1 /* Copyright (c) 2004-2011. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "msg_private.h"
7 #include "msg_mailbox.h"
10 #include "xbt/sysdep.h"
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
13 "Logging specific to MSG (gos)");
15 /** \ingroup msg_gos_functions
16 * \brief Executes a task and waits for its termination.
18 * This function is used for describing the behavior of an agent. It
19 * takes only one parameter.
20 * \param task a #m_task_t to execute on the location on which the
22 * \return #MSG_OK if the task was successfully completed, #MSG_TASK_CANCELED
23 * or #MSG_HOST_FAILURE otherwise
25 MSG_error_t MSG_task_execute(m_task_t task)
27 simdata_task_t simdata = NULL;
28 simdata_process_t p_simdata;
29 e_smx_state_t comp_state;
32 simdata = task->simdata;
34 xbt_assert(simdata->host_nb == 0,
35 "This is a parallel task. Go to hell.");
38 TRACE_msg_task_execute_start(task);
41 xbt_assert((!simdata->compute) && (task->simdata->isused == 0),
42 "This task is executed somewhere else. Go fix your code! %d",
43 task->simdata->isused);
45 XBT_DEBUG("Computing on %s", MSG_process_get_name(MSG_process_self()));
47 if (simdata->computation_amount == 0) {
49 TRACE_msg_task_execute_end(task);
54 m_process_t self = SIMIX_process_self();
55 p_simdata = SIMIX_process_self_get_data(self);
58 SIMIX_req_host_execute(task->name, p_simdata->m_host->simdata->smx_host,
59 simdata->computation_amount,
62 SIMIX_req_set_category(simdata->compute, task->category);
65 p_simdata->waiting_action = simdata->compute;
66 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
67 p_simdata->waiting_action = NULL;
71 XBT_DEBUG("Execution task '%s' finished in state %d", task->name, comp_state);
72 if (comp_state == SIMIX_DONE) {
73 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
74 simdata->computation_amount = 0.0;
76 simdata->compute = NULL;
78 TRACE_msg_task_execute_end(task);
81 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
82 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
84 simdata->compute = NULL;
86 TRACE_msg_task_execute_end(task);
88 MSG_RETURN(MSG_HOST_FAILURE);
90 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
92 simdata->compute = NULL;
94 TRACE_msg_task_execute_end(task);
96 MSG_RETURN(MSG_TASK_CANCELED);
100 /** \ingroup m_task_management
101 * \brief Creates a new #m_task_t (a parallel one....).
103 * A constructor for #m_task_t taking six arguments and returning the
104 corresponding object.
105 * \param name a name for the object. It is for user-level information
107 * \param host_nb the number of hosts implied in the parallel task.
108 * \param host_list an array of \p host_nb m_host_t.
109 * \param computation_amount an array of \p host_nb
110 doubles. computation_amount[i] is the total number of operations
111 that have to be performed on host_list[i].
112 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
113 * \param data a pointer to any data may want to attach to the new
114 object. It is for user-level information and can be NULL. It can
115 be retrieved with the function \ref MSG_task_get_data.
117 * \return The new corresponding object.
