1 /* Copyright (c) 2004-2012. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "msg_private.h"
7 #include "msg_mailbox.h"
10 #include "xbt/sysdep.h"
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
13 "Logging specific to MSG (gos)");
15 /** \ingroup msg_task_usage
16 * \brief Executes a task and waits for its termination.
18 * This function is used for describing the behavior of a process. It
19 * takes only one parameter.
20 * \param task a #m_task_t to execute on the location on which the process is running.
21 * \return #MSG_OK if the task was successfully completed, #MSG_TASK_CANCELED
22 * or #MSG_HOST_FAILURE otherwise
24 MSG_error_t MSG_task_execute(m_task_t task)
26 return MSG_parallel_task_execute(task);
29 /** \ingroup m_task_management
30 * \brief Creates a new #m_task_t (a parallel one....).
32 * A constructor for #m_task_t taking six arguments and returning the
34 * \param name a name for the object. It is for user-level information
36 * \param host_nb the number of hosts implied in the parallel task.
37 * \param host_list an array of \p host_nb m_host_t.
38 * \param computation_amount an array of \p host_nb
39 doubles. computation_amount[i] is the total number of operations
40 that have to be performed on host_list[i].
41 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
42 * \param data a pointer to any data may want to attach to the new
43 object. It is for user-level information and can be NULL. It can
44 be retrieved with the function \ref MSG_task_get_data.
46 * \return The new corresponding object.
49 MSG_parallel_task_create(const char *name, int host_nb,
50 const m_host_t * host_list,
51 double *computation_amount,
52 double *communication_amount, void *data)
55 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
56 m_task_t task = xbt_new0(s_m_task_t, 1);
57 task->simdata = simdata;
60 task->name = xbt_strdup(name);
64 simdata->computation_amount = 0;
65 simdata->message_size = 0;
66 simdata->compute = NULL;
70 simdata->sender = NULL;
71 simdata->receiver = NULL;
72 simdata->source = NULL;
74 simdata->host_nb = host_nb;
75 simdata->host_list = xbt_new0(smx_host_t, host_nb);
76 simdata->comp_amount = computation_amount;
77 simdata->comm_amount = communication_amount;
79 for (i = 0; i < host_nb; i++)
80 simdata->host_list[i] = host_list[i]->smx_host;
85 /** \ingroup msg_task_usage
86 * \brief Executes a parallel task and waits for its termination.
88 * \param task a #m_task_t to execute on the location on which the process is running.
90 * \return #MSG_OK if the task was successfully completed, #MSG_TASK_CANCELED
91 * or #MSG_HOST_FAILURE otherwise
93 MSG_error_t MSG_parallel_task_execute(m_task_t task)
96 simdata_task_t simdata = NULL;
97 simdata_process_t p_simdata;
98 e_smx_state_t comp_state;
99 MSG_error_t status = MSG_OK;
101 simdata = task->simdata;
102 m_process_t self = SIMIX_process_self();
103 p_simdata = SIMIX_process_self_get_data(self);
106 TRACE_msg_task_execute_start(task);
109 xbt_assert((!simdata->compute) && (task->simdata->isused == 0),
110 "This task is executed somewhere else. Go fix your code! %d",
111 task->simdata->isused);
113 XBT_DEBUG("Computing on %s", MSG_process_get_name(MSG_process_self()));
115 if (simdata->computation_amount == 0 && !simdata->host_nb) {
117 TRACE_msg_task_execute_end(task);
125 simcall_set_category(simdata->compute, task->category);
130 if (simdata->host_nb > 0) {
131 simdata->compute = simcall_host_parallel_execute(task->name, simdata->host_nb,
133 simdata->comp_amount,
134 simdata->comm_amount, 1.0, -1.0);
135 XBT_DEBUG("Parallel execution action created: %p", simdata->compute);
139 simcall_host_execute(task->name, p_simdata->m_host->smx_host,
140 simdata->computation_amount,
144 p_simdata->waiting_action = simdata->compute;
145 comp_state = simcall_host_execution_wait(simdata->compute);
147 p_simdata->waiting_action = NULL;
151 XBT_DEBUG("Execution task '%s' finished in state %d", task->name, (int)comp_state);
154 switch (e.category) {
156 status = MSG_HOST_FAILURE;
160 TRACE_msg_task_execute_end(task);
162 status = MSG_TASK_CANCELED;
169 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
170 simdata->computation_amount = 0.0;
171 simdata->comm = NULL;
172 simdata->compute = NULL;
174 TRACE_msg_task_execute_end(task);
181 /** \ingroup msg_task_usage
182 * \brief Sleep for the specified number of seconds
184 * Makes the current process sleep until \a time seconds have elapsed.
