1 /* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "xbt/sysdep.h"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
15 "Logging specific to MSG (gos)");
17 /** \ingroup msg_gos_functions
19 * \brief Return the last value returned by a MSG function (except
22 MSG_error_t MSG_get_errno(void)
24 return PROCESS_GET_ERRNO();
27 /** \ingroup msg_gos_functions
28 * \brief Executes a task and waits for its termination.
30 * This function is used for describing the behavior of an agent. It
31 * takes only one parameter.
32 * \param task a #m_task_t to execute on the location on which the
34 * \return #MSG_FATAL if \a task is not properly initialized and
37 MSG_error_t MSG_task_execute(m_task_t task)
39 simdata_task_t simdata = NULL;
40 m_process_t self = MSG_process_self();
41 e_smx_state_t comp_state;
44 simdata = task->simdata;
46 xbt_assert0(simdata->host_nb == 0,
47 "This is a parallel task. Go to hell.");
50 TRACE_msg_task_execute_start(task);
53 xbt_assert1((!simdata->compute) && (task->simdata->isused == 0),
54 "This task is executed somewhere else. Go fix your code! %d",
55 task->simdata->isused);
57 DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
59 if (simdata->computation_amount == 0) {
61 TRACE_msg_task_execute_end(task);
67 SIMIX_req_host_execute(task->name, SIMIX_host_self(),
68 simdata->computation_amount,
71 SIMIX_req_set_category(simdata->compute, task->category);
74 self->simdata->waiting_action = simdata->compute;
75 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
76 self->simdata->waiting_action = NULL;
80 DEBUG2("Execution task '%s' finished in state %d", task->name, comp_state);
81 if (comp_state == SIMIX_DONE) {
82 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
83 simdata->computation_amount = 0.0;
85 simdata->compute = NULL;
87 TRACE_msg_task_execute_end(task);
90 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
91 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
93 simdata->compute = NULL;
95 TRACE_msg_task_execute_end(task);
97 MSG_RETURN(MSG_HOST_FAILURE);
99 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
100 simdata->comm = NULL;
101 simdata->compute = NULL;
103 TRACE_msg_task_execute_end(task);
105 MSG_RETURN(MSG_TASK_CANCELLED);
109 /** \ingroup m_task_management
110 * \brief Creates a new #m_task_t (a parallel one....).
112 * A constructor for #m_task_t taking six arguments and returning the
113 corresponding object.
114 * \param name a name for the object. It is for user-level information
116 * \param host_nb the number of hosts implied in the parallel task.
117 * \param host_list an array of \p host_nb m_host_t.
118 * \param computation_amount an array of \p host_nb
119 doubles. computation_amount[i] is the total number of operations
120 that have to be performed on host_list[i].
121 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
122 * \param data a pointer to any data may want to attach to the new
123 object. It is for user-level information and can be NULL. It can
124 be retrieved with the function \ref MSG_task_get_data.
126 * \return The new corresponding object.
129 MSG_parallel_task_create(const char *name, int host_nb,
130 const m_host_t * host_list,
131 double *computation_amount,
132 double *communication_amount, void *data)
135 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
136 m_task_t task = xbt_new0(s_m_task_t, 1);
137 task->simdata = simdata;
140 task->name = xbt_strdup(name);
144 simdata->computation_amount = 0;
145 simdata->message_size = 0;
146 simdata->compute = NULL;
147 simdata->comm = NULL;
148 simdata->rate = -1.0;
150 simdata->sender = NULL;
151 simdata->receiver = NULL;
152 simdata->source = NULL;
154 simdata->host_nb = host_nb;
155 simdata->host_list = xbt_new0(smx_host_t, host_nb);
156 simdata->comp_amount = computation_amount;
157 simdata->comm_amount = communication_amount;
159 for (i = 0; i < host_nb; i++)
160 simdata->host_list[i] = host_list[i]->simdata->smx_host;
165 MSG_error_t MSG_parallel_task_execute(m_task_t task)
167 simdata_task_t simdata = NULL;
168 e_smx_state_t comp_state;
169 m_process_t self = MSG_process_self();
172 simdata = task->simdata;
174 xbt_assert0((!simdata->compute)
175 && (task->simdata->isused == 0),
176 "This task is executed somewhere else. Go fix your code!");
178 xbt_assert0(simdata->host_nb,
179 "This is not a parallel task. Go to hell.");
181 DEBUG1("Parallel computing on %s", MSG_process_self()->simdata->m_host->name);
186 SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
188 simdata->comp_amount,
189 simdata->comm_amount, 1.0, -1.0);
190 DEBUG1("Parallel execution action created: %p", simdata->compute);
192 self->simdata->waiting_action = simdata->compute;
193 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
194 self->simdata->waiting_action = NULL;
196 DEBUG2("Finished waiting for execution of action %p, state = %d", simdata->compute, comp_state);
200 if (comp_state == SIMIX_DONE) {
201 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
202 simdata->computation_amount = 0.0;
203 simdata->comm = NULL;
204 simdata->compute = NULL;
206 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
207 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
208 simdata->comm = NULL;
209 simdata->compute = NULL;
210 MSG_RETURN(MSG_HOST_FAILURE);
212 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
213 simdata->comm = NULL;
214 simdata->compute = NULL;
215 MSG_RETURN(MSG_TASK_CANCELLED);
220 /** \ingroup msg_gos_functions
221 * \brief Sleep for the specified number of seconds
223 * Makes the current process sleep until \a time seconds have elapsed.
