X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d62761dc9056a949309e78420f0d077aeb79efaa..ca7162936235b0732afe3a675ca09fe11f915eab:/src/msg/gos.c

diff --git a/src/msg/gos.c b/src/msg/gos.c
index b7a99af3f9..8093c97664 100644
--- a/src/msg/gos.c
+++ b/src/msg/gos.c
@@ -4,8 +4,7 @@
 /* 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 "simix/private.h"
+#include "private.h"
 #include "xbt/sysdep.h"
 #include "mc/mc.h"
 #include "xbt/log.h"
@@ -13,7 +12,7 @@
 
 
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
-		"Logging specific to MSG (gos)");
+                                "Logging specific to MSG (gos)");
 
 /** \ingroup msg_gos_functions
  *
@@ -22,7 +21,7 @@ XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
  */
 MSG_error_t MSG_get_errno(void)
 {
-	return PROCESS_GET_ERRNO();
+  return PROCESS_GET_ERRNO();
 }
 
 /** \ingroup msg_gos_functions
@@ -37,79 +36,74 @@ MSG_error_t MSG_get_errno(void)
  */
 MSG_error_t MSG_task_execute(m_task_t task)
 {
-	simdata_task_t simdata = NULL;
-	m_process_t self = MSG_process_self();
-	e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
-	CHECK_HOST();
+  simdata_task_t simdata = NULL;
+  m_process_t self = MSG_process_self();
+  e_smx_state_t comp_state;
+  CHECK_HOST();
 
-	simdata = task->simdata;
+  simdata = task->simdata;
 
-	xbt_assert0(simdata->host_nb==0, "This is a parallel task. Go to hell.");
+  xbt_assert0(simdata->host_nb == 0,
+              "This is a parallel task. Go to hell.");
 
 #ifdef HAVE_TRACING
-	TRACE_msg_task_execute_start (task);
+  TRACE_msg_task_execute_start(task);
 #endif
 
-	xbt_assert1((!simdata->compute) && (task->simdata->refcount == 1),
-			"This task is executed somewhere else. Go fix your code! %d", task->simdata->refcount);
+  xbt_assert1((!simdata->compute) && (task->simdata->isused == 0),
+              "This task is executed somewhere else. Go fix your code! %d",
+              task->simdata->isused);
 
-	DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
+  DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
 
-	if (simdata->computation_amount == 0) {
+  if (simdata->computation_amount == 0) {
 #ifdef HAVE_TRACING
-		TRACE_msg_task_execute_end (task);
+    TRACE_msg_task_execute_end(task);
 #endif
-		return MSG_OK;
-	}
-	simdata->refcount++;
-	SIMIX_mutex_lock(simdata->mutex);
-	simdata->compute =
-		SIMIX_action_execute(SIMIX_host_self(), task->name,
-				simdata->computation_amount);
-	SIMIX_action_set_priority(simdata->compute, simdata->priority);
-
-	/* changed to waiting action since we are always waiting one action (execute, communicate or sleep) */
-	self->simdata->waiting_action = simdata->compute;
-	SIMIX_register_action_to_condition(simdata->compute, simdata->cond);
-	do {
-		SIMIX_cond_wait(simdata->cond, simdata->mutex);
-		state = SIMIX_action_get_state(simdata->compute);
-	} while (state == SURF_ACTION_READY || state == SURF_ACTION_RUNNING);
-	SIMIX_unregister_action_to_condition(simdata->compute, simdata->cond);
-	self->simdata->waiting_action = NULL;
-
-	SIMIX_mutex_unlock(simdata->mutex);
-	simdata->refcount--;
-
-	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;
+    return MSG_OK;
+  }
+  simdata->isused=1;
+  simdata->compute =
+      SIMIX_req_host_execute(task->name, SIMIX_host_self(),
+                           simdata->computation_amount,
+                           simdata->priority);
 #ifdef HAVE_TRACING
-		TRACE_msg_task_execute_end (task);
+  SIMIX_req_set_category(simdata->compute, task->category);
 #endif
-		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;
+
+  self->simdata->waiting_action = simdata->compute;
+  comp_state = SIMIX_req_host_execution_wait(simdata->compute);
+  self->simdata->waiting_action = NULL;
+
+  simdata->isused=0;
+
+  DEBUG2("Execution task '%s' finished in state %d", task->name, comp_state);
+  if (comp_state == SIMIX_DONE) {
+    /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+    simdata->computation_amount = 0.0;
+    simdata->comm = NULL;
+    simdata->compute = NULL;
+#ifdef HAVE_TRACING
+    TRACE_msg_task_execute_end(task);
+#endif
+    MSG_RETURN(MSG_OK);
+  } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
+    /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+    simdata->comm = NULL;
+    simdata->compute = NULL;
 #ifdef HAVE_TRACING
-		TRACE_msg_task_execute_end (task);
+    TRACE_msg_task_execute_end(task);
 #endif
-		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_HOST_FAILURE);
+  } else {
+    /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+    simdata->comm = NULL;
+    simdata->compute = NULL;
 #ifdef HAVE_TRACING
-		TRACE_msg_task_execute_end (task);
+    TRACE_msg_task_execute_end(task);
 #endif
-		MSG_RETURN(MSG_TASK_CANCELLED);
-	}
+    MSG_RETURN(MSG_TASK_CANCELLED);
+  }
 }
 
