-/* $Id$ */
-
-/* Copyright (c) 2002-2007 Arnaud Legrand. */
-/* Copyright (c) 2007 Bruno Donassolo. */
-/* All rights reserved. */
+/* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
+ * 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 "simix/private.h"
#include "xbt/sysdep.h"
+#include "mc/mc.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.
- */
-
-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)
-{
-
- 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;
- xbt_fifo_item_t item = NULL;
-
- smx_cond_t cond = NULL; //conditional wait if the task isn't on the channel yet
-
- 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);
-
- SIMIX_mutex_lock(h->simdata->mutex);
- 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;
- }
- if(item) {
- xbt_fifo_remove_item(h->simdata->mbox[channel],item);
- break;
- }
- }
- }
-
- if(max_duration>0) {
- if(!first_time) {
- SIMIX_mutex_unlock(h->simdata->mutex);
- h_simdata->sleeping[channel] = NULL;
- SIMIX_cond_destroy(cond);
- MSG_RETURN(MSG_TRANSFER_FAILURE);
- }
- }
- xbt_assert1(!(h_simdata->sleeping[channel]),"A process is already blocked on channel %d", channel);
-
- cond = SIMIX_cond_init();
- h_simdata->sleeping[channel] = cond;
- if (max_duration > 0) {
- SIMIX_cond_wait_timeout(cond, h->simdata->mutex, max_duration);
- }
- else SIMIX_cond_wait(h_simdata->sleeping[channel],h->simdata->mutex);
-
- if(SIMIX_host_get_state(h_simdata->host)==0)
- MSG_RETURN(MSG_HOST_FAILURE);
-
- first_time = 0;
- }
- SIMIX_mutex_unlock(h->simdata->mutex);
-
- DEBUG1("OK, got a task (%s)", t->name);
- /* clean conditional */
- if (cond) {
- SIMIX_cond_destroy(cond);
- h_simdata->sleeping[channel] = NULL;
- }
-
- t_simdata = t->simdata;
- t_simdata->receiver = process;
- *task=t;
-
- SIMIX_mutex_lock(t_simdata->mutex);
-
- /* Transfer */
- t_simdata->using++;
- /* create SIMIX action to the communication */
- t_simdata->comm = SIMIX_action_communicate(t_simdata->sender->simdata->host->simdata->host,
- process->simdata->host->simdata->host,t->name, t_simdata->message_size,
- t_simdata->rate);
- /* if the process is suspend, create the action but stop its execution, it will be restart when the sender process resume */
- if (MSG_process_is_suspended(t_simdata->sender)) {
- DEBUG1("Process sender (%s) suspended", t_simdata->sender->name);
- SIMIX_action_set_priority(t_simdata->comm,0);
- }
- process->simdata->waiting_task = t;
- SIMIX_register_action_to_condition(t_simdata->comm, t_simdata->cond);
- SIMIX_register_condition_to_action(t_simdata->comm, t_simdata->cond);
- SIMIX_cond_wait(t_simdata->cond,t_simdata->mutex);
- process->simdata->waiting_task = NULL;
-
- /* the task has already finished and the pointer must be null*/
- if (t->simdata->sender) {
- t->simdata->sender->simdata->waiting_task = NULL;
- /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
- //t->simdata->comm = NULL;
- //t->simdata->compute = NULL;
- }
- /* for this process, don't need to change in get function*/
- t->simdata->receiver = NULL;
- SIMIX_mutex_unlock(t_simdata->mutex);
-
-
- if(SIMIX_action_get_state(t_simdata->comm) == SURF_ACTION_DONE) {
- //t_simdata->comm = NULL;
- SIMIX_action_destroy(t_simdata->comm);
- t_simdata->comm = NULL;
- MSG_RETURN(MSG_OK);
- } else if (SIMIX_host_get_state(h_simdata->host)==0) {
- //t_simdata->comm = NULL;
- SIMIX_action_destroy(t_simdata->comm);
- t_simdata->comm = NULL;
- MSG_RETURN(MSG_HOST_FAILURE);
- } else {
- //t_simdata->comm = NULL;
- SIMIX_action_destroy(t_simdata->comm);
- t_simdata->comm = NULL;
- MSG_RETURN(MSG_TRANSFER_FAILURE);
- }
-
-}
-
-/** \ingroup msg_gos_functions
- * \brief Listen on a channel and wait for receiving a task.