225 * \param nb_sec a number of second
227 MSG_error_t MSG_process_sleep(double nb_sec)
230 /*m_process_t proc = MSG_process_self();*/
233 TRACE_msg_process_sleep_in(MSG_process_self());
236 /* create action to sleep */
237 state = SIMIX_req_process_sleep(nb_sec);
239 /*proc->simdata->waiting_action = act_sleep;
241 FIXME: check if not setting the waiting_action breaks something on msg
243 proc->simdata->waiting_action = NULL;*/
245 if (state == SIMIX_DONE) {
247 TRACE_msg_process_sleep_out(MSG_process_self());
252 TRACE_msg_process_sleep_out(MSG_process_self());
254 MSG_RETURN(MSG_HOST_FAILURE);
258 /** \ingroup msg_gos_functions
259 * \brief Listen on \a channel and waits for receiving a task from \a host.
261 * It takes three parameters.
262 * \param task a memory location for storing a #m_task_t. It will
263 hold a task when this function will return. Thus \a task should not
264 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
265 those two condition does not hold, there will be a warning message.
266 * \param channel the channel on which the agent should be
267 listening. This value has to be >=0 and < than the maximal
268 number of channels fixed with MSG_set_channel_number().
269 * \param host the host that is to be watched.
270 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
271 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
274 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
276 return MSG_task_get_ext(task, channel, -1, host);
279 /** \ingroup msg_gos_functions
280 * \brief Listen on a channel and wait for receiving a task.
282 * It takes two parameters.
283 * \param task a memory location for storing a #m_task_t. It will
284 hold a task when this function will return. Thus \a task should not
285 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
286 those two condition does not hold, there will be a warning message.
287 * \param channel the channel on which the agent should be
288 listening. This value has to be >=0 and < than the maximal
289 number of channels fixed with MSG_set_channel_number().
290 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
291 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
293 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
295 return MSG_task_get_with_timeout(task, channel, -1);
298 /** \ingroup msg_gos_functions
299 * \brief Listen on a channel and wait for receiving a task with a timeout.
301 * It takes three parameters.
302 * \param task a memory location for storing a #m_task_t. It will
303 hold a task when this function will return. Thus \a task should not
304 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
305 those two condition does not hold, there will be a warning message.
306 * \param channel the channel on which the agent should be
307 listening. This value has to be >=0 and < than the maximal
308 number of channels fixed with MSG_set_channel_number().
309 * \param max_duration the maximum time to wait for a task before giving
310 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
311 will not be modified and will still be
312 equal to \c NULL when returning.
313 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
314 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
317 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
320 return MSG_task_get_ext(task, channel, max_duration, NULL);
323 /** \defgroup msg_gos_functions MSG Operating System Functions
324 * \brief This section describes the functions that can be used
325 * by an agent for handling some task.
329 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
332 xbt_assert1((channel >= 0)
333 && (channel < msg_global->max_channel), "Invalid channel %d",
337 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
338 (MSG_host_self(), channel), task, host,
343 MSG_task_receive_from_host(m_task_t * task, const char *alias,
346 return MSG_task_receive_ext(task, alias, -1, host);
349 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
351 return MSG_task_receive_with_timeout(task, alias, -1);
355 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
358 return MSG_task_receive_ext(task, alias, timeout, NULL);
362 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
366 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
368 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
372 /** \ingroup msg_gos_functions
373 * \brief Sends a task on a mailbox.
