-/* $Id$ */
+/* $Id$ */
-/* Copyright (c) 2002,2003,2004 Arnaud Legrand. All rights reserved. */
+/* 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 "private.h"
+#include "msg/private.h"
#include "xbt/sysdep.h"
#include "xbt/log.h"
+#include "mailbox.h"
+
+
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
"Logging specific to MSG (gos)");
-/** \defgroup msg_gos_functions MSG Operating System Functions
- * \brief This section describes the functions that can be used
- * by an agent for handling some task.
+/** \ingroup msg_gos_functions
+ *
+ * \brief Return the last value returned by a MSG function (except
+ * MSG_get_errno...).
*/
+MSG_error_t
+MSG_get_errno(void)
+{
+ return PROCESS_GET_ERRNO();
+}
-static MSG_error_t __MSG_task_get_with_time_out_from_host(m_task_t * task,
- m_channel_t channel,
- double max_duration,
- m_host_t host)
+/** \ingroup msg_gos_functions
+ * \brief Executes a task and waits for its termination.
+ *
+ * This function is used for describing the behavior of an agent. It
+ * takes only one parameter.
+ * \param task a #m_task_t to execute on the location on which the
+ agent is running.
+ * \return #MSG_FATAL if \a task is not properly initialized and
+ * #MSG_OK otherwise.
+ */
+MSG_error_t
+MSG_task_execute(m_task_t task)
{
- m_process_t process = MSG_process_self();
- m_task_t t = NULL;
- m_host_t h = NULL;
- simdata_task_t t_simdata = NULL;
- simdata_host_t h_simdata = NULL;
- int first_time = 1;
- e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
- xbt_fifo_item_t item = NULL;
+ 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!");
+
+ DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
+
+ simdata->using++;
+ 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);
+
+ 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);
+ }
+}
- CHECK_HOST();
- xbt_assert1((channel>=0) && (channel < msg_global->max_channel),"Invalid channel %d",channel);
- /* Sanity check */
- xbt_assert0(task,"Null pointer for the task\n");
-
- if (*task)
- CRITICAL0("MSG_task_get() was asked to write in a non empty task struct.");
-
- /* Get the task */
- h = MSG_host_self();
- h_simdata = h->simdata;
-
- DEBUG2("Waiting for a task on channel %d (%s)", channel,h->name);
-
- while (1) {
- if(xbt_fifo_size(h_simdata->mbox[channel])>0) {
- if(!host) {
- t = xbt_fifo_shift(h_simdata->mbox[channel]);
- break;
- } else {
- xbt_fifo_foreach(h->simdata->mbox[channel],item,t,m_task_t) {
- if(t->simdata->source==host) break;
+/** \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);
}
- if(item) {
- xbt_fifo_remove_item(h->simdata->mbox[channel],item);
- break;
+
+}
+
+
+/** \ingroup msg_gos_functions
+ * \brief Sleep for the specified number of seconds
+ *
+ * Makes the current process sleep until \a time seconds have elapsed.
