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. */
7 #include "msg_private.h"
8 #include "msg_mailbox.h"
11 #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_OK if the task was successfully completed, #MSG_TASK_CANCELED
35 * or #MSG_HOST_FAILURE otherwise
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);
66 m_process_t self = SIMIX_process_self();
67 p_simdata = SIMIX_process_self_get_data(self);
70 SIMIX_req_host_execute(task->name, p_simdata->m_host->simdata->smx_host,
71 simdata->computation_amount,
74 SIMIX_req_set_category(simdata->compute, task->category);
77 p_simdata->waiting_action = simdata->compute;
78 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
79 p_simdata->waiting_action = NULL;
83 XBT_DEBUG("Execution task '%s' finished in state %d", task->name, comp_state);
84 if (comp_state == SIMIX_DONE) {
85 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
86 simdata->computation_amount = 0.0;
88 simdata->compute = NULL;
90 TRACE_msg_task_execute_end(task);
93 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
94 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
96 simdata->compute = NULL;
98 TRACE_msg_task_execute_end(task);
100 MSG_RETURN(MSG_HOST_FAILURE);
102 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
103 simdata->comm = NULL;
104 simdata->compute = NULL;
106 TRACE_msg_task_execute_end(task);
108 MSG_RETURN(MSG_TASK_CANCELED);
112 /** \ingroup m_task_management
113 * \brief Creates a new #m_task_t (a parallel one....).
115 * A constructor for #m_task_t taking six arguments and returning the
116 corresponding object.
117 * \param name a name for the object. It is for user-level information
119 * \param host_nb the number of hosts implied in the parallel task.
120 * \param host_list an array of \p host_nb m_host_t.
121 * \param computation_amount an array of \p host_nb
122 doubles. computation_amount[i] is the total number of operations
123 that have to be performed on host_list[i].
124 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
125 * \param data a pointer to any data may want to attach to the new
126 object. It is for user-level information and can be NULL. It can
127 be retrieved with the function \ref MSG_task_get_data.
129 * \return The new corresponding object.
132 MSG_parallel_task_create(const char *name, int host_nb,
133 const m_host_t * host_list,
134 double *computation_amount,
135 double *communication_amount, void *data)
138 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
139 m_task_t task = xbt_new0(s_m_task_t, 1);
140 task->simdata = simdata;
143 task->name = xbt_strdup(name);
147 simdata->computation_amount = 0;
148 simdata->message_size = 0;
149 simdata->compute = NULL;
150 simdata->comm = NULL;
151 simdata->rate = -1.0;
153 simdata->sender = NULL;
154 simdata->receiver = NULL;
155 simdata->source = NULL;
157 simdata->host_nb = host_nb;
158 simdata->host_list = xbt_new0(smx_host_t, host_nb);
159 simdata->comp_amount = computation_amount;
160 simdata->comm_amount = communication_amount;
162 for (i = 0; i < host_nb; i++)
163 simdata->host_list[i] = host_list[i]->simdata->smx_host;
168 MSG_error_t MSG_parallel_task_execute(m_task_t task)
170 simdata_task_t simdata = NULL;
171 e_smx_state_t comp_state;
172 simdata_process_t p_simdata;
175 simdata = task->simdata;
176 p_simdata = SIMIX_process_self_get_data(SIMIX_process_self());
178 xbt_assert((!simdata->compute)
179 && (task->simdata->isused == 0),
180 "This task is executed somewhere else. Go fix your code!");
182 xbt_assert(simdata->host_nb,
183 "This is not a parallel task. Go to hell.");
185 XBT_DEBUG("Parallel computing on %s", p_simdata->m_host->name);
190 SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
192 simdata->comp_amount,
193 simdata->comm_amount, 1.0, -1.0);
194 XBT_DEBUG("Parallel execution action created: %p", simdata->compute);
196 p_simdata->waiting_action = simdata->compute;
197 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
198 p_simdata->waiting_action = NULL;
200 XBT_DEBUG("Finished waiting for execution of action %p, state = %d", simdata->compute, comp_state);
204 if (comp_state == SIMIX_DONE) {
205 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
206 simdata->computation_amount = 0.0;
207 simdata->comm = NULL;
208 simdata->compute = NULL;
210 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
211 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
212 simdata->comm = NULL;
213 simdata->compute = NULL;
214 MSG_RETURN(MSG_HOST_FAILURE);
216 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
217 simdata->comm = NULL;
218 simdata->compute = NULL;
219 MSG_RETURN(MSG_TASK_CANCELED);
224 /** \ingroup msg_gos_functions
225 * \brief Sleep for the specified number of seconds
227 * Makes the current process sleep until \a time seconds have elapsed.