186 * \param nb_sec a number of second
188 MSG_error_t MSG_process_sleep(double nb_sec)
191 MSG_error_t status = MSG_OK;
192 /*m_process_t proc = MSG_process_self();*/
195 TRACE_msg_process_sleep_in(MSG_process_self());
198 /* create action to sleep */
200 /*proc->simdata->waiting_action = act_sleep;
202 FIXME: check if not setting the waiting_action breaks something on msg
204 proc->simdata->waiting_action = NULL;*/
207 simcall_process_sleep(nb_sec);
210 switch (e.category) {
213 TRACE_msg_process_sleep_out(MSG_process_self());
215 status = MSG_HOST_FAILURE;
224 TRACE_msg_process_sleep_out(MSG_process_self());
229 /** \ingroup msg_task_usage
230 * \brief Deprecated function that used to receive a task from a mailbox from a specific host.
232 * Sorry, this function is not supported anymore. That wouldn't be
233 * impossible to reimplement it, but we are lacking the time to do so ourselves.
234 * If you need this functionality, you can either:
236 * - implement the buffering mechanism on the user-level by queuing all messages
237 * received in the mailbox that do not match your expectation
238 * - change your application logic to leverage the mailboxes features. For example,
239 * if you have A receiving messages from B and C, you could have A waiting on
240 * mailbox "A" most of the time, but on "A#B" when it's waiting for specific
241 * messages from B and "A#C" when waiting for messages from C. You could even get A
242 * sometime waiting on all these mailboxes using @ref MSG_comm_waitany. You can find
243 * an example of use of this function in the @ref MSG_examples section.
244 * - Provide a proper patch to implement this functionality back in MSG. That wouldn't be
245 * very difficult actually. Check the function @ref MSG_mailbox_get_task_ext. During its call to
246 * simcall_comm_recv(), the 5th argument, match_fun, is NULL. Create a function that filters
247 * messages according to the host (that you will pass as sixth argument to simcall_comm_recv()
248 * and that your filtering function will receive as first parameter, and then, the filter could
249 * simply compare the host names, for example. After sufficient testing, provide an example that
250 * we could add to the distribution, and your first contribution to SimGrid is ready. Thanks in advance.
252 * \param task a memory location for storing a #m_task_t.
253 * \param alias name of the mailbox to receive the task from
254 * \param host a #m_host_t host from where the task was sent
257 * #MSG_OK if the task was successfully received,
258 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
261 MSG_task_receive_from_host(m_task_t * task, const char *alias,
264 return MSG_task_receive_ext(task, alias, -1, host);
267 /** \ingroup msg_task_usage
268 * \brief Receives a task from a mailbox.
270 * This is a blocking function, the execution flow will be blocked
271 * until the task is received. See #MSG_task_irecv
272 * for receiving tasks asynchronously.
274 * \param task a memory location for storing a #m_task_t.
275 * \param alias name of the mailbox to receive the task from
278 * #MSG_OK if the task was successfully received,
279 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
281 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
283 return MSG_task_receive_with_timeout(task, alias, -1);
286 /** \ingroup msg_task_usage
287 * \brief Receives a task from a mailbox with a given timeout.
