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 = task->simdata;
97 m_process_t self = SIMIX_process_self();
98 simdata_process_t p_simdata = SIMIX_process_self_get_data(self);
99 e_smx_state_t comp_state;
100 MSG_error_t status = MSG_OK;
103 TRACE_msg_task_execute_start(task);
106 xbt_assert((!simdata->compute) && (task->simdata->isused == 0),
107 "This task is executed somewhere else. Go fix your code! %d",
108 task->simdata->isused);
110 XBT_DEBUG("Computing on %s", MSG_process_get_name(MSG_process_self()));
112 if (simdata->computation_amount == 0 && !simdata->host_nb) {
114 TRACE_msg_task_execute_end(task);
124 if (simdata->host_nb > 0) {
125 simdata->compute = simcall_host_parallel_execute(task->name,
128 simdata->comp_amount,
129 simdata->comm_amount,
131 XBT_DEBUG("Parallel execution action created: %p", simdata->compute);
133 simdata->compute = simcall_host_execute(task->name,
134 p_simdata->m_host->smx_host,
135 simdata->computation_amount,
140 simcall_set_category(simdata->compute, task->category);
142 p_simdata->waiting_action = simdata->compute;
143 comp_state = simcall_host_execution_wait(simdata->compute);
145 p_simdata->waiting_action = NULL;
149 XBT_DEBUG("Execution task '%s' finished in state %d",
150 task->name, (int)comp_state);
153 switch (e.category) {
155 status = MSG_HOST_FAILURE;
158 status = MSG_TASK_CANCELED;
165 /* action ended, set comm and compute = NULL, the actions is already destroyed
166 * in the main function */
167 simdata->computation_amount = 0.0;
168 simdata->comm = NULL;
169 simdata->compute = NULL;
171 TRACE_msg_task_execute_end(task);
178 /** \ingroup msg_task_usage
179 * \brief Sleep for the specified number of seconds
181 * Makes the current process sleep until \a time seconds have elapsed.
183 * \param nb_sec a number of second
185 MSG_error_t MSG_process_sleep(double nb_sec)
188 MSG_error_t status = MSG_OK;
189 /*m_process_t proc = MSG_process_self();*/
192 TRACE_msg_process_sleep_in(MSG_process_self());
195 /* create action to sleep */
197 /*proc->simdata->waiting_action = act_sleep;
199 FIXME: check if not setting the waiting_action breaks something on msg
201 proc->simdata->waiting_action = NULL;*/
204 simcall_process_sleep(nb_sec);
207 switch (e.category) {
210 TRACE_msg_process_sleep_out(MSG_process_self());
212 status = MSG_HOST_FAILURE;
221 TRACE_msg_process_sleep_out(MSG_process_self());
226 /** \ingroup msg_task_usage
227 * \brief Deprecated function that used to receive a task from a mailbox from a specific host.
229 * Sorry, this function is not supported anymore. That wouldn't be
230 * impossible to reimplement it, but we are lacking the time to do so ourselves.
231 * If you need this functionality, you can either:
233 * - implement the buffering mechanism on the user-level by queuing all messages
234 * received in the mailbox that do not match your expectation
235 * - change your application logic to leverage the mailboxes features. For example,
236 * if you have A receiving messages from B and C, you could have A waiting on
237 * mailbox "A" most of the time, but on "A#B" when it's waiting for specific
238 * messages from B and "A#C" when waiting for messages from C. You could even get A
239 * sometime waiting on all these mailboxes using @ref MSG_comm_waitany. You can find
240 * an example of use of this function in the @ref MSG_examples section.
241 * - Provide a proper patch to implement this functionality back in MSG. That wouldn't be
242 * very difficult actually. Check the function @ref MSG_mailbox_get_task_ext. During its call to
243 * simcall_comm_recv(), the 5th argument, match_fun, is NULL. Create a function that filters
244 * messages according to the host (that you will pass as sixth argument to simcall_comm_recv()
245 * and that your filtering function will receive as first parameter, and then, the filter could
246 * simply compare the host names, for example. After sufficient testing, provide an example that
247 * we could add to the distribution, and your first contribution to SimGrid is ready. Thanks in advance.
249 * \param task a memory location for storing a #m_task_t.
250 * \param alias name of the mailbox to receive the task from
251 * \param host a #m_host_t host from where the task was sent
254 * #MSG_OK if the task was successfully received,
255 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
258 MSG_task_receive_from_host(m_task_t * task, const char *alias,
261 return MSG_task_receive_ext(task, alias, -1, host);
264 /** \ingroup msg_task_usage
265 * \brief Receives a task from a mailbox.
267 * This is a blocking function, the execution flow will be blocked
268 * until the task is received. See #MSG_task_irecv
269 * for receiving tasks asynchronously.