 /** \ingroup m_task_management
@@ -131,105 +125,95 @@ MSG_error_t MSG_task_execute(m_task_t task)
  * \see m_task_t
  * \return The new corresponding object.
  */
-	m_task_t
+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->refcount = 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;
+                         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->compute = NULL;
+  simdata->comm = NULL;
+  simdata->rate = -1.0;
+  simdata->isused = 0;
+  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();
-	e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
-	CHECK_HOST();
-
-	simdata = task->simdata;
+  simdata_task_t simdata = NULL;
+  e_smx_state_t comp_state;
+  m_process_t self = MSG_process_self();
+  CHECK_HOST();
 
-	xbt_assert0((!simdata->compute)
-			&& (task->simdata->refcount == 1),
-			"This task is executed somewhere else. Go fix your code!");
+  simdata = task->simdata;
 
-	xbt_assert0(simdata->host_nb, "This is not a parallel task. Go to hell.");
+  xbt_assert0((!simdata->compute)
+              && (task->simdata->isused == 0),
+              "This task is executed somewhere else. Go fix your code!");
 
-	DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
+  xbt_assert0(simdata->host_nb,
+              "This is not a parallel task. Go to hell.");
 
-	simdata->refcount++;
+  DEBUG1("Parallel computing on %s", MSG_process_self()->simdata->m_host->name);
 
-	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);
+  simdata->isused=1;
 
-	self->simdata->waiting_action = simdata->compute;
-	SIMIX_register_action_to_condition(simdata->compute, simdata->cond);
-	do {
-		SIMIX_cond_wait(simdata->cond, simdata->mutex);
-		state = SIMIX_action_get_state(task->simdata->compute);
-	} while (state == SURF_ACTION_READY || state == SURF_ACTION_RUNNING);
+  simdata->compute =
+      SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
+                                  simdata->host_list,
+                                  simdata->comp_amount,
+                                  simdata->comm_amount, 1.0, -1.0);
+  DEBUG1("Parallel execution action created: %p", simdata->compute);
 
-	SIMIX_unregister_action_to_condition(simdata->compute, simdata->cond);
-	self->simdata->waiting_action = NULL;
+  self->simdata->waiting_action = simdata->compute;
+  comp_state = SIMIX_req_host_execution_wait(simdata->compute);
+  self->simdata->waiting_action = NULL;
 
+  DEBUG2("Finished waiting for execution of action %p, state = %d", simdata->compute, comp_state);
 
-	SIMIX_mutex_unlock(simdata->mutex);
-	simdata->refcount--;
-
-	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);
-	}
+  simdata->isused=0;
 
+  if (comp_state == SIMIX_DONE) {
+    /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+    simdata->computation_amount = 0.0;
+    simdata->comm = NULL;
+    simdata->compute = NULL;
+    MSG_RETURN(MSG_OK);
+  } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
+    /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+    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 */
+    simdata->comm = NULL;
+    simdata->compute = NULL;
+    MSG_RETURN(MSG_TASK_CANCELLED);
+  }
 }
 
 
@@ -242,62 +226,33 @@ MSG_error_t MSG_parallel_task_execute(m_task_t task)
  */
 MSG_error_t MSG_process_sleep(double nb_sec)
 {
-	smx_action_t act_sleep;
-	m_process_t proc = MSG_process_self();
-	e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
-	smx_mutex_t mutex;
-	smx_cond_t cond;
+  e_smx_state_t state;
+  /*m_process_t proc = MSG_process_self();*/
 
 #ifdef HAVE_TRACING
-	TRACE_msg_process_sleep_in (MSG_process_self());
+  TRACE_msg_process_sleep_in(MSG_process_self());
 #endif
 
