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);
471 /* FIXME: these functions are not tracable */
473 memset(&comm,0,sizeof(comm));
475 /* Kept for compatibility with older implementation */
476 xbt_assert1(!MSG_mailbox_get_cond(mailbox),
477 "A process is already blocked on this channel %s",
478 MSG_mailbox_get_alias(mailbox));
481 xbt_assert0(task, "Null pointer for the task storage");
484 CRITICAL0("MSG_task_get() was asked to write in a non empty task struct.");
486 /* Try to receive it by calling SIMIX network layer */
487 return SIMIX_network_irecv(rdv, task, NULL);
489 /** \ingroup msg_gos_functions
490 * \brief Test the status of a communication.
492 * It takes one parameter.
493 * \param comm the communication to test.
494 * \return the status of the communication:
495 * TRUE : the communication is completed
496 * FALSE: the communication is incompleted
497 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
499 int MSG_comm_test(msg_comm_t comm) {
500 return SIMIX_network_test(comm);
502 /** \ingroup msg_gos_functions
503 * \brief After received TRUE to MSG_comm_test(), the communication must be destroyed.
505 * It takes one parameter.
506 * \param comm the communication to destroy.
508 void MSG_comm_destroy(msg_comm_t comm) {
509 if(!(comm->src_proc == SIMIX_process_self()))
512 task = (m_task_t) SIMIX_communication_get_src_buf(comm);
513 task->simdata->refcount--;
515 SIMIX_communication_destroy(comm);
518 /** \ingroup msg_gos_functions
519 * \brief Wait for the completion of a communication.
521 * It takes two parameters.
522 * \param comm the communication to wait.
523 * \param timeout Wait until the communication terminates or the timeout occurs
524 * \return MSG_error_t
526 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout) {
528 MSG_error_t res = MSG_OK;
530 SIMIX_network_wait(comm,timeout);
532 if(!(comm->src_proc == SIMIX_process_self()))
535 task = (m_task_t) SIMIX_communication_get_src_buf(comm);
536 task->simdata->refcount--;
539 /* FIXME: these functions are not tracable */
543 res = MSG_HOST_FAILURE;
546 res = MSG_TRANSFER_FAILURE;
552 xbt_die(bprintf("Unhandled SIMIX network exception: %s",e.msg));
559 /** \ingroup msg_gos_functions
560 * \brief This function is called by a sender and permit to wait for each communication
562 * It takes three parameters.
563 * \param comm a vector of communication
564 * \param nb_elem is the size of the comm vector
565 * \param timeout for each call of MSG_comm_wait
567 void MSG_comm_waitall(msg_comm_t *comm,int nb_elem, double timeout) {
569 for(i=0; i<nb_elem; i++)
571 MSG_comm_wait(comm[i],timeout);
574 /** \ingroup msg_gos_functions
575 * \brief This function wait for the first completed communication
577 * It takes on parameter.
578 * \param comms a vector of communication
579 * \return the position of the completed communication from the xbt_dynar_t.
581 int MSG_comm_waitany(xbt_dynar_t comms) {
582 return SIMIX_network_waitany(comms);
585 m_task_t MSG_comm_get_task(msg_comm_t comm) {
586 xbt_assert0(comm, "Invalid parameters");
587 return (m_task_t) SIMIX_communication_get_src_buf(comm);
590 /** \ingroup msg_gos_functions
591 * \brief Put a task on a channel of an host and waits for the end of the
594 * This function is used for describing the behavior of an agent. It
595 * takes three parameter.
596 * \param task a #m_task_t to send on another location. This task
597 will not be usable anymore when the function will return. There is
598 no automatic task duplication and you have to save your parameters
599 before calling this function. Tasks are unique and once it has been
600 sent to another location, you should not access it anymore. You do
601 not need to call MSG_task_destroy() but to avoid using, as an
602 effect of inattention, this task anymore, you definitely should
603 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
604 can be transfered iff it has been correctly created with
606 * \param dest the destination of the message
607 * \param channel the channel on which the agent should put this
608 task. This value has to be >=0 and < than the maximal number of
609 channels fixed with MSG_set_channel_number().
