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. */
8 #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_FATAL if \a task is not properly initialized and
37 MSG_error_t MSG_task_execute(m_task_t task)
39 simdata_task_t simdata = NULL;
40 m_process_t self = MSG_process_self();
43 simdata = task->simdata;
45 xbt_assert0(simdata->host_nb == 0,
46 "This is a parallel task. Go to hell.");
49 TRACE_msg_task_execute_start(task);
52 xbt_assert1((!simdata->compute) && (task->simdata->isused == 0),
53 "This task is executed somewhere else. Go fix your code! %d",
54 task->simdata->isused);
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);
66 SIMIX_req_host_execute(task->name, SIMIX_host_self(),
67 simdata->computation_amount);
68 SIMIX_req_host_execution_set_priority(simdata->compute, simdata->priority);
70 SIMIX_req_set_category(simdata->compute, task->category);
73 self->simdata->waiting_action = simdata->compute;
74 SIMIX_req_host_execution_wait(simdata->compute);
75 self->simdata->waiting_action = NULL;
79 DEBUG2("Execution task '%s' finished in state %d", task->name, SIMIX_req_host_execution_get_state(task->simdata->compute));
80 if (SIMIX_req_host_execution_get_state(task->simdata->compute) == SIMIX_DONE) {
81 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
82 SIMIX_req_host_execution_destroy(task->simdata->compute);
83 simdata->computation_amount = 0.0;
85 simdata->compute = NULL;
87 TRACE_msg_task_execute_end(task);
90 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
91 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
92 SIMIX_req_host_execution_destroy(task->simdata->compute);
94 simdata->compute = NULL;
96 TRACE_msg_task_execute_end(task);
98 MSG_RETURN(MSG_HOST_FAILURE);
100 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
101 SIMIX_req_host_execution_destroy(task->simdata->compute);
102 simdata->comm = NULL;
103 simdata->compute = NULL;
105 TRACE_msg_task_execute_end(task);
107 MSG_RETURN(MSG_TASK_CANCELLED);
111 /** \ingroup m_task_management
112 * \brief Creates a new #m_task_t (a parallel one....).
114 * A constructor for #m_task_t taking six arguments and returning the
115 corresponding object.
116 * \param name a name for the object. It is for user-level information
118 * \param host_nb the number of hosts implied in the parallel task.
119 * \param host_list an array of \p host_nb m_host_t.
120 * \param computation_amount an array of \p host_nb
121 doubles. computation_amount[i] is the total number of operations
122 that have to be performed on host_list[i].
123 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
124 * \param data a pointer to any data may want to attach to the new
125 object. It is for user-level information and can be NULL. It can
126 be retrieved with the function \ref MSG_task_get_data.
128 * \return The new corresponding object.
