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
18 * \brief Executes a task and waits for its termination.
20 * This function is used for describing the behavior of an agent. It
21 * takes only one parameter.
22 * \param task a #m_task_t to execute on the location on which the
24 * \return #MSG_OK if the task was successfully completed, #MSG_TASK_CANCELED
25 * or #MSG_HOST_FAILURE otherwise
27 MSG_error_t MSG_task_execute(m_task_t task)
29 simdata_task_t simdata = NULL;
30 simdata_process_t p_simdata;
31 e_smx_state_t comp_state;
34 simdata = task->simdata;
36 xbt_assert(simdata->host_nb == 0,
37 "This is a parallel task. Go to hell.");
40 TRACE_msg_task_execute_start(task);
43 xbt_assert((!simdata->compute) && (task->simdata->isused == 0),
44 "This task is executed somewhere else. Go fix your code! %d",
45 task->simdata->isused);
47 XBT_DEBUG("Computing on %s", MSG_process_get_name(MSG_process_self()));
49 if (simdata->computation_amount == 0) {
51 TRACE_msg_task_execute_end(task);
56 m_process_t self = SIMIX_process_self();
57 p_simdata = SIMIX_process_self_get_data(self);
60 SIMIX_req_host_execute(task->name, p_simdata->m_host->simdata->smx_host,
61 simdata->computation_amount,
64 SIMIX_req_set_category(simdata->compute, task->category);
67 p_simdata->waiting_action = simdata->compute;
68 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
69 p_simdata->waiting_action = NULL;
73 XBT_DEBUG("Execution task '%s' finished in state %d", task->name, comp_state);
74 if (comp_state == SIMIX_DONE) {
75 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
76 simdata->computation_amount = 0.0;
78 simdata->compute = NULL;
80 TRACE_msg_task_execute_end(task);
83 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
84 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
86 simdata->compute = NULL;
88 TRACE_msg_task_execute_end(task);
90 MSG_RETURN(MSG_HOST_FAILURE);
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_TASK_CANCELED);
102 /** \ingroup m_task_management
103 * \brief Creates a new #m_task_t (a parallel one....).
105 * A constructor for #m_task_t taking six arguments and returning the
106 corresponding object.
107 * \param name a name for the object. It is for user-level information
109 * \param host_nb the number of hosts implied in the parallel task.
110 * \param host_list an array of \p host_nb m_host_t.
111 * \param computation_amount an array of \p host_nb
112 doubles. computation_amount[i] is the total number of operations
113 that have to be performed on host_list[i].
114 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
115 * \param data a pointer to any data may want to attach to the new
116 object. It is for user-level information and can be NULL. It can
117 be retrieved with the function \ref MSG_task_get_data.
119 * \return The new corresponding object.
122 MSG_parallel_task_create(const char *name, int host_nb,
123 const m_host_t * host_list,
124 double *computation_amount,
125 double *communication_amount, void *data)
128 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
129 m_task_t task = xbt_new0(s_m_task_t, 1);
130 task->simdata = simdata;
133 task->name = xbt_strdup(name);
137 simdata->computation_amount = 0;
138 simdata->message_size = 0;
139 simdata->compute = NULL;
140 simdata->comm = NULL;
141 simdata->rate = -1.0;
143 simdata->sender = NULL;
144 simdata->receiver = NULL;
145 simdata->source = NULL;
147 simdata->host_nb = host_nb;
148 simdata->host_list = xbt_new0(smx_host_t, host_nb);
149 simdata->comp_amount = computation_amount;
150 simdata->comm_amount = communication_amount;
152 for (i = 0; i < host_nb; i++)
153 simdata->host_list[i] = host_list[i]->simdata->smx_host;
158 MSG_error_t MSG_parallel_task_execute(m_task_t task)
160 simdata_task_t simdata = NULL;
161 e_smx_state_t comp_state;
162 simdata_process_t p_simdata;
165 simdata = task->simdata;
166 p_simdata = SIMIX_process_self_get_data(SIMIX_process_self());
168 xbt_assert((!simdata->compute)
169 && (task->simdata->isused == 0),
170 "This task is executed somewhere else. Go fix your code!");
172 xbt_assert(simdata->host_nb,
173 "This is not a parallel task. Go to hell.");
175 XBT_DEBUG("Parallel computing on %s", p_simdata->m_host->name);
180 SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
182 simdata->comp_amount,
183 simdata->comm_amount, 1.0, -1.0);
184 XBT_DEBUG("Parallel execution action created: %p", simdata->compute);
186 p_simdata->waiting_action = simdata->compute;
187 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
188 p_simdata->waiting_action = NULL;
190 XBT_DEBUG("Finished waiting for execution of action %p, state = %d", simdata->compute, comp_state);
194 if (comp_state == SIMIX_DONE) {
195 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
196 simdata->computation_amount = 0.0;
197 simdata->comm = NULL;
198 simdata->compute = NULL;
200 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
201 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
202 simdata->comm = NULL;
203 simdata->compute = NULL;
204 MSG_RETURN(MSG_HOST_FAILURE);
206 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
207 simdata->comm = NULL;
208 simdata->compute = NULL;
209 MSG_RETURN(MSG_TASK_CANCELED);
214 /** \ingroup msg_gos_functions
215 * \brief Sleep for the specified number of seconds
217 * Makes the current process sleep until \a time seconds have elapsed.
