/* $Id$ */
/* Copyright (c) 2002-2007 Arnaud Legrand. */
/* Copyright (c) 2007 Bruno Donassolo. */
/* 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 "msg/private.h"
#include "xbt/sysdep.h"
#include "xbt/log.h"
/** \defgroup m_task_management Managing functions of Tasks
* \brief This section describes the task structure of MSG
* (#m_task_t) and the functions for managing it.
*/
/** @addtogroup m_task_management
* \htmlonly \endhtmlonly
*
* Since most scheduling algorithms rely on a concept of task
* that can be either computed locally or
* transferred on another processor, it seems to be the
* right level of abstraction for our purposes. A task
* may then be defined by a computing amount, a
* message size and some private data.
*/
/********************************* Task **************************************/
/** \ingroup m_task_management
* \brief Creates a new #m_task_t.
*
* A constructor for #m_task_t taking four arguments and returning the
corresponding object.
* \param name a name for the object. It is for user-level information
and can be NULL.
* \param compute_duration a value of the processing amount (in flop)
needed to process this new task. If 0, then it cannot be executed with
MSG_task_execute(). This value has to be >=0.
* \param message_size a value of the amount of data (in bytes) needed to
transfer this new task. If 0, then it cannot be transfered with
MSG_task_get() and MSG_task_put(). This value has to be >=0.
* \param data a pointer to any data may want to attach to the new
object. It is for user-level information and can be NULL. It can
be retrieved with the function \ref MSG_task_get_data.
* \see m_task_t
* \return The new corresponding object.
*/
m_task_t MSG_task_create(const char *name, double compute_duration,
double message_size, void *data)
{
m_task_t task = xbt_new(s_m_task_t, 1);
simdata_task_t simdata = xbt_new(s_simdata_task_t, 1);
task->simdata = simdata;
/* Task structure */
task->name = xbt_strdup(name);
task->data = data;
/* Simulator Data */
simdata->computation_amount = compute_duration;
simdata->message_size = message_size;
simdata->rate = -1.0;
simdata->priority = 1.0;
simdata->refcount = 1;
simdata->sender = NULL;
simdata->receiver = NULL;
simdata->cond = SIMIX_cond_init();
simdata->mutex = SIMIX_mutex_init();
simdata->compute = NULL;
simdata->comm = NULL;
simdata->host_list = NULL;
simdata->comp_amount = NULL;
simdata->comm_amount = NULL;
return task;
}
/** \ingroup m_task_management
* \brief Return the user data of a #m_task_t.
*
* This functions checks whether \a task is a valid pointer or not and return
the user data associated to \a task if it is possible.
*/
void *MSG_task_get_data(m_task_t task)
{
xbt_assert0((task != NULL), "Invalid parameter");
return (task->data);
}
/** \ingroup m_task_management
* \brief Return the sender of a #m_task_t.
*
* This functions returns the #m_process_t which sent this task
*/
m_process_t MSG_task_get_sender(m_task_t task)
{
xbt_assert0(task, "Invalid parameters");
return ((simdata_task_t) task->simdata)->sender;
}
/** \ingroup m_task_management
* \brief Return the source of a #m_task_t.
*
* This functions returns the #m_host_t from which this task was sent
*/
m_host_t MSG_task_get_source(m_task_t task)
{
xbt_assert0(task, "Invalid parameters");
return ((simdata_task_t) task->simdata)->source;
}
/** \ingroup m_task_management
* \brief Return the name of a #m_task_t.
*
* This functions returns the name of a #m_task_t as specified on creation
*/
const char *MSG_task_get_name(m_task_t task)
{
xbt_assert0(task, "Invalid parameters");
return task->name;
}
/** \ingroup m_task_management
* \brief Destroy a #m_task_t.
*
* Destructor for #m_task_t. Note that you should free user data, if any, \b
before calling this function.
*/
MSG_error_t MSG_task_destroy(m_task_t task)
{
smx_action_t action = NULL;
xbt_assert0((task != NULL), "Invalid parameter");
/* why? if somebody is using, then you can't free! ok... but will return MSG_OK? when this task will be destroyed? isn't the user code wrong? */
task->simdata->refcount --;
if (task->simdata->refcount > 0)
return MSG_OK;
if (task->name)
free(task->name);
SIMIX_cond_destroy(task->simdata->cond);
SIMIX_mutex_destroy(task->simdata->mutex);
action = task->simdata->compute;
if (action)
SIMIX_action_destroy(action);
action = task->simdata->comm;
if (action)
SIMIX_action_destroy(action);
/* parallel tasks only */
if (task->simdata->host_list)
xbt_free(task->simdata->host_list);
/* free main structures */
xbt_free(task->simdata);
xbt_free(task);
return MSG_OK;
}
/** \ingroup m_task_management
* \brief Cancel a #m_task_t.
* \param task the taskt to cancel. If it was executed or transfered, it
stops the process that were working on it.
*/
MSG_error_t MSG_task_cancel(m_task_t task)
{
xbt_assert0((task != NULL), "Invalid parameter");
if (task->simdata->compute) {
SIMIX_action_cancel(task->simdata->compute);
return MSG_OK;
}
if (task->simdata->comm) {
SIMIX_action_cancel(task->simdata->comm);
return MSG_OK;
}
return MSG_FATAL;
}
/** \ingroup m_task_management
* \brief Returns the computation amount needed to process a task #m_task_t.
* Once a task has been processed, this amount is thus set to 0...
*/
double MSG_task_get_compute_duration(m_task_t task)
{
xbt_assert0((task != NULL)
&& (task->simdata != NULL), "Invalid parameter");
return task->simdata->computation_amount;
}
/** \ingroup m_task_management
* \brief Returns the remaining computation amount of a task #m_task_t.
*
*/
double MSG_task_get_remaining_computation(m_task_t task)
{
xbt_assert0((task != NULL)
&& (task->simdata != NULL), "Invalid parameter");
if (task->simdata->compute) {
return SIMIX_action_get_remains(task->simdata->compute);
} else {
return task->simdata->computation_amount;
}
}
/** \ingroup m_task_management
* \brief Returns the total amount received by a task #m_task_t.
*
*/
double MSG_task_get_remaining_communication(m_task_t task)
{
xbt_assert0((task != NULL)
&& (task->simdata != NULL), "Invalid parameter");
return SIMIX_action_get_remains(task->simdata->comm);
}
/** \ingroup m_task_management
* \brief Returns the size of the data attached to a task #m_task_t.
*
*/
double MSG_task_get_data_size(m_task_t task)
{
xbt_assert0((task != NULL)
&& (task->simdata != NULL), "Invalid parameter");
return task->simdata->message_size;
}
/** \ingroup m_task_management
* \brief Changes the priority of a computation task. This priority doesn't affect
* the transfer rate. A priority of 2 will make a task receive two times more
* cpu power than the other ones.
*
*/
void MSG_task_set_priority(m_task_t task, double priority)
{
xbt_assert0((task != NULL)
&& (task->simdata != NULL), "Invalid parameter");
task->simdata->priority = 1 / priority;
if (task->simdata->compute)
SIMIX_action_set_priority(task->simdata->compute,
task->simdata->priority);
}