-	/* create action to sleep */
-	act_sleep =
-		SIMIX_action_sleep(SIMIX_process_get_host(proc->simdata->s_process),
-				nb_sec);
-
-	mutex = SIMIX_mutex_init();
-	SIMIX_mutex_lock(mutex);
-
-	/* create conditional and register action to it */
-	cond = SIMIX_cond_init();
-
-	proc->simdata->waiting_action = act_sleep;
-	SIMIX_register_action_to_condition(act_sleep, cond);
-	do {
-		SIMIX_cond_wait(cond, mutex);
-		state = SIMIX_action_get_state(act_sleep);
-	} while (state == SURF_ACTION_READY || state == SURF_ACTION_RUNNING);
-	proc->simdata->waiting_action = NULL;
-	SIMIX_unregister_action_to_condition(act_sleep, cond);
-	SIMIX_mutex_unlock(mutex);
-
-	/* remove variables */
-	SIMIX_cond_destroy(cond);
-	SIMIX_mutex_destroy(mutex);
-
-	if (SIMIX_action_get_state(act_sleep) == SURF_ACTION_DONE) {
-		if (SIMIX_host_get_state(SIMIX_host_self()) == SURF_RESOURCE_OFF) {
-			SIMIX_action_destroy(act_sleep);
-#ifdef HAVE_TRACING
-			TRACE_msg_process_sleep_out (MSG_process_self());
-#endif
-			MSG_RETURN(MSG_HOST_FAILURE);
-		}
-	} else {
-		SIMIX_action_destroy(act_sleep);
+  /* create action to sleep */
+  state = SIMIX_req_process_sleep(nb_sec);
+
+  /*proc->simdata->waiting_action = act_sleep;
+
+  FIXME: check if not setting the waiting_action breaks something on msg
+  
+  proc->simdata->waiting_action = NULL;*/
+  
+  if (state == SIMIX_DONE) {
 #ifdef HAVE_TRACING
-		TRACE_msg_process_sleep_out (MSG_process_self());
+  TRACE_msg_process_sleep_out(MSG_process_self());
 #endif
-		MSG_RETURN(MSG_HOST_FAILURE);
-	}
-
-	SIMIX_action_destroy(act_sleep);
+    MSG_RETURN(MSG_OK);
+  } else {
 #ifdef HAVE_TRACING
-	TRACE_msg_process_sleep_out (MSG_process_self());
+    TRACE_msg_process_sleep_out(MSG_process_self());
 #endif
-	MSG_RETURN(MSG_OK);
+    MSG_RETURN(MSG_HOST_FAILURE);
+  }
 }
 
 /** \ingroup msg_gos_functions
@@ -315,10 +270,10 @@ MSG_error_t MSG_process_sleep(double nb_sec)
  * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
  if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
  */
-	MSG_error_t
+MSG_error_t
 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
 {
-	return MSG_task_get_ext(task, channel, -1, host);
+  return MSG_task_get_ext(task, channel, -1, host);
 }
 
 /** \ingroup msg_gos_functions
@@ -337,7 +292,7 @@ MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
  */
 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
 {
-	return MSG_task_get_with_timeout(task, channel, -1);
+  return MSG_task_get_with_timeout(task, channel, -1);
 }
 
 /** \ingroup msg_gos_functions
@@ -358,11 +313,11 @@ MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
  * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
  if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
  */
-	MSG_error_t
+MSG_error_t
 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
-		double max_duration)
+                          double max_duration)
 {
-	return MSG_task_get_ext(task, channel, max_duration, NULL);
+  return MSG_task_get_ext(task, channel, max_duration, NULL);
 }
 
 /** \defgroup msg_gos_functions MSG Operating System Functions
@@ -370,165 +325,419 @@ MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
  *  by an agent for handling some task.
  */
 
-	MSG_error_t
+MSG_error_t
 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
-		m_host_t host)
+                 m_host_t host)
 {
-	xbt_assert1((channel >= 0)
-			&& (channel < msg_global->max_channel), "Invalid channel %d",
-			channel);
+  xbt_assert1((channel >= 0)
+              && (channel < msg_global->max_channel), "Invalid channel %d",
+              channel);
 
-	return
-		MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
-				(MSG_host_self(), channel), task, host, timeout);
+  return
+      MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
+                               (MSG_host_self(), channel), task, host,
+                               timeout);
 }
 
-	MSG_error_t
-MSG_task_receive_from_host(m_task_t * task, const char *alias, m_host_t host)
+MSG_error_t
+MSG_task_receive_from_host(m_task_t * task, const char *alias,
+                           m_host_t host)
 {
-	return MSG_task_receive_ext(task, alias, -1, host);
+  return MSG_task_receive_ext(task, alias, -1, host);
 }
 
 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
 {
-	return MSG_task_receive_with_timeout(task, alias, -1);
+  return MSG_task_receive_with_timeout(task, alias, -1);
 }
 
-	MSG_error_t
+MSG_error_t
 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
-		double timeout)
+                              double timeout)
 {
-	return MSG_task_receive_ext(task, alias, timeout, NULL);
+  return MSG_task_receive_ext(task, alias, timeout, NULL);
 }
 
-	MSG_error_t
+MSG_error_t
 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
-		m_host_t host)
+                     m_host_t host)
 {
-	return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task, host,
-			timeout);
+  DEBUG1
+      ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
+       alias);
+  return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
+                                  host, timeout);
 }
 
-msg_comm_t MSG_task_isend(m_task_t task, const char *alias) {
-	simdata_task_t t_simdata = NULL;
-	m_process_t process = MSG_process_self();
-	msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
-
-	CHECK_HOST();
+/** \ingroup msg_gos_functions
+ * \brief Sends a task on a mailbox.
+ *
+ * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
+ * to end the communication.
+ *
+ * \param task a #m_task_t to send on another location.
+ * \param alias name of the mailbox to sent the task to
+ * \return the msg_comm_t communication created
+ */
+msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
+{
+  simdata_task_t t_simdata = NULL;
+  m_process_t process = MSG_process_self();
+  msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
 