120 MSG_parallel_task_create(const char *name, int host_nb,
121 const m_host_t * host_list,
122 double *computation_amount,
123 double *communication_amount, void *data)
126 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
127 m_task_t task = xbt_new0(s_m_task_t, 1);
128 task->simdata = simdata;
131 task->name = xbt_strdup(name);
135 simdata->computation_amount = 0;
136 simdata->message_size = 0;
137 simdata->compute = NULL;
138 simdata->comm = NULL;
139 simdata->rate = -1.0;
141 simdata->sender = NULL;
142 simdata->receiver = NULL;
143 simdata->source = NULL;
145 simdata->host_nb = host_nb;
146 simdata->host_list = xbt_new0(smx_host_t, host_nb);
147 simdata->comp_amount = computation_amount;
148 simdata->comm_amount = communication_amount;
150 for (i = 0; i < host_nb; i++)
151 simdata->host_list[i] = host_list[i]->simdata->smx_host;
156 MSG_error_t MSG_parallel_task_execute(m_task_t task)
158 simdata_task_t simdata = NULL;
159 e_smx_state_t comp_state;
160 simdata_process_t p_simdata;
163 simdata = task->simdata;
164 p_simdata = SIMIX_process_self_get_data(SIMIX_process_self());
166 xbt_assert((!simdata->compute)
167 && (task->simdata->isused == 0),
168 "This task is executed somewhere else. Go fix your code!");
170 xbt_assert(simdata->host_nb,
171 "This is not a parallel task. Go to hell.");
173 XBT_DEBUG("Parallel computing on %s", p_simdata->m_host->name);
178 SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
180 simdata->comp_amount,
181 simdata->comm_amount, 1.0, -1.0);
182 XBT_DEBUG("Parallel execution action created: %p", simdata->compute);
184 p_simdata->waiting_action = simdata->compute;
185 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
186 p_simdata->waiting_action = NULL;
188 XBT_DEBUG("Finished waiting for execution of action %p, state = %d", simdata->compute, comp_state);
192 if (comp_state == SIMIX_DONE) {
193 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
194 simdata->computation_amount = 0.0;
195 simdata->comm = NULL;
196 simdata->compute = NULL;
198 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
199 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
200 simdata->comm = NULL;
201 simdata->compute = NULL;
202 MSG_RETURN(MSG_HOST_FAILURE);
204 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
205 simdata->comm = NULL;
206 simdata->compute = NULL;
207 MSG_RETURN(MSG_TASK_CANCELED);
212 /** \ingroup msg_gos_functions
213 * \brief Sleep for the specified number of seconds
215 * Makes the current process sleep until \a time seconds have elapsed.
217 * \param nb_sec a number of second
219 MSG_error_t MSG_process_sleep(double nb_sec)
222 /*m_process_t proc = MSG_process_self();*/
225 TRACE_msg_process_sleep_in(MSG_process_self());
228 /* create action to sleep */
229 state = SIMIX_req_process_sleep(nb_sec);
231 /*proc->simdata->waiting_action = act_sleep;
233 FIXME: check if not setting the waiting_action breaks something on msg
235 proc->simdata->waiting_action = NULL;*/
237 if (state == SIMIX_DONE) {
239 TRACE_msg_process_sleep_out(MSG_process_self());
244 TRACE_msg_process_sleep_out(MSG_process_self());
246 MSG_RETURN(MSG_HOST_FAILURE);
250 /** \ingroup msg_gos_functions
251 * \brief Listen on \a channel and waits for receiving a task from \a host.
253 * It takes three parameters.
254 * \param task a memory location for storing a #m_task_t. It will
255 hold a task when this function will return. Thus \a task should not
256 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
257 those two condition does not hold, there will be a warning message.
258 * \param channel the channel on which the agent should be
259 listening. This value has to be >=0 and < than the maximal
260 number of channels fixed with MSG_set_channel_number().
261 * \param host the host that is to be watched.
262 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
265 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
267 return MSG_task_get_ext(task, channel, -1, host);
270 /** \ingroup msg_gos_functions
271 * \brief Listen on a channel and wait for receiving a task.
273 * It takes two parameters.
274 * \param task a memory location for storing a #m_task_t. It will
275 hold a task when this function will return. Thus \a task should not
276 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
277 those two condition does not hold, there will be a warning message.
278 * \param channel the channel on which the agent should be
279 listening. This value has to be >=0 and < than the maximal
280 number of channels fixed with MSG_set_channel_number().
281 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
283 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
285 return MSG_task_get_with_timeout(task, channel, -1);
288 /** \ingroup msg_gos_functions
289 * \brief Listen on a channel and wait for receiving a task with a timeout.
291 * It takes three parameters.
292 * \param task a memory location for storing a #m_task_t. It will
293 hold a task when this function will return. Thus \a task should not
294 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
295 those two condition does not hold, there will be a warning message.