131 MSG_parallel_task_create(const char *name, int host_nb,
132 const m_host_t * host_list,
133 double *computation_amount,
134 double *communication_amount, void *data)
137 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
138 m_task_t task = xbt_new0(s_m_task_t, 1);
139 task->simdata = simdata;
142 task->name = xbt_strdup(name);
146 simdata->computation_amount = 0;
147 simdata->message_size = 0;
148 simdata->compute = NULL;
149 simdata->comm = NULL;
150 simdata->rate = -1.0;
152 simdata->sender = NULL;
153 simdata->receiver = NULL;
154 simdata->source = NULL;
156 simdata->host_nb = host_nb;
157 simdata->host_list = xbt_new0(smx_host_t, host_nb);
158 simdata->comp_amount = computation_amount;
159 simdata->comm_amount = communication_amount;
161 for (i = 0; i < host_nb; i++)
162 simdata->host_list[i] = host_list[i]->simdata->smx_host;
167 MSG_error_t MSG_parallel_task_execute(m_task_t task)
169 simdata_task_t simdata = NULL;
170 m_process_t self = MSG_process_self();
173 simdata = task->simdata;
175 xbt_assert0((!simdata->compute)
176 && (task->simdata->isused == 0),
177 "This task is executed somewhere else. Go fix your code!");
179 xbt_assert0(simdata->host_nb,
180 "This is not a parallel task. Go to hell.");
182 DEBUG1("Parallel computing on %s", MSG_process_self()->simdata->m_host->name);
187 SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
189 simdata->comp_amount,
190 simdata->comm_amount, 1.0, -1.0);
191 DEBUG1("Parallel execution action created: %p", simdata->compute);
193 self->simdata->waiting_action = simdata->compute;
194 SIMIX_req_host_execution_wait(simdata->compute);
195 self->simdata->waiting_action = NULL;
197 DEBUG2("Finished waiting for execution of action %p, state = %d", simdata->compute, SIMIX_req_host_execution_get_state(task->simdata->compute));
201 if (SIMIX_req_host_execution_get_state(task->simdata->compute) == SIMIX_DONE) {
202 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
203 SIMIX_req_host_execution_destroy(task->simdata->compute);
204 simdata->computation_amount = 0.0;
205 simdata->comm = NULL;
206 simdata->compute = NULL;
208 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
209 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
210 SIMIX_req_host_execution_destroy(task->simdata->compute);
211 simdata->comm = NULL;
212 simdata->compute = NULL;
213 MSG_RETURN(MSG_HOST_FAILURE);
215 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
216 SIMIX_req_host_execution_destroy(task->simdata->compute);
217 simdata->comm = NULL;
218 simdata->compute = NULL;
219 MSG_RETURN(MSG_TASK_CANCELLED);
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) {
250 if (SIMIX_req_host_get_state(SIMIX_host_self()) == SURF_RESOURCE_OFF) {
252 TRACE_msg_process_sleep_out(MSG_process_self());
254 MSG_RETURN(MSG_HOST_FAILURE);
258 TRACE_msg_process_sleep_out(MSG_process_self());
260 MSG_RETURN(MSG_HOST_FAILURE);
263 TRACE_msg_process_sleep_out(MSG_process_self());
268 /** \ingroup msg_gos_functions
269 * \brief Listen on \a channel and waits for receiving a task from \a host.
271 * It takes three parameters.
272 * \param task a memory location for storing a #m_task_t. It will
273 hold a task when this function will return. Thus \a task should not
274 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
275 those two condition does not hold, there will be a warning message.
276 * \param channel the channel on which the agent should be
277 listening. This value has to be >=0 and < than the maximal
278 number of channels fixed with MSG_set_channel_number().
279 * \param host the host that is to be watched.
280 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
281 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
284 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
286 return MSG_task_get_ext(task, channel, -1, host);
289 /** \ingroup msg_gos_functions
290 * \brief Listen on a channel and wait for receiving a task.
292 * It takes two parameters.
293 * \param task a memory location for storing a #m_task_t. It will
294 hold a task when this function will return. Thus \a task should not
295 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
296 those two condition does not hold, there will be a warning message.
297 * \param channel the channel on which the agent should be
298 listening. This value has to be >=0 and < than the maximal
299 number of channels fixed with MSG_set_channel_number().
300 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
301 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
303 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
305 return MSG_task_get_with_timeout(task, channel, -1);
308 /** \ingroup msg_gos_functions
309 * \brief Listen on a channel and wait for receiving a task with a timeout.
311 * It takes three parameters.
312 * \param task a memory location for storing a #m_task_t. It will
313 hold a task when this function will return. Thus \a task should not
314 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
315 those two condition does not hold, there will be a warning message.
316 * \param channel the channel on which the agent should be
317 listening. This value has to be >=0 and < than the maximal
318 number of channels fixed with MSG_set_channel_number().
319 * \param max_duration the maximum time to wait for a task before giving
320 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
321 will not be modified and will still be
322 equal to \c NULL when returning.