229 * \param nb_sec a number of second
231 MSG_error_t MSG_process_sleep(double nb_sec)
234 /*m_process_t proc = MSG_process_self();*/
237 TRACE_msg_process_sleep_in(MSG_process_self());
240 /* create action to sleep */
241 state = SIMIX_req_process_sleep(nb_sec);
243 /*proc->simdata->waiting_action = act_sleep;
245 FIXME: check if not setting the waiting_action breaks something on msg
247 proc->simdata->waiting_action = NULL;*/
249 if (state == SIMIX_DONE) {
251 TRACE_msg_process_sleep_out(MSG_process_self());
256 TRACE_msg_process_sleep_out(MSG_process_self());
258 MSG_RETURN(MSG_HOST_FAILURE);
262 /** \ingroup msg_gos_functions
263 * \brief Listen on \a channel and waits for receiving a task from \a host.
265 * It takes three parameters.
266 * \param task a memory location for storing a #m_task_t. It will
267 hold a task when this function will return. Thus \a task should not
268 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
269 those two condition does not hold, there will be a warning message.
270 * \param channel the channel on which the agent should be
271 listening. This value has to be >=0 and < than the maximal
272 number of channels fixed with MSG_set_channel_number().
273 * \param host the host that is to be watched.
274 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
275 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
278 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
280 return MSG_task_get_ext(task, channel, -1, host);
283 /** \ingroup msg_gos_functions
284 * \brief Listen on a channel and wait for receiving a task.
286 * It takes two parameters.
287 * \param task a memory location for storing a #m_task_t. It will
288 hold a task when this function will return. Thus \a task should not
289 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
290 those two condition does not hold, there will be a warning message.
291 * \param channel the channel on which the agent should be
292 listening. This value has to be >=0 and < than the maximal
293 number of channels fixed with MSG_set_channel_number().
294 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
295 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
297 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
299 return MSG_task_get_with_timeout(task, channel, -1);
302 /** \ingroup msg_gos_functions
303 * \brief Listen on a channel and wait for receiving a task with a timeout.
305 * It takes three parameters.
306 * \param task a memory location for storing a #m_task_t. It will
307 hold a task when this function will return. Thus \a task should not
308 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
309 those two condition does not hold, there will be a warning message.
310 * \param channel the channel on which the agent should be
311 listening. This value has to be >=0 and < than the maximal
312 number of channels fixed with MSG_set_channel_number().
313 * \param max_duration the maximum time to wait for a task before giving
314 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
315 will not be modified and will still be
316 equal to \c NULL when returning.
317 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
318 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
321 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
324 return MSG_task_get_ext(task, channel, max_duration, NULL);
327 /** \defgroup msg_gos_functions MSG Operating System Functions
328 * \brief This section describes the functions that can be used
329 * by an agent for handling some task.
333 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
336 xbt_assert((channel >= 0)
337 && (channel < msg_global->max_channel), "Invalid channel %d",
341 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
342 (MSG_host_self(), channel), task, host,
347 MSG_task_receive_from_host(m_task_t * task, const char *alias,
350 return MSG_task_receive_ext(task, alias, -1, host);
353 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
355 return MSG_task_receive_with_timeout(task, alias, -1);
359 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
362 return MSG_task_receive_ext(task, alias, timeout, NULL);
366 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
370 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
372 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
376 /** \ingroup msg_gos_functions
377 * \brief Sends a task on a mailbox.
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 * \return the msg_comm_t communication created
386 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
388 return MSG_task_isend_with_matching(task,alias,NULL,NULL);
391 /** \ingroup msg_gos_functions
392 * \brief Sends a task on a mailbox, with support for matching requests
394 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
395 * to end the communication.
397 * \param task a #m_task_t to send on another location.