-	/* FIXME: these functions are not tracable */
+  CHECK_HOST();
 
-	/* Prepare the task to send */
-	t_simdata = task->simdata;
-	t_simdata->sender = process;
-	t_simdata->source = MSG_host_self();
+  /* FIXME: these functions are not traceable */
 
-	xbt_assert0(t_simdata->refcount == 1,
-			"This task is still being used somewhere else. You cannot send it now. Go fix your code!");
+  /* Prepare the task to send */
+  t_simdata = task->simdata;
+  t_simdata->sender = process;
+  t_simdata->source = MSG_host_self();
 
-	t_simdata->refcount++;
-	msg_global->sent_msg++;
-	process->simdata->waiting_task = task;
+  xbt_assert0(t_simdata->isused == 0,
+              "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
 
-	/* Send it by calling SIMIX network layer */
+  t_simdata->isused = 1;
+  msg_global->sent_msg++;
 
-	/* Kept for semantical compatibility with older implementation */
-	if(mailbox->cond)
-		SIMIX_cond_signal(mailbox->cond);
+  /* Send it by calling SIMIX network layer */
+  msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
+  comm->task_sent = task;
+  comm->task_received = NULL;
+  comm->status = MSG_OK;
+  comm->s_comm =
+    SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
+                         t_simdata->rate, task, sizeof(void *), NULL, NULL, 0);
+  t_simdata->comm = comm->s_comm; /* FIXME: is the field t_simdata->comm still useful? */
 
-	return SIMIX_network_isend(mailbox->rdv, t_simdata->message_size, t_simdata->rate,
-			task, sizeof(void*), &t_simdata->comm);
+  return comm;
 }
 
-msg_comm_t MSG_task_irecv(m_task_t * task, const char *alias) {
-	smx_comm_t comm;
-	smx_rdv_t rdv = MSG_mailbox_get_by_alias(alias)->rdv;
-	msg_mailbox_t mailbox=MSG_mailbox_get_by_alias(alias);
-	size_t size = sizeof(void*);
+/** \ingroup msg_gos_functions
+ * \brief Sends a task on a mailbox.
+ *
+ * This is a non blocking detached send function.
+ * Think of it as a best effort send. The communication
+ * object will be destroyed by the receiver (if any).
+ *
+ * \param task a #m_task_t to send on another location.
+ * \param alias name of the mailbox to sent the task to
+ * \param cleanup a function to destroy the task if the
+ * communication fails (if NULL, MSG_task_destroy() will
+ * be used by default)
+ */
+void MSG_task_dsend(m_task_t task, const char *alias, void_f_pvoid_t cleanup)
+{
+  simdata_task_t t_simdata = NULL;
+  m_process_t process = MSG_process_self();
+  msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
 
-	CHECK_HOST();
+  CHECK_HOST();
 
-	/* FIXME: these functions are not tracable */
+  if (cleanup == NULL) {
+    cleanup = (void_f_pvoid_t) MSG_task_destroy;
+  }
 
-	memset(&comm,0,sizeof(comm));
+  /* FIXME: these functions are not traceable */
 
-	/* Kept for compatibility with older implementation */
-	xbt_assert1(!MSG_mailbox_get_cond(mailbox),
-			"A process is already blocked on this channel %s",
-			MSG_mailbox_get_alias(mailbox));
+  /* Prepare the task to send */
+  t_simdata = task->simdata;
+  t_simdata->sender = process;
+  t_simdata->source = MSG_host_self();
 
-	/* Sanity check */
-	xbt_assert0(task, "Null pointer for the task storage");
+  xbt_assert0(t_simdata->isused == 0,
+              "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
 
-	if (*task)
-		CRITICAL0("MSG_task_get() was asked to write in a non empty task struct.");
+  t_simdata->isused = 1;
+  msg_global->sent_msg++;
 
-	/* Try to receive it by calling SIMIX network layer */
-	return SIMIX_network_irecv(rdv, task, &size);
+  /* Send it by calling SIMIX network layer */
+  SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
+                       t_simdata->rate, task, sizeof(void *), NULL, cleanup, 1);
 }
-int MSG_comm_test(msg_comm_t comm) {
-	return SIMIX_network_test(comm);
+
+/** \ingroup msg_gos_functions
+ * \brief Starts listening for receiving a task from an asynchronous communication.
+ *
+ * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
+ * to end the communication.
+ *
+ * \param task a memory location for storing a #m_task_t.
+ * \param name of the mailbox to receive the task on
+ * \return the msg_comm_t communication created
+ */
+msg_comm_t MSG_task_irecv(m_task_t *task, const char *alias)
+{
+  smx_rdv_t rdv = MSG_mailbox_get_by_alias(alias);
+
+  CHECK_HOST();
+
+  /* FIXME: these functions are not tracable */
+
+  /* Sanity check */
+  xbt_assert0(task, "Null pointer for the task storage");
+
+  if (*task)
+    CRITICAL0
+        ("MSG_task_get() was asked to write in a non empty task struct.");
+
+  /* Try to receive it by calling SIMIX network layer */
+  msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
+  comm->task_sent = NULL;
+  comm->task_received = task;
+  comm->status = MSG_OK;
+  comm->s_comm = SIMIX_req_comm_irecv(rdv, task, NULL, NULL, NULL);
+
+  return comm;
 }
 