289 * This is a blocking function with a timeout, the execution flow will be blocked
290 * until the task is received or the timeout is achieved. See #MSG_task_irecv
291 * for receiving tasks asynchronously. You can provide a -1 timeout
292 * to obtain an infinite timeout.
294 * \param task a memory location for storing a #m_task_t.
295 * \param alias name of the mailbox to receive the task from
296 * \param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_receive)
299 * #MSG_OK if the task was successfully received,
300 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
303 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
306 return MSG_task_receive_ext(task, alias, timeout, NULL);
309 /** \ingroup msg_task_usage
310 * \brief Receives a task from a mailbox from a specific host with a given timeout.
312 * This is a blocking function with a timeout, the execution flow will be blocked
313 * until the task is received or the timeout is achieved. See #MSG_task_irecv
314 * for receiving tasks asynchronously. You can provide a -1 timeout
315 * to obtain an infinite timeout.
317 * \param task a memory location for storing a #m_task_t.
318 * \param alias name of the mailbox to receive the task from
319 * \param timeout is the maximum wait time for completion (provide -1 for no timeout)
320 * \param host a #m_host_t host from where the task was sent
323 * #MSG_OK if the task was successfully received,
324 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
327 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
331 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
333 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
337 /** \ingroup msg_task_usage
338 * \brief Sends a task on a mailbox.
340 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
341 * to end the communication.
343 * \param task a #m_task_t to send on another location.
344 * \param alias name of the mailbox to sent the task to
345 * \return the msg_comm_t communication created
347 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
349 return MSG_task_isend_with_matching(task,alias,NULL,NULL);
352 /** \ingroup msg_task_usage
353 * \brief Sends a task on a mailbox, with support for matching requests
355 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
356 * to end the communication.
358 * \param task a #m_task_t to send on another location.
359 * \param alias name of the mailbox to sent the task to
360 * \param match_fun boolean function which parameters are:
361 * - match_data_provided_here
362 * - match_data_provided_by_other_side_if_any
363 * - the_smx_action_describing_the_other_side
364 * \param match_data user provided data passed to match_fun
365 * \return the msg_comm_t communication created
367 XBT_INLINE msg_comm_t MSG_task_isend_with_matching(m_task_t task, const char *alias,
368 int (*match_fun)(void*,void*, smx_action_t),
371 simdata_task_t t_simdata = NULL;
372 m_process_t process = MSG_process_self();
373 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
375 /* FIXME: these functions are not traceable */
377 /* Prepare the task to send */
378 t_simdata = task->simdata;
379 t_simdata->sender = process;
380 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
382 xbt_assert(t_simdata->isused == 0,
383 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
385 t_simdata->isused = 1;
386 t_simdata->comm = NULL;
387 msg_global->sent_msg++;
389 /* Send it by calling SIMIX network layer */
390 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
391 comm->task_sent = task;
392 comm->task_received = NULL;
393 comm->status = MSG_OK;
395 simcall_comm_isend(mailbox, t_simdata->message_size,
396 t_simdata->rate, task, sizeof(void *), match_fun, NULL, match_data, 0);
397 t_simdata->comm = comm->s_comm; /* FIXME: is the field t_simdata->comm still useful? */
402 /** \ingroup msg_task_usage
403 * \brief Sends a task on a mailbox.
405 * This is a non blocking detached send function.
406 * Think of it as a best effort send. Keep in mind that the third parameter
407 * is only called if the communication fails. If the communication does work,
408 * it is responsibility of the receiver code to free anything related to
409 * the task, as usual. More details on this can be obtained on
410 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
411 * in the SimGrid-user mailing list archive.
413 * \param task a #m_task_t to send on another location.