323 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
324 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
327 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
330 return MSG_task_get_ext(task, channel, max_duration, NULL);
333 /** \defgroup msg_gos_functions MSG Operating System Functions
334 * \brief This section describes the functions that can be used
335 * by an agent for handling some task.
339 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
342 xbt_assert1((channel >= 0)
343 && (channel < msg_global->max_channel), "Invalid channel %d",
347 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
348 (MSG_host_self(), channel), task, host,
353 MSG_task_receive_from_host(m_task_t * task, const char *alias,
356 return MSG_task_receive_ext(task, alias, -1, host);
359 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
361 return MSG_task_receive_with_timeout(task, alias, -1);
365 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
368 return MSG_task_receive_ext(task, alias, timeout, NULL);
372 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
376 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
378 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
382 /** \ingroup msg_gos_functions
383 * \brief Send a task on a channel.
385 * This function takes two parameter.
386 * \param task a #m_task_t to send on another location.
387 * \param alias the channel on which the agent should put this
388 task. This value has to be >=0 and < than the maximal number of
389 channels fixed with MSG_set_channel_number().
390 * \return the msg_comm_t communication.
392 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
394 simdata_task_t t_simdata = NULL;
395 m_process_t process = MSG_process_self();
396 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
400 /* FIXME: these functions are not tracable */
402 /* Prepare the task to send */
403 t_simdata = task->simdata;
404 t_simdata->sender = process;
405 t_simdata->source = MSG_host_self();
407 xbt_assert0(t_simdata->isused == 0,
408 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
411 msg_global->sent_msg++;
413 /* Send it by calling SIMIX network layer */
415 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
416 t_simdata->rate, task, sizeof(void *), NULL, NULL);
417 return t_simdata->comm;
420 /** \ingroup msg_gos_functions
421 * \brief Listen on a channel for receiving a task from an asynchronous communication.
423 * It takes two parameters.
424 * \param task a memory location for storing a #m_task_t.
425 * \param alias the channel on which the agent should be
426 listening. This value has to be >=0 and < than the maximal
427 number of channels fixed with MSG_set_channel_number().
428 * \return the msg_comm_t communication.
430 msg_comm_t MSG_task_irecv(m_task_t * task, const char *alias)
432 smx_rdv_t rdv = MSG_mailbox_get_by_alias(alias);
436 /* FIXME: these functions are not tracable */
439 xbt_assert0(task, "Null pointer for the task storage");
443 ("MSG_task_get() was asked to write in a non empty task struct.");
445 /* Try to receive it by calling SIMIX network layer */
446 return SIMIX_req_comm_irecv(rdv, task, NULL, NULL, NULL);
449 /** \ingroup msg_gos_functions
450 * \brief Returns whether a communication is finished.
451 * \param comm the communication to test
452 * \return TRUE if the communication is finished
453 * (but it may have failed, use MSG_comm_get_status() to know its status)
454 * or FALSE if the communication is not finished yet
455 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
457 int MSG_comm_test(msg_comm_t comm)
462 finished = SIMIX_req_comm_test(comm);
465 switch (e.category) {
481 /** \ingroup msg_gos_functions
482 * \brief This function checks if a communication is finished
483 * \param comms a vector of communications
484 * \return the position of the finished communication if any
485 * (but it may have failed, use MSG_comm_get_status() to know its status),
486 * or -1 if none is finished
488 int MSG_comm_testany(xbt_dynar_t comms)
491 int finished_index = -1;
493 finished_index = SIMIX_req_comm_testany(comms);
496 switch (e.category) {
501 finished_index = e.value;
509 return finished_index;
512 /** \ingroup msg_gos_functions
513 * \brief After received TRUE to MSG_comm_test(), the communication should be destroyed.
515 * It takes one parameter.
516 * \param comm the communication to destroy.