-/* After received TRUE to MSG_comm_test() function we have to destroy the communication */
-void MSG_comm_destroy(msg_comm_t comm) {
-	if(!(comm->src_proc == SIMIX_process_self()))
-	{
-		m_task_t  task;
-		task = (m_task_t) SIMIX_communication_get_src_buf(comm);
-		task->simdata->refcount--;
-	}
-	SIMIX_communication_destroy(comm);
+/** \ingroup msg_gos_functions
+ * \brief Checks whether a communication is done, and if yes, finalizes it.
+ * \param comm the communication to test
+ * \return TRUE if the communication is finished
+ * (but it may have failed, use MSG_comm_get_status() to know its status)
+ * or FALSE if the communication is not finished yet
+ * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
+ */
+int MSG_comm_test(msg_comm_t comm)
+{
+  xbt_ex_t e;
+  int finished = 0;
+  TRY {
+    finished = SIMIX_req_comm_test(comm->s_comm);
+  }
+  CATCH(e) {
+    switch (e.category) {
+
+      case host_error:
+        comm->status = MSG_HOST_FAILURE;
+        finished = 1;
+        break;
+
+      case network_error:
+        comm->status = MSG_TRANSFER_FAILURE;
+        finished = 1;
+        break;
+
+      case timeout_error:
+        comm->status = MSG_TIMEOUT;
+        finished = 1;
+        break;
+
+      default:
+        RETHROW;
+    }
+    xbt_ex_free(e);
+  }
+
+  return finished;
 }
 
-MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout) {
-	xbt_ex_t e;
-	MSG_error_t res = MSG_OK;
-	TRY {
-		SIMIX_network_wait(comm,timeout);
+/** \ingroup msg_gos_functions
+ * \brief This function checks if a communication is finished.
+ * \param comms a vector of communications
+ * \return the position of the finished communication if any
+ * (but it may have failed, use MSG_comm_get_status() to know its status),
+ * or -1 if none is finished
+ */
+int MSG_comm_testany(xbt_dynar_t comms)
+{
+  xbt_ex_t e;
+  int finished_index = -1;
+
+  /* create the equivalent dynar with SIMIX objects */
+  xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
+  msg_comm_t comm;
+  unsigned int cursor;
+  xbt_dynar_foreach(comms, cursor, comm) {
+    xbt_dynar_push(s_comms, &comm->s_comm);
+  }
+
+  MSG_error_t status = MSG_OK;
+  TRY {
+    finished_index = SIMIX_req_comm_testany(s_comms);
+  }
+  CATCH(e) {
+    switch (e.category) {
+
+      case host_error:
+        finished_index = e.value;
+        status = MSG_HOST_FAILURE;
+        break;
+
+      case network_error:
+        finished_index = e.value;
+        status = MSG_TRANSFER_FAILURE;
+        break;
+
+      case timeout_error:
+        finished_index = e.value;
+        status = MSG_TIMEOUT;
+        break;
+
+      default:
+        RETHROW;
+    }
+    xbt_ex_free(e);
+  }
+  xbt_dynar_free(&s_comms);
+
+  if (finished_index != -1) {
+    comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
+    /* the communication is finished */
+    comm->status = status;
+  }
+
+  return finished_index;
+}
 
-		if(!(comm->src_proc == SIMIX_process_self()))
-		{
-			m_task_t  task;
-			task = (m_task_t) SIMIX_communication_get_src_buf(comm);
-			task->simdata->refcount--;
-		}
+/** \ingroup msg_gos_functions
+ * \brief Destroys a communication.
+ * \param comm the communication to destroy.
+ */
+void MSG_comm_destroy(msg_comm_t comm)
+{
+  if (comm->task_received != NULL
+      && *comm->task_received != NULL
+      && MSG_comm_get_status(comm) == MSG_OK) {
+    (*comm->task_received)->simdata->isused = 0;
+  }
 
-		/* FIXME: these functions are not tracable */
-	}  CATCH(e){
-		switch(e.category){
-			case host_error:
-				res = MSG_HOST_FAILURE;
-				break;
-			case network_error:
-				res = MSG_TRANSFER_FAILURE;
-				break;
-			case timeout_error:
-				res = MSG_TIMEOUT;
-				break;
-			default:
-				xbt_die(bprintf("Unhandled SIMIX network exception: %s",e.msg));
-		}
-		xbt_ex_free(e);
-	}
-	return res;
+  /* FIXME auto-destroy comms from SIMIX to avoid this request */
+  SIMIX_req_comm_destroy(comm->s_comm);
+  free(comm);
 }
 