414 * \param alias name of the mailbox to sent the task to
415 * \param cleanup a function to destroy the task if the
416 * communication fails, e.g. MSG_task_destroy
417 * (if NULL, no function will be called)
419 void MSG_task_dsend(m_task_t task, const char *alias, void_f_pvoid_t cleanup)
421 simdata_task_t t_simdata = NULL;
422 m_process_t process = MSG_process_self();
423 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
425 /* FIXME: these functions are not traceable */
427 /* Prepare the task to send */
428 t_simdata = task->simdata;
429 t_simdata->sender = process;
430 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
432 xbt_assert(t_simdata->isused == 0,
433 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
435 t_simdata->isused = 1;
436 t_simdata->comm = NULL;
437 msg_global->sent_msg++;
439 /* Send it by calling SIMIX network layer */
440 smx_action_t comm = simcall_comm_isend(mailbox, t_simdata->message_size,
441 t_simdata->rate, task, sizeof(void *), NULL, cleanup, NULL, 1);
442 t_simdata->comm = comm;
445 /** \ingroup msg_task_usage
446 * \brief Starts listening for receiving a task from an asynchronous communication.
448 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
449 * to end the communication.
451 * \param task a memory location for storing a #m_task_t. has to be valid until the end of the communication.
452 * \param name of the mailbox to receive the task on
453 * \return the msg_comm_t communication created
455 msg_comm_t MSG_task_irecv(m_task_t *task, const char *name)
457 smx_rdv_t rdv = MSG_mailbox_get_by_alias(name);
459 /* FIXME: these functions are not traceable */
462 xbt_assert(task, "Null pointer for the task storage");
466 ("MSG_task_irecv() was asked to write in a non empty task struct.");
468 /* Try to receive it by calling SIMIX network layer */
469 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
470 comm->task_sent = NULL;
471 comm->task_received = task;
472 comm->status = MSG_OK;
473 comm->s_comm = simcall_comm_irecv(rdv, task, NULL, NULL, NULL);
478 /** \ingroup msg_task_usage
479 * \brief Checks whether a communication is done, and if yes, finalizes it.
480 * \param comm the communication to test
481 * \return TRUE if the communication is finished
482 * (but it may have failed, use MSG_comm_get_status() to know its status)
483 * or FALSE if the communication is not finished yet
484 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
486 int MSG_comm_test(msg_comm_t comm)
491 finished = simcall_comm_test(comm->s_comm);
493 if (finished && comm->task_received != NULL) {
494 /* I am the receiver */
495 (*comm->task_received)->simdata->isused = 0;
499 switch (e.category) {
502 comm->status = MSG_HOST_FAILURE;
507 comm->status = MSG_TRANSFER_FAILURE;
512 comm->status = MSG_TIMEOUT;
525 /** \ingroup msg_task_usage
526 * \brief This function checks if a communication is finished.
527 * \param comms a vector of communications
528 * \return the position of the finished communication if any
529 * (but it may have failed, use MSG_comm_get_status() to know its status),
530 * or -1 if none is finished
532 int MSG_comm_testany(xbt_dynar_t comms)
535 int finished_index = -1;
537 /* create the equivalent dynar with SIMIX objects */
538 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
541 xbt_dynar_foreach(comms, cursor, comm) {
542 xbt_dynar_push(s_comms, &comm->s_comm);
545 MSG_error_t status = MSG_OK;
547 finished_index = simcall_comm_testany(s_comms);
550 switch (e.category) {
553 finished_index = e.value;
554 status = MSG_HOST_FAILURE;
558 finished_index = e.value;
559 status = MSG_TRANSFER_FAILURE;
563 finished_index = e.value;
564 status = MSG_TIMEOUT;
572 xbt_dynar_free(&s_comms);
574 if (finished_index != -1) {
575 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
576 /* the communication is finished */
577 comm->status = status;
579 if (status == MSG_OK && comm->task_received != NULL) {
580 /* I am the receiver */
581 (*comm->task_received)->simdata->isused = 0;
585 return finished_index;
588 /** \ingroup msg_task_usage
589 * \brief Destroys a communication.