- *
- * 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
- those two condition does not hold, there will be a warning message.
- * \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 #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(m_task_t * task,
- m_channel_t channel)
-{
- return MSG_task_get_with_time_out(task, channel, -1);
-}
-
-/** \ingroup msg_gos_functions
- * \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
- 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
- those two condition does not hold, there will be a warning message.
- * \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.
- */
-MSG_error_t MSG_task_get_with_time_out(m_task_t * task,
- m_channel_t channel,
- double max_duration)
-{
- return __MSG_task_get_with_time_out_from_host(task, channel, max_duration, NULL);
-}
-
-/** \ingroup msg_gos_functions
- * \brief Listen on \a channel and waits for receiving a task from \a host.
- *
- * 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
- those two condition does not hold, there will be a warning message.
- * \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.
- */
-MSG_error_t MSG_task_get_from_host(m_task_t * task, int channel,
- m_host_t host)
-{
- return __MSG_task_get_with_time_out_from_host(task, channel, -1, host);
-}
-
-/** \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
- */
-int MSG_task_Iprobe(m_channel_t channel)
-{
- m_host_t h = NULL;
-
- xbt_assert1((channel>=0) && (channel < msg_global->max_channel),"Invalid channel %d",channel);
- CHECK_HOST();
-
- DEBUG2("Probing on channel %d (%s)", channel,h->name);
-
- h = MSG_host_self();
- return(xbt_fifo_get_first_item(h->simdata->mbox[channel])!=NULL);
-}
-
-/** \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)
-{
- m_host_t h = 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();
-
- 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);
-}
-
-/** \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)
-{
- m_host_t h = NULL;
- simdata_host_t h_simdata = NULL;
- xbt_fifo_item_t item;
- m_task_t t;
- int first_time = 1;
- smx_cond_t cond;
-
- 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);
- }
- }
- SIMIX_mutex_lock(h_simdata->mutex);
- xbt_assert1(!(h_simdata->sleeping[channel]),
- "A process is already blocked on this channel %d", channel);
- cond = SIMIX_cond_init();
- h_simdata->sleeping[channel] = cond; /* I'm waiting. Wake me up when you're ready */
- if(max_duration>0) {
- SIMIX_cond_wait_timeout(cond,h_simdata->mutex, max_duration);
- } 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->host)==0) {
- 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);
- }
-}
-
-
-/** \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)
-{
- 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();
-
- 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;
-}
-
-/** \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)
-{
-
-
- m_process_t process = MSG_process_self();
- simdata_task_t task_simdata = NULL;
- m_host_t local_host = NULL;
- m_host_t remote_host = NULL;
- CHECK_HOST();
-
- 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 task 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);
-
- SIMIX_mutex_lock(remote_host->simdata->mutex);
- xbt_fifo_push(((simdata_host_t) remote_host->simdata)->
- mbox[channel], task);
-
- if(remote_host->simdata->sleeping[channel]) {
- DEBUG0("Somebody is listening. Let's wake him up!");
- SIMIX_cond_signal(remote_host->simdata->sleeping[channel]);
- }
- SIMIX_mutex_unlock(remote_host->simdata->mutex);
-
- process->simdata->put_host = dest;
- process->simdata->put_channel = channel;
- SIMIX_mutex_lock(task->simdata->mutex);
- // DEBUG4("Task sent (%g kB) from %s to %s on channel %d, waiting...", task->simdata->message_size/1000,local_host->name, remote_host->name, channel);
-
- process->simdata->waiting_task = task;
- if (max_duration >0) {
- SIMIX_cond_wait_timeout(task->simdata->cond,task->simdata->mutex,max_duration);