-
-/* This function is called by a sender and permit to wait for each communication
+/** \ingroup msg_gos_functions
+ * \brief Wait for the completion of a communication.
  *
- * Param:
- * - msg_comm_t *comm a vector of communication
- * - int nb_elem is th esize of the comm vector
- * - timeout for each call of  MSG_comm_wait
+ * It takes two parameters.
+ * \param comm the communication to wait.
+ * \param timeout Wait until the communication terminates or the timeout occurs
+ * \return MSG_error_t
+ */
+MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
+{
+  xbt_ex_t e;
+  TRY {
+    SIMIX_req_comm_wait(comm->s_comm, timeout);
+
+    if (comm->task_received != NULL) {
+      /* I am the receiver */
+      (*comm->task_received)->simdata->isused = 0;
+    }
+
+    /* FIXME: these functions are not traceable */
+  }
+  CATCH(e) {
+    switch (e.category) {
+    case host_error:
+      comm->status = MSG_HOST_FAILURE;
+      break;
+    case network_error:
+      comm->status = MSG_TRANSFER_FAILURE;
+      break;
+    case timeout_error:
+      comm->status = MSG_TIMEOUT;
+      break;
+    default:
+      RETHROW;
+    }
+    xbt_ex_free(e);
+  }
+
+  return comm->status;
+}
+
+/** \ingroup msg_gos_functions
+* \brief This function is called by a sender and permit to wait for each communication
+*
+* \param comm a vector of communication
+* \param nb_elem is the size of the comm vector
+* \param timeout for each call of MSG_comm_wait
+*/
+void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
+{
+  int i = 0;
+  for (i = 0; i < nb_elem; i++) {
+    MSG_comm_wait(comm[i], timeout);
+  }
+}
+
+/** \ingroup msg_gos_functions
+ * \brief This function waits for the first communication finished in a list.
+ * \param comms a vector of communications
+ * \return the position of the first finished communication
+ * (but it may have failed, use MSG_comm_get_status() to know its status)
+ */
+int MSG_comm_waitany(xbt_dynar_t comms)
+{
+  xbt_ex_t e;
+  int finished_index = -1;
+
+  /* create the equivalent dynar with SIMIX objects */
+  xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
+  msg_comm_t comm;
+  unsigned int cursor;
+  xbt_dynar_foreach(comms, cursor, comm) {
+    xbt_dynar_push(s_comms, &comm->s_comm);
+  }
+
+  MSG_error_t status = MSG_OK;
+  TRY {
+    finished_index = SIMIX_req_comm_waitany(s_comms);
+  }
+  CATCH(e) {
+    switch (e.category) {
+
+      case host_error:
+        finished_index = e.value;
+        status = MSG_HOST_FAILURE;
+        break;
+
+      case network_error:
+        finished_index = e.value;
+        status = MSG_TRANSFER_FAILURE;
+        break;
+
+      case timeout_error:
+        finished_index = e.value;
+        status = MSG_TIMEOUT;
+        break;
+
+      default:
+        RETHROW;
+    }
+    xbt_ex_free(e);
+  }
+
+  xbt_assert0(finished_index != -1, "WaitAny returned -1");
+  xbt_dynar_free(&s_comms);
+
+  comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
+  /* the communication is finished */
+  comm->status = status;
+
+  return finished_index;
+}
+
+/**
+ * \ingroup msg_gos_functions
+ * \brief Returns the error (if any) that occured during a finished communication.
+ * \param comm a finished communication
+ * \return the status of the communication, or MSG_OK if no error occured
+ * during the communication
  */
+MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
 
-void MSG_comm_waitall(msg_comm_t *comm,int nb_elem, double timeout) {
-	int i=0;
-	for(i=0; i<nb_elem; i++)
-	{
-		MSG_comm_wait(comm[i],timeout);
-	}
+  return comm->status;
+}
+
+m_task_t MSG_comm_get_task(msg_comm_t comm)
+{
+  xbt_assert0(comm, "Invalid parameter");
+
+  return comm->task_received ? *comm->task_received : comm->task_sent;
 }
 
 /** \ingroup msg_gos_functions
@@ -559,7 +768,7 @@ void MSG_comm_waitall(msg_comm_t *comm,int nb_elem, double timeout) {
  */
 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
 {
-	return MSG_task_put_with_timeout(task, dest, channel, -1.0);
+  return MSG_task_put_with_timeout(task, dest, channel, -1.0);
 }
 
 /** \ingroup msg_gos_functions
@@ -568,12 +777,12 @@ MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
  *
  * \sa MSG_task_put
  */
-	MSG_error_t
+MSG_error_t
 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
-		double maxrate)
+                     double maxrate)
 {
-	task->simdata->rate = maxrate;
-	return MSG_task_put(task, dest, channel);
+  task->simdata->rate = maxrate;
+  return MSG_task_put(task, dest, channel);
 }
 
