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 "simix/private.h"
9 #include "xbt/sysdep.h"
15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
16 "Logging specific to MSG (gos)");
18 /** \ingroup msg_gos_functions
20 * \brief Return the last value returned by a MSG function (except
23 MSG_error_t MSG_get_errno(void)
25 return PROCESS_GET_ERRNO();
28 /** \ingroup msg_gos_functions
29 * \brief Executes a task and waits for its termination.
31 * This function is used for describing the behavior of an agent. It
32 * takes only one parameter.
33 * \param task a #m_task_t to execute on the location on which the
35 * \return #MSG_FATAL if \a task is not properly initialized and
38 MSG_error_t MSG_task_execute(m_task_t task)
40 simdata_task_t simdata = NULL;
41 m_process_t self = MSG_process_self();
42 e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
45 simdata = task->simdata;
47 xbt_assert0(simdata->host_nb==0, "This is a parallel task. Go to hell.");
50 TRACE_msg_task_execute_start (task);
53 xbt_assert1((!simdata->compute) && (task->simdata->refcount == 1),
54 "This task is executed somewhere else. Go fix your code! %d", task->simdata->refcount);
56 DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
58 if (simdata->computation_amount == 0) {
60 TRACE_msg_task_execute_end (task);
65 SIMIX_mutex_lock(simdata->mutex);
67 SIMIX_action_execute(SIMIX_host_self(), task->name,
68 simdata->computation_amount);
69 SIMIX_action_set_priority(simdata->compute, simdata->priority);
71 /* changed to waiting action since we are always waiting one action (execute, communicate or sleep) */
72 self->simdata->waiting_action = simdata->compute;
73 SIMIX_register_action_to_condition(simdata->compute, simdata->cond);
75 SIMIX_cond_wait(simdata->cond, simdata->mutex);
76 state = SIMIX_action_get_state(simdata->compute);
77 } while (state == SURF_ACTION_READY || state == SURF_ACTION_RUNNING);
78 SIMIX_unregister_action_to_condition(simdata->compute, simdata->cond);
79 self->simdata->waiting_action = NULL;
81 SIMIX_mutex_unlock(simdata->mutex);
84 if (SIMIX_action_get_state(task->simdata->compute) == SURF_ACTION_DONE) {
85 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
86 SIMIX_action_destroy(task->simdata->compute);
87 simdata->computation_amount = 0.0;
89 simdata->compute = NULL;
91 TRACE_msg_task_execute_end (task);
94 } else if (SIMIX_host_get_state(SIMIX_host_self()) == 0) {
95 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
96 SIMIX_action_destroy(task->simdata->compute);
98 simdata->compute = NULL;
100 TRACE_msg_task_execute_end (task);
102 MSG_RETURN(MSG_HOST_FAILURE);
104 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
105 SIMIX_action_destroy(task->simdata->compute);
106 simdata->comm = NULL;
107 simdata->compute = NULL;
109 TRACE_msg_task_execute_end (task);
111 MSG_RETURN(MSG_TASK_CANCELLED);
115 /** \ingroup m_task_management
116 * \brief Creates a new #m_task_t (a parallel one....).
118 * A constructor for #m_task_t taking six arguments and returning the
119 corresponding object.
120 * \param name a name for the object. It is for user-level information
122 * \param host_nb the number of hosts implied in the parallel task.
123 * \param host_list an array of \p host_nb m_host_t.
124 * \param computation_amount an array of \p host_nb
125 doubles. computation_amount[i] is the total number of operations
126 that have to be performed on host_list[i].
127 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
128 * \param data a pointer to any data may want to attach to the new
129 object. It is for user-level information and can be NULL. It can
130 be retrieved with the function \ref MSG_task_get_data.
132 * \return The new corresponding object.