- /* verify if the timeout happened and the communication didn't started yet */
- if (task->simdata->comm==NULL) {
- task->simdata->using--;
- process->simdata->waiting_task = NULL;
- xbt_fifo_remove(((simdata_host_t) remote_host->simdata)->mbox[channel],
- task);
- if (task->simdata->receiver) {
- task->simdata->receiver->simdata->waiting_task = NULL;
- }
- task->simdata->sender = NULL;
- SIMIX_mutex_unlock(task->simdata->mutex);
- MSG_RETURN(MSG_TRANSFER_FAILURE);
- }
- }
- else {
- SIMIX_cond_wait(task->simdata->cond,task->simdata->mutex);
- }
-
- DEBUG1("Action terminated %s",task->name);
- task->simdata->using--;
- process->simdata->waiting_task = NULL;
- /* the task has already finished and the pointer must be null*/
- if (task->simdata->receiver) {
- task->simdata->receiver->simdata->waiting_task = NULL;
- /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
- // task->simdata->comm = NULL;
- //task->simdata->compute = NULL;
- }
- task->simdata->sender = NULL;
- SIMIX_mutex_unlock(task->simdata->mutex);
-
- if(SIMIX_action_get_state(task->simdata->comm) == SURF_ACTION_DONE) {
- MSG_RETURN(MSG_OK);
- } else if (SIMIX_host_get_state(local_host->simdata->host)==0) {
- MSG_RETURN(MSG_HOST_FAILURE);
- } else {
- 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.
- *
- * This function is used for describing the behavior of an agent. It
- * takes three 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().
- * \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)
- */
-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);
-}
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
+ "Logging specific to MSG (gos)");
/** \ingroup msg_gos_functions
- * \brief Does exactly the same as MSG_task_put but with a bounded transmition
- * rate.
*
- * \sa MSG_task_put
+ * \brief Return the last value returned by a MSG function (except
+ * MSG_get_errno...).
*/
-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_get_errno(void)
{
- MSG_error_t res = MSG_OK;
- task->simdata->rate=max_rate;
- res = MSG_task_put(task, dest, channel);
- return(res);
+ return PROCESS_GET_ERRNO();
}
/** \ingroup msg_gos_functions
* 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.
+ agent is running.
* \return #MSG_FATAL if \a task is not properly initialized and
* #MSG_OK otherwise.
*/
{
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->host->name);
- simdata->using++;
+ e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
+ CHECK_HOST();
+
+ simdata = task->simdata;
+
+ xbt_assert0(simdata->host_nb==0, "This is a parallel task. Go to hell.");
+
+#ifdef HAVE_TRACING
+ 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);
+
+ DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
+
+ if (simdata->computation_amount == 0) {
+#ifdef HAVE_TRACING
+ 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);
+ 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;
+ /* 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);
- SIMIX_register_condition_to_action(simdata->compute, simdata->cond);
- SIMIX_cond_wait(simdata->cond, simdata->mutex);
- self->simdata->waiting_task = NULL;
+ 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->using--;
+ simdata->refcount--;
- if(SIMIX_action_get_state(task->simdata->compute) == SURF_ACTION_DONE) {
+ 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) {
+#ifdef HAVE_TRACING
+ TRACE_msg_task_execute_end (task);
+#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;
- MSG_RETURN(MSG_HOST_FAILURE);
- } else {
+#ifdef HAVE_TRACING
+ 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_TASK_CANCELLED);
- }
+#ifdef HAVE_TRACING
+ TRACE_msg_task_execute_end (task);
+#endif
+ MSG_RETURN(MSG_TASK_CANCELLED);
+ }
}
-
/** \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.
+ * 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.
+ 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].
+ 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.