+ *
+ * \param nb_sec a number of second
+ */
+MSG_error_t
+MSG_process_sleep(double nb_sec)
+{
+ smx_action_t act_sleep;
+ m_process_t proc = MSG_process_self();
+ smx_mutex_t mutex;
+ smx_cond_t cond;
+
+ /* 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();
+
+ SIMIX_register_action_to_condition(act_sleep, cond);
+ SIMIX_cond_wait(cond, mutex);
+ 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_CPU_OFF)
+ {
+ SIMIX_action_destroy(act_sleep);
+ MSG_RETURN(MSG_HOST_FAILURE);
+ }
}
- }
- }
-
- if(max_duration>0) {
- if(!first_time) {
- PAJE_PROCESS_POP_STATE(process);
- PAJE_COMM_STOP(process,t,channel);
- MSG_RETURN(MSG_TRANSFER_FAILURE);
- }
- }
- xbt_assert3(!(h_simdata->sleeping[channel]),
- "A process (%s(%d)) is already blocked on channel %d",
- h_simdata->sleeping[channel]->name,
- h_simdata->sleeping[channel]->simdata->PID,
- channel);
- h_simdata->sleeping[channel] = process; /* I'm waiting. Wake me up when you're ready */
- if(max_duration>0) {
- __MSG_process_block(max_duration,"");
- } else {
- __MSG_process_block(-1,"");
- }
- h_simdata->sleeping[channel] = NULL;
- first_time = 0;
- if(surf_workstation_resource->extension_public->get_state(h_simdata->host)
- == SURF_CPU_OFF)
- MSG_RETURN(MSG_HOST_FAILURE);
- /* OK, we should both be ready now. Are you there ? */
- }
-
- DEBUG1("OK, got a task (%s)", t->name);
-
- t_simdata = t->simdata;
- /* *task = __MSG_task_copy(t); */
- *task=t;
-
- /* Transfer */
- t_simdata->using++;
-
- while(MSG_process_is_suspended(t_simdata->sender)) {
- DEBUG1("Oooups, the sender (%s) has been suspended in the meantime. Let's wait for him",
- t_simdata->sender->name);
- m_task_t task_to_wait_for = t_simdata->sender->simdata->waiting_task;
- if(__MSG_process_isBlocked(t_simdata->sender)) {
- DEBUG0("He's blocked. Let's wait for him to go in the suspended state");
- __MSG_process_unblock(t_simdata->sender);
- task_to_wait_for->simdata->using++;
- __MSG_task_wait_event(process, task_to_wait_for);
- MSG_task_destroy(task_to_wait_for);
- } else {
- DEBUG0("He's suspended. Let's wait for him to go in the resumed state");
- task_to_wait_for->simdata->using++;
- __MSG_task_wait_event(process, task_to_wait_for);
- MSG_task_destroy(task_to_wait_for);
- DEBUG0("He's resumed. He should block again. So let's free him.");
- __MSG_process_unblock(t_simdata->sender);
- break;
- }
- }
- DEBUG0("Calling SURF for communication creation");
- t_simdata->comm = surf_workstation_resource->extension_public->
- communicate(MSG_process_get_host(t_simdata->sender)->simdata->host,
- h->simdata->host, t_simdata->message_size,t_simdata->rate);
-
- surf_workstation_resource->common_public->action_set_data(t_simdata->comm,t);
-
- if(__MSG_process_isBlocked(t_simdata->sender)) {
- DEBUG1("Unblocking %s",t_simdata->sender->name);
- __MSG_process_unblock(t_simdata->sender);
- }
-
- PAJE_PROCESS_PUSH_STATE(process,"C",t);
-
- do {
- DEBUG0("Waiting for action termination");
- __MSG_task_wait_event(process, t);
- state=surf_workstation_resource->common_public->action_get_state(t_simdata->comm);
- } while (state==SURF_ACTION_RUNNING);
- DEBUG0("Action terminated");
-
- if(t->simdata->using>1) {
- xbt_fifo_unshift(msg_global->process_to_run,process);
- xbt_context_yield();
- }
-
- PAJE_PROCESS_POP_STATE(process);
- PAJE_COMM_STOP(process,t,channel);
-
- if(state == SURF_ACTION_DONE) {
- if(surf_workstation_resource->common_public->action_free(t_simdata->comm))
- t_simdata->comm = NULL;
- MSG_RETURN(MSG_OK);
- } else if(surf_workstation_resource->extension_public->get_state(h_simdata->host)
- == SURF_CPU_OFF) {
- if(surf_workstation_resource->common_public->action_free(t_simdata->comm))
- t_simdata->comm = NULL;
- MSG_RETURN(MSG_HOST_FAILURE);
- } else {
- if(surf_workstation_resource->common_public->action_free(t_simdata->comm))
- t_simdata->comm = NULL;
- MSG_RETURN(MSG_TRANSFER_FAILURE);
- }
+ else
+ {
+ SIMIX_action_destroy(act_sleep);
+ MSG_RETURN(MSG_HOST_FAILURE);
+ }
+
+ MSG_RETURN(MSG_OK);
}
/** \ingroup msg_gos_functions
- * \brief Listen on a channel and wait for receiving a task.
+ * \brief Return the number of MSG tasks currently running on
+ * the host of the current running process.