590 * \param comm the communication to destroy.
592 void MSG_comm_destroy(msg_comm_t comm)
597 /** \ingroup msg_task_usage
598 * \brief Wait for the completion of a communication.
600 * It takes two parameters.
601 * \param comm the communication to wait.
602 * \param timeout Wait until the communication terminates or the timeout
603 * occurs. You can provide a -1 timeout to obtain an infinite timeout.
604 * \return MSG_error_t
606 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
610 simcall_comm_wait(comm->s_comm, timeout);
612 if (comm->task_received != NULL) {
613 /* I am the receiver */
614 (*comm->task_received)->simdata->isused = 0;
617 /* FIXME: these functions are not traceable */
620 switch (e.category) {
622 comm->status = MSG_HOST_FAILURE;
625 comm->status = MSG_TRANSFER_FAILURE;
628 comm->status = MSG_TIMEOUT;
639 /** \ingroup msg_task_usage
640 * \brief This function is called by a sender and permit to wait for each communication
642 * \param comm a vector of communication
643 * \param nb_elem is the size of the comm vector
644 * \param timeout for each call of MSG_comm_wait
646 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
649 for (i = 0; i < nb_elem; i++) {
650 MSG_comm_wait(comm[i], timeout);
654 /** \ingroup msg_task_usage
655 * \brief This function waits for the first communication finished in a list.
656 * \param comms a vector of communications
657 * \return the position of the first finished communication
658 * (but it may have failed, use MSG_comm_get_status() to know its status)
660 int MSG_comm_waitany(xbt_dynar_t comms)
663 int finished_index = -1;
665 /* create the equivalent dynar with SIMIX objects */
666 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
669 xbt_dynar_foreach(comms, cursor, comm) {
670 xbt_dynar_push(s_comms, &comm->s_comm);
673 MSG_error_t status = MSG_OK;
675 finished_index = simcall_comm_waitany(s_comms);
678 switch (e.category) {
681 finished_index = e.value;
682 status = MSG_HOST_FAILURE;
686 finished_index = e.value;
687 status = MSG_TRANSFER_FAILURE;
691 finished_index = e.value;
692 status = MSG_TIMEOUT;
701 xbt_assert(finished_index != -1, "WaitAny returned -1");
702 xbt_dynar_free(&s_comms);
704 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
705 /* the communication is finished */
706 comm->status = status;
708 if (comm->task_received != NULL) {
709 /* I am the receiver */
710 (*comm->task_received)->simdata->isused = 0;
713 return finished_index;
717 * \ingroup msg_task_usage
718 * \brief Returns the error (if any) that occured during a finished communication.
719 * \param comm a finished communication
720 * \return the status of the communication, or #MSG_OK if no error occured
721 * during the communication
723 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
728 /** \ingroup msg_task_usage
729 * \brief Get a task (#m_task_t) from a communication
731 * \param comm the communication where to get the task
732 * \return the task from the communication
734 m_task_t MSG_comm_get_task(msg_comm_t comm)
736 xbt_assert(comm, "Invalid parameter");
738 return comm->task_received ? *comm->task_received : comm->task_sent;
742 * \brief This function is called by SIMIX to copy the data of a comm.
743 * \param comm the comm
744 * \param buff the data copied
745 * \param buff_size size of the buffer
747 void MSG_comm_copy_data_from_SIMIX(smx_action_t comm, void* buff, size_t buff_size) {
750 SIMIX_comm_copy_pointer_callback(comm, buff, buff_size);
752 // notify the user callback if any
753 if (msg_global->task_copy_callback) {
754 m_task_t task = buff;
755 msg_global->task_copy_callback(task,
756 simcall_comm_get_src_proc(comm), simcall_comm_get_dst_proc(comm));
760 /** \ingroup msg_task_usage
761 * \brief Sends a task to a mailbox
763 * This is a blocking function, the execution flow will be blocked
764 * until the task is sent (and received in the other side if #MSG_task_receive is used).