398 * \param alias name of the mailbox to sent the task to
399 * \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
400 * \param match_data user provided data passed to match_fun
401 * \return the msg_comm_t communication created
403 XBT_INLINE msg_comm_t MSG_task_isend_with_matching(m_task_t task, const char *alias,
404 int (*match_fun)(void*,void*),
407 simdata_task_t t_simdata = NULL;
408 m_process_t process = MSG_process_self();
409 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
413 /* FIXME: these functions are not traceable */
415 /* Prepare the task to send */
416 t_simdata = task->simdata;
417 t_simdata->sender = process;
418 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
420 xbt_assert(t_simdata->isused == 0,
421 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
423 t_simdata->isused = 1;
424 msg_global->sent_msg++;
426 /* Send it by calling SIMIX network layer */
427 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
428 comm->task_sent = task;
429 comm->task_received = NULL;
430 comm->status = MSG_OK;
432 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
433 t_simdata->rate, task, sizeof(void *), match_fun, match_data, 0);
434 t_simdata->comm = comm->s_comm; /* FIXME: is the field t_simdata->comm still useful? */
439 /** \ingroup msg_gos_functions
440 * \brief Sends a task on a mailbox.
442 * This is a non blocking detached send function.
443 * Think of it as a best effort send. Keep in mind that the third parameter
444 * is only called if the communication fails. If the communication does work,
445 * it is responsibility of the receiver code to free anything related to
446 * the task, as usual. More details on this can be obtained on
447 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
448 * in the SimGrid-user mailing list archive.
450 * \param task a #m_task_t to send on another location.
451 * \param alias name of the mailbox to sent the task to
452 * \param cleanup a function to destroy the task if the
453 * communication fails (if NULL, MSG_task_destroy() will
454 * be used by default)
456 void MSG_task_dsend(m_task_t task, const char *alias, void_f_pvoid_t cleanup)
458 simdata_task_t t_simdata = NULL;
459 m_process_t process = MSG_process_self();
460 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
464 if (cleanup == NULL) {
465 cleanup = (void_f_pvoid_t) MSG_task_destroy;
468 /* FIXME: these functions are not traceable */
470 /* Prepare the task to send */
471 t_simdata = task->simdata;
472 t_simdata->sender = process;
473 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
475 xbt_assert(t_simdata->isused == 0,
476 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
478 t_simdata->isused = 1;
479 msg_global->sent_msg++;
481 /* Send it by calling SIMIX network layer */
482 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
483 t_simdata->rate, task, sizeof(void *), NULL, cleanup, 1);
486 /** \ingroup msg_gos_functions
487 * \brief Starts listening for receiving a task from an asynchronous communication.
489 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
490 * to end the communication.
492 * \param task a memory location for storing a #m_task_t.
493 * \param name of the mailbox to receive the task on
494 * \return the msg_comm_t communication created
496 msg_comm_t MSG_task_irecv(m_task_t *task, const char *name)
498 smx_rdv_t rdv = MSG_mailbox_get_by_alias(name);
502 /* FIXME: these functions are not tracable */
505 xbt_assert(task, "Null pointer for the task storage");
509 ("MSG_task_get() was asked to write in a non empty task struct.");
511 /* Try to receive it by calling SIMIX network layer */
512 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
513 comm->task_sent = NULL;
514 comm->task_received = task;
515 comm->status = MSG_OK;
516 comm->s_comm = SIMIX_req_comm_irecv(rdv, task, NULL, NULL, NULL);
521 /** \ingroup msg_gos_functions
522 * \brief Checks whether a communication is done, and if yes, finalizes it.
523 * \param comm the communication to test
524 * \return TRUE if the communication is finished
525 * (but it may have failed, use MSG_comm_get_status() to know its status)
526 * or FALSE if the communication is not finished yet
527 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
529 int MSG_comm_test(msg_comm_t comm)
534 finished = SIMIX_req_comm_test(comm->s_comm);
537 switch (e.category) {
540 comm->status = MSG_HOST_FAILURE;
545 comm->status = MSG_TRANSFER_FAILURE;
550 comm->status = MSG_TIMEOUT;
563 /** \ingroup msg_gos_functions
564 * \brief This function checks if a communication is finished.