+ */
+static int
+MSG_get_msgload(void)
+{
+ xbt_die("not implemented yet");
+ return 0;
+}
+
+
+
+/** \ingroup msg_gos_functions
+ * \brief Listen on \a channel and waits for receiving a task from \a host.
*
- * It takes two parameters.
+ * It takes three parameters.
* \param task a memory location for storing a #m_task_t. It will
hold a task when this function will return. Thus \a task should not
be equal to \c NULL and \a *task should be equal to \c NULL. If one of
* \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 host the host that is to be watched.
* \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.
+ if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
*/
-MSG_error_t MSG_task_get(m_task_t * task,
- m_channel_t channel)
+MSG_error_t
+MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
{
- return MSG_task_get_with_time_out(task, channel, -1);
+ return MSG_task_get_ext(task, channel, -1, host);
}
/** \ingroup msg_gos_functions
- * \brief Listen on a channel and wait for receiving a task with a timeout.
+ * \brief Listen on a channel and wait for receiving a task.
*
- * It takes three parameters.
+ * It takes two parameters.
* \param task a memory location for storing a #m_task_t. It will
hold a task when this function will return. Thus \a task should not
be equal to \c NULL and \a *task should be equal to \c NULL. If one of
* \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 max_duration the maximum time to wait for a task before giving
- up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
- will not be modified and will still be
- equal to \c NULL when returning.
* \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.
+ * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
*/
-MSG_error_t MSG_task_get_with_time_out(m_task_t * task,
- m_channel_t channel,
- double max_duration)
+MSG_error_t
+MSG_task_get(m_task_t * task, m_channel_t channel)
{
- return __MSG_task_get_with_time_out_from_host(task, channel, max_duration, NULL);
+ return MSG_task_get_with_timeout(task, channel, -1);
}
/** \ingroup msg_gos_functions
- * \brief Listen on \a channel and waits for receiving a task from \a host.
+ * \brief Listen on a channel and wait for receiving a task with a timeout.
*
* It takes three parameters.
* \param task a memory location for storing a #m_task_t. It will
* \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 host the host that is to be watched.
+ * \param max_duration the maximum time to wait for a task before giving
+ up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
+ will not be modified and will still be
+ equal to \c NULL when returning.
* \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_task_get_from_host(m_task_t * task, int channel,
- m_host_t host)
+MSG_error_t
+MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel, double max_duration)
{
- return __MSG_task_get_with_time_out_from_host(task, channel, -1, host);
+ return MSG_task_get_ext(task, channel, max_duration, NULL);
}
-/** \ingroup msg_gos_functions
- * \brief Test whether there is a pending communication on a channel.
- *
- * It takes one parameter.
- * \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().
- * \return 1 if there is a pending communication and 0 otherwise
+/** \defgroup msg_gos_functions MSG Operating System Functions
+ * \brief This section describes the functions that can be used
+ * by an agent for handling some task.
*/
-int MSG_task_Iprobe(m_channel_t channel)
-{
- m_host_t h = NULL;
- simdata_host_t h_simdata = NULL;
- xbt_assert1((channel>=0) && (channel < msg_global->max_channel),"Invalid channel %d",channel);
- DEBUG2("Probing on channel %d (%s)", channel,h->name);
- CHECK_HOST();
- h = MSG_host_self();
- h_simdata = h->simdata;
- return(xbt_fifo_get_first_item(h_simdata->mbox[channel])!=NULL);
+MSG_error_t
+MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,m_host_t host)
+{
+ 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);
}
-/** \ingroup msg_gos_functions
- * \brief Test whether there is a pending communication on a channel, and who sent it.
- *
- * It takes one parameter.
- * \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().
- * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
- */
-int MSG_task_probe_from(m_channel_t channel)
+MSG_error_t
+MSG_task_receive_from_host(m_task_t * task, const char* alias, m_host_t host)
{
- m_host_t h = NULL;
- simdata_host_t h_simdata = NULL;
- xbt_fifo_item_t item;
- m_task_t t;
-
- xbt_assert1((channel>=0) && (channel < msg_global->max_channel),"Invalid channel %d",channel);
- CHECK_HOST();
- h = MSG_host_self();
- h_simdata = h->simdata;
-
- DEBUG2("Probing on channel %d (%s)", channel,h->name);
-
- item = xbt_fifo_get_first_item(h->simdata->mbox[channel]);
- if (!item || !(t = xbt_fifo_get_item_content(item)))
- return -1;
-
- return MSG_process_get_PID(t->simdata->sender);
+ return MSG_task_receive_ext(task, alias, -1, host);
}
-/** \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 max_duration 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 max_duration,
- int *PID)
+MSG_error_t
+MSG_task_receive(m_task_t * task, const char* alias)
{
- m_host_t h = NULL;
- simdata_host_t h_simdata = NULL;
- xbt_fifo_item_t item;
- m_task_t t;
- int first_time = 1;
- m_process_t process = MSG_process_self();
-
- xbt_assert1((channel>=0) && (channel < msg_global->max_channel),"Invalid channel %d",channel);
- if(PID) {
- *PID = -1;
- }
-
- if(max_duration==0.0) {
- *PID = MSG_task_probe_from(channel);
- MSG_RETURN(MSG_OK);
- } else {
- CHECK_HOST();
- h = MSG_host_self();
- h_simdata = h->simdata;
-
- DEBUG2("Probing on channel %d (%s)", channel,h->name);
- while(!(item = xbt_fifo_get_first_item(h->simdata->mbox[channel]))) {
- if(max_duration>0) {
- if(!first_time) {
- MSG_RETURN(MSG_OK);
- }
- }
- xbt_assert2(!(h_simdata->sleeping[channel]),
- "A process (%s(%d)) is already blocked on this channel",
- h_simdata->sleeping[channel]->name,
- h_simdata->sleeping[channel]->simdata->PID);
- h_simdata->sleeping[channel] = process; /* I'm waiting. Wake me up when you're ready */
- if(max_duration>0) {
- __MSG_process_block(max_duration,"");
- } else {
- __MSG_process_block(-1,"");
- }
- if(surf_workstation_resource->extension_public->get_state(h_simdata->host)
- == SURF_CPU_OFF) {
- MSG_RETURN(MSG_HOST_FAILURE);
- }
- h_simdata->sleeping[channel] = NULL;
- first_time = 0;
- }
- if (!item || !(t = xbt_fifo_get_item_content(item))) {
- MSG_RETURN(MSG_OK);
- }
- if(PID) {
- *PID = MSG_process_get_PID(t->simdata->sender);
- }
- MSG_RETURN(MSG_OK);
- }
+ return MSG_task_receive_with_timeout(task, alias, -1);
}
-
-/** \ingroup msg_gos_functions
-
- * \brief Return the number of tasks waiting to be received on a \a
- channel and sent by \a host.
- *
- * It takes two 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 host the host that is to be watched.
- * \return the number of tasks waiting to be received on \a channel
- and sent by \a host.
- */
-int MSG_task_probe_from_host(int channel, m_host_t host)
+MSG_error_t
+MSG_task_receive_with_timeout(m_task_t * task, const char* alias, double timeout)
{
- simdata_host_t h_simdata = NULL;
- xbt_fifo_item_t item;
- m_task_t t;
- int count = 0;
- m_host_t h = NULL;
-
- xbt_assert1((channel>=0) && (channel < msg_global->max_channel),"Invalid channel %d",channel);
- CHECK_HOST();
- h = MSG_host_self();
- h_simdata = h->simdata;
-
- DEBUG2("Probing on channel %d (%s)", channel,h->name);
-
- xbt_fifo_foreach(h->simdata->mbox[channel],item,t,m_task_t) {
- if(t->simdata->source==host) count++;
- }
-
- return count;
+ return MSG_task_receive_ext(task, alias, timeout, NULL);
}
-/** \ingroup msg_gos_functions \brief Put a task on a channel of an
- * host (with a timeout on the waiting of the destination host) and
- * waits for the end of the transmission.
- *
- * This function is used for describing the behavior of an agent. It
- * takes four parameter.