219 * \param nb_sec a number of second
221 MSG_error_t MSG_process_sleep(double nb_sec)
224 /*m_process_t proc = MSG_process_self();*/
227 TRACE_msg_process_sleep_in(MSG_process_self());
230 /* create action to sleep */
231 state = SIMIX_req_process_sleep(nb_sec);
233 /*proc->simdata->waiting_action = act_sleep;
235 FIXME: check if not setting the waiting_action breaks something on msg
237 proc->simdata->waiting_action = NULL;*/
239 if (state == SIMIX_DONE) {
241 TRACE_msg_process_sleep_out(MSG_process_self());
246 TRACE_msg_process_sleep_out(MSG_process_self());
248 MSG_RETURN(MSG_HOST_FAILURE);
252 /** \ingroup msg_gos_functions
253 * \brief Listen on \a channel and waits for receiving a task from \a host.
255 * It takes three parameters.
256 * \param task a memory location for storing a #m_task_t. It will
257 hold a task when this function will return. Thus \a task should not
258 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
259 those two condition does not hold, there will be a warning message.
260 * \param channel the channel on which the agent should be
261 listening. This value has to be >=0 and < than the maximal
262 number of channels fixed with MSG_set_channel_number().
263 * \param host the host that is to be watched.
264 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
265 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
268 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
270 return MSG_task_get_ext(task, channel, -1, host);
273 /** \ingroup msg_gos_functions
274 * \brief Listen on a channel and wait for receiving a task.
276 * It takes two parameters.
277 * \param task a memory location for storing a #m_task_t. It will
278 hold a task when this function will return. Thus \a task should not
279 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
280 those two condition does not hold, there will be a warning message.
281 * \param channel the channel on which the agent should be
282 listening. This value has to be >=0 and < than the maximal
283 number of channels fixed with MSG_set_channel_number().
284 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
285 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
287 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
289 return MSG_task_get_with_timeout(task, channel, -1);
292 /** \ingroup msg_gos_functions
293 * \brief Listen on a channel and wait for receiving a task with a timeout.
295 * It takes three parameters.
296 * \param task a memory location for storing a #m_task_t. It will
297 hold a task when this function will return. Thus \a task should not
298 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
299 those two condition does not hold, there will be a warning message.
300 * \param channel the channel on which the agent should be
301 listening. This value has to be >=0 and < than the maximal
302 number of channels fixed with MSG_set_channel_number().
303 * \param max_duration the maximum time to wait for a task before giving
304 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
305 will not be modified and will still be
306 equal to \c NULL when returning.
307 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
308 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
311 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
314 return MSG_task_get_ext(task, channel, max_duration, NULL);
317 /** \defgroup msg_gos_functions MSG Operating System Functions
318 * \brief This section describes the functions that can be used
319 * by an agent for handling some task.
323 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
326 xbt_assert((channel >= 0)
327 && (channel < msg_global->max_channel), "Invalid channel %d",
331 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
332 (MSG_host_self(), channel), task, host,
337 MSG_task_receive_from_host(m_task_t * task, const char *alias,
340 return MSG_task_receive_ext(task, alias, -1, host);
343 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
345 return MSG_task_receive_with_timeout(task, alias, -1);
349 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
352 return MSG_task_receive_ext(task, alias, timeout, NULL);
356 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
360 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
362 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
366 /** \ingroup msg_gos_functions
367 * \brief Sends a task on a mailbox.
369 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
370 * to end the communication.
372 * \param task a #m_task_t to send on another location.
373 * \param alias name of the mailbox to sent the task to
374 * \return the msg_comm_t communication created
376 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
378 return MSG_task_isend_with_matching(task,alias,NULL,NULL);
381 /** \ingroup msg_gos_functions
382 * \brief Sends a task on a mailbox, with support for matching requests
384 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
385 * to end the communication.
