-/* context_thread - implementation of context switching with native threads */
-
-/* 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 "xbt/function_types.h"
-#include "smx_private.h"
-#include "src/portable.h" /* loads context system definitions */
-#include "xbt/swag.h"
-#include "xbt/xbt_os_thread.h"
-#include "src/xbt_modinter.h" /* prototype of os thread module's init/exit in XBT */
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-
-typedef struct s_smx_ctx_thread {
- s_smx_ctx_base_t super; /* Fields of super implementation */
- xbt_os_thread_t thread; /* a plain dumb thread (portable to posix or windows) */
- xbt_os_sem_t begin; /* this semaphore is used to schedule/yield the process */
- xbt_os_sem_t end; /* this semaphore is used to schedule/unschedule the process */
-} s_smx_ctx_thread_t, *smx_ctx_thread_t;
-
-static xbt_os_sem_t smx_ctx_thread_sem;
-
-static smx_context_t
-smx_ctx_thread_factory_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_thread_free(smx_context_t context);
-static void smx_ctx_thread_stop(smx_context_t context);
-static void smx_ctx_thread_suspend(smx_context_t context);
-static void smx_ctx_thread_runall_serial(void);
-static void smx_ctx_thread_runall_parallel(void);
-static smx_context_t smx_ctx_thread_self(void);
-
-static int smx_ctx_thread_factory_finalize(smx_context_factory_t *factory);
-static void *smx_ctx_thread_wrapper(void *param);
-
-void SIMIX_ctx_thread_factory_init(smx_context_factory_t * factory)
-{
- smx_ctx_base_factory_init(factory);
- XBT_VERB("Activating thread context factory");
-
- (*factory)->finalize = smx_ctx_thread_factory_finalize;
- (*factory)->create_context = smx_ctx_thread_factory_create_context;
- /* Do not overload that method (*factory)->finalize */
- (*factory)->free = smx_ctx_thread_free;
- (*factory)->stop = smx_ctx_thread_stop;
- (*factory)->suspend = smx_ctx_thread_suspend;
-
- if (SIMIX_context_is_parallel())
- (*factory)->runall = smx_ctx_thread_runall_parallel;
- else
- (*factory)->runall = smx_ctx_thread_runall_serial;
-
- (*factory)->self = smx_ctx_thread_self;
- (*factory)->name = "ctx_thread_factory";
-
- if (SIMIX_context_is_parallel()) {
- smx_ctx_thread_sem = xbt_os_sem_init(SIMIX_context_get_nthreads());
- } else {
- smx_ctx_thread_sem = NULL;
- }
-}
-
-static int smx_ctx_thread_factory_finalize(smx_context_factory_t *factory)
-{
- if (smx_ctx_thread_sem) {
- xbt_os_sem_destroy(smx_ctx_thread_sem);
- smx_ctx_thread_sem = NULL;
- }
- return smx_ctx_base_factory_finalize(factory);
-}
-
-static smx_context_t
-smx_ctx_thread_factory_create_context(xbt_main_func_t code, int argc,
- char **argv,
- void_pfn_smxprocess_t cleanup_func,
- smx_process_t process)
-{
- smx_ctx_thread_t context = (smx_ctx_thread_t)
- smx_ctx_base_factory_create_context_sized(sizeof(s_smx_ctx_thread_t),
- code, argc, argv,
- cleanup_func, process);
-
- /* If the user provided a function for the process then use it
- otherwise is the context for maestro */
- if (code) {
- context->begin = xbt_os_sem_init(0);
- context->end = xbt_os_sem_init(0);
- if (smx_context_stack_size_was_set)
- xbt_os_thread_setstacksize(smx_context_stack_size);
- if (smx_context_guard_size_was_set)
- xbt_os_thread_setguardsize(smx_context_guard_size);
-
- /* create and start the process */