- * \param task a #m_task_t to send on another location. This task
- will not be usable anymore when the function will return. There is
- no automatic task duplication and you have to save your parameters
- before calling this function. Tasks are unique and once it has been
- sent to another location, you should not access it anymore. You do
- not need to call MSG_task_destroy() but to avoid using, as an
- effect of inattention, this task anymore, you definitely should
- renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
- can be transfered iff it has been correctly created with
- MSG_task_create().
- * \param dest the destination of the message
- * \param channel the channel on which the agent should put this
- task. This value has to be >=0 and < than the maximal number of
- channels fixed with MSG_set_channel_number().
- * \param max_duration the maximum time to wait for a task before giving
- up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
- will not be modified
- * \return #MSG_FATAL if \a task is not properly initialized and
- #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
- 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 max_duration)
+MSG_error_t
+MSG_task_receive_ext(m_task_t* task, const char* alias, double timeout, m_host_t host)
{
- m_process_t process = MSG_process_self();
- simdata_task_t task_simdata = NULL;
- e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
- m_host_t local_host = NULL;
- m_host_t remote_host = NULL;
- int first_time = 1;
-
- CHECK_HOST();
+ return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task, host, timeout);
+}
- xbt_assert1((channel>=0) && (channel < msg_global->max_channel),"Invalid channel %d",channel);
- task_simdata = task->simdata;
- task_simdata->sender = process;
- task_simdata->source = MSG_process_get_host(process);
- xbt_assert0(task_simdata->using==1,
- "This taks is still being used somewhere else. You cannot send it now. Go fix your code!");
- task_simdata->comm = NULL;
-
- local_host = ((simdata_process_t) process->simdata)->host;
- remote_host = dest;
-
- DEBUG4("Trying to send a task (%g kB) from %s to %s on channel %d",
- task->simdata->message_size/1000,local_host->name, remote_host->name, channel);
-
- xbt_fifo_push(((simdata_host_t) remote_host->simdata)->
- mbox[channel], task);
-
- PAJE_COMM_START(process,task,channel);
-
- if(remote_host->simdata->sleeping[channel]) {
- DEBUG0("Somebody is listening. Let's wake him up!");
- __MSG_process_unblock(remote_host->simdata->sleeping[channel]);
- }
-
- process->simdata->put_host = dest;
- process->simdata->put_channel = channel;
- while(!(task_simdata->comm)) {
- if(max_duration>0) {
- if(!first_time) {
- PAJE_PROCESS_POP_STATE(process);
- PAJE_COMM_STOP(process,task,channel);
- MSG_RETURN(MSG_TRANSFER_FAILURE);
- }
- }
- DEBUG0("Communication not initiated yet. Let's block!");
- if(max_duration>0)
- __MSG_process_block(max_duration,task->name);
- else
- __MSG_process_block(-1,task->name);
-
- first_time = 0;
-
- if(surf_workstation_resource->extension_public->
- get_state(local_host->simdata->host) == SURF_CPU_OFF) {
- xbt_fifo_remove(((simdata_host_t) remote_host->simdata)->mbox[channel],
- task);
- PAJE_PROCESS_POP_STATE(process);
- PAJE_COMM_STOP(process,task,channel);
- MSG_task_destroy(task);
- MSG_RETURN(MSG_HOST_FAILURE);
- }
- }
- DEBUG0("Registering to this communication");
- surf_workstation_resource->common_public->action_use(task_simdata->comm);
- process->simdata->put_host = NULL;
- process->simdata->put_channel = -1;
-
-
- PAJE_PROCESS_PUSH_STATE(process,"C",task);
-
- state=surf_workstation_resource->common_public->action_get_state(task_simdata->comm);
- while (state==SURF_ACTION_RUNNING) {
- DEBUG0("Waiting for action termination");
- __MSG_task_wait_event(process, task);
- state=surf_workstation_resource->common_public->action_get_state(task_simdata->comm);
- }
- DEBUG0("Action terminated");
- task->simdata->rate=-1.0; /* Sets the rate back to default */
-
- PAJE_PROCESS_POP_STATE(process);
-
- if(state == SURF_ACTION_DONE) {
- if(surf_workstation_resource->common_public->action_free(task_simdata->comm))
- task_simdata->comm = NULL;
- MSG_task_destroy(task);
- MSG_RETURN(MSG_OK);
- } else if(surf_workstation_resource->extension_public->get_state(local_host->simdata->host)
- == SURF_CPU_OFF) {
- if(surf_workstation_resource->common_public->action_free(task_simdata->comm))
- task_simdata->comm = NULL;
- MSG_task_destroy(task);
- MSG_RETURN(MSG_HOST_FAILURE);
- } else {
- if(surf_workstation_resource->common_public->action_free(task_simdata->comm))
- task_simdata->comm = NULL;
- MSG_task_destroy(task);
- MSG_RETURN(MSG_TRANSFER_FAILURE);
- }
-}
/** \ingroup msg_gos_functions
* \brief Put a task on a channel of an host and waits for the end of the
* transmission.