610 * \return #MSG_FATAL if \a task is not properly initialized and
611 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
612 * this function was called was shut down. Returns
613 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
614 * (network failure, dest failure)
616 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
618 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
621 /** \ingroup msg_gos_functions
622 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
628 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
631 task->simdata->rate = maxrate;
632 return MSG_task_put(task, dest, channel);
635 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
636 * host (with a timeout on the waiting of the destination host) and
637 * waits for the end of the transmission.
639 * This function is used for describing the behavior of an agent. It
640 * takes four parameter.
641 * \param task a #m_task_t to send on another location. This task
642 will not be usable anymore when the function will return. There is
643 no automatic task duplication and you have to save your parameters
644 before calling this function. Tasks are unique and once it has been
645 sent to another location, you should not access it anymore. You do
646 not need to call MSG_task_destroy() but to avoid using, as an
647 effect of inattention, this task anymore, you definitely should
648 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
649 can be transfered iff it has been correctly created with
651 * \param dest the destination of the message
652 * \param channel the channel on which the agent should put this
653 task. This value has to be >=0 and < than the maximal number of
654 channels fixed with MSG_set_channel_number().
655 * \param timeout the maximum time to wait for a task before giving
656 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
658 * \return #MSG_FATAL if \a task is not properly initialized and
659 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
660 this function was called was shut down. Returns
661 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
662 (network failure, dest failure, timeout...)
665 MSG_task_put_with_timeout(m_task_t task, m_host_t dest, m_channel_t channel,
668 xbt_assert1((channel >= 0)
669 && (channel < msg_global->max_channel), "Invalid channel %d",
673 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel(dest, channel),
677 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
679 DEBUG1("MSG_task_send: Trying to send a message on mailbox '%s'",alias);
680 return MSG_task_send_with_timeout(task, alias, -1);
685 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
687 task->simdata->rate = maxrate;
688 return MSG_task_send(task, alias);
693 MSG_task_send_with_timeout(m_task_t task, const char *alias, double timeout)
695 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias), task,
699 int MSG_task_listen(const char *alias)
703 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
706 /** \ingroup msg_gos_functions
707 * \brief Test whether there is a pending communication on a channel.
709 * It takes one parameter.
710 * \param channel the channel on which the agent should be
711 listening. This value has to be >=0 and < than the maximal
712 number of channels fixed with MSG_set_channel_number().
713 * \return 1 if there is a pending communication and 0 otherwise
715 int MSG_task_Iprobe(m_channel_t channel)
717 xbt_assert1((channel >= 0)
718 && (channel < msg_global->max_channel), "Invalid channel %d",
724 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
725 (MSG_host_self(), channel));
728 /** \ingroup msg_gos_functions
730 * \brief Return the number of tasks waiting to be received on a \a
731 channel and sent by \a host.
733 * It takes two parameters.
734 * \param channel the channel on which the agent should be
735 listening. This value has to be >=0 and < than the maximal
736 number of channels fixed with MSG_set_channel_number().
737 * \param host the host that is to be watched.
738 * \return the number of tasks waiting to be received on \a channel
741 int MSG_task_probe_from_host(int channel, m_host_t host)
743 xbt_assert1((channel >= 0)
744 && (channel < msg_global->max_channel), "Invalid channel %d",
750 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
751 (MSG_host_self(), channel),
756 int MSG_task_listen_from_host(const char *alias, m_host_t host)
761 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias(alias),
765 /** \ingroup msg_gos_functions
766 * \brief Test whether there is a pending communication on a channel, and who sent it.
768 * It takes one parameter.
769 * \param channel the channel on which the agent should be
770 listening. This value has to be >=0 and < than the maximal
771 number of channels fixed with MSG_set_channel_number().