765 * See #MSG_task_isend for sending tasks asynchronously.
767 * \param task the task to be sent
768 * \param alias the mailbox name to where the task is sent
770 * \return Returns #MSG_OK if the task was successfully sent,
771 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
773 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
775 XBT_DEBUG("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
776 return MSG_task_send_with_timeout(task, alias, -1);
779 /** \ingroup msg_task_usage
780 * \brief Sends a task to a mailbox with a maximum rate
782 * This is a blocking function, the execution flow will be blocked
783 * until the task is sent. The maxrate parameter allows the application
784 * to limit the bandwidth utilization of network links when sending the task.
786 * \param task the task to be sent
787 * \param alias the mailbox name to where the task is sent
788 * \param maxrate the maximum communication rate for sending this task
790 * \return Returns #MSG_OK if the task was successfully sent,
791 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
794 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
796 task->simdata->rate = maxrate;
797 return MSG_task_send(task, alias);
800 /** \ingroup msg_task_usage
801 * \brief Sends a task to a mailbox with a timeout
803 * This is a blocking function, the execution flow will be blocked
804 * until the task is sent or the timeout is achieved.
806 * \param task the task to be sent
807 * \param alias the mailbox name to where the task is sent
808 * \param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_send)
810 * \return Returns #MSG_OK if the task was successfully sent,
811 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
814 MSG_task_send_with_timeout(m_task_t task, const char *alias,
817 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
821 /** \ingroup msg_task_usage
822 * \brief Check if there is a communication going on in a mailbox.
824 * \param alias the name of the mailbox to be considered
826 * \return Returns 1 if there is a communication, 0 otherwise
828 int MSG_task_listen(const char *alias)
830 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
833 /** \ingroup msg_task_usage
834 * \brief Check the number of communication actions of a given host pending in a mailbox.
836 * \param alias the name of the mailbox to be considered
837 * \param host the host to check for communication
839 * \return Returns the number of pending communication actions of the host in the
840 * given mailbox, 0 if there is no pending communication actions.
843 int MSG_task_listen_from_host(const char *alias, m_host_t host)
846 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
850 /** \ingroup msg_task_usage
851 * \brief Look if there is a communication on a mailbox and return the
852 * PID of the sender process.
854 * \param alias the name of the mailbox to be considered
856 * \return Returns the PID of sender process,
857 * -1 if there is no communication in the mailbox.
859 int MSG_task_listen_from(const char *alias)
864 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
867 return MSG_process_get_PID(task->simdata->sender);
870 /** \ingroup msg_task_usage
871 * \brief Sets the tracing category of a task.
873 * This function should be called after the creation of
874 * a MSG task, to define the category of that task. The
875 * first parameter task must contain a task that was
876 * created with the function #MSG_task_create. The second
877 * parameter category must contain a category that was
878 * previously declared with the function #TRACE_category
879 * (or with #TRACE_category_with_color).
881 * See \ref tracing_tracing for details on how to trace
882 * the (categorized) resource utilization.
884 * \param task the task that is going to be categorized
885 * \param category the name of the category to be associated to the task
887 * \see MSG_task_get_category, TRACE_category, TRACE_category_with_color
889 void MSG_task_set_category (m_task_t task, const char *category)
892 TRACE_msg_set_task_category (task, category);
896 /** \ingroup msg_task_usage
898 * \brief Gets the current tracing category of a task.
900 * \param task the task to be considered
902 * \see MSG_task_set_category
904 * \return Returns the name of the tracing category of the given task, NULL otherwise
906 const char *MSG_task_get_category (m_task_t task)
909 return task->category;
915 #ifdef MSG_USE_DEPRECATED
916 /** \ingroup msg_deprecated_functions
918 * \brief Return the last value returned by a MSG function (except
921 MSG_error_t MSG_get_errno(void)
923 return PROCESS_GET_ERRNO();
926 /** \ingroup msg_deprecated_functions
927 * \brief Put a task on a channel of an host and waits for the end of the
930 * This function is used for describing the behavior of a process. It
931 * takes three parameter.