* #MSG_TRANSFER_FAILURE if the transfer could not be properly done
* (network failure, dest failure)
*/
-MSG_error_t MSG_task_put(m_task_t task,
- m_host_t dest, m_channel_t channel)
+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
*
* \sa MSG_task_put
*/
-MSG_error_t MSG_task_put_bounded(m_task_t task,
- m_host_t dest, m_channel_t channel,
- double max_rate)
+MSG_error_t
+MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel, double maxrate)
{
- MSG_error_t res = MSG_OK;
- task->simdata->rate=max_rate;
- res = MSG_task_put(task, dest, channel);
- return(res);
+ task->simdata->rate = maxrate;
+ return MSG_task_put(task, dest, channel);
}
-/** \ingroup msg_gos_functions
- * \brief Executes a task and waits for its termination.
+/** \ingroup msg_gos_functions \brief Put a task on a channel of an
+ * host (with a timeout on the waiting of the destination host) and
+ * waits for the end of the transmission.
*
* This function is used for describing the behavior of an agent. It
- * takes only one parameter.
- * \param task a #m_task_t to execute on the location on which the
- agent is running.
+ * takes four parameter.
+ * \param task a #m_task_t to send on another location. This task
+ will not be usable anymore when the function will return. There is
+ no automatic task duplication and you have to save your parameters
+ before calling this function. Tasks are unique and once it has been
+ sent to another location, you should not access it anymore. You do
+ not need to call MSG_task_destroy() but to avoid using, as an
+ effect of inattention, this task anymore, you definitely should
+ renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
+ can be transfered iff it has been correctly created with
+ MSG_task_create().
+ * \param dest the destination of the message
+ * \param channel the channel on which the agent should put this
+ task. This value has to be >=0 and < than the maximal number of
+ channels fixed with MSG_set_channel_number().
+ * \param timeout the maximum time to wait for a task before giving
+ up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
+ will not be modified
* \return #MSG_FATAL if \a task is not properly initialized and
- * #MSG_OK otherwise.
+ #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
+ 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_execute(m_task_t task)
+MSG_error_t
+MSG_task_put_with_timeout(m_task_t task, m_host_t dest, m_channel_t channel, double timeout)
{
- m_process_t process = MSG_process_self();
- MSG_error_t res;
+ 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("Computing on %s", process->simdata->host->name);
+MSG_error_t
+MSG_task_send(m_task_t task,const char* alias)
+{
+ return MSG_task_send_with_timeout(task, alias, -1);
+}
- __MSG_task_execute(process, task);
- PAJE_PROCESS_PUSH_STATE(process,"E",task);
- res = __MSG_wait_for_computation(process,task);
- PAJE_PROCESS_POP_STATE(process);
- return res;
+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);
}
-void __MSG_task_execute(m_process_t process, m_task_t task)
+
+MSG_error_t
+MSG_task_send_with_timeout(m_task_t task, const char* alias, double timeout)
{
- simdata_task_t simdata = NULL;
-
- CHECK_HOST();
-
- simdata = task->simdata;
- xbt_assert0((!simdata->compute)&&(task->simdata->using==1),
- "This taks is executed somewhere else. Go fix your code!");
- task->simdata->using++;
- simdata->compute = surf_workstation_resource->extension_public->
- execute(MSG_process_get_host(process)->simdata->host,
- simdata->computation_amount);
- surf_workstation_resource->common_public->
- set_priority(simdata->compute, simdata->priority);
-
- surf_workstation_resource->common_public->action_set_data(simdata->compute,task);
- task->simdata->using--;
+ return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias), task, timeout);
}
-MSG_error_t __MSG_wait_for_computation(m_process_t process, m_task_t task)
+int
+MSG_task_listen(const char* alias)
{
- e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
- simdata_task_t simdata = task->simdata;
-
- XBT_IN4("(%p(%s) %p(%s))",process,process->name,task,task->name);