772 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
774 int MSG_task_probe_from(m_channel_t channel)
780 xbt_assert1((channel >= 0)
781 && (channel < msg_global->max_channel), "Invalid channel %d",
786 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
787 (MSG_host_self(), channel))))
790 return MSG_process_get_PID(task->simdata->sender);
793 int MSG_task_listen_from(const char *alias)
799 if (NULL == (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
802 return MSG_process_get_PID(task->simdata->sender);
805 /** \ingroup msg_gos_functions
806 * \brief Wait for at most \a max_duration second for a task reception
809 * \a PID is updated with the PID of the first process that triggered this event if any.
811 * It takes three parameters:
812 * \param channel the channel on which the agent should be
813 listening. This value has to be >=0 and < than the maximal.
814 number of channels fixed with MSG_set_channel_number().
815 * \param PID a memory location for storing an int.
816 * \param timeout the maximum time to wait for a task before
817 giving up. In the case of a reception, *\a PID will be updated
818 with the PID of the first process to send a task.
819 * \return #MSG_HOST_FAILURE if the host is shut down in the meantime
820 and #MSG_OK otherwise.
823 MSG_channel_select_from(m_channel_t channel, double timeout, int *PID)
826 simdata_host_t h_simdata = NULL;
830 msg_mailbox_t mailbox;
832 xbt_assert1((channel >= 0)
833 && (channel < msg_global->max_channel), "Invalid channel %d",
840 if (timeout == 0.0) {
841 *PID = MSG_task_probe_from(channel);
846 h_simdata = h->simdata;
848 mailbox = MSG_mailbox_get_by_channel(MSG_host_self(), channel);
850 while (MSG_mailbox_is_empty(mailbox)) {
857 SIMIX_mutex_lock(h_simdata->mutex);
859 xbt_assert1(!MSG_mailbox_get_cond(mailbox),
860 "A process is already blocked on this channel %d", channel);
862 cond = SIMIX_cond_init();
864 MSG_mailbox_set_cond(mailbox, cond);
867 SIMIX_cond_wait_timeout(cond, h_simdata->mutex, timeout);
869 SIMIX_cond_wait(cond, h_simdata->mutex);
872 SIMIX_cond_destroy(cond);
873 SIMIX_mutex_unlock(h_simdata->mutex);
875 if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
876 MSG_RETURN(MSG_HOST_FAILURE);
879 MSG_mailbox_set_cond(mailbox, NULL);
883 if (NULL == (t = MSG_mailbox_get_head(mailbox)))
888 *PID = MSG_process_get_PID(t->simdata->sender);
896 MSG_error_t MSG_alias_select_from(const char *alias, double timeout, int *PID)
899 simdata_host_t h_simdata = NULL;
903 msg_mailbox_t mailbox;
909 if (timeout == 0.0) {
910 *PID = MSG_task_listen_from(alias);
915 h_simdata = h->simdata;
917 DEBUG2("Probing on alias %s (%s)", alias, h->name);
919 mailbox = MSG_mailbox_get_by_alias(alias);
921 while (MSG_mailbox_is_empty(mailbox)) {
928 SIMIX_mutex_lock(h_simdata->mutex);
930 xbt_assert1(!MSG_mailbox_get_cond(mailbox),
931 "A process is already blocked on this alias %s", alias);
933 cond = SIMIX_cond_init();
935 MSG_mailbox_set_cond(mailbox, cond);
938 SIMIX_cond_wait_timeout(cond, h_simdata->mutex, timeout);
940 SIMIX_cond_wait(cond, h_simdata->mutex);
943 SIMIX_cond_destroy(cond);
944 SIMIX_mutex_unlock(h_simdata->mutex);
946 if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
947 MSG_RETURN(MSG_HOST_FAILURE);
950 MSG_mailbox_set_cond(mailbox, NULL);
954 if (NULL == (t = MSG_mailbox_get_head(mailbox)))
959 *PID = MSG_process_get_PID(t->simdata->sender);