932 * \param task a #m_task_t to send on another location. This task
933 will not be usable anymore when the function will return. There is
934 no automatic task duplication and you have to save your parameters
935 before calling this function. Tasks are unique and once it has been
936 sent to another location, you should not access it anymore. You do
937 not need to call MSG_task_destroy() but to avoid using, as an
938 effect of inattention, this task anymore, you definitely should
939 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
940 can be transfered iff it has been correctly created with
942 * \param dest the destination of the message
943 * \param channel the channel on which the process should put this
944 task. This value has to be >=0 and < than the maximal number of
945 channels fixed with MSG_set_channel_number().
946 * \return #MSG_HOST_FAILURE if the host on which
947 * this function was called was shut down,
948 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
949 * (network failure, dest failure) or #MSG_OK if it succeeded.
951 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
953 XBT_WARN("DEPRECATED! Now use MSG_task_send");
954 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
957 /** \ingroup msg_deprecated_functions
958 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
964 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
967 XBT_WARN("DEPRECATED! Now use MSG_task_send_bounded");
968 task->simdata->rate = maxrate;
969 return MSG_task_put(task, dest, channel);
972 /** \ingroup msg_deprecated_functions
974 * \brief Put a task on a channel of an
975 * host (with a timeout on the waiting of the destination host) and
976 * waits for the end of the transmission.
978 * This function is used for describing the behavior of a process. It
979 * takes four parameter.
980 * \param task a #m_task_t to send on another location. This task
981 will not be usable anymore when the function will return. There is
982 no automatic task duplication and you have to save your parameters
983 before calling this function. Tasks are unique and once it has been
984 sent to another location, you should not access it anymore. You do
985 not need to call MSG_task_destroy() but to avoid using, as an
986 effect of inattention, this task anymore, you definitely should
987 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
988 can be transfered iff it has been correctly created with
990 * \param dest the destination of the message
991 * \param channel the channel on which the process should put this
992 task. This value has to be >=0 and < than the maximal number of
993 channels fixed with MSG_set_channel_number().
994 * \param timeout the maximum time to wait for a task before giving
995 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
997 * \return #MSG_HOST_FAILURE if the host on which
998 this function was called was shut down,
999 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
1000 (network failure, dest failure, timeout...) or #MSG_OK if the communication succeeded.
1003 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
1004 m_channel_t channel, double timeout)
1006 XBT_WARN("DEPRECATED! Now use MSG_task_send_with_timeout");
1007 xbt_assert((channel >= 0)
1008 && (channel < msg_global->max_channel), "Invalid channel %d",
1011 XBT_DEBUG("MSG_task_put_with_timout: Trying to send a task to '%s'", SIMIX_host_get_name(dest->smx_host));
1013 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
1014 (dest, channel), task, timeout);
1017 /** \ingroup msg_deprecated_functions
1018 * \brief Test whether there is a pending communication on a channel, and who sent it.
1020 * It takes one parameter.
1021 * \param channel the channel on which the process should be
1022 listening. This value has to be >=0 and < than the maximal
1023 number of channels fixed with MSG_set_channel_number().
1024 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
1026 int MSG_task_probe_from(m_channel_t channel)
1028 XBT_WARN("DEPRECATED! Now use MSG_task_listen_from");
1031 xbt_assert((channel >= 0)
1032 && (channel < msg_global->max_channel), "Invalid channel %d",
1037 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
1038 (MSG_host_self(), channel))))
1041 return MSG_process_get_PID(task->simdata->sender);
1044 /** \ingroup msg_deprecated_functions
1045 * \brief Test whether there is a pending communication on a channel.
1047 * It takes one parameter.