518 void MSG_comm_destroy(msg_comm_t comm)
520 if (SIMIX_req_comm_get_src_proc(comm) != SIMIX_process_self()
521 && MSG_comm_get_status(comm) == MSG_OK) {
523 task = (m_task_t) SIMIX_req_comm_get_src_buff(comm);
524 task->simdata->isused=0;
526 SIMIX_req_comm_destroy(comm);
529 /** \ingroup msg_gos_functions
530 * \brief Wait for the completion of a communication.
532 * It takes two parameters.
533 * \param comm the communication to wait.
534 * \param timeout Wait until the communication terminates or the timeout occurs
535 * \return MSG_error_t
537 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
540 MSG_error_t res = MSG_OK;
542 SIMIX_req_comm_wait(comm, timeout);
544 if (SIMIX_req_comm_get_src_proc(comm) != SIMIX_process_self()) {
546 task = (m_task_t) SIMIX_req_comm_get_src_buff(comm);
547 task->simdata->isused=0;
550 /* FIXME: these functions are not tracable */
553 switch (e.category) {
555 res = MSG_HOST_FAILURE;
558 res = MSG_TRANSFER_FAILURE;
571 /** \ingroup msg_gos_functions
572 * \brief This function is called by a sender and permit to wait for each communication
574 * It takes three parameters.
575 * \param comm a vector of communication
576 * \param nb_elem is the size of the comm vector
577 * \param timeout for each call of MSG_comm_wait
579 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
582 for (i = 0; i < nb_elem; i++) {
583 MSG_comm_wait(comm[i], timeout);
587 /** \ingroup msg_gos_functions
588 * \brief This function wait for the first completed communication
590 * It takes on parameter.
591 * \param comms a vector of communication
592 * \return the position of the completed communication from the xbt_dynar_t.
594 int MSG_comm_waitany(xbt_dynar_t comms)
597 int finished_index = -1;
599 finished_index = SIMIX_req_comm_waitany(comms);
602 switch (e.category) {
607 finished_index = e.value;
613 return finished_index;
617 * \ingroup msg_gos_functions
618 * \brief Returns the error (if any) that occured during a finished communication.
619 * \param comm a finished communication
620 * \return the status of the communication, or MSG_OK if the communication
621 * was successfully completed
623 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
626 e_smx_state_t smx_state = SIMIX_req_comm_get_state(comm);
631 result = MSG_TASK_CANCELLED;
635 case SIMIX_SRC_HOST_FAILURE:
636 case SIMIX_DST_HOST_FAILURE:
637 result = MSG_HOST_FAILURE;
640 case SIMIX_LINK_FAILURE:
641 result = MSG_TRANSFER_FAILURE;
644 case SIMIX_SRC_TIMEOUT:
645 case SIMIX_DST_TIMEOUT:
646 result = MSG_TIMEOUT;
656 m_task_t MSG_comm_get_task(msg_comm_t comm)
658 xbt_assert0(comm, "Invalid parameters");
659 return (m_task_t) SIMIX_req_comm_get_src_buff(comm);
662 /** \ingroup msg_gos_functions
663 * \brief Put a task on a channel of an host and waits for the end of the
666 * This function is used for describing the behavior of an agent. It
667 * takes three parameter.
668 * \param task a #m_task_t to send on another location. This task
669 will not be usable anymore when the function will return. There is
670 no automatic task duplication and you have to save your parameters
671 before calling this function. Tasks are unique and once it has been
672 sent to another location, you should not access it anymore. You do
673 not need to call MSG_task_destroy() but to avoid using, as an
674 effect of inattention, this task anymore, you definitely should
675 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
676 can be transfered iff it has been correctly created with
678 * \param dest the destination of the message
679 * \param channel the channel on which the agent should put this
680 task. This value has to be >=0 and < than the maximal number of
681 channels fixed with MSG_set_channel_number().
