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 simdata_process_t p_simdata;
41 e_smx_state_t comp_state;
44 simdata = task->simdata;
46 xbt_assert(simdata->host_nb == 0,
47 "This is a parallel task. Go to hell.");
50 TRACE_msg_task_execute_start(task);
53 xbt_assert((!simdata->compute) && (task->simdata->isused == 0),
54 "This task is executed somewhere else. Go fix your code! %d",
55 task->simdata->isused);
57 XBT_DEBUG("Computing on %s", MSG_process_get_name(MSG_process_self()));
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 p_simdata = SIMIX_process_self_get_data();
75 p_simdata->waiting_action = simdata->compute;
76 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
77 p_simdata->waiting_action = NULL;
81 XBT_DEBUG("Execution task '%s' finished in state %d", task->name, comp_state);
82 if (comp_state == SIMIX_DONE) {
83 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
84 simdata->computation_amount = 0.0;
86 simdata->compute = NULL;
88 TRACE_msg_task_execute_end(task);
91 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
92 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
94 simdata->compute = NULL;
96 TRACE_msg_task_execute_end(task);
98 MSG_RETURN(MSG_HOST_FAILURE);
100 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
101 simdata->comm = NULL;
102 simdata->compute = NULL;
104 TRACE_msg_task_execute_end(task);
106 MSG_RETURN(MSG_TASK_CANCELLED);
110 /** \ingroup m_task_management
111 * \brief Creates a new #m_task_t (a parallel one....).
113 * A constructor for #m_task_t taking six arguments and returning the
114 corresponding object.
115 * \param name a name for the object. It is for user-level information
117 * \param host_nb the number of hosts implied in the parallel task.
118 * \param host_list an array of \p host_nb m_host_t.
119 * \param computation_amount an array of \p host_nb
120 doubles. computation_amount[i] is the total number of operations
121 that have to be performed on host_list[i].
122 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
123 * \param data a pointer to any data may want to attach to the new
124 object. It is for user-level information and can be NULL. It can
125 be retrieved with the function \ref MSG_task_get_data.
127 * \return The new corresponding object.
130 MSG_parallel_task_create(const char *name, int host_nb,
131 const m_host_t * host_list,
132 double *computation_amount,
133 double *communication_amount, void *data)
136 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
137 m_task_t task = xbt_new0(s_m_task_t, 1);
138 task->simdata = simdata;
141 task->name = xbt_strdup(name);
145 simdata->computation_amount = 0;
146 simdata->message_size = 0;
147 simdata->compute = NULL;
148 simdata->comm = NULL;
149 simdata->rate = -1.0;
151 simdata->sender = NULL;
152 simdata->receiver = NULL;
153 simdata->source = NULL;
155 simdata->host_nb = host_nb;
156 simdata->host_list = xbt_new0(smx_host_t, host_nb);
157 simdata->comp_amount = computation_amount;
158 simdata->comm_amount = communication_amount;
160 for (i = 0; i < host_nb; i++)
161 simdata->host_list[i] = host_list[i]->simdata->smx_host;
166 MSG_error_t MSG_parallel_task_execute(m_task_t task)
168 simdata_task_t simdata = NULL;
169 e_smx_state_t comp_state;
170 simdata_process_t p_simdata;
173 simdata = task->simdata;
174 p_simdata = SIMIX_process_self_get_data();
176 xbt_assert((!simdata->compute)
177 && (task->simdata->isused == 0),
178 "This task is executed somewhere else. Go fix your code!");
180 xbt_assert(simdata->host_nb,
181 "This is not a parallel task. Go to hell.");
183 XBT_DEBUG("Parallel computing on %s", p_simdata->m_host->name);
188 SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
190 simdata->comp_amount,
191 simdata->comm_amount, 1.0, -1.0);
192 XBT_DEBUG("Parallel execution action created: %p", simdata->compute);
194 p_simdata->waiting_action = simdata->compute;
195 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
196 p_simdata->waiting_action = NULL;
198 XBT_DEBUG("Finished waiting for execution of action %p, state = %d", simdata->compute, comp_state);
202 if (comp_state == SIMIX_DONE) {
203 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
204 simdata->computation_amount = 0.0;
205 simdata->comm = NULL;
206 simdata->compute = NULL;
208 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
209 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
210 simdata->comm = NULL;
211 simdata->compute = NULL;
212 MSG_RETURN(MSG_HOST_FAILURE);
214 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
215 simdata->comm = NULL;
216 simdata->compute = NULL;
217 MSG_RETURN(MSG_TASK_CANCELLED);
222 /** \ingroup msg_gos_functions
223 * \brief Sleep for the specified number of seconds
225 * Makes the current process sleep until \a time seconds have elapsed.