1048 * \param channel the channel on which the process should be
1049 listening. This value has to be >=0 and < than the maximal
1050 number of channels fixed with MSG_set_channel_number().
1051 * \return 1 if there is a pending communication and 0 otherwise
1053 int MSG_task_Iprobe(m_channel_t channel)
1055 XBT_WARN("DEPRECATED!");
1056 xbt_assert((channel >= 0)
1057 && (channel < msg_global->max_channel), "Invalid channel %d",
1061 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
1062 (MSG_host_self(), channel));
1065 /** \ingroup msg_deprecated_functions
1067 * \brief Return the number of tasks waiting to be received on a \a
1068 channel and sent by \a host.
1070 * It takes two parameters.
1071 * \param channel the channel on which the process should be
1072 listening. This value has to be >=0 and < than the maximal
1073 number of channels fixed with MSG_set_channel_number().
1074 * \param host the host that is to be watched.
1075 * \return the number of tasks waiting to be received on \a channel
1076 and sent by \a host.
1078 int MSG_task_probe_from_host(int channel, m_host_t host)
1080 XBT_WARN("DEPRECATED! Now use MSG_task_listen_from_host");
1081 xbt_assert((channel >= 0)
1082 && (channel < msg_global->max_channel), "Invalid channel %d",
1086 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
1087 (MSG_host_self(), channel),
1092 /** \ingroup msg_deprecated_functions
1093 * \brief Listen on \a channel and waits for receiving a task from \a host.
1095 * It takes three parameters.
1096 * \param task a memory location for storing a #m_task_t. It will
1097 hold a task when this function will return. Thus \a task should not
1098 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
1099 those two condition does not hold, there will be a warning message.
1100 * \param channel the channel on which the process should be
1101 listening. This value has to be >=0 and < than the maximal
1102 number of channels fixed with MSG_set_channel_number().
1103 * \param host the host that is to be watched.
1104 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
1107 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
1109 XBT_WARN("DEPRECATED! Now use MSG_task_receive_from_host");
1110 return MSG_task_get_ext(task, channel, -1, host);
1113 /** \ingroup msg_deprecated_functions
1114 * \brief Listen on a channel and wait for receiving a task.
1116 * It takes two parameters.
1117 * \param task a memory location for storing a #m_task_t. It will
1118 hold a task when this function will return. Thus \a task should not
1119 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
1120 those two condition does not hold, there will be a warning message.
1121 * \param channel the channel on which the process should be
1122 listening. This value has to be >=0 and < than the maximal
1123 number of channels fixed with MSG_set_channel_number().
1124 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
1126 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
1128 XBT_WARN("DEPRECATED! Now use MSG_task_receive");
1129 return MSG_task_get_with_timeout(task, channel, -1);
1132 /** \ingroup msg_deprecated_functions
1133 * \brief Listen on a channel and wait for receiving a task with a timeout.
1135 * It takes three parameters.
1136 * \param task a memory location for storing a #m_task_t. It will
1137 hold a task when this function will return. Thus \a task should not
1138 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
1139 those two condition does not hold, there will be a warning message.
1140 * \param channel the channel on which the process should be
1141 listening. This value has to be >=0 and < than the maximal
1142 number of channels fixed with MSG_set_channel_number().
1143 * \param max_duration the maximum time to wait for a task before giving
1144 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
1145 will not be modified and will still be
1146 equal to \c NULL when returning.
1147 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
1150 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
1151 double max_duration)
1153 XBT_WARN("DEPRECATED! Now use MSG_task_receive_with_timeout");
1154 return MSG_task_get_ext(task, channel, max_duration, NULL);
1158 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
1161 XBT_WARN("DEPRECATED! Now use MSG_task_receive_ext");
1162 xbt_assert((channel >= 0)
1163 && (channel < msg_global->max_channel), "Invalid channel %d",
1167 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
1168 (MSG_host_self(), channel), task, host,