387 * \param task a #m_task_t to send on another location.
388 * \param alias name of the mailbox to sent the task to
389 * \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
390 * \param match_data user provided data passed to match_fun
391 * \return the msg_comm_t communication created
393 XBT_INLINE msg_comm_t MSG_task_isend_with_matching(m_task_t task, const char *alias,
394 int (*match_fun)(void*,void*),
397 simdata_task_t t_simdata = NULL;
398 m_process_t process = MSG_process_self();
399 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
403 /* FIXME: these functions are not traceable */
405 /* Prepare the task to send */
406 t_simdata = task->simdata;
407 t_simdata->sender = process;
408 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
410 xbt_assert(t_simdata->isused == 0,
411 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
413 t_simdata->isused = 1;
414 msg_global->sent_msg++;
416 /* Send it by calling SIMIX network layer */
417 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
418 comm->task_sent = task;
419 comm->task_received = NULL;
420 comm->status = MSG_OK;
422 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
423 t_simdata->rate, task, sizeof(void *), match_fun, match_data, 0);
424 t_simdata->comm = comm->s_comm; /* FIXME: is the field t_simdata->comm still useful? */
429 /** \ingroup msg_gos_functions
430 * \brief Sends a task on a mailbox.
432 * This is a non blocking detached send function.
433 * Think of it as a best effort send. Keep in mind that the third parameter
434 * is only called if the communication fails. If the communication does work,
435 * it is responsibility of the receiver code to free anything related to
436 * the task, as usual. More details on this can be obtained on
437 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
438 * in the SimGrid-user mailing list archive.
440 * \param task a #m_task_t to send on another location.
441 * \param alias name of the mailbox to sent the task to
442 * \param cleanup a function to destroy the task if the
443 * communication fails (if NULL, MSG_task_destroy() will
444 * be used by default)
446 void MSG_task_dsend(m_task_t task, const char *alias, void_f_pvoid_t cleanup)
448 simdata_task_t t_simdata = NULL;
449 m_process_t process = MSG_process_self();
450 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
454 if (cleanup == NULL) {
455 cleanup = (void_f_pvoid_t) MSG_task_destroy;
458 /* FIXME: these functions are not traceable */
460 /* Prepare the task to send */
461 t_simdata = task->simdata;
462 t_simdata->sender = process;
463 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
465 xbt_assert(t_simdata->isused == 0,
466 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
468 t_simdata->isused = 1;
469 msg_global->sent_msg++;
471 /* Send it by calling SIMIX network layer */
472 smx_action_t comm = SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
473 t_simdata->rate, task, sizeof(void *), NULL, cleanup, 1);
474 t_simdata->comm = comm;
477 /** \ingroup msg_gos_functions
478 * \brief Starts listening for receiving a task from an asynchronous communication.
480 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
481 * to end the communication.
483 * \param task a memory location for storing a #m_task_t.
484 * \param name of the mailbox to receive the task on
485 * \return the msg_comm_t communication created
487 msg_comm_t MSG_task_irecv(m_task_t *task, const char *name)
489 smx_rdv_t rdv = MSG_mailbox_get_by_alias(name);
493 /* FIXME: these functions are not tracable */
496 xbt_assert(task, "Null pointer for the task storage");
500 ("MSG_task_get() was asked to write in a non empty task struct.");
502 /* Try to receive it by calling SIMIX network layer */
503 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
504 comm->task_sent = NULL;
505 comm->task_received = task;
506 comm->status = MSG_OK;
507 comm->s_comm = SIMIX_req_comm_irecv(rdv, task, NULL, NULL, NULL);
512 /** \ingroup msg_gos_functions
513 * \brief Checks whether a communication is done, and if yes, finalizes it.
514 * \param comm the communication to test
515 * \return TRUE if the communication is finished
516 * (but it may have failed, use MSG_comm_get_status() to know its status)
517 * or FALSE if the communication is not finished yet
518 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
520 int MSG_comm_test(msg_comm_t comm)
525 finished = SIMIX_req_comm_test(comm->s_comm);
527 if (finished && comm->task_received != NULL) {
528 /* I am the receiver */
529 (*comm->task_received)->simdata->isused = 0;
533 switch (e.category) {
536 comm->status = MSG_HOST_FAILURE;
541 comm->status = MSG_TRANSFER_FAILURE;
546 comm->status = MSG_TIMEOUT;
559 /** \ingroup msg_gos_functions
560 * \brief This function checks if a communication is finished.