682 * \return #MSG_FATAL if \a task is not properly initialized and
683 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
684 * this function was called was shut down. Returns
685 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
686 * (network failure, dest failure)
688 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
690 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
693 /** \ingroup msg_gos_functions
694 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
700 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
703 task->simdata->rate = maxrate;
704 return MSG_task_put(task, dest, channel);
707 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
708 * host (with a timeout on the waiting of the destination host) and
709 * waits for the end of the transmission.
711 * This function is used for describing the behavior of an agent. It
712 * takes four parameter.
713 * \param task a #m_task_t to send on another location. This task
714 will not be usable anymore when the function will return. There is
715 no automatic task duplication and you have to save your parameters
716 before calling this function. Tasks are unique and once it has been
717 sent to another location, you should not access it anymore. You do
718 not need to call MSG_task_destroy() but to avoid using, as an
719 effect of inattention, this task anymore, you definitely should
720 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
721 can be transfered iff it has been correctly created with
723 * \param dest the destination of the message
724 * \param channel the channel on which the agent should put this
725 task. This value has to be >=0 and < than the maximal number of
726 channels fixed with MSG_set_channel_number().
727 * \param timeout the maximum time to wait for a task before giving
728 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
730 * \return #MSG_FATAL if \a task is not properly initialized and
731 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
732 this function was called was shut down. Returns
733 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
734 (network failure, dest failure, timeout...)
737 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
738 m_channel_t channel, double timeout)
740 xbt_assert1((channel >= 0)
741 && (channel < msg_global->max_channel), "Invalid channel %d",
744 DEBUG1("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
746 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
747 (dest, channel), task, timeout);
750 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
752 DEBUG1("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
753 return MSG_task_send_with_timeout(task, alias, -1);
758 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
760 task->simdata->rate = maxrate;
761 return MSG_task_send(task, alias);
766 MSG_task_send_with_timeout(m_task_t task, const char *alias,
769 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
773 int MSG_task_listen(const char *alias)
777 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
780 /** \ingroup msg_gos_functions
781 * \brief Test whether there is a pending communication on a channel.
783 * It takes one parameter.
784 * \param channel the channel on which the agent should be
785 listening. This value has to be >=0 and < than the maximal
786 number of channels fixed with MSG_set_channel_number().
787 * \return 1 if there is a pending communication and 0 otherwise
789 int MSG_task_Iprobe(m_channel_t channel)
791 xbt_assert1((channel >= 0)
792 && (channel < msg_global->max_channel), "Invalid channel %d",
798 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
799 (MSG_host_self(), channel));
802 /** \ingroup msg_gos_functions
804 * \brief Return the number of tasks waiting to be received on a \a
805 channel and sent by \a host.
807 * It takes two parameters.
808 * \param channel the channel on which the agent should be
809 listening. This value has to be >=0 and < than the maximal
810 number of channels fixed with MSG_set_channel_number().
811 * \param host the host that is to be watched.
812 * \return the number of tasks waiting to be received on \a channel
815 int MSG_task_probe_from_host(int channel, m_host_t host)
817 xbt_assert1((channel >= 0)
818 && (channel < msg_global->max_channel), "Invalid channel %d",
824 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
825 (MSG_host_self(), channel),
830 int MSG_task_listen_from_host(const char *alias, m_host_t host)
835 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
839 /** \ingroup msg_gos_functions
840 * \brief Test whether there is a pending communication on a channel, and who sent it.
842 * It takes one parameter.
843 * \param channel the channel on which the agent should be
844 listening. This value has to be >=0 and < than the maximal
845 number of channels fixed with MSG_set_channel_number().
846 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
848 int MSG_task_probe_from(m_channel_t channel)
854 xbt_assert1((channel >= 0)
855 && (channel < msg_global->max_channel), "Invalid channel %d",
860 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
861 (MSG_host_self(), channel))))
864 return MSG_process_get_PID(task->simdata->sender);
867 int MSG_task_listen_from(const char *alias)
874 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
877 return MSG_process_get_PID(task->simdata->sender);