+ 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)
+ 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;
+ 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(void *, host_nb);
- simdata->comp_amount = computation_amount;
- simdata->comm_amount = communication_amount;
+ simdata->rate = -1.0;
+ simdata->refcount = 1;
+ simdata->sender = NULL;
+ simdata->receiver = NULL;
+ simdata->source = NULL;
- for(i=0;i<host_nb;i++)
- simdata->host_list[i] = host_list[i]->simdata->host;
+ 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;
- return task;
+ 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();
+ e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
+ CHECK_HOST();
+
+ simdata = task->simdata;
+
+ xbt_assert0((!simdata->compute)
+ && (task->simdata->refcount == 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.");
- 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->refcount++;
- xbt_assert0(simdata->host_nb,"This is not a parallel task. Go to hell.");
-
- DEBUG1("Computing on %s", MSG_process_self()->simdata->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);
+ 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;
+ self->simdata->waiting_action = simdata->compute;
SIMIX_register_action_to_condition(simdata->compute, simdata->cond);
- SIMIX_register_condition_to_action(simdata->compute, simdata->cond);
- SIMIX_cond_wait(simdata->cond, simdata->mutex);
- self->simdata->waiting_task = NULL;
+ 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);
+
+ SIMIX_unregister_action_to_condition(simdata->compute, simdata->cond);
+ self->simdata->waiting_action = NULL;
SIMIX_mutex_unlock(simdata->mutex);
- simdata->using--;
+ simdata->refcount--;
- if(SIMIX_action_get_state(task->simdata->compute) == SURF_ACTION_DONE) {
+ 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) {
+ 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 {
+ 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);
- }
+ MSG_RETURN(MSG_TASK_CANCELLED);
+ }
}
{
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;
+
+#ifdef HAVE_TRACING
+ TRACE_msg_process_sleep_in (MSG_process_self());
+#endif
+
/* create action to sleep */
- act_sleep = SIMIX_action_sleep(SIMIX_process_get_host(proc->simdata->smx_process),nb_sec);
-
+ 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_condition_to_action(act_sleep, cond);
+ proc->simdata->waiting_action = act_sleep;
SIMIX_register_action_to_condition(act_sleep, cond);
- SIMIX_cond_wait(cond,mutex);
+ 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_CPU_OFF) {
+ 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);
- MSG_RETURN(MSG_HOST_FAILURE);
- }
- }
- else {
+#ifdef HAVE_TRACING
+ TRACE_msg_process_sleep_out (MSG_process_self());
+#endif
+ MSG_RETURN(MSG_HOST_FAILURE);
+ }
+ } else {
SIMIX_action_destroy(act_sleep);
+#ifdef HAVE_TRACING
+ TRACE_msg_process_sleep_out (MSG_process_self());
+#endif
MSG_RETURN(MSG_HOST_FAILURE);
}
-
+ SIMIX_action_destroy(act_sleep);
+#ifdef HAVE_TRACING
+ TRACE_msg_process_sleep_out (MSG_process_self());
+#endif
MSG_RETURN(MSG_OK);
}
/** \ingroup msg_gos_functions
- * \brief Return the number of MSG tasks currently running on
- * the host of the current running process.
+ * \brief Listen on \a channel and waits for receiving a task from \a host.
+ *
+ * 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
+ those two condition does not hold, there will be a warning message.
+ * \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.
*/
-static int MSG_get_msgload(void)
+ MSG_error_t
+MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
{
- xbt_die("not implemented yet");
- return 0;
+ return MSG_task_get_ext(task, channel, -1, host);
}
/** \ingroup msg_gos_functions
+ * \brief Listen on a channel and wait for receiving a task.
*
- * \brief Return the last value returned by a MSG function (except
- * MSG_get_errno...).
+ * 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
+ those two condition does not hold, there will be a warning message.
+ * \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 #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_get_errno(void)
+MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
+{
+ return MSG_task_get_with_timeout(task, channel, -1);
+}
+
+/** \ingroup msg_gos_functions
+ * \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
+ 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
+ those two condition does not hold, there will be a warning message.
+ * \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.
+ */
+ MSG_error_t
+MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
+ double max_duration)
+{
+ return MSG_task_get_ext(task, channel, max_duration, NULL);
+}
+
+/** \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.