 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
@@ -605,45 +814,48 @@ this function was called was shut down. Returns
 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
 (network failure, dest failure, timeout...)
  */
-	MSG_error_t
-MSG_task_put_with_timeout(m_task_t task, m_host_t dest, m_channel_t channel,
-		double timeout)
+MSG_error_t
+MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
+                          m_channel_t channel, double timeout)
 {
-	xbt_assert1((channel >= 0)
-			&& (channel < msg_global->max_channel), "Invalid channel %d",
-			channel);
+  xbt_assert1((channel >= 0)
+              && (channel < msg_global->max_channel), "Invalid channel %d",
+              channel);
 
-	return
-		MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel(dest, channel),
-				task, timeout);
+  DEBUG1("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
+  return
+      MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
+                                   (dest, channel), task, timeout);
 }
 
 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
 {
-	return MSG_task_send_with_timeout(task, alias, -1);
+  DEBUG1("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
+  return MSG_task_send_with_timeout(task, alias, -1);
 }
 
 
-	MSG_error_t
+MSG_error_t
 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
 {
-	task->simdata->rate = maxrate;
-	return MSG_task_send(task, alias);
+  task->simdata->rate = maxrate;
+  return MSG_task_send(task, alias);
 }
 
 
-	MSG_error_t
-MSG_task_send_with_timeout(m_task_t task, const char *alias, double timeout)
+MSG_error_t
+MSG_task_send_with_timeout(m_task_t task, const char *alias,
+                           double timeout)
 {
-	return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias), task,
-			timeout);
+  return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
+                                      task, timeout);
 }
 
 int MSG_task_listen(const char *alias)
 {
-	CHECK_HOST();
+  CHECK_HOST();
 
-	return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
+  return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
 }
 
 /** \ingroup msg_gos_functions
@@ -657,15 +869,15 @@ int MSG_task_listen(const char *alias)
  */
 int MSG_task_Iprobe(m_channel_t channel)
 {
-	xbt_assert1((channel >= 0)
-			&& (channel < msg_global->max_channel), "Invalid channel %d",
-			channel);
+  xbt_assert1((channel >= 0)
+              && (channel < msg_global->max_channel), "Invalid channel %d",
+              channel);
 
-	CHECK_HOST();
+  CHECK_HOST();
 
-	return
-		!MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
-				(MSG_host_self(), channel));
+  return
+      !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
+                            (MSG_host_self(), channel));
 }
 
 /** \ingroup msg_gos_functions
@@ -683,26 +895,26 @@ int MSG_task_Iprobe(m_channel_t channel)
  */
 int MSG_task_probe_from_host(int channel, m_host_t host)
 {
-	xbt_assert1((channel >= 0)
-			&& (channel < msg_global->max_channel), "Invalid channel %d",
-			channel);
+  xbt_assert1((channel >= 0)
+              && (channel < msg_global->max_channel), "Invalid channel %d",
+              channel);
 
-	CHECK_HOST();
+  CHECK_HOST();
 
-	return
-		MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
-				(MSG_host_self(), channel),
-				host);
+  return
+      MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
+                                               (MSG_host_self(), channel),
+                                               host);
 
 }
 
 int MSG_task_listen_from_host(const char *alias, m_host_t host)
 {
-	CHECK_HOST();
+  CHECK_HOST();
 
-	return
-		MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias(alias),
-				host);
+  return
+      MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
+                                               (alias), host);
 }
 
 /** \ingroup msg_gos_functions
@@ -716,192 +928,32 @@ int MSG_task_listen_from_host(const char *alias, m_host_t host)
  */
 int MSG_task_probe_from(m_channel_t channel)
 {
-	m_task_t task;
+  m_task_t task;
 
-	CHECK_HOST();
+  CHECK_HOST();
 
-	xbt_assert1((channel >= 0)
-			&& (channel < msg_global->max_channel), "Invalid channel %d",
-			channel);
+  xbt_assert1((channel >= 0)
+              && (channel < msg_global->max_channel), "Invalid channel %d",
+              channel);
 
-	if (NULL ==
-			(task =
-			 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
-				 (MSG_host_self(), channel))))
-		return -1;
+  if (NULL ==
+      (task =
+       MSG_mailbox_get_head(MSG_mailbox_get_by_channel
+                            (MSG_host_self(), channel))))
+    return -1;
 