296 * \param channel the channel on which the agent should be
297 listening. This value has to be >=0 and < than the maximal
298 number of channels fixed with MSG_set_channel_number().
299 * \param max_duration the maximum time to wait for a task before giving
300 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
301 will not be modified and will still be
302 equal to \c NULL when returning.
303 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
306 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
309 return MSG_task_get_ext(task, channel, max_duration, NULL);
312 /** \defgroup msg_gos_functions MSG Operating System Functions
313 * \brief This section describes the functions that can be used
314 * by an agent for handling some task.
318 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
321 xbt_assert((channel >= 0)
322 && (channel < msg_global->max_channel), "Invalid channel %d",
326 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
327 (MSG_host_self(), channel), task, host,
332 MSG_task_receive_from_host(m_task_t * task, const char *alias,
335 return MSG_task_receive_ext(task, alias, -1, host);
338 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
340 return MSG_task_receive_with_timeout(task, alias, -1);
344 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
347 return MSG_task_receive_ext(task, alias, timeout, NULL);
351 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
355 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
357 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
361 /** \ingroup msg_gos_functions
362 * \brief Sends a task on a mailbox.
364 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
365 * to end the communication.
367 * \param task a #m_task_t to send on another location.
368 * \param alias name of the mailbox to sent the task to
369 * \return the msg_comm_t communication created
371 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
373 return MSG_task_isend_with_matching(task,alias,NULL,NULL);
376 /** \ingroup msg_gos_functions
377 * \brief Sends a task on a mailbox, with support for matching requests
379 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
380 * to end the communication.
382 * \param task a #m_task_t to send on another location.
383 * \param alias name of the mailbox to sent the task to
384 * \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
385 * \param match_data user provided data passed to match_fun
386 * \return the msg_comm_t communication created
388 XBT_INLINE msg_comm_t MSG_task_isend_with_matching(m_task_t task, const char *alias,
389 int (*match_fun)(void*,void*),
392 simdata_task_t t_simdata = NULL;
393 m_process_t process = MSG_process_self();
394 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
398 /* FIXME: these functions are not traceable */
400 /* Prepare the task to send */
401 t_simdata = task->simdata;
402 t_simdata->sender = process;
403 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
405 xbt_assert(t_simdata->isused == 0,
406 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
408 t_simdata->isused = 1;
409 msg_global->sent_msg++;
411 /* Send it by calling SIMIX network layer */
412 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
413 comm->task_sent = task;
414 comm->task_received = NULL;
415 comm->status = MSG_OK;
417 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
418 t_simdata->rate, task, sizeof(void *), match_fun, NULL, match_data, 0);
419 t_simdata->comm = comm->s_comm; /* FIXME: is the field t_simdata->comm still useful? */
424 /** \ingroup msg_gos_functions
425 * \brief Sends a task on a mailbox.
427 * This is a non blocking detached send function.
428 * Think of it as a best effort send. Keep in mind that the third parameter
429 * is only called if the communication fails. If the communication does work,
430 * it is responsibility of the receiver code to free anything related to
431 * the task, as usual. More details on this can be obtained on
432 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
433 * in the SimGrid-user mailing list archive.
435 * \param task a #m_task_t to send on another location.
436 * \param alias name of the mailbox to sent the task to
437 * \param cleanup a function to destroy the task if the
438 * communication fails, e.g. MSG_task_destroy
439 * (if NULL, no function will be called)
441 void MSG_task_dsend(m_task_t task, const char *alias, void_f_pvoid_t cleanup)
443 simdata_task_t t_simdata = NULL;
444 m_process_t process = MSG_process_self();
445 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
449 /* FIXME: these functions are not traceable */
451 /* Prepare the task to send */
452 t_simdata = task->simdata;
453 t_simdata->sender = process;
454 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
456 xbt_assert(t_simdata->isused == 0,
457 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
459 t_simdata->isused = 1;
460 msg_global->sent_msg++;
462 /* Send it by calling SIMIX network layer */
463 smx_action_t comm = SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
464 t_simdata->rate, task, sizeof(void *), NULL, cleanup, NULL, 1);
465 t_simdata->comm = comm;
468 /** \ingroup msg_gos_functions
469 * \brief Starts listening for receiving a task from an asynchronous communication.