135 MSG_parallel_task_create(const char *name, int host_nb,
136 const m_host_t * host_list,
137 double *computation_amount,
138 double *communication_amount, void *data)
141 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
142 m_task_t task = xbt_new0(s_m_task_t, 1);
143 task->simdata = simdata;
146 task->name = xbt_strdup(name);
150 simdata->computation_amount = 0;
151 simdata->message_size = 0;
152 simdata->cond = SIMIX_cond_init();
153 simdata->mutex = SIMIX_mutex_init();
154 simdata->compute = NULL;
155 simdata->comm = NULL;
156 simdata->rate = -1.0;
157 simdata->refcount = 1;
158 simdata->sender = NULL;
159 simdata->receiver = NULL;
160 simdata->source = NULL;
162 simdata->host_nb = host_nb;
163 simdata->host_list = xbt_new0(smx_host_t, host_nb);
164 simdata->comp_amount = computation_amount;
165 simdata->comm_amount = communication_amount;
167 for (i = 0; i < host_nb; i++)
168 simdata->host_list[i] = host_list[i]->simdata->smx_host;
173 MSG_error_t MSG_parallel_task_execute(m_task_t task)
175 simdata_task_t simdata = NULL;
176 m_process_t self = MSG_process_self();
177 e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
180 simdata = task->simdata;
182 xbt_assert0((!simdata->compute)
183 && (task->simdata->refcount == 1),
184 "This task is executed somewhere else. Go fix your code!");
186 xbt_assert0(simdata->host_nb, "This is not a parallel task. Go to hell.");
188 DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
192 SIMIX_mutex_lock(simdata->mutex);
194 SIMIX_action_parallel_execute(task->name, simdata->host_nb,
195 simdata->host_list, simdata->comp_amount,
196 simdata->comm_amount, 1.0, -1.0);
198 self->simdata->waiting_action = simdata->compute;
199 SIMIX_register_action_to_condition(simdata->compute, simdata->cond);
201 SIMIX_cond_wait(simdata->cond, simdata->mutex);
202 state = SIMIX_action_get_state(task->simdata->compute);
203 } while (state == SURF_ACTION_READY || state == SURF_ACTION_RUNNING);
205 SIMIX_unregister_action_to_condition(simdata->compute, simdata->cond);
206 self->simdata->waiting_action = NULL;
209 SIMIX_mutex_unlock(simdata->mutex);
212 if (SIMIX_action_get_state(task->simdata->compute) == SURF_ACTION_DONE) {
213 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
214 SIMIX_action_destroy(task->simdata->compute);
215 simdata->computation_amount = 0.0;
216 simdata->comm = NULL;
217 simdata->compute = NULL;
219 } else if (SIMIX_host_get_state(SIMIX_host_self()) == 0) {
220 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
221 SIMIX_action_destroy(task->simdata->compute);
222 simdata->comm = NULL;
223 simdata->compute = NULL;
224 MSG_RETURN(MSG_HOST_FAILURE);
226 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
227 SIMIX_action_destroy(task->simdata->compute);
228 simdata->comm = NULL;
229 simdata->compute = NULL;
230 MSG_RETURN(MSG_TASK_CANCELLED);
236 /** \ingroup msg_gos_functions
237 * \brief Sleep for the specified number of seconds
239 * Makes the current process sleep until \a time seconds have elapsed.
241 * \param nb_sec a number of second
243 MSG_error_t MSG_process_sleep(double nb_sec)
245 smx_action_t act_sleep;
246 m_process_t proc = MSG_process_self();
247 e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
252 TRACE_msg_process_sleep_in (MSG_process_self());
255 /* create action to sleep */
257 SIMIX_action_sleep(SIMIX_process_get_host(proc->simdata->s_process),
260 mutex = SIMIX_mutex_init();
261 SIMIX_mutex_lock(mutex);
263 /* create conditional and register action to it */
264 cond = SIMIX_cond_init();
266 proc->simdata->waiting_action = act_sleep;
267 SIMIX_register_action_to_condition(act_sleep, cond);
269 SIMIX_cond_wait(cond, mutex);
270 state = SIMIX_action_get_state(act_sleep);
271 } while (state == SURF_ACTION_READY || state == SURF_ACTION_RUNNING);
272 proc->simdata->waiting_action = NULL;
273 SIMIX_unregister_action_to_condition(act_sleep, cond);
274 SIMIX_mutex_unlock(mutex);
276 /* remove variables */
277 SIMIX_cond_destroy(cond);
278 SIMIX_mutex_destroy(mutex);
280 if (SIMIX_action_get_state(act_sleep) == SURF_ACTION_DONE) {
281 if (SIMIX_host_get_state(SIMIX_host_self()) == SURF_RESOURCE_OFF) {
282 SIMIX_action_destroy(act_sleep);
284 TRACE_msg_process_sleep_out (MSG_process_self());
286 MSG_RETURN(MSG_HOST_FAILURE);
289 SIMIX_action_destroy(act_sleep);
291 TRACE_msg_process_sleep_out (MSG_process_self());
293 MSG_RETURN(MSG_HOST_FAILURE);
296 SIMIX_action_destroy(act_sleep);
298 TRACE_msg_process_sleep_out (MSG_process_self());
303 /** \ingroup msg_gos_functions
304 * \brief Listen on \a channel and waits for receiving a task from \a host.