227 * \param nb_sec a number of second
229 MSG_error_t MSG_process_sleep(double nb_sec)
232 /*m_process_t proc = MSG_process_self();*/
235 TRACE_msg_process_sleep_in(MSG_process_self());
238 /* create action to sleep */
239 state = SIMIX_req_process_sleep(nb_sec);
241 /*proc->simdata->waiting_action = act_sleep;
243 FIXME: check if not setting the waiting_action breaks something on msg
245 proc->simdata->waiting_action = NULL;*/
247 if (state == SIMIX_DONE) {
249 TRACE_msg_process_sleep_out(MSG_process_self());
254 TRACE_msg_process_sleep_out(MSG_process_self());
256 MSG_RETURN(MSG_HOST_FAILURE);
260 /** \ingroup msg_gos_functions
261 * \brief Listen on \a channel and waits for receiving a task from \a host.
263 * It takes three parameters.
264 * \param task a memory location for storing a #m_task_t. It will
265 hold a task when this function will return. Thus \a task should not
266 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
267 those two condition does not hold, there will be a warning message.
268 * \param channel the channel on which the agent should be
269 listening. This value has to be >=0 and < than the maximal
270 number of channels fixed with MSG_set_channel_number().
271 * \param host the host that is to be watched.
272 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
273 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
276 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
278 return MSG_task_get_ext(task, channel, -1, host);
281 /** \ingroup msg_gos_functions
282 * \brief Listen on a channel and wait for receiving a task.
284 * It takes two parameters.
285 * \param task a memory location for storing a #m_task_t. It will
286 hold a task when this function will return. Thus \a task should not
287 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
288 those two condition does not hold, there will be a warning message.
289 * \param channel the channel on which the agent should be
290 listening. This value has to be >=0 and < than the maximal
291 number of channels fixed with MSG_set_channel_number().
292 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
293 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
295 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
297 return MSG_task_get_with_timeout(task, channel, -1);
300 /** \ingroup msg_gos_functions
301 * \brief Listen on a channel and wait for receiving a task with a timeout.
303 * It takes three parameters.
304 * \param task a memory location for storing a #m_task_t. It will
305 hold a task when this function will return. Thus \a task should not
306 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
307 those two condition does not hold, there will be a warning message.
308 * \param channel the channel on which the agent should be
309 listening. This value has to be >=0 and < than the maximal
310 number of channels fixed with MSG_set_channel_number().
311 * \param max_duration the maximum time to wait for a task before giving
312 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
313 will not be modified and will still be
314 equal to \c NULL when returning.
315 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
316 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
319 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
322 return MSG_task_get_ext(task, channel, max_duration, NULL);
325 /** \defgroup msg_gos_functions MSG Operating System Functions
326 * \brief This section describes the functions that can be used
327 * by an agent for handling some task.
331 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
334 xbt_assert((channel >= 0)
335 && (channel < msg_global->max_channel), "Invalid channel %d",
339 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
340 (MSG_host_self(), channel), task, host,
345 MSG_task_receive_from_host(m_task_t * task, const char *alias,
348 return MSG_task_receive_ext(task, alias, -1, host);
351 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
353 return MSG_task_receive_with_timeout(task, alias, -1);
357 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
360 return MSG_task_receive_ext(task, alias, timeout, NULL);
364 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
368 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
370 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
374 /** \ingroup msg_gos_functions
375 * \brief Sends a task on a mailbox.
377 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
378 * to end the communication.
380 * \param task a #m_task_t to send on another location.
381 * \param alias name of the mailbox to sent the task to
382 * \return the msg_comm_t communication created
384 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
386 return MSG_task_isend_with_matching(task,alias,NULL,NULL);
388 /** \ingroup msg_gos_functions
389 * \brief Sends a task on a mailbox, with support for matching requests
391 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
392 * to end the communication.
394 * \param task a #m_task_t to send on another location.