471 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
472 * to end the communication.
474 * \param task a memory location for storing a #m_task_t.
475 * \param name of the mailbox to receive the task on
476 * \return the msg_comm_t communication created
478 msg_comm_t MSG_task_irecv(m_task_t *task, const char *name)
480 smx_rdv_t rdv = MSG_mailbox_get_by_alias(name);
484 /* FIXME: these functions are not tracable */
487 xbt_assert(task, "Null pointer for the task storage");
491 ("MSG_task_irecv() was asked to write in a non empty task struct.");
493 /* Try to receive it by calling SIMIX network layer */
494 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
495 comm->task_sent = NULL;
496 comm->task_received = task;
497 comm->status = MSG_OK;
498 comm->s_comm = SIMIX_req_comm_irecv(rdv, task, NULL, NULL, NULL);
503 /** \ingroup msg_gos_functions
504 * \brief Checks whether a communication is done, and if yes, finalizes it.
505 * \param comm the communication to test
506 * \return TRUE if the communication is finished
507 * (but it may have failed, use MSG_comm_get_status() to know its status)
508 * or FALSE if the communication is not finished yet
509 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
511 int MSG_comm_test(msg_comm_t comm)
516 finished = SIMIX_req_comm_test(comm->s_comm);
518 if (finished && comm->task_received != NULL) {
519 /* I am the receiver */
520 (*comm->task_received)->simdata->isused = 0;
524 switch (e.category) {
527 comm->status = MSG_HOST_FAILURE;
532 comm->status = MSG_TRANSFER_FAILURE;
537 comm->status = MSG_TIMEOUT;
550 /** \ingroup msg_gos_functions
551 * \brief This function checks if a communication is finished.
552 * \param comms a vector of communications
553 * \return the position of the finished communication if any
554 * (but it may have failed, use MSG_comm_get_status() to know its status),
555 * or -1 if none is finished
557 int MSG_comm_testany(xbt_dynar_t comms)
560 int finished_index = -1;
562 /* create the equivalent dynar with SIMIX objects */
563 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
566 xbt_dynar_foreach(comms, cursor, comm) {
567 xbt_dynar_push(s_comms, &comm->s_comm);
570 MSG_error_t status = MSG_OK;
572 finished_index = SIMIX_req_comm_testany(s_comms);
575 switch (e.category) {
578 finished_index = e.value;
579 status = MSG_HOST_FAILURE;
583 finished_index = e.value;
584 status = MSG_TRANSFER_FAILURE;
588 finished_index = e.value;
589 status = MSG_TIMEOUT;
597 xbt_dynar_free(&s_comms);
599 if (finished_index != -1) {
600 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
601 /* the communication is finished */
602 comm->status = status;
604 if (status == MSG_OK && comm->task_received != NULL) {
605 /* I am the receiver */
606 (*comm->task_received)->simdata->isused = 0;
610 return finished_index;
613 /** \ingroup msg_gos_functions
614 * \brief Destroys a communication.
615 * \param comm the communication to destroy.
617 void MSG_comm_destroy(msg_comm_t comm)
622 /** \ingroup msg_gos_functions
623 * \brief Wait for the completion of a communication.
625 * It takes two parameters.
626 * \param comm the communication to wait.
