+/** \ingroup m_task_management
+ * \brief Creates a new #m_task_t (a parallel one....).
+ *
+ * A constructor for #m_task_t taking six arguments and returning the
+ corresponding object.
+ * \param name a name for the object. It is for user-level information
+ and can be NULL.
+ * \param host_nb the number of hosts implied in the parallel task.
+ * \param host_list an array of \p host_nb m_host_t.
+ * \param computation_amount an array of \p host_nb
+ doubles. computation_amount[i] is the total number of operations
+ that have to be performed on host_list[i].
+ * \param communication_amount an array of \p host_nb* \p host_nb doubles.
+ * \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_parallel_task_create(const char *name,int host_nb, const m_host_t * host_list, double *computation_amount, double *communication_amount, void *data)
+{
+ int i;
+ simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
+ m_task_t task = xbt_new0(s_m_task_t, 1);
+ task->simdata = simdata;
+
+ /* Task structure */
+ task->name = xbt_strdup(name);
+ task->data = data;
+
+ /* Simulator Data */
+ simdata->computation_amount = 0;
+ simdata->message_size = 0;
+ simdata->cond = SIMIX_cond_init();
+ simdata->mutex = SIMIX_mutex_init();
+ simdata->compute = NULL;
+ simdata->comm = NULL;
+ simdata->rate = -1.0;
+ simdata->using = 1;
+ simdata->sender = NULL;
+ simdata->receiver = NULL;
+ simdata->source = NULL;
+
+ simdata->host_nb = host_nb;
+ simdata->host_list = xbt_new0(smx_host_t, host_nb);
+ simdata->comp_amount = computation_amount;
+ simdata->comm_amount = communication_amount;
+
+ for (i = 0; i < host_nb; i++)
+ simdata->host_list[i] = host_list[i]->simdata->smx_host;
+
+ return task;
+}
+
+MSG_error_t
+MSG_parallel_task_execute(m_task_t task)
+{
+ simdata_task_t simdata = NULL;
+ m_process_t self = MSG_process_self();
+ CHECK_HOST();
+
+ simdata = task->simdata;
+
+ xbt_assert0((!simdata->compute) && (task->simdata->using == 1),"This task is executed somewhere else. Go fix your code!");
+
+ xbt_assert0(simdata->host_nb,"This is not a parallel task. Go to hell.");
+
+ DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
+
+ simdata->using++;
+
+ SIMIX_mutex_lock(simdata->mutex);
+ simdata->compute =
+ SIMIX_action_parallel_execute(task->name, simdata->host_nb, simdata->host_list, simdata->comp_amount, simdata->comm_amount, 1.0, -1.0);
+
+ self->simdata->waiting_task = task;
+ SIMIX_register_action_to_condition(simdata->compute, simdata->cond);
+ SIMIX_cond_wait(simdata->cond, simdata->mutex);
+ SIMIX_unregister_action_to_condition(simdata->compute, simdata->cond);
+ self->simdata->waiting_task = NULL;
+
+
+ SIMIX_mutex_unlock(simdata->mutex);
+ simdata->using--;
+
+ if (SIMIX_action_get_state(task->simdata->compute) == SURF_ACTION_DONE)
+ {
+ /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+ SIMIX_action_destroy(task->simdata->compute);
+ simdata->computation_amount = 0.0;
+ simdata->comm = NULL;
+ simdata->compute = NULL;
+ MSG_RETURN(MSG_OK);
+ }
+ else if(SIMIX_host_get_state(SIMIX_host_self()) == 0)
+ {
+ /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+ SIMIX_action_destroy(task->simdata->compute);
+ simdata->comm = NULL;
+ simdata->compute = NULL;
+ MSG_RETURN(MSG_HOST_FAILURE);
+ }
+ else
+ {
+ /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+ SIMIX_action_destroy(task->simdata->compute);
+ simdata->comm = NULL;
+ simdata->compute = NULL;
+ MSG_RETURN(MSG_TASK_CANCELLED);
+ }
+
+}
+
+