375 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
376 * to end the communication.
378 * \param task a #m_task_t to send on another location.
379 * \param alias name of the mailbox to sent the task to
380 * \return the msg_comm_t communication created
382 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
384 simdata_task_t t_simdata = NULL;
385 m_process_t process = MSG_process_self();
386 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
390 /* FIXME: these functions are not traceable */
392 /* Prepare the task to send */
393 t_simdata = task->simdata;
394 t_simdata->sender = process;
395 t_simdata->source = MSG_host_self();
397 xbt_assert0(t_simdata->isused == 0,
398 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
400 t_simdata->isused = 1;
401 msg_global->sent_msg++;
403 /* Send it by calling SIMIX network layer */
404 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
405 comm->task_sent = task;
406 comm->task_received = NULL;
407 comm->status = MSG_OK;
409 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
410 t_simdata->rate, task, sizeof(void *), NULL, NULL, 0);
411 t_simdata->comm = comm->s_comm; /* FIXME: is the field t_simdata->comm still useful? */
416 /** \ingroup msg_gos_functions
417 * \brief Sends a task on a mailbox.
419 * This is a non blocking detached send function.
420 * Think of it as a best effort send. The communication
421 * object will be destroyed by the receiver (if any).
423 * \param task a #m_task_t to send on another location.
424 * \param alias name of the mailbox to sent the task to
426 void MSG_task_dsend(m_task_t task, const char *alias)
428 simdata_task_t t_simdata = NULL;
429 m_process_t process = MSG_process_self();
430 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
434 /* FIXME: these functions are not traceable */
436 /* Prepare the task to send */
437 t_simdata = task->simdata;
438 t_simdata->sender = process;
439 t_simdata->source = MSG_host_self();
441 xbt_assert0(t_simdata->isused == 0,
442 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
444 t_simdata->isused = 1;
445 msg_global->sent_msg++;
447 /* Send it by calling SIMIX network layer */
448 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
449 comm->task_sent = task;
450 comm->task_received = NULL;
451 comm->status = MSG_OK;
452 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
453 t_simdata->rate, task, sizeof(void *), NULL, NULL, 1);
454 /*t_simdata->comm = comm->s_comm; FIXME: is the field t_simdata->comm still useful? */
457 /** \ingroup msg_gos_functions
458 * \brief Starts listening for receiving a task from an asynchronous communication.
460 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
461 * to end the communication.
463 * \param task a memory location for storing a #m_task_t.
464 * \param name of the mailbox to receive the task on
465 * \return the msg_comm_t communication created
467 msg_comm_t MSG_task_irecv(m_task_t *task, const char *alias)
469 smx_rdv_t rdv = MSG_mailbox_get_by_alias(alias);
473 /* FIXME: these functions are not tracable */
476 xbt_assert0(task, "Null pointer for the task storage");
480 ("MSG_task_get() was asked to write in a non empty task struct.");
482 /* Try to receive it by calling SIMIX network layer */
483 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
484 comm->task_sent = NULL;
485 comm->task_received = task;
486 comm->status = MSG_OK;
487 comm->s_comm = SIMIX_req_comm_irecv(rdv, task, NULL, NULL, NULL);
492 /** \ingroup msg_gos_functions
493 * \brief Checks whether a communication is done, and if yes, finalizes it.
494 * \param comm the communication to test
495 * \return TRUE if the communication is finished
496 * (but it may have failed, use MSG_comm_get_status() to know its status)
497 * or FALSE if the communication is not finished yet
498 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
500 int MSG_comm_test(msg_comm_t comm)
505 finished = SIMIX_req_comm_test(comm->s_comm);
508 switch (e.category) {
511 comm->status = MSG_HOST_FAILURE;
516 comm->status = MSG_TRANSFER_FAILURE;
521 comm->status = MSG_TIMEOUT;
534 /** \ingroup msg_gos_functions
535 * \brief This function checks if a communication is finished.