561 * \param comms a vector of communications
562 * \return the position of the finished communication if any
563 * (but it may have failed, use MSG_comm_get_status() to know its status),
564 * or -1 if none is finished
566 int MSG_comm_testany(xbt_dynar_t comms)
569 int finished_index = -1;
571 /* create the equivalent dynar with SIMIX objects */
572 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
575 xbt_dynar_foreach(comms, cursor, comm) {
576 xbt_dynar_push(s_comms, &comm->s_comm);
579 MSG_error_t status = MSG_OK;
581 finished_index = SIMIX_req_comm_testany(s_comms);
584 switch (e.category) {
587 finished_index = e.value;
588 status = MSG_HOST_FAILURE;
592 finished_index = e.value;
593 status = MSG_TRANSFER_FAILURE;
597 finished_index = e.value;
598 status = MSG_TIMEOUT;
606 xbt_dynar_free(&s_comms);
608 if (finished_index != -1) {
609 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
610 /* the communication is finished */
611 comm->status = status;
613 if (status == MSG_OK && comm->task_received != NULL) {
614 /* I am the receiver */
615 (*comm->task_received)->simdata->isused = 0;
619 return finished_index;
622 /** \ingroup msg_gos_functions
623 * \brief Destroys a communication.
624 * \param comm the communication to destroy.
626 void MSG_comm_destroy(msg_comm_t comm)
628 if (comm->task_received != NULL
629 && *comm->task_received != NULL
630 && MSG_comm_get_status(comm) == MSG_OK) {
631 (*comm->task_received)->simdata->isused = 0;
637 /** \ingroup msg_gos_functions
638 * \brief Wait for the completion of a communication.
640 * It takes two parameters.
641 * \param comm the communication to wait.
642 * \param timeout Wait until the communication terminates or the timeout occurs
643 * \return MSG_error_t
645 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
649 SIMIX_req_comm_wait(comm->s_comm, timeout);
651 if (comm->task_received != NULL) {
652 /* I am the receiver */
653 (*comm->task_received)->simdata->isused = 0;
656 /* FIXME: these functions are not traceable */
659 switch (e.category) {
661 comm->status = MSG_HOST_FAILURE;
664 comm->status = MSG_TRANSFER_FAILURE;
667 comm->status = MSG_TIMEOUT;
678 /** \ingroup msg_gos_functions
679 * \brief This function is called by a sender and permit to wait for each communication
681 * \param comm a vector of communication
682 * \param nb_elem is the size of the comm vector
683 * \param timeout for each call of MSG_comm_wait
685 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
688 for (i = 0; i < nb_elem; i++) {
689 MSG_comm_wait(comm[i], timeout);
693 /** \ingroup msg_gos_functions
694 * \brief This function waits for the first communication finished in a list.
695 * \param comms a vector of communications
696 * \return the position of the first finished communication
697 * (but it may have failed, use MSG_comm_get_status() to know its status)
699 int MSG_comm_waitany(xbt_dynar_t comms)
702 int finished_index = -1;
704 /* create the equivalent dynar with SIMIX objects */
705 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
708 xbt_dynar_foreach(comms, cursor, comm) {
709 xbt_dynar_push(s_comms, &comm->s_comm);
712 MSG_error_t status = MSG_OK;
714 finished_index = SIMIX_req_comm_waitany(s_comms);
717 switch (e.category) {
720 finished_index = e.value;
721 status = MSG_HOST_FAILURE;
725 finished_index = e.value;
726 status = MSG_TRANSFER_FAILURE;
730 finished_index = e.value;
731 status = MSG_TIMEOUT;
740 xbt_assert(finished_index != -1, "WaitAny returned -1");
741 xbt_dynar_free(&s_comms);
743 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
744 /* the communication is finished */
745 comm->status = status;
747 return finished_index;
751 * \ingroup msg_gos_functions
752 * \brief Returns the error (if any) that occured during a finished communication.
753 * \param comm a finished communication
754 * \return the status of the communication, or MSG_OK if no error occured
755 * during the communication
757 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
762 m_task_t MSG_comm_get_task(msg_comm_t comm)
764 xbt_assert(comm, "Invalid parameter");
766 return comm->task_received ? *comm->task_received : comm->task_sent;
769 /** \ingroup msg_gos_functions
770 * \brief Put a task on a channel of an host and waits for the end of the
773 * This function is used for describing the behavior of an agent. It
774 * takes three parameter.
775 * \param task a #m_task_t to send on another location. This task
776 will not be usable anymore when the function will return. There is
777 no automatic task duplication and you have to save your parameters
778 before calling this function. Tasks are unique and once it has been
779 sent to another location, you should not access it anymore. You do
780 not need to call MSG_task_destroy() but to avoid using, as an
781 effect of inattention, this task anymore, you definitely should
782 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
783 can be transfered iff it has been correctly created with
785 * \param dest the destination of the message
786 * \param channel the channel on which the agent should put this
787 task. This value has to be >=0 and < than the maximal number of
788 channels fixed with MSG_set_channel_number().