565 * \param comms a vector of communications
566 * \return the position of the finished communication if any
567 * (but it may have failed, use MSG_comm_get_status() to know its status),
568 * or -1 if none is finished
570 int MSG_comm_testany(xbt_dynar_t comms)
573 int finished_index = -1;
575 /* create the equivalent dynar with SIMIX objects */
576 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
579 xbt_dynar_foreach(comms, cursor, comm) {
580 xbt_dynar_push(s_comms, &comm->s_comm);
583 MSG_error_t status = MSG_OK;
585 finished_index = SIMIX_req_comm_testany(s_comms);
588 switch (e.category) {
591 finished_index = e.value;
592 status = MSG_HOST_FAILURE;
596 finished_index = e.value;
597 status = MSG_TRANSFER_FAILURE;
601 finished_index = e.value;
602 status = MSG_TIMEOUT;
610 xbt_dynar_free(&s_comms);
612 if (finished_index != -1) {
613 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
614 /* the communication is finished */
615 comm->status = status;
618 return finished_index;
621 /** \ingroup msg_gos_functions
622 * \brief Destroys a communication.
623 * \param comm the communication to destroy.
625 void MSG_comm_destroy(msg_comm_t comm)
627 if (comm->task_received != NULL
628 && *comm->task_received != NULL
629 && MSG_comm_get_status(comm) == MSG_OK) {
630 (*comm->task_received)->simdata->isused = 0;
636 /** \ingroup msg_gos_functions
637 * \brief Wait for the completion of a communication.
639 * It takes two parameters.
640 * \param comm the communication to wait.
641 * \param timeout Wait until the communication terminates or the timeout occurs
642 * \return MSG_error_t
644 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
648 SIMIX_req_comm_wait(comm->s_comm, timeout);
650 if (comm->task_received != NULL) {
651 /* I am the receiver */
652 (*comm->task_received)->simdata->isused = 0;
655 /* FIXME: these functions are not traceable */
658 switch (e.category) {
660 comm->status = MSG_HOST_FAILURE;
663 comm->status = MSG_TRANSFER_FAILURE;
666 comm->status = MSG_TIMEOUT;
677 /** \ingroup msg_gos_functions
678 * \brief This function is called by a sender and permit to wait for each communication
680 * \param comm a vector of communication
681 * \param nb_elem is the size of the comm vector
682 * \param timeout for each call of MSG_comm_wait
684 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
687 for (i = 0; i < nb_elem; i++) {
688 MSG_comm_wait(comm[i], timeout);
692 /** \ingroup msg_gos_functions
693 * \brief This function waits for the first communication finished in a list.
694 * \param comms a vector of communications
695 * \return the position of the first finished communication
696 * (but it may have failed, use MSG_comm_get_status() to know its status)
698 int MSG_comm_waitany(xbt_dynar_t comms)
701 int finished_index = -1;
703 /* create the equivalent dynar with SIMIX objects */
704 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
707 xbt_dynar_foreach(comms, cursor, comm) {
708 xbt_dynar_push(s_comms, &comm->s_comm);
711 MSG_error_t status = MSG_OK;
713 finished_index = SIMIX_req_comm_waitany(s_comms);
716 switch (e.category) {
719 finished_index = e.value;
720 status = MSG_HOST_FAILURE;
724 finished_index = e.value;
725 status = MSG_TRANSFER_FAILURE;
729 finished_index = e.value;
730 status = MSG_TIMEOUT;
739 xbt_assert(finished_index != -1, "WaitAny returned -1");
740 xbt_dynar_free(&s_comms);
742 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
743 /* the communication is finished */
744 comm->status = status;
746 return finished_index;
750 * \ingroup msg_gos_functions
751 * \brief Returns the error (if any) that occured during a finished communication.
752 * \param comm a finished communication
753 * \return the status of the communication, or MSG_OK if no error occured
754 * during the communication
756 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
761 m_task_t MSG_comm_get_task(msg_comm_t comm)
763 xbt_assert(comm, "Invalid parameter");
765 return comm->task_received ? *comm->task_received : comm->task_sent;
768 /** \ingroup msg_gos_functions
769 * \brief Put a task on a channel of an host and waits for the end of the
772 * This function is used for describing the behavior of an agent. It
773 * takes three parameter.
774 * \param task a #m_task_t to send on another location. This task
775 will not be usable anymore when the function will return. There is
776 no automatic task duplication and you have to save your parameters
777 before calling this function. Tasks are unique and once it has been
778 sent to another location, you should not access it anymore. You do
779 not need to call MSG_task_destroy() but to avoid using, as an
780 effect of inattention, this task anymore, you definitely should
781 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
782 can be transfered iff it has been correctly created with
784 * \param dest the destination of the message
785 * \param channel the channel on which the agent should put this
786 task. This value has to be >=0 and < than the maximal number of
787 channels fixed with MSG_set_channel_number().