306 * It takes three parameters.
307 * \param task a memory location for storing a #m_task_t. It will
308 hold a task when this function will return. Thus \a task should not
309 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
310 those two condition does not hold, there will be a warning message.
311 * \param channel the channel on which the agent should be
312 listening. This value has to be >=0 and < than the maximal
313 number of channels fixed with MSG_set_channel_number().
314 * \param host the host that is to be watched.
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_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
321 return MSG_task_get_ext(task, channel, -1, host);
324 /** \ingroup msg_gos_functions
325 * \brief Listen on a channel and wait for receiving a task.
327 * It takes two parameters.
328 * \param task a memory location for storing a #m_task_t. It will
329 hold a task when this function will return. Thus \a task should not
330 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
331 those two condition does not hold, there will be a warning message.
332 * \param channel the channel on which the agent should be
333 listening. This value has to be >=0 and < than the maximal
334 number of channels fixed with MSG_set_channel_number().
335 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
336 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
338 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
340 return MSG_task_get_with_timeout(task, channel, -1);
343 /** \ingroup msg_gos_functions
344 * \brief Listen on a channel and wait for receiving a task with a timeout.
346 * It takes three parameters.
347 * \param task a memory location for storing a #m_task_t. It will
348 hold a task when this function will return. Thus \a task should not
349 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
350 those two condition does not hold, there will be a warning message.
351 * \param channel the channel on which the agent should be
352 listening. This value has to be >=0 and < than the maximal
353 number of channels fixed with MSG_set_channel_number().
354 * \param max_duration the maximum time to wait for a task before giving
355 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
356 will not be modified and will still be
357 equal to \c NULL when returning.
358 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
359 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
362 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
365 return MSG_task_get_ext(task, channel, max_duration, NULL);
368 /** \defgroup msg_gos_functions MSG Operating System Functions
369 * \brief This section describes the functions that can be used
370 * by an agent for handling some task.
374 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
377 xbt_assert1((channel >= 0)
378 && (channel < msg_global->max_channel), "Invalid channel %d",
382 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
383 (MSG_host_self(), channel), task, host, timeout);
387 MSG_task_receive_from_host(m_task_t * task, const char *alias, m_host_t host)
389 return MSG_task_receive_ext(task, alias, -1, host);
392 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
394 return MSG_task_receive_with_timeout(task, alias, -1);
398 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
401 return MSG_task_receive_ext(task, alias, timeout, NULL);
405 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
408 DEBUG1("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",alias);
409 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task, host,
413 /** \ingroup msg_gos_functions
414 * \brief Send a task on a channel.
416 * This function takes two parameter.
417 * \param task a #m_task_t to send on another location.
418 * \param alias the channel on which the agent should put this
419 task. This value has to be >=0 and < than the maximal number of
420 channels fixed with MSG_set_channel_number().
421 * \return the msg_comm_t communication.
423 msg_comm_t MSG_task_isend(m_task_t task, const char *alias) {
424 simdata_task_t t_simdata = NULL;
425 m_process_t process = MSG_process_self();
426 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
430 /* FIXME: these functions are not tracable */
432 /* Prepare the task to send */
433 t_simdata = task->simdata;
434 t_simdata->sender = process;
435 t_simdata->source = MSG_host_self();
437 xbt_assert0(t_simdata->refcount == 1,
438 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
440 t_simdata->refcount++;
441 msg_global->sent_msg++;
442 process->simdata->waiting_task = task;
444 /* Send it by calling SIMIX network layer */
446 /* Kept for semantical compatibility with older implementation */
448 SIMIX_cond_signal(mailbox->cond);
450 return SIMIX_network_isend(mailbox->rdv, t_simdata->message_size, t_simdata->rate,
451 task, sizeof(void*), &t_simdata->comm);
454 /** \ingroup msg_gos_functions
455 * \brief Listen on a channel for receiving a task from an asynchronous communication.