- /* NOTE: The first argument to xbt_os_thread_create used to be the process *
- * name, but now the name is stored at SIMIX level, so we pass a null */
- context->thread =
- xbt_os_thread_create(NULL, smx_ctx_thread_wrapper, context, context);
-
-
- /* wait the starting of the newly created process */
- xbt_os_sem_acquire(context->end);
-
- } else {
- xbt_os_thread_set_extra_data(context);
- }
-
- return (smx_context_t) context;
-}
-
-static void smx_ctx_thread_free(smx_context_t pcontext)
-{
- smx_ctx_thread_t context = (smx_ctx_thread_t) pcontext;
-
- /* check if this is the context of maestro (it doesn't have a real thread) */
- if (context->thread) {
- /* wait about the thread terminason */
- xbt_os_thread_join(context->thread, NULL);
-
- /* destroy the synchronisation objects */
- xbt_os_sem_destroy(context->begin);
- xbt_os_sem_destroy(context->end);
- }
-
- smx_ctx_base_free(pcontext);
-}
-
-static void smx_ctx_thread_stop(smx_context_t pcontext)
-{
- smx_ctx_thread_t context = (smx_ctx_thread_t) pcontext;
-
- /* please no debug here: our procdata was already free'd */
- smx_ctx_base_stop(pcontext);
-
- if (smx_ctx_thread_sem) /* parallel run */
- xbt_os_sem_release(smx_ctx_thread_sem);
-
- /* signal to the maestro that it has finished */
- xbt_os_sem_release(((smx_ctx_thread_t) context)->end);
-
- /* exit */
- /* We should provide return value in case other wants it */
- xbt_os_thread_exit(NULL);
-}
-
-static void *smx_ctx_thread_wrapper(void *param)
-{
- smx_ctx_thread_t context = (smx_ctx_thread_t) param;
-#ifndef WIN32
- /* Install alternate signal stack, for SIGSEGV handler. */
- stack_t stack;
- stack.ss_sp = sigsegv_stack;
- stack.ss_size = sizeof sigsegv_stack;
- stack.ss_flags = 0;
- sigaltstack(&stack, NULL);
-#endif
- /* Tell the maestro we are starting, and wait for its green light */
- xbt_os_sem_release(context->end);
- xbt_os_sem_acquire(context->begin);
- if (smx_ctx_thread_sem) /* parallel run */
- xbt_os_sem_acquire(smx_ctx_thread_sem);
-
- (context->super.code) (context->super.argc, context->super.argv);
-
- smx_ctx_thread_stop((smx_context_t) context);
- return NULL;
-}
-
-static void smx_ctx_thread_suspend(smx_context_t context)
-{
- if (smx_ctx_thread_sem) /* parallel run */
- xbt_os_sem_release(smx_ctx_thread_sem);
- xbt_os_sem_release(((smx_ctx_thread_t) context)->end);
- xbt_os_sem_acquire(((smx_ctx_thread_t) context)->begin);
- if (smx_ctx_thread_sem) /* parallel run */
- xbt_os_sem_acquire(smx_ctx_thread_sem);
-}
-
-static void smx_ctx_thread_runall_serial(void)
-{
- smx_process_t process;
- unsigned int cursor;
-
- xbt_dynar_foreach(simix_global->process_to_run, cursor, process) {
- XBT_DEBUG("Handling %p",process);
- xbt_os_sem_release(((smx_ctx_thread_t) process->context)->begin);
- xbt_os_sem_acquire(((smx_ctx_thread_t) process->context)->end);
- }
-}
-
-static void smx_ctx_thread_runall_parallel(void)
-{
- unsigned int index;
- smx_process_t process;
-
- xbt_dynar_foreach(simix_global->process_to_run, index, process)
- xbt_os_sem_release(((smx_ctx_thread_t) process->context)->begin);
-
- xbt_dynar_foreach(simix_global->process_to_run, index, process) {
- xbt_os_sem_acquire(((smx_ctx_thread_t) process->context)->end);
- }
-}
-
-static smx_context_t smx_ctx_thread_self(void)
-{
- return (smx_context_t) xbt_os_thread_get_extra_data();
-}