395 * \param alias name of the mailbox to sent the task to
396 * \param match_fun boolean function taking the #match_data provided by sender (here), and the one of the receiver (if any) and returning whether they match
397 * \param match_data user provided data passed to match_fun
398 * \return the msg_comm_t communication created
400 XBT_INLINE msg_comm_t MSG_task_isend_with_matching(m_task_t task, const char *alias,
401 int (*match_fun)(void*,void*),
404 simdata_task_t t_simdata = NULL;
405 m_process_t process = MSG_process_self();
406 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
410 /* FIXME: these functions are not traceable */
412 /* Prepare the task to send */
413 t_simdata = task->simdata;
414 t_simdata->sender = process;
415 t_simdata->source = MSG_host_self();
417 xbt_assert(t_simdata->isused == 0,
418 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
420 t_simdata->isused = 1;
421 msg_global->sent_msg++;
423 /* Send it by calling SIMIX network layer */
424 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
425 comm->task_sent = task;
426 comm->task_received = NULL;
427 comm->status = MSG_OK;
429 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
430 t_simdata->rate, task, sizeof(void *), match_fun, match_data, 0);
431 t_simdata->comm = comm->s_comm; /* FIXME: is the field t_simdata->comm still useful? */
436 /** \ingroup msg_gos_functions
437 * \brief Sends a task on a mailbox.
439 * This is a non blocking detached send function.
440 * Think of it as a best effort send. The task should
441 * be destroyed by the receiver.
443 * \param task a #m_task_t to send on another location.
444 * \param alias name of the mailbox to sent the task to
445 * \param cleanup a function to destroy the task if the
446 * communication fails (if NULL, MSG_task_destroy() will
447 * be used by default)
449 void MSG_task_dsend(m_task_t task, const char *alias, void_f_pvoid_t cleanup)
451 simdata_task_t t_simdata = NULL;
452 m_process_t process = MSG_process_self();
453 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
457 if (cleanup == NULL) {
458 cleanup = (void_f_pvoid_t) MSG_task_destroy;
461 /* FIXME: these functions are not traceable */
463 /* Prepare the task to send */
464 t_simdata = task->simdata;
465 t_simdata->sender = process;
466 t_simdata->source = MSG_host_self();
468 xbt_assert(t_simdata->isused == 0,
469 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
471 t_simdata->isused = 1;
472 msg_global->sent_msg++;
474 /* Send it by calling SIMIX network layer */
475 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
476 t_simdata->rate, task, sizeof(void *), NULL, cleanup, 1);
479 /** \ingroup msg_gos_functions
480 * \brief Starts listening for receiving a task from an asynchronous communication.
482 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
483 * to end the communication.
485 * \param task a memory location for storing a #m_task_t.
486 * \param name of the mailbox to receive the task on
487 * \return the msg_comm_t communication created
489 msg_comm_t MSG_task_irecv(m_task_t *task, const char *name)
491 smx_rdv_t rdv = MSG_mailbox_get_by_alias(name);
495 /* FIXME: these functions are not tracable */
498 xbt_assert(task, "Null pointer for the task storage");
502 ("MSG_task_get() was asked to write in a non empty task struct.");
504 /* Try to receive it by calling SIMIX network layer */
505 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
506 comm->task_sent = NULL;
507 comm->task_received = task;
508 comm->status = MSG_OK;
509 comm->s_comm = SIMIX_req_comm_irecv(rdv, task, NULL, NULL, NULL);
514 /** \ingroup msg_gos_functions
515 * \brief Checks whether a communication is done, and if yes, finalizes it.
516 * \param comm the communication to test
517 * \return TRUE if the communication is finished
518 * (but it may have failed, use MSG_comm_get_status() to know its status)
519 * or FALSE if the communication is not finished yet
520 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
522 int MSG_comm_test(msg_comm_t comm)
527 finished = SIMIX_req_comm_test(comm->s_comm);
530 switch (e.category) {
533 comm->status = MSG_HOST_FAILURE;
538 comm->status = MSG_TRANSFER_FAILURE;
543 comm->status = MSG_TIMEOUT;
556 /** \ingroup msg_gos_functions
557 * \brief This function checks if a communication is finished.