457 * It takes two parameters.
458 * \param task a memory location for storing a #m_task_t.
459 * \param alias the channel on which the agent should be
460 listening. This value has to be >=0 and < than the maximal
461 number of channels fixed with MSG_set_channel_number().
462 * \return the msg_comm_t communication.
464 msg_comm_t MSG_task_irecv(m_task_t * task, const char *alias) {
466 smx_rdv_t rdv = MSG_mailbox_get_by_alias(alias)->rdv;
467 msg_mailbox_t mailbox=MSG_mailbox_get_by_alias(alias);
468 size_t size = sizeof(void*);
472 /* FIXME: these functions are not tracable */
474 memset(&comm,0,sizeof(comm));
476 /* Kept for compatibility with older implementation */
477 xbt_assert1(!MSG_mailbox_get_cond(mailbox),
478 "A process is already blocked on this channel %s",
479 MSG_mailbox_get_alias(mailbox));
482 xbt_assert0(task, "Null pointer for the task storage");
485 CRITICAL0("MSG_task_get() was asked to write in a non empty task struct.");
487 /* Try to receive it by calling SIMIX network layer */
488 return SIMIX_network_irecv(rdv, task, &size);
490 /** \ingroup msg_gos_functions
491 * \brief Test the status of a communication.
493 * It takes one parameter.
494 * \param comm the communication to test.
495 * \return the status of the communication:
496 * TRUE : the communication is completed
497 * FALSE: the communication is incompleted
498 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
500 int MSG_comm_test(msg_comm_t comm) {
501 return SIMIX_network_test(comm);
503 /** \ingroup msg_gos_functions
504 * \brief After received TRUE to MSG_comm_test(), the communication must be destroyed.
506 * It takes one parameter.
507 * \param comm the communication to destroy.
509 void MSG_comm_destroy(msg_comm_t comm) {
510 if(!(comm->src_proc == SIMIX_process_self()))
513 task = (m_task_t) SIMIX_communication_get_src_buf(comm);
514 task->simdata->refcount--;
516 SIMIX_communication_destroy(comm);
519 /** \ingroup msg_gos_functions
520 * \brief Wait for the completion of a communication.
522 * It takes two parameters.
523 * \param comm the communication to wait.
524 * \param timeout Wait until the communication terminates or the timeout occurs
525 * \return MSG_error_t
527 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout) {
529 MSG_error_t res = MSG_OK;
531 SIMIX_network_wait(comm,timeout);
533 if(!(comm->src_proc == SIMIX_process_self()))
536 task = (m_task_t) SIMIX_communication_get_src_buf(comm);
537 task->simdata->refcount--;
540 /* FIXME: these functions are not tracable */
544 res = MSG_HOST_FAILURE;
547 res = MSG_TRANSFER_FAILURE;
553 xbt_die(bprintf("Unhandled SIMIX network exception: %s",e.msg));
560 /** \ingroup msg_gos_functions
561 * \brief This function is called by a sender and permit to wait for each communication
563 * It takes three parameters.
564 * \param comm a vector of communication
565 * \param nb_elem is the size of the comm vector
566 * \param timeout for each call of MSG_comm_wait
568 void MSG_comm_waitall(msg_comm_t *comm,int nb_elem, double timeout) {
570 for(i=0; i<nb_elem; i++)
572 MSG_comm_wait(comm[i],timeout);
575 /** \ingroup msg_gos_functions
576 * \brief This function wait for the first completed communication
578 * It takes on parameter.
579 * \param comms a vector of communication
580 * \return the position of the completed communication from the xbt_dynar_t.
582 int MSG_comm_waitany(xbt_dynar_t comms) {
583 return SIMIX_network_waitany(comms);
586 m_task_t MSG_comm_get_task(msg_comm_t comm) {
587 xbt_assert0(comm, "Invalid parameters");
588 return (m_task_t) SIMIX_communication_get_src_buf(comm);
591 /** \ingroup msg_gos_functions
592 * \brief Put a task on a channel of an host and waits for the end of the
595 * This function is used for describing the behavior of an agent. It
596 * takes three parameter.