627 * \param timeout Wait until the communication terminates or the timeout occurs
628 * \return MSG_error_t
630 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
634 SIMIX_req_comm_wait(comm->s_comm, timeout);
636 if (comm->task_received != NULL) {
637 /* I am the receiver */
638 (*comm->task_received)->simdata->isused = 0;
641 /* FIXME: these functions are not traceable */
644 switch (e.category) {
646 comm->status = MSG_HOST_FAILURE;
649 comm->status = MSG_TRANSFER_FAILURE;
652 comm->status = MSG_TIMEOUT;
663 /** \ingroup msg_gos_functions
664 * \brief This function is called by a sender and permit to wait for each communication
666 * \param comm a vector of communication
667 * \param nb_elem is the size of the comm vector
668 * \param timeout for each call of MSG_comm_wait
670 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
673 for (i = 0; i < nb_elem; i++) {
674 MSG_comm_wait(comm[i], timeout);
678 /** \ingroup msg_gos_functions
679 * \brief This function waits for the first communication finished in a list.
680 * \param comms a vector of communications
681 * \return the position of the first finished communication
682 * (but it may have failed, use MSG_comm_get_status() to know its status)
684 int MSG_comm_waitany(xbt_dynar_t comms)
687 int finished_index = -1;
689 /* create the equivalent dynar with SIMIX objects */
690 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
693 xbt_dynar_foreach(comms, cursor, comm) {
694 xbt_dynar_push(s_comms, &comm->s_comm);
697 MSG_error_t status = MSG_OK;
699 finished_index = SIMIX_req_comm_waitany(s_comms);
702 switch (e.category) {
705 finished_index = e.value;
706 status = MSG_HOST_FAILURE;
710 finished_index = e.value;
711 status = MSG_TRANSFER_FAILURE;
715 finished_index = e.value;
716 status = MSG_TIMEOUT;
725 xbt_assert(finished_index != -1, "WaitAny returned -1");
726 xbt_dynar_free(&s_comms);
728 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
729 /* the communication is finished */
730 comm->status = status;
732 if (comm->task_received != NULL) {
733 /* I am the receiver */
734 (*comm->task_received)->simdata->isused = 0;
737 return finished_index;
741 * \ingroup msg_gos_functions
742 * \brief Returns the error (if any) that occured during a finished communication.
743 * \param comm a finished communication
744 * \return the status of the communication, or MSG_OK if no error occured
745 * during the communication
747 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
752 m_task_t MSG_comm_get_task(msg_comm_t comm)
754 xbt_assert(comm, "Invalid parameter");
756 return comm->task_received ? *comm->task_received : comm->task_sent;
760 * \brief This function is called by SIMIX to copy the data of a comm.
761 * \param comm the comm
762 * \param buff the data copied
763 * \param buff_size size of the buffer
765 void MSG_comm_copy_data_from_SIMIX(smx_action_t comm, void* buff, size_t buff_size) {
768 SIMIX_comm_copy_pointer_callback(comm, buff, buff_size);
770 // notify the user callback if any
771 if (msg_global->task_copy_callback) {
772 m_task_t task = buff;
773 msg_global->task_copy_callback(task,
774 SIMIX_req_comm_get_src_proc(comm), SIMIX_req_comm_get_dst_proc(comm));
778 /** \ingroup msg_gos_functions
779 * \brief Put a task on a channel of an host and waits for the end of the
782 * This function is used for describing the behavior of an agent. It
783 * takes three parameter.
784 * \param task a #m_task_t to send on another location. This task
785 will not be usable anymore when the function will return. There is
786 no automatic task duplication and you have to save your parameters
787 before calling this function. Tasks are unique and once it has been
788 sent to another location, you should not access it anymore. You do
789 not need to call MSG_task_destroy() but to avoid using, as an
790 effect of inattention, this task anymore, you definitely should
791 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
792 can be transfered iff it has been correctly created with
794 * \param dest the destination of the message
795 * \param channel the channel on which the agent should put this
796 task. This value has to be >=0 and < than the maximal number of
797 channels fixed with MSG_set_channel_number().
798 * \return #MSG_HOST_FAILURE if the host on which
799 * this function was called was shut down,
800 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
801 * (network failure, dest failure) or #MSG_OK if it succeeded.