+ */
+
+ 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);
+}
+
+ MSG_error_t
+MSG_task_receive_from_host(m_task_t * task, const char *alias, m_host_t host)
{
- return PROCESS_GET_ERRNO();
+ 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);
+}
+
+ MSG_error_t
+MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
+ double timeout)
+{
+ return MSG_task_receive_ext(task, alias, timeout, NULL);
+}
+
+ MSG_error_t
+MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
+ m_host_t host)
+{
+ 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();
+
+ /* FIXME: these functions are not tracable */
+
+ /* Prepare the task to send */
+ t_simdata = task->simdata;
+ t_simdata->sender = process;
+ t_simdata->source = MSG_host_self();
+
+ xbt_assert0(t_simdata->refcount == 1,
+ "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
+
+ t_simdata->refcount++;
+ msg_global->sent_msg++;
+ process->simdata->waiting_task = task;
+
+ /* Send it by calling SIMIX network layer */
+
+ /* Kept for semantical compatibility with older implementation */
+ if(mailbox->cond)
+ SIMIX_cond_signal(mailbox->cond);
+
+ return SIMIX_network_isend(mailbox->rdv, t_simdata->message_size, t_simdata->rate,
+ task, sizeof(void*), &t_simdata->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*);
+
+ CHECK_HOST();
+
+ /* FIXME: these functions are not tracable */
+
+ memset(&comm,0,sizeof(comm));
+
+ /* 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));
+
+ /* 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 */
+ return SIMIX_network_irecv(rdv, task, &size);
+}
+
+int MSG_comm_test(msg_comm_t comm) {
+ return SIMIX_network_test(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);
+}
+
+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);
+
+ if(!(comm->src_proc == SIMIX_process_self()))
+ {
+ m_task_t task;
+ task = (m_task_t) SIMIX_communication_get_src_buf(comm);
+ task->simdata->refcount--;
+ }
+
+ /* 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;
+}
+
+
+/* This function is called by a sender and permit to wait for each 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
+ */
+
+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);
+ }
+}
+
+int MSG_comm_waitany(xbt_dynar_t comms) {
+ return SIMIX_network_waitany(comms);
+}
+
+m_task_t MSG_comm_get_task(msg_comm_t comm) {
+ xbt_assert0(comm, "Invalid parameters");
+ return (m_task_t) SIMIX_communication_get_src_buf(comm);
+}
+
+/** \ingroup msg_gos_functions
+ * \brief Put a task on a channel of an host and waits for the end of the
+ * transmission.
+ *
+ * This function is used for describing the behavior of an agent. It
+ * takes three 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().
+ * \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)
+ */
+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);
+}
+
+/** \ingroup msg_gos_functions
+ * \brief Does exactly the same as MSG_task_put but with a bounded transmition
+ * rate.
+ *
+ * \sa MSG_task_put
+ */
+ MSG_error_t
+MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
+ double maxrate)
+{
+ task->simdata->rate = maxrate;
+ return MSG_task_put(task, dest, channel);
+}
+
+/** \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 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. 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 timeout)
+{
+ 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);
+}
+
+MSG_error_t MSG_task_send(m_task_t task, const char *alias)
+{
+ return MSG_task_send_with_timeout(task, alias, -1);
+}
+
+
+ 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);
+}
+
+
+ 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);
+}
+
+int MSG_task_listen(const char *alias)
+{
+ CHECK_HOST();
+
+ return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
+}
+
+/** \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
+ */
+int MSG_task_Iprobe(m_channel_t channel)
+{
+ xbt_assert1((channel >= 0)
+ && (channel < msg_global->max_channel), "Invalid channel %d",
+ channel);
+
+ CHECK_HOST();
+
+ return
+ !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
+ (MSG_host_self(), channel));
+}
+
+/** \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)
+{
+ 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);
+
+}
+
+int MSG_task_listen_from_host(const char *alias, m_host_t host)
+{
+ CHECK_HOST();
+
+ return
+ MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias(alias),
+ host);
+}
+
+/** \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)
+{
+ m_task_t task;
+
+ CHECK_HOST();
+
+ 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;
+
+ 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);
+
+
+ if (PID) {
+ *PID = MSG_process_get_PID(t->simdata->sender);
+ }
+
+ MSG_RETURN(MSG_OK);
+ }
}