558 * \param comms a vector of communications
559 * \return the position of the finished communication if any
560 * (but it may have failed, use MSG_comm_get_status() to know its status),
561 * or -1 if none is finished
563 int MSG_comm_testany(xbt_dynar_t comms)
566 int finished_index = -1;
568 /* create the equivalent dynar with SIMIX objects */
569 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
572 xbt_dynar_foreach(comms, cursor, comm) {
573 xbt_dynar_push(s_comms, &comm->s_comm);
576 MSG_error_t status = MSG_OK;
578 finished_index = SIMIX_req_comm_testany(s_comms);
581 switch (e.category) {
584 finished_index = e.value;
585 status = MSG_HOST_FAILURE;
589 finished_index = e.value;
590 status = MSG_TRANSFER_FAILURE;
594 finished_index = e.value;
595 status = MSG_TIMEOUT;
603 xbt_dynar_free(&s_comms);
605 if (finished_index != -1) {
606 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
607 /* the communication is finished */
608 comm->status = status;
611 return finished_index;
614 /** \ingroup msg_gos_functions
615 * \brief Destroys a communication.
616 * \param comm the communication to destroy.
618 void MSG_comm_destroy(msg_comm_t comm)
620 if (comm->task_received != NULL
621 && *comm->task_received != NULL
622 && MSG_comm_get_status(comm) == MSG_OK) {
623 (*comm->task_received)->simdata->isused = 0;
629 /** \ingroup msg_gos_functions
630 * \brief Wait for the completion of a communication.
632 * It takes two parameters.
633 * \param comm the communication to wait.
634 * \param timeout Wait until the communication terminates or the timeout occurs
635 * \return MSG_error_t
637 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
641 SIMIX_req_comm_wait(comm->s_comm, timeout);
643 if (comm->task_received != NULL) {
644 /* I am the receiver */
645 (*comm->task_received)->simdata->isused = 0;
648 /* FIXME: these functions are not traceable */
651 switch (e.category) {
653 comm->status = MSG_HOST_FAILURE;
656 comm->status = MSG_TRANSFER_FAILURE;
659 comm->status = MSG_TIMEOUT;
670 /** \ingroup msg_gos_functions
671 * \brief This function is called by a sender and permit to wait for each communication
673 * \param comm a vector of communication
674 * \param nb_elem is the size of the comm vector
675 * \param timeout for each call of MSG_comm_wait
677 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
680 for (i = 0; i < nb_elem; i++) {
681 MSG_comm_wait(comm[i], timeout);
685 /** \ingroup msg_gos_functions
686 * \brief This function waits for the first communication finished in a list.
687 * \param comms a vector of communications
688 * \return the position of the first finished communication
689 * (but it may have failed, use MSG_comm_get_status() to know its status)
691 int MSG_comm_waitany(xbt_dynar_t comms)
694 int finished_index = -1;
696 /* create the equivalent dynar with SIMIX objects */
697 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
700 xbt_dynar_foreach(comms, cursor, comm) {
701 xbt_dynar_push(s_comms, &comm->s_comm);
704 MSG_error_t status = MSG_OK;
706 finished_index = SIMIX_req_comm_waitany(s_comms);
709 switch (e.category) {
712 finished_index = e.value;
713 status = MSG_HOST_FAILURE;
717 finished_index = e.value;
718 status = MSG_TRANSFER_FAILURE;
722 finished_index = e.value;
723 status = MSG_TIMEOUT;
732 xbt_assert(finished_index != -1, "WaitAny returned -1");
733 xbt_dynar_free(&s_comms);
735 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
736 /* the communication is finished */
737 comm->status = status;
739 return finished_index;
743 * \ingroup msg_gos_functions
744 * \brief Returns the error (if any) that occured during a finished communication.
745 * \param comm a finished communication
746 * \return the status of the communication, or MSG_OK if no error occured
747 * during the communication
749 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
754 m_task_t MSG_comm_get_task(msg_comm_t comm)
756 xbt_assert(comm, "Invalid parameter");
758 return comm->task_received ? *comm->task_received : comm->task_sent;
761 /** \ingroup msg_gos_functions
762 * \brief Put a task on a channel of an host and waits for the end of the
765 * This function is used for describing the behavior of an agent. It
766 * takes three parameter.
767 * \param task a #m_task_t to send on another location. This task
768 will not be usable anymore when the function will return. There is
769 no automatic task duplication and you have to save your parameters
770 before calling this function. Tasks are unique and once it has been
771 sent to another location, you should not access it anymore. You do
772 not need to call MSG_task_destroy() but to avoid using, as an
773 effect of inattention, this task anymore, you definitely should
774 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
775 can be transfered iff it has been correctly created with
777 * \param dest the destination of the message
778 * \param channel the channel on which the agent should put this
779 task. This value has to be >=0 and < than the maximal number of
780 channels fixed with MSG_set_channel_number().