536 * \param comms a vector of communications
537 * \return the position of the finished communication if any
538 * (but it may have failed, use MSG_comm_get_status() to know its status),
539 * or -1 if none is finished
541 int MSG_comm_testany(xbt_dynar_t comms)
544 int finished_index = -1;
546 /* create the equivalent dynar with SIMIX objects */
547 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
550 xbt_dynar_foreach(comms, cursor, comm) {
551 xbt_dynar_push(s_comms, &comm->s_comm);
554 MSG_error_t status = MSG_OK;
556 finished_index = SIMIX_req_comm_testany(s_comms);
559 switch (e.category) {
562 finished_index = e.value;
563 status = MSG_HOST_FAILURE;
567 finished_index = e.value;
568 status = MSG_TRANSFER_FAILURE;
572 finished_index = e.value;
573 status = MSG_TIMEOUT;
581 xbt_dynar_free(&s_comms);
583 if (finished_index != -1) {
584 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
585 /* the communication is finished */
586 comm->status = status;
589 return finished_index;
592 /** \ingroup msg_gos_functions
593 * \brief Destroys a communication.
594 * \param comm the communication to destroy.
596 void MSG_comm_destroy(msg_comm_t comm)
598 if (comm->task_received != NULL
599 && *comm->task_received != NULL
600 && MSG_comm_get_status(comm) == MSG_OK) {
601 (*comm->task_received)->simdata->isused = 0;
604 /* FIXME auto-destroy comms from SIMIX to avoid this request */
605 SIMIX_req_comm_destroy(comm->s_comm);
609 /** \ingroup msg_gos_functions
610 * \brief Wait for the completion of a communication.
612 * It takes two parameters.
613 * \param comm the communication to wait.
614 * \param timeout Wait until the communication terminates or the timeout occurs
615 * \return MSG_error_t
617 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
621 SIMIX_req_comm_wait(comm->s_comm, timeout);
623 if (comm->task_received != NULL) {
624 /* I am the receiver */
625 (*comm->task_received)->simdata->isused = 0;
628 /* FIXME: these functions are not traceable */
631 switch (e.category) {
633 comm->status = MSG_HOST_FAILURE;
636 comm->status = MSG_TRANSFER_FAILURE;
639 comm->status = MSG_TIMEOUT;
650 /** \ingroup msg_gos_functions
651 * \brief This function is called by a sender and permit to wait for each communication
653 * \param comm a vector of communication
654 * \param nb_elem is the size of the comm vector
655 * \param timeout for each call of MSG_comm_wait
657 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
660 for (i = 0; i < nb_elem; i++) {
661 MSG_comm_wait(comm[i], timeout);
665 /** \ingroup msg_gos_functions
666 * \brief This function waits for the first communication finished in a list.
667 * \param comms a vector of communications
668 * \return the position of the first finished communication
669 * (but it may have failed, use MSG_comm_get_status() to know its status)
671 int MSG_comm_waitany(xbt_dynar_t comms)
674 int finished_index = -1;
676 /* create the equivalent dynar with SIMIX objects */
677 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
680 xbt_dynar_foreach(comms, cursor, comm) {
681 xbt_dynar_push(s_comms, &comm->s_comm);
684 MSG_error_t status = MSG_OK;
686 finished_index = SIMIX_req_comm_waitany(s_comms);
689 switch (e.category) {
692 finished_index = e.value;
693 status = MSG_HOST_FAILURE;
697 finished_index = e.value;
698 status = MSG_TRANSFER_FAILURE;
702 finished_index = e.value;
703 status = MSG_TIMEOUT;
712 xbt_assert0(finished_index != -1, "WaitAny returned -1");
713 xbt_dynar_free(&s_comms);
715 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
716 /* the communication is finished */
717 comm->status = status;
719 return finished_index;
723 * \ingroup msg_gos_functions
724 * \brief Returns the error (if any) that occured during a finished communication.
725 * \param comm a finished communication
726 * \return the status of the communication, or MSG_OK if no error occured
727 * during the communication
729 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
734 m_task_t MSG_comm_get_task(msg_comm_t comm)
736 xbt_assert0(comm, "Invalid parameter");
738 return comm->task_received ? *comm->task_received : comm->task_sent;
741 /** \ingroup msg_gos_functions
742 * \brief Put a task on a channel of an host and waits for the end of the
745 * This function is used for describing the behavior of an agent. It
746 * takes three parameter.