597 * \param task a #m_task_t to send on another location. This task
598 will not be usable anymore when the function will return. There is
599 no automatic task duplication and you have to save your parameters
600 before calling this function. Tasks are unique and once it has been
601 sent to another location, you should not access it anymore. You do
602 not need to call MSG_task_destroy() but to avoid using, as an
603 effect of inattention, this task anymore, you definitely should
604 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
605 can be transfered iff it has been correctly created with
607 * \param dest the destination of the message
608 * \param channel the channel on which the agent should put this
609 task. This value has to be >=0 and < than the maximal number of
610 channels fixed with MSG_set_channel_number().
611 * \return #MSG_FATAL if \a task is not properly initialized and
612 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
613 * this function was called was shut down. Returns
614 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
615 * (network failure, dest failure)
617 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
619 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
622 /** \ingroup msg_gos_functions
623 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
629 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
632 task->simdata->rate = maxrate;
633 return MSG_task_put(task, dest, channel);
636 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
637 * host (with a timeout on the waiting of the destination host) and
638 * waits for the end of the transmission.
640 * This function is used for describing the behavior of an agent. It
641 * takes four parameter.
642 * \param task a #m_task_t to send on another location. This task
643 will not be usable anymore when the function will return. There is
644 no automatic task duplication and you have to save your parameters
645 before calling this function. Tasks are unique and once it has been
646 sent to another location, you should not access it anymore. You do
647 not need to call MSG_task_destroy() but to avoid using, as an
648 effect of inattention, this task anymore, you definitely should
649 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
650 can be transfered iff it has been correctly created with
652 * \param dest the destination of the message
653 * \param channel the channel on which the agent should put this
654 task. This value has to be >=0 and < than the maximal number of
655 channels fixed with MSG_set_channel_number().
656 * \param timeout the maximum time to wait for a task before giving
657 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
659 * \return #MSG_FATAL if \a task is not properly initialized and
660 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
661 this function was called was shut down. Returns
662 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
663 (network failure, dest failure, timeout...)
666 MSG_task_put_with_timeout(m_task_t task, m_host_t dest, m_channel_t channel,
669 xbt_assert1((channel >= 0)
670 && (channel < msg_global->max_channel), "Invalid channel %d",
674 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel(dest, channel),
678 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
680 DEBUG1("MSG_task_send: Trying to send a message on mailbox '%s'",alias);
681 return MSG_task_send_with_timeout(task, alias, -1);
686 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
688 task->simdata->rate = maxrate;
689 return MSG_task_send(task, alias);
694 MSG_task_send_with_timeout(m_task_t task, const char *alias, double timeout)
696 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias), task,
700 int MSG_task_listen(const char *alias)
704 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
707 /** \ingroup msg_gos_functions
708 * \brief Test whether there is a pending communication on a channel.
710 * It takes one parameter.
711 * \param channel the channel on which the agent should be
712 listening. This value has to be >=0 and < than the maximal
713 number of channels fixed with MSG_set_channel_number().
714 * \return 1 if there is a pending communication and 0 otherwise
716 int MSG_task_Iprobe(m_channel_t channel)
718 xbt_assert1((channel >= 0)
719 && (channel < msg_global->max_channel), "Invalid channel %d",
725 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
726 (MSG_host_self(), channel));
729 /** \ingroup msg_gos_functions
731 * \brief Return the number of tasks waiting to be received on a \a
732 channel and sent by \a host.
734 * It takes two parameters.
735 * \param channel the channel on which the agent should be
736 listening. This value has to be >=0 and < than the maximal
737 number of channels fixed with MSG_set_channel_number().
738 * \param host the host that is to be watched.
739 * \return the number of tasks waiting to be received on \a channel
742 int MSG_task_probe_from_host(int channel, m_host_t host)
744 xbt_assert1((channel >= 0)
745 && (channel < msg_global->max_channel), "Invalid channel %d",
751 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
752 (MSG_host_self(), channel),
757 int MSG_task_listen_from_host(const char *alias, m_host_t host)
762 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias(alias),
766 /** \ingroup msg_gos_functions
767 * \brief Test whether there is a pending communication on a channel, and who sent it.
