/* a fast and simple context switching library */
-/* Copyright (c) 2004 Arnaud Legrand. All rights reserved. */
+/* Copyright (c) 2004 Arnaud Legrand. */
+/* Copyright (c) 2004 Martin Quinson. */
+/* 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 "portable.h"
#include "context_private.h"
#include "xbt/error.h"
#include "xbt/dynar.h"
#include "gras_config.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(context, xbt, "Context");
+#ifndef HAVE_UCONTEXT_H
+/* don't want to play with conditional compilation in automake tonight, sorry.
+ include directly the c file from here when needed. */
+# include "context_win32.c"
+#endif
-/************************ GNU LIBC CONTEXTS **************************/
-#if USE_CONTEXT==1
-
-static context_t current_context = NULL;
+static xbt_context_t current_context = NULL;
static xbt_dynar_t context_to_destroy = NULL;
-void context_init(void)
+void xbt_context_init(void)
{
if(!current_context) {
- current_context = xbt_new0(s_context_t,1);
- context_to_destroy = xbt_dynar_new(sizeof(context_t),xbt_free);
+ current_context = xbt_new0(s_xbt_context_t,1);
+ context_to_destroy = xbt_dynar_new(sizeof(xbt_context_t),xbt_free);
}
}
-void context_empty_trash(void)
+void xbt_context_empty_trash(void)
{
xbt_dynar_reset(context_to_destroy);
}
static void *__context_wrapper(void *c)
{
- context_t context = c;
+ xbt_context_t context = c;
int i;
/* msg_global->current_process = process; */
xbt_dynar_push(context_to_destroy, &context);
- context_yield(context);
+ xbt_context_yield(context);
return NULL;
}
-void context_start(context_t context)
+void xbt_context_start(xbt_context_t context)
{
/* TBX_FIFO_insert(msg_global->process, process); */
return;
}
-context_t context_create(context_function_t code,
+xbt_context_t xbt_context_create(xbt_context_function_t code,
int argc, char *argv[])
{
- context_t res = NULL;
+ xbt_context_t res = NULL;
- res = xbt_new0(s_context_t,1);
+ res = xbt_new0(s_xbt_context_t,1);
/* WARNING("Initializing context (%p)",res); */
return res;
}
-static void context_destroy(context_t context)
+static void xbt_context_destroy(xbt_context_t context)
{
xbt_free(context);
return;
}
-void context_yield(context_t context)
+void xbt_context_yield(xbt_context_t context)
{
xbt_assert0(current_context,"You have to call context_init() first.");
xbt_assert0(0,"Context swapping failure");
/* WARNING("I am (%p). Coming back\n",context); */
} else {
- context_t old_context = context->save ;
+ xbt_context_t old_context = context->save ;
/* WARNING("**** Back ! ****"); */
/* WARNING("Setting current_context (%p) to context(%p)->save",current_context,context); */
current_context = context->save ;
return;
}
-#else
-
-/****************************** PTHREADS ***************************/
-/* #if HAVE_LIBPTHREAD==1 */
-#ifdef HAVE_LIBPTHREAD /* Nevermind, let's use pthreads... */
-
-static void *__MSG_process_launcher(void *p)
-{
- m_process_t process = (m_process_t) p;
- sim_data_process_t sim_data = process->simdata;
- context_t context = NULL;
- int i;
- msg_global->current_process = process;
- TBX_FIFO_insert(msg_global->process, process);
-
- TBX_FIFO_insert(msg_global->process_to_run, process);
-/* pthread_mutex_lock(&(sim_data->context->mutex)); */
- __MSG_context_yield(sim_data->context);
-
- (*sim_data->context->code) (sim_data->argc,sim_data->argv);
-
- TBX_FIFO_remove(msg_global->process, process);
- TBX_FIFO_remove(msg_global->process_to_run, process);
-
- /* Free blocked process if any */
-/* pthread_mutex_lock(&(sim_data->context->mutex)); */
-/* pthread_cond_signal(&(sim_data->context->cond)); */
-/* pthread_mutex_unlock(&(sim_data->context->mutex)); */
-
- context = sim_data->context;
-
- for(i=0;i<sim_data->argc; i++)
- if(sim_data->argv[i]) FREE(sim_data->argv[i]);
- if(sim_data->argv) FREE(sim_data->argv);
- if(process->name) FREE(process->name);
- FREE(sim_data);
- FREE(process);
-
- TBX_FIFO_insert(msg_global->context_to_destroy,context);
- __MSG_context_yield(context);
-/* __MSG_context_destroy(&context); */
-
- return NULL;
-}
-
-MSG_error_t __MSG_context_start(m_process_t process)
-{
- sim_data_process_t sim_data = NULL;
-
- sim_data = process->simdata;
-
- pthread_mutex_lock(&(sim_data->context->mutex));
-
- /* Launch the thread */
- if (pthread_create(sim_data->context->thread, NULL, __MSG_process_launcher,
- process) != 0) {
- WARNING("Unable to create a thread.");
- return MSG_FATAL;
- }
- pthread_cond_wait(&(sim_data->context->cond), &(sim_data->context->mutex));
- pthread_mutex_unlock(&(sim_data->context->mutex));
-/* __MSG_context_yield(sim_data->context); */
-
- return MSG_OK;
-}
-
-context_t __MSG_context_create(m_process_code_t code)
-{
- context_t res = NULL;
-
- res = CALLOC(1, sizeof(struct s_context));
-
- res->code = code;
- res->thread = CALLOC(1, sizeof(pthread_t));
- if (pthread_mutex_init(&(res->mutex), NULL) != 0)
- FAILURE("Mutex initialization error");
- if (pthread_cond_init(&(res->cond), NULL) != 0)
- FAILURE("Condition initialization error");
-
- return res;
-}
-
-MSG_error_t __MSG_context_destroy(context_t * context)
-{
- ASSERT(((context != NULL) && (*context != NULL)), "Invalid parameters");
-
- FREE((*context)->thread);
- pthread_mutex_destroy(&((*context)->mutex));
- pthread_cond_destroy(&((*context)->cond));
-
- FREE(*context);
- *context = NULL;
-
- return MSG_OK;
-}
-
-MSG_error_t __MSG_context_yield(context_t context)
-{
- if (context) {
- m_process_t self = msg_global->current_process;
- pthread_mutex_lock(&(context->mutex));
- pthread_cond_signal(&context->cond);
- pthread_cond_wait(&context->cond, &context->mutex);
- pthread_mutex_unlock(&(context->mutex));
- msg_global->current_process = self;
- }
- return MSG_OK;
-}
-#endif /* HAVE_LIBPTHREAD */
-#endif /* USE_CONTEXT */