747 * \param task a #m_task_t to send on another location. This task
748 will not be usable anymore when the function will return. There is
749 no automatic task duplication and you have to save your parameters
750 before calling this function. Tasks are unique and once it has been
751 sent to another location, you should not access it anymore. You do
752 not need to call MSG_task_destroy() but to avoid using, as an
753 effect of inattention, this task anymore, you definitely should
754 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
755 can be transfered iff it has been correctly created with
757 * \param dest the destination of the message
758 * \param channel the channel on which the agent should put this
759 task. This value has to be >=0 and < than the maximal number of
760 channels fixed with MSG_set_channel_number().
761 * \return #MSG_FATAL if \a task is not properly initialized and
762 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
763 * this function was called was shut down. Returns
764 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
765 * (network failure, dest failure)
767 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
769 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
772 /** \ingroup msg_gos_functions
773 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
779 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
782 task->simdata->rate = maxrate;
783 return MSG_task_put(task, dest, channel);
786 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
787 * host (with a timeout on the waiting of the destination host) and
788 * waits for the end of the transmission.
790 * This function is used for describing the behavior of an agent. It
791 * takes four parameter.
792 * \param task a #m_task_t to send on another location. This task
793 will not be usable anymore when the function will return. There is
794 no automatic task duplication and you have to save your parameters
795 before calling this function. Tasks are unique and once it has been
796 sent to another location, you should not access it anymore. You do
797 not need to call MSG_task_destroy() but to avoid using, as an
798 effect of inattention, this task anymore, you definitely should
799 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
800 can be transfered iff it has been correctly created with
802 * \param dest the destination of the message
803 * \param channel the channel on which the agent should put this
804 task. This value has to be >=0 and < than the maximal number of
805 channels fixed with MSG_set_channel_number().
806 * \param timeout the maximum time to wait for a task before giving
807 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
809 * \return #MSG_FATAL if \a task is not properly initialized and
810 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
811 this function was called was shut down. Returns
812 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
813 (network failure, dest failure, timeout...)
816 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
817 m_channel_t channel, double timeout)
819 xbt_assert1((channel >= 0)
820 && (channel < msg_global->max_channel), "Invalid channel %d",
823 DEBUG1("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
825 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
826 (dest, channel), task, timeout);
829 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
831 DEBUG1("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
832 return MSG_task_send_with_timeout(task, alias, -1);
837 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
839 task->simdata->rate = maxrate;
840 return MSG_task_send(task, alias);
845 MSG_task_send_with_timeout(m_task_t task, const char *alias,
848 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
852 int MSG_task_listen(const char *alias)
856 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
859 /** \ingroup msg_gos_functions
860 * \brief Test whether there is a pending communication on a channel.
862 * It takes one parameter.
863 * \param channel the channel on which the agent should be
864 listening. This value has to be >=0 and < than the maximal
865 number of channels fixed with MSG_set_channel_number().
866 * \return 1 if there is a pending communication and 0 otherwise
868 int MSG_task_Iprobe(m_channel_t channel)
870 xbt_assert1((channel >= 0)
871 && (channel < msg_global->max_channel), "Invalid channel %d",
877 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
878 (MSG_host_self(), channel));
881 /** \ingroup msg_gos_functions
883 * \brief Return the number of tasks waiting to be received on a \a
884 channel and sent by \a host.
886 * It takes two parameters.
887 * \param channel the channel on which the agent should be
888 listening. This value has to be >=0 and < than the maximal
889 number of channels fixed with MSG_set_channel_number().
890 * \param host the host that is to be watched.
891 * \return the number of tasks waiting to be received on \a channel
894 int MSG_task_probe_from_host(int channel, m_host_t host)
896 xbt_assert1((channel >= 0)
897 && (channel < msg_global->max_channel), "Invalid channel %d",
903 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
904 (MSG_host_self(), channel),
909 int MSG_task_listen_from_host(const char *alias, m_host_t host)
914 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
918 /** \ingroup msg_gos_functions
919 * \brief Test whether there is a pending communication on a channel, and who sent it.
921 * It takes one parameter.
922 * \param channel the channel on which the agent should be
923 listening. This value has to be >=0 and < than the maximal
924 number of channels fixed with MSG_set_channel_number().
925 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
927 int MSG_task_probe_from(m_channel_t channel)
933 xbt_assert1((channel >= 0)
934 && (channel < msg_global->max_channel), "Invalid channel %d",
939 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
940 (MSG_host_self(), channel))))
943 return MSG_process_get_PID(task->simdata->sender);
946 int MSG_task_listen_from(const char *alias)
953 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
956 return MSG_process_get_PID(task->simdata->sender);