-	return MSG_process_get_PID(task->simdata->sender);
+  return MSG_process_get_PID(task->simdata->sender);
 }
 
 int MSG_task_listen_from(const char *alias)
 {
-	m_task_t task;
-
-	CHECK_HOST();
-
-	if (NULL == (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
-		return -1;
-
-	return MSG_process_get_PID(task->simdata->sender);
-}
-
-/** \ingroup msg_gos_functions
- * \brief Wait for at most \a max_duration second for a task reception
- on \a channel.
-
- * \a PID is updated with the PID of the first process that triggered this event if any.
- *
- * It takes three parameters:
- * \param channel the channel on which the agent should be
- listening. This value has to be >=0 and < than the maximal.
- number of channels fixed with MSG_set_channel_number().
- * \param PID a memory location for storing an int.
- * \param timeout the maximum time to wait for a task before
- giving up. In the case of a reception, *\a PID will be updated
- with the PID of the first process to send a task.
- * \return #MSG_HOST_FAILURE if the host is shut down in the meantime
- and #MSG_OK otherwise.
- */
-	MSG_error_t
-MSG_channel_select_from(m_channel_t channel, double timeout, int *PID)
-{
-	m_host_t h = NULL;
-	simdata_host_t h_simdata = NULL;
-	m_task_t t;
-	int first_time = 1;
-	smx_cond_t cond;
-	msg_mailbox_t mailbox;
-
-	xbt_assert1((channel >= 0)
-			&& (channel < msg_global->max_channel), "Invalid channel %d",
-			channel);
-
-	if (PID) {
-		*PID = -1;
-	}
-
-	if (timeout == 0.0) {
-		*PID = MSG_task_probe_from(channel);
-		MSG_RETURN(MSG_OK);
-	} else {
-		CHECK_HOST();
-		h = MSG_host_self();
-		h_simdata = h->simdata;
-
-		mailbox = MSG_mailbox_get_by_channel(MSG_host_self(), channel);
-
-		while (MSG_mailbox_is_empty(mailbox)) {
-			if (timeout > 0) {
-				if (!first_time) {
-					MSG_RETURN(MSG_OK);
-				}
-			}
-
-			SIMIX_mutex_lock(h_simdata->mutex);
-
-			xbt_assert1(!MSG_mailbox_get_cond(mailbox),
-					"A process is already blocked on this channel %d", channel);
-
-			cond = SIMIX_cond_init();
-
-			MSG_mailbox_set_cond(mailbox, cond);
-
-			if (timeout > 0) {
-				SIMIX_cond_wait_timeout(cond, h_simdata->mutex, timeout);
-			} else {
-				SIMIX_cond_wait(cond, h_simdata->mutex);
-			}
-
-			SIMIX_cond_destroy(cond);
-			SIMIX_mutex_unlock(h_simdata->mutex);
-
-			if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
-				MSG_RETURN(MSG_HOST_FAILURE);
-			}
-
-			MSG_mailbox_set_cond(mailbox, NULL);
-			first_time = 0;
-		}
-
-		if (NULL == (t = MSG_mailbox_get_head(mailbox)))
-			MSG_RETURN(MSG_OK);
-
-
-		if (PID) {
-			*PID = MSG_process_get_PID(t->simdata->sender);
-		}
-
-		MSG_RETURN(MSG_OK);
-	}
-}
-
-
-MSG_error_t MSG_alias_select_from(const char *alias, double timeout, int *PID)
-{
-	m_host_t h = NULL;
-	simdata_host_t h_simdata = NULL;
-	m_task_t t;
-	int first_time = 1;
-	smx_cond_t cond;
-	msg_mailbox_t mailbox;
-
-	if (PID) {
-		*PID = -1;
-	}
-
-	if (timeout == 0.0) {
-		*PID = MSG_task_listen_from(alias);
-		MSG_RETURN(MSG_OK);
-	} else {
-		CHECK_HOST();
-		h = MSG_host_self();
-		h_simdata = h->simdata;
-
-		DEBUG2("Probing on alias %s (%s)", alias, h->name);
-
-		mailbox = MSG_mailbox_get_by_alias(alias);
-
-		while (MSG_mailbox_is_empty(mailbox)) {
-			if (timeout > 0) {
-				if (!first_time) {
-					MSG_RETURN(MSG_OK);
-				}
-			}
-
-			SIMIX_mutex_lock(h_simdata->mutex);
-
-			xbt_assert1(!MSG_mailbox_get_cond(mailbox),
-					"A process is already blocked on this alias %s", alias);
-
-			cond = SIMIX_cond_init();
-
-			MSG_mailbox_set_cond(mailbox, cond);
-
-			if (timeout > 0) {
-				SIMIX_cond_wait_timeout(cond, h_simdata->mutex, timeout);
-			} else {
-				SIMIX_cond_wait(cond, h_simdata->mutex);
-			}
-
-			SIMIX_cond_destroy(cond);
-			SIMIX_mutex_unlock(h_simdata->mutex);
-
-			if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
-				MSG_RETURN(MSG_HOST_FAILURE);
-			}
-
-			MSG_mailbox_set_cond(mailbox, NULL);
-			first_time = 0;
-		}
-
-		if (NULL == (t = MSG_mailbox_get_head(mailbox)))
-			MSG_RETURN(MSG_OK);
+  m_task_t task;
 
+  CHECK_HOST();
 
-		if (PID) {
-			*PID = MSG_process_get_PID(t->simdata->sender);
-		}
+  if (NULL ==
+      (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
+    return -1;
 
-		MSG_RETURN(MSG_OK);
-	}
+  return MSG_process_get_PID(task->simdata->sender);
 }