- simdata->using++;
- do {
- __MSG_task_wait_event(process, task);
- state=surf_workstation_resource->common_public->action_get_state(simdata->compute);
- } while (state==SURF_ACTION_RUNNING);
- simdata->using--;
-
-
- if(state == SURF_ACTION_DONE) {
- if(surf_workstation_resource->common_public->action_free(simdata->compute))
- simdata->compute = NULL;
- simdata->computation_amount = 0.0;
- XBT_OUT;
- MSG_RETURN(MSG_OK);
- } else if(surf_workstation_resource->extension_public->
- get_state(MSG_process_get_host(process)->simdata->host)
- == SURF_CPU_OFF) {
- if(surf_workstation_resource->common_public->action_free(simdata->compute))
- simdata->compute = NULL;
- XBT_OUT;
- MSG_RETURN(MSG_HOST_FAILURE);
- } else {
- if(surf_workstation_resource->common_public->action_free(simdata->compute))
- simdata->compute = NULL;
- XBT_OUT;
- MSG_RETURN(MSG_TASK_CANCELLED);
- }
+ CHECK_HOST();
+
+ return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
}
-/** \ingroup m_task_management
- * \brief Creates a new #m_task_t (a parallel one....).
+
+/** \ingroup msg_gos_functions
+ * \brief Test whether there is a pending communication on a channel.
*
- * 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.
+ * It takes one parameter.
+ * \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().
+ * \return 1 if there is a pending communication and 0 otherwise
*/
-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
+MSG_task_Iprobe(m_channel_t channel)
{
- simdata_task_t simdata = xbt_new0(s_simdata_task_t,1);
- m_task_t task = xbt_new0(s_m_task_t,1);
- int i;
-
- /* Task structure */
- task->name = xbt_strdup(name);
- task->simdata = simdata;
- task->data = data;
-
- /* Simulator Data */
- simdata->sleeping = xbt_dynar_new(sizeof(m_process_t),NULL);
- simdata->rate = -1.0;
- simdata->using = 1;
- simdata->sender = NULL;
- simdata->source = NULL;
- simdata->host_nb = host_nb;
+ xbt_assert1((channel >= 0) && (channel < msg_global->max_channel), "Invalid channel %d", channel);
- simdata->host_list = xbt_new0(void *, 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->host;
-
- return task;
+ CHECK_HOST();
+
+ return !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel(MSG_host_self(), channel));
}
+/** \ingroup msg_gos_functions
-static void __MSG_parallel_task_execute(m_process_t process, m_task_t task)
+ * \brief Return the number of tasks waiting to be received on a \a
+ channel and sent by \a host.
+ *
+ * It takes two 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 host the host that is to be watched.
+ * \return the number of tasks waiting to be received on \a channel
+ and sent by \a host.
+ */
+int
+MSG_task_probe_from_host(int channel, m_host_t host)
{
- simdata_task_t simdata = NULL;
-
- CHECK_HOST();
-
- simdata = task->simdata;
-
- xbt_assert0(simdata->host_nb,"This is not a parallel task. Go to hell.");
-
- simdata->compute = surf_workstation_resource->extension_public->
- execute_parallel_task(task->simdata->host_nb,
- task->simdata->host_list,
- task->simdata->comp_amount,
- task->simdata->comm_amount,
- 1.0,
- -1.0);
- if(simdata->compute)
- surf_workstation_resource->common_public->action_set_data(simdata->compute,task);
+ xbt_assert1((channel >= 0) && (channel < msg_global->max_channel), "Invalid channel %d", channel);
+
+ CHECK_HOST();
+
+ return MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel(MSG_host_self(), channel),host);
+
}
-MSG_error_t MSG_parallel_task_execute(m_task_t task)
+int
+MSG_task_listen_from_host(const char* alias, m_host_t host)
{
- m_process_t process = MSG_process_self();
- MSG_error_t res;
-
- DEBUG0("Computing on a tons of guys");
-
- __MSG_parallel_task_execute(process, task);
-
- if(task->simdata->compute)
- res = __MSG_wait_for_computation(process,task);
- else
- res = MSG_OK;
-
- return res;
+ CHECK_HOST();
+
+ return MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias(alias),host);
}
-
/** \ingroup msg_gos_functions
- * \brief Sleep for the specified number of seconds
- *
- * Makes the current process sleep until \a time seconds have elapsed.
