ((smx_ctx_boost_t)context)->fc, next_context->fc, (intptr_t)next_context);
-#else
- boost::context::jump_fcontext(
- &((smx_ctx_boost_t)context)->fc, next_context->fc, (intptr_t)next_context);
-#endif
-}
-
-static void smx_ctx_boost_resume_parallel(smx_process_t process)
-{
- unsigned long worker_id = __sync_fetch_and_add(&boost_threads_working, 1);
- xbt_os_thread_set_specific(boost_worker_id_key, (void*) worker_id);
-
- smx_ctx_boost_t worker_context = (smx_ctx_boost_t)SIMIX_context_self();
- boost_workers_context[worker_id] = worker_context;
- smx_ctx_boost_t context = (smx_ctx_boost_t) process->context;
-
- SIMIX_context_set_current((smx_context_t) context);
-#if HAVE_BOOST_CONTEXT == 1
- boost::context::jump_fcontext(worker_context->fc, context->fc,
- (intptr_t)context);
-#else
- boost::context::jump_fcontext(&worker_context->fc, context->fc,
- (intptr_t)context);
-#endif
-}
-
-static void smx_ctx_boost_runall_parallel(void)
-{
- boost_threads_working = 0;
- xbt_parmap_apply(boost_parmap, (void_f_pvoid_t) smx_ctx_boost_resume_parallel,
- simix_global->process_to_run);
-}
-
-#endif