781 * \return #MSG_FATAL if \a task is not properly initialized and
782 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
783 * this function was called was shut down. Returns
784 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
785 * (network failure, dest failure)
787 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
789 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
792 /** \ingroup msg_gos_functions
793 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
799 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
802 task->simdata->rate = maxrate;
803 return MSG_task_put(task, dest, channel);
806 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
807 * host (with a timeout on the waiting of the destination host) and
808 * waits for the end of the transmission.
810 * This function is used for describing the behavior of an agent. It
811 * takes four parameter.
812 * \param task a #m_task_t to send on another location. This task
813 will not be usable anymore when the function will return. There is
814 no automatic task duplication and you have to save your parameters
815 before calling this function. Tasks are unique and once it has been
816 sent to another location, you should not access it anymore. You do
817 not need to call MSG_task_destroy() but to avoid using, as an
818 effect of inattention, this task anymore, you definitely should
819 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
820 can be transfered iff it has been correctly created with
822 * \param dest the destination of the message
823 * \param channel the channel on which the agent should put this
824 task. This value has to be >=0 and < than the maximal number of
825 channels fixed with MSG_set_channel_number().
826 * \param timeout the maximum time to wait for a task before giving
827 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
829 * \return #MSG_FATAL if \a task is not properly initialized and
830 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
831 this function was called was shut down. Returns
832 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
833 (network failure, dest failure, timeout...)
836 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
837 m_channel_t channel, double timeout)
839 xbt_assert((channel >= 0)
840 && (channel < msg_global->max_channel), "Invalid channel %d",
843 XBT_DEBUG("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
845 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
846 (dest, channel), task, timeout);
849 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
851 XBT_DEBUG("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
852 return MSG_task_send_with_timeout(task, alias, -1);
857 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
859 task->simdata->rate = maxrate;
860 return MSG_task_send(task, alias);
865 MSG_task_send_with_timeout(m_task_t task, const char *alias,
868 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
872 int MSG_task_listen(const char *alias)
876 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
879 /** \ingroup msg_gos_functions
880 * \brief Test whether there is a pending communication on a channel.
882 * It takes one parameter.
883 * \param channel the channel on which the agent should be
884 listening. This value has to be >=0 and < than the maximal
885 number of channels fixed with MSG_set_channel_number().
886 * \return 1 if there is a pending communication and 0 otherwise
888 int MSG_task_Iprobe(m_channel_t channel)
890 xbt_assert((channel >= 0)
891 && (channel < msg_global->max_channel), "Invalid channel %d",
897 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
898 (MSG_host_self(), channel));
901 /** \ingroup msg_gos_functions
903 * \brief Return the number of tasks waiting to be received on a \a
904 channel and sent by \a host.
906 * It takes two parameters.
907 * \param channel the channel on which the agent should be
908 listening. This value has to be >=0 and < than the maximal
909 number of channels fixed with MSG_set_channel_number().
910 * \param host the host that is to be watched.
911 * \return the number of tasks waiting to be received on \a channel
914 int MSG_task_probe_from_host(int channel, m_host_t host)
916 xbt_assert((channel >= 0)
917 && (channel < msg_global->max_channel), "Invalid channel %d",
923 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
924 (MSG_host_self(), channel),
929 int MSG_task_listen_from_host(const char *alias, m_host_t host)
934 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
938 /** \ingroup msg_gos_functions
939 * \brief Test whether there is a pending communication on a channel, and who sent it.
941 * It takes one parameter.
942 * \param channel the channel on which the agent should be
943 listening. This value has to be >=0 and < than the maximal
944 number of channels fixed with MSG_set_channel_number().
945 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
947 int MSG_task_probe_from(m_channel_t channel)
953 xbt_assert((channel >= 0)
954 && (channel < msg_global->max_channel), "Invalid channel %d",
959 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
960 (MSG_host_self(), channel))))
963 return MSG_process_get_PID(task->simdata->sender);
966 int MSG_task_listen_from(const char *alias)
973 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
976 return MSG_process_get_PID(task->simdata->sender);