789 * \return #MSG_FATAL if \a task is not properly initialized and
790 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
791 * this function was called was shut down. Returns
792 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
793 * (network failure, dest failure)
795 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
797 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
800 /** \ingroup msg_gos_functions
801 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
807 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
810 task->simdata->rate = maxrate;
811 return MSG_task_put(task, dest, channel);
814 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
815 * host (with a timeout on the waiting of the destination host) and
816 * waits for the end of the transmission.
818 * This function is used for describing the behavior of an agent. It
819 * takes four parameter.
820 * \param task a #m_task_t to send on another location. This task
821 will not be usable anymore when the function will return. There is
822 no automatic task duplication and you have to save your parameters
823 before calling this function. Tasks are unique and once it has been
824 sent to another location, you should not access it anymore. You do
825 not need to call MSG_task_destroy() but to avoid using, as an
826 effect of inattention, this task anymore, you definitely should
827 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
828 can be transfered iff it has been correctly created with
830 * \param dest the destination of the message
831 * \param channel the channel on which the agent should put this
832 task. This value has to be >=0 and < than the maximal number of
833 channels fixed with MSG_set_channel_number().
834 * \param timeout the maximum time to wait for a task before giving
835 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
837 * \return #MSG_FATAL if \a task is not properly initialized and
838 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
839 this function was called was shut down. Returns
840 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
841 (network failure, dest failure, timeout...)
844 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
845 m_channel_t channel, double timeout)
847 xbt_assert((channel >= 0)
848 && (channel < msg_global->max_channel), "Invalid channel %d",
851 XBT_DEBUG("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
853 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
854 (dest, channel), task, timeout);
857 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
859 XBT_DEBUG("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
860 return MSG_task_send_with_timeout(task, alias, -1);
865 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
867 task->simdata->rate = maxrate;
868 return MSG_task_send(task, alias);
873 MSG_task_send_with_timeout(m_task_t task, const char *alias,
876 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
880 int MSG_task_listen(const char *alias)
884 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
887 /** \ingroup msg_gos_functions
888 * \brief Test whether there is a pending communication on a channel.
890 * It takes one parameter.
891 * \param channel the channel on which the agent should be
892 listening. This value has to be >=0 and < than the maximal
893 number of channels fixed with MSG_set_channel_number().
894 * \return 1 if there is a pending communication and 0 otherwise
896 int MSG_task_Iprobe(m_channel_t channel)
898 xbt_assert((channel >= 0)
899 && (channel < msg_global->max_channel), "Invalid channel %d",
905 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
906 (MSG_host_self(), channel));
909 /** \ingroup msg_gos_functions
911 * \brief Return the number of tasks waiting to be received on a \a
912 channel and sent by \a host.
914 * It takes two parameters.
915 * \param channel the channel on which the agent should be
916 listening. This value has to be >=0 and < than the maximal
917 number of channels fixed with MSG_set_channel_number().
918 * \param host the host that is to be watched.
919 * \return the number of tasks waiting to be received on \a channel
922 int MSG_task_probe_from_host(int channel, m_host_t host)
924 xbt_assert((channel >= 0)
925 && (channel < msg_global->max_channel), "Invalid channel %d",
931 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
932 (MSG_host_self(), channel),
937 int MSG_task_listen_from_host(const char *alias, m_host_t host)
942 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
946 /** \ingroup msg_gos_functions
947 * \brief Test whether there is a pending communication on a channel, and who sent it.
949 * It takes one parameter.
950 * \param channel the channel on which the agent should be
951 listening. This value has to be >=0 and < than the maximal
952 number of channels fixed with MSG_set_channel_number().
953 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
955 int MSG_task_probe_from(m_channel_t channel)
961 xbt_assert((channel >= 0)
962 && (channel < msg_global->max_channel), "Invalid channel %d",
967 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
968 (MSG_host_self(), channel))))
971 return MSG_process_get_PID(task->simdata->sender);
974 int MSG_task_listen_from(const char *alias)
981 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
984 return MSG_process_get_PID(task->simdata->sender);
987 #ifdef MSG_USE_DEPRECATED
988 /** \ingroup msg_gos_functions
990 * \brief Return the last value returned by a MSG function (except
993 MSG_error_t MSG_get_errno(void)
995 return PROCESS_GET_ERRNO();