803 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
805 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
808 /** \ingroup msg_gos_functions
809 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
815 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
818 task->simdata->rate = maxrate;
819 return MSG_task_put(task, dest, channel);
822 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
823 * host (with a timeout on the waiting of the destination host) and
824 * waits for the end of the transmission.
826 * This function is used for describing the behavior of an agent. It
827 * takes four parameter.
828 * \param task a #m_task_t to send on another location. This task
829 will not be usable anymore when the function will return. There is
830 no automatic task duplication and you have to save your parameters
831 before calling this function. Tasks are unique and once it has been
832 sent to another location, you should not access it anymore. You do
833 not need to call MSG_task_destroy() but to avoid using, as an
834 effect of inattention, this task anymore, you definitely should
835 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
836 can be transfered iff it has been correctly created with
838 * \param dest the destination of the message
839 * \param channel the channel on which the agent should put this
840 task. This value has to be >=0 and < than the maximal number of
841 channels fixed with MSG_set_channel_number().
842 * \param timeout the maximum time to wait for a task before giving
843 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
845 * \return #MSG_HOST_FAILURE if the host on which
846 this function was called was shut down,
847 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
848 (network failure, dest failure, timeout...) or #MSG_OK if the communication succeeded.
851 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
852 m_channel_t channel, double timeout)
854 xbt_assert((channel >= 0)
855 && (channel < msg_global->max_channel), "Invalid channel %d",
858 XBT_DEBUG("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
860 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
861 (dest, channel), task, timeout);
864 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
866 XBT_DEBUG("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
867 return MSG_task_send_with_timeout(task, alias, -1);
872 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
874 task->simdata->rate = maxrate;
875 return MSG_task_send(task, alias);
880 MSG_task_send_with_timeout(m_task_t task, const char *alias,
883 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
887 int MSG_task_listen(const char *alias)
891 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
894 /** \ingroup msg_gos_functions
895 * \brief Test whether there is a pending communication on a channel.
897 * It takes one parameter.
898 * \param channel the channel on which the agent should be
899 listening. This value has to be >=0 and < than the maximal
900 number of channels fixed with MSG_set_channel_number().
901 * \return 1 if there is a pending communication and 0 otherwise
903 int MSG_task_Iprobe(m_channel_t channel)
905 xbt_assert((channel >= 0)
906 && (channel < msg_global->max_channel), "Invalid channel %d",
912 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
913 (MSG_host_self(), channel));
916 /** \ingroup msg_gos_functions
918 * \brief Return the number of tasks waiting to be received on a \a
919 channel and sent by \a host.
921 * It takes two parameters.
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 * \param host the host that is to be watched.
926 * \return the number of tasks waiting to be received on \a channel
929 int MSG_task_probe_from_host(int channel, m_host_t host)
931 xbt_assert((channel >= 0)
932 && (channel < msg_global->max_channel), "Invalid channel %d",
938 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
939 (MSG_host_self(), channel),
944 int MSG_task_listen_from_host(const char *alias, m_host_t host)
949 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
953 /** \ingroup msg_gos_functions
954 * \brief Test whether there is a pending communication on a channel, and who sent it.
956 * It takes one parameter.
957 * \param channel the channel on which the agent should be
958 listening. This value has to be >=0 and < than the maximal
959 number of channels fixed with MSG_set_channel_number().
960 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
962 int MSG_task_probe_from(m_channel_t channel)
968 xbt_assert((channel >= 0)
969 && (channel < msg_global->max_channel), "Invalid channel %d",
974 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
975 (MSG_host_self(), channel))))
978 return MSG_process_get_PID(task->simdata->sender);
981 int MSG_task_listen_from(const char *alias)
988 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
991 return MSG_process_get_PID(task->simdata->sender);
994 #ifdef MSG_USE_DEPRECATED
995 /** \ingroup msg_gos_functions
997 * \brief Return the last value returned by a MSG function (except
1000 MSG_error_t MSG_get_errno(void)
1002 return PROCESS_GET_ERRNO();