769 * It takes one parameter.
770 * \param channel the channel on which the agent should be
771 listening. This value has to be >=0 and < than the maximal
772 number of channels fixed with MSG_set_channel_number().
773 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
775 int MSG_task_probe_from(m_channel_t channel)
781 xbt_assert1((channel >= 0)
782 && (channel < msg_global->max_channel), "Invalid channel %d",
787 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
788 (MSG_host_self(), channel))))
791 return MSG_process_get_PID(task->simdata->sender);
794 int MSG_task_listen_from(const char *alias)
800 if (NULL == (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
803 return MSG_process_get_PID(task->simdata->sender);
806 /** \ingroup msg_gos_functions
807 * \brief Wait for at most \a max_duration second for a task reception
810 * \a PID is updated with the PID of the first process that triggered this event if any.
812 * It takes three parameters:
813 * \param channel the channel on which the agent should be
814 listening. This value has to be >=0 and < than the maximal.
815 number of channels fixed with MSG_set_channel_number().
816 * \param PID a memory location for storing an int.
817 * \param timeout the maximum time to wait for a task before
818 giving up. In the case of a reception, *\a PID will be updated
819 with the PID of the first process to send a task.
820 * \return #MSG_HOST_FAILURE if the host is shut down in the meantime
821 and #MSG_OK otherwise.
824 MSG_channel_select_from(m_channel_t channel, double timeout, int *PID)
827 simdata_host_t h_simdata = NULL;
831 msg_mailbox_t mailbox;
833 xbt_assert1((channel >= 0)
834 && (channel < msg_global->max_channel), "Invalid channel %d",
841 if (timeout == 0.0) {
842 *PID = MSG_task_probe_from(channel);
847 h_simdata = h->simdata;
849 mailbox = MSG_mailbox_get_by_channel(MSG_host_self(), channel);
851 while (MSG_mailbox_is_empty(mailbox)) {
858 SIMIX_mutex_lock(h_simdata->mutex);
860 xbt_assert1(!MSG_mailbox_get_cond(mailbox),
861 "A process is already blocked on this channel %d", channel);
863 cond = SIMIX_cond_init();
865 MSG_mailbox_set_cond(mailbox, cond);
868 SIMIX_cond_wait_timeout(cond, h_simdata->mutex, timeout);
870 SIMIX_cond_wait(cond, h_simdata->mutex);
873 SIMIX_cond_destroy(cond);
874 SIMIX_mutex_unlock(h_simdata->mutex);
876 if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
877 MSG_RETURN(MSG_HOST_FAILURE);
880 MSG_mailbox_set_cond(mailbox, NULL);
884 if (NULL == (t = MSG_mailbox_get_head(mailbox)))
889 *PID = MSG_process_get_PID(t->simdata->sender);
897 MSG_error_t MSG_alias_select_from(const char *alias, double timeout, int *PID)
900 simdata_host_t h_simdata = NULL;
904 msg_mailbox_t mailbox;
910 if (timeout == 0.0) {
911 *PID = MSG_task_listen_from(alias);
916 h_simdata = h->simdata;
918 DEBUG2("Probing on alias %s (%s)", alias, h->name);
920 mailbox = MSG_mailbox_get_by_alias(alias);
922 while (MSG_mailbox_is_empty(mailbox)) {
929 SIMIX_mutex_lock(h_simdata->mutex);
931 xbt_assert1(!MSG_mailbox_get_cond(mailbox),
932 "A process is already blocked on this alias %s", alias);
934 cond = SIMIX_cond_init();
936 MSG_mailbox_set_cond(mailbox, cond);
939 SIMIX_cond_wait_timeout(cond, h_simdata->mutex, timeout);
941 SIMIX_cond_wait(cond, h_simdata->mutex);
944 SIMIX_cond_destroy(cond);
945 SIMIX_mutex_unlock(h_simdata->mutex);
947 if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
948 MSG_RETURN(MSG_HOST_FAILURE);
951 MSG_mailbox_set_cond(mailbox, NULL);
955 if (NULL == (t = MSG_mailbox_get_head(mailbox)))
960 *PID = MSG_process_get_PID(t->simdata->sender);