788 * \return #MSG_FATAL if \a task is not properly initialized and
789 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
790 * this function was called was shut down. Returns
791 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
792 * (network failure, dest failure)
794 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
796 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
799 /** \ingroup msg_gos_functions
800 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
806 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
809 task->simdata->rate = maxrate;
810 return MSG_task_put(task, dest, channel);
813 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
814 * host (with a timeout on the waiting of the destination host) and
815 * waits for the end of the transmission.
817 * This function is used for describing the behavior of an agent. It
818 * takes four parameter.
819 * \param task a #m_task_t to send on another location. This task
820 will not be usable anymore when the function will return. There is
821 no automatic task duplication and you have to save your parameters
822 before calling this function. Tasks are unique and once it has been
823 sent to another location, you should not access it anymore. You do
824 not need to call MSG_task_destroy() but to avoid using, as an
825 effect of inattention, this task anymore, you definitely should
826 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
827 can be transfered iff it has been correctly created with
829 * \param dest the destination of the message
830 * \param channel the channel on which the agent should put this
831 task. This value has to be >=0 and < than the maximal number of
832 channels fixed with MSG_set_channel_number().
833 * \param timeout the maximum time to wait for a task before giving
834 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
836 * \return #MSG_FATAL if \a task is not properly initialized and
837 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
838 this function was called was shut down. Returns
839 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
840 (network failure, dest failure, timeout...)
843 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
844 m_channel_t channel, double timeout)
846 xbt_assert((channel >= 0)
847 && (channel < msg_global->max_channel), "Invalid channel %d",
850 XBT_DEBUG("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
852 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
853 (dest, channel), task, timeout);
856 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
858 XBT_DEBUG("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
859 return MSG_task_send_with_timeout(task, alias, -1);
864 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
866 task->simdata->rate = maxrate;
867 return MSG_task_send(task, alias);
872 MSG_task_send_with_timeout(m_task_t task, const char *alias,
875 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
879 int MSG_task_listen(const char *alias)
883 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
886 /** \ingroup msg_gos_functions
887 * \brief Test whether there is a pending communication on a channel.
889 * It takes one parameter.
890 * \param channel the channel on which the agent should be
891 listening. This value has to be >=0 and < than the maximal
892 number of channels fixed with MSG_set_channel_number().
893 * \return 1 if there is a pending communication and 0 otherwise
895 int MSG_task_Iprobe(m_channel_t channel)
897 xbt_assert((channel >= 0)
898 && (channel < msg_global->max_channel), "Invalid channel %d",
904 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
905 (MSG_host_self(), channel));
908 /** \ingroup msg_gos_functions
910 * \brief Return the number of tasks waiting to be received on a \a
911 channel and sent by \a host.
913 * It takes two parameters.
914 * \param channel the channel on which the agent should be
915 listening. This value has to be >=0 and < than the maximal
916 number of channels fixed with MSG_set_channel_number().
917 * \param host the host that is to be watched.
918 * \return the number of tasks waiting to be received on \a channel
921 int MSG_task_probe_from_host(int channel, m_host_t host)
923 xbt_assert((channel >= 0)
924 && (channel < msg_global->max_channel), "Invalid channel %d",
930 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
931 (MSG_host_self(), channel),
936 int MSG_task_listen_from_host(const char *alias, m_host_t host)
941 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
945 /** \ingroup msg_gos_functions
946 * \brief Test whether there is a pending communication on a channel, and who sent it.
948 * It takes one parameter.
949 * \param channel the channel on which the agent should be
950 listening. This value has to be >=0 and < than the maximal
951 number of channels fixed with MSG_set_channel_number().
952 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
954 int MSG_task_probe_from(m_channel_t channel)
960 xbt_assert((channel >= 0)
961 && (channel < msg_global->max_channel), "Invalid channel %d",
966 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
967 (MSG_host_self(), channel))))
970 return MSG_process_get_PID(task->simdata->sender);
973 int MSG_task_listen_from(const char *alias)
980 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
983 return MSG_process_get_PID(task->simdata->sender);