+ * \brief Test whether there is a pending communication on a channel, and who sent it.
*
- * \param nb_sec a number of second
+ * It takes one parameter.
+ * \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().
+ * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
*/
-MSG_error_t MSG_process_sleep(double nb_sec)
+int
+MSG_task_probe_from(m_channel_t channel)
{
- e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
- m_process_t process = MSG_process_self();
- m_task_t dummy = NULL;
- simdata_task_t simdata = NULL;
+ m_task_t task;
- CHECK_HOST();
- dummy = MSG_task_create("MSG_sleep", nb_sec, 0.0, NULL);
- simdata = dummy->simdata;
+ CHECK_HOST();
+
+ xbt_assert1((channel >= 0) && (channel < msg_global->max_channel), "Invalid channel %d", channel);
- simdata->compute = surf_workstation_resource->extension_public->
- sleep(MSG_process_get_host(process)->simdata->host,
- simdata->computation_amount);
- surf_workstation_resource->common_public->action_set_data(simdata->compute,dummy);
+ if(NULL == (task = MSG_mailbox_get_head(MSG_mailbox_get_by_channel(MSG_host_self(), channel))))
+ return -1;
-
- simdata->using++;
- do {
- __MSG_task_wait_event(process, dummy);
- state=surf_workstation_resource->common_public->action_get_state(simdata->compute);
- } while (state==SURF_ACTION_RUNNING);
- simdata->using--;
-
- if(state == SURF_ACTION_DONE) {
- if(surf_workstation_resource->extension_public->
- get_state(MSG_process_get_host(process)->simdata->host)
- == SURF_CPU_OFF) {
- if(surf_workstation_resource->common_public->action_free(simdata->compute))
- simdata->compute = NULL;
- MSG_RETURN(MSG_HOST_FAILURE);
- }
- if(__MSG_process_isBlocked(process)) {
- __MSG_process_unblock(MSG_process_self());
- }
- if(surf_workstation_resource->extension_public->
- get_state(MSG_process_get_host(process)->simdata->host)
- == SURF_CPU_OFF) {
- if(surf_workstation_resource->common_public->action_free(simdata->compute))
- simdata->compute = NULL;
- MSG_RETURN(MSG_HOST_FAILURE);
- }
- if(surf_workstation_resource->common_public->action_free(simdata->compute))
- simdata->compute = NULL;
- MSG_task_destroy(dummy);
- MSG_RETURN(MSG_OK);
- } else MSG_RETURN(MSG_HOST_FAILURE);
+ return MSG_process_get_PID(task->simdata->sender);
}
-/** \ingroup msg_gos_functions
- * \brief Return the number of MSG tasks currently running on
- * the host of the current running process.
- */
-static int MSG_get_msgload(void)
+int
+MSG_task_listen_from(const char* alias)
{
- m_process_t process;
-
- CHECK_HOST();
-
- xbt_assert0(0, "This function is still to be specified correctly (what do you mean by 'load', exactly?). In the meantime, please don't use it");
- process = MSG_process_self();
- return xbt_fifo_size(process->simdata->host->simdata->process_list);
+ 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.
*
- * \brief Return the last value returned by a MSG function (except
- * MSG_get_errno...).
+ * 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_get_errno(void)
+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)
{
- return PROCESS_GET_ERRNO();
+ 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);
+
+
+ if (PID)
+ {
+ *PID = MSG_process_get_PID(t->simdata->sender);
+ }
+
+ MSG_RETURN(MSG_OK);
+ }
}
+
+
+
+
+