271 * \param task a memory location for storing a #m_task_t.
272 * \param alias name of the mailbox to receive the task from
275 * #MSG_OK if the task was successfully received,
276 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
278 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
280 return MSG_task_receive_with_timeout(task, alias, -1);
283 /** \ingroup msg_task_usage
284 * \brief Receives a task from a mailbox with a given timeout.
286 * This is a blocking function with a timeout, the execution flow will be blocked
287 * until the task is received or the timeout is achieved. See #MSG_task_irecv
288 * for receiving tasks asynchronously. You can provide a -1 timeout
289 * to obtain an infinite timeout.
291 * \param task a memory location for storing a #m_task_t.
292 * \param alias name of the mailbox to receive the task from
293 * \param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_receive)
296 * #MSG_OK if the task was successfully received,
297 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
300 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
303 return MSG_task_receive_ext(task, alias, timeout, NULL);
306 /** \ingroup msg_task_usage
307 * \brief Receives a task from a mailbox from a specific host with a given timeout.
309 * This is a blocking function with a timeout, the execution flow will be blocked
310 * until the task is received or the timeout is achieved. See #MSG_task_irecv
311 * for receiving tasks asynchronously. You can provide a -1 timeout
312 * to obtain an infinite timeout.
314 * \param task a memory location for storing a #m_task_t.
315 * \param alias name of the mailbox to receive the task from
316 * \param timeout is the maximum wait time for completion (provide -1 for no timeout)
317 * \param host a #m_host_t host from where the task was sent
320 * #MSG_OK if the task was successfully received,
321 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
324 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
328 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
330 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
334 /** \ingroup msg_task_usage
335 * \brief Sends a task on a mailbox.
337 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
338 * to end the communication.
340 * \param task a #m_task_t to send on another location.
341 * \param alias name of the mailbox to sent the task to
342 * \return the msg_comm_t communication created
344 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
346 return MSG_task_isend_with_matching(task,alias,NULL,NULL);
349 /** \ingroup msg_task_usage
350 * \brief Sends a task on a mailbox, with support for matching requests
352 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
353 * to end the communication.
355 * \param task a #m_task_t to send on another location.
356 * \param alias name of the mailbox to sent the task to
357 * \param match_fun boolean function which parameters are:
358 * - match_data_provided_here
359 * - match_data_provided_by_other_side_if_any
360 * - the_smx_action_describing_the_other_side
361 * \param match_data user provided data passed to match_fun
362 * \return the msg_comm_t communication created
364 XBT_INLINE msg_comm_t MSG_task_isend_with_matching(m_task_t task, const char *alias,
365 int (*match_fun)(void*,void*, smx_action_t),
368 simdata_task_t t_simdata = NULL;
369 m_process_t process = MSG_process_self();
370 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
372 /* FIXME: these functions are not traceable */
374 /* Prepare the task to send */
375 t_simdata = task->simdata;
376 t_simdata->sender = process;
377 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
379 xbt_assert(t_simdata->isused == 0,
380 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
382 t_simdata->isused = 1;
383 t_simdata->comm = NULL;
384 msg_global->sent_msg++;
386 /* Send it by calling SIMIX network layer */
387 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
388 comm->task_sent = task;
389 comm->task_received = NULL;
390 comm->status = MSG_OK;
392 simcall_comm_isend(mailbox, t_simdata->message_size,
393 t_simdata->rate, task, sizeof(void *), match_fun, NULL, match_data, 0);
394 t_simdata->comm = comm->s_comm; /* FIXME: is the field t_simdata->comm still useful? */
399 /** \ingroup msg_task_usage
400 * \brief Sends a task on a mailbox.
402 * This is a non blocking detached send function.
403 * Think of it as a best effort send. Keep in mind that the third parameter
404 * is only called if the communication fails. If the communication does work,
405 * it is responsibility of the receiver code to free anything related to
406 * the task, as usual. More details on this can be obtained on
407 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
408 * in the SimGrid-user mailing list archive.
410 * \param task a #m_task_t to send on another location.
411 * \param alias name of the mailbox to sent the task to
412 * \param cleanup a function to destroy the task if the
413 * communication fails, e.g. MSG_task_destroy
414 * (if NULL, no function will be called)
416 void MSG_task_dsend(m_task_t task, const char *alias, void_f_pvoid_t cleanup)
418 simdata_task_t t_simdata = NULL;
419 m_process_t process = MSG_process_self();
420 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
422 /* FIXME: these functions are not traceable */
424 /* Prepare the task to send */
425 t_simdata = task->simdata;
426 t_simdata->sender = process;
427 t_simdata->source = ((simdata_process_t) SIMIX_process_self_get_data(process))->m_host;
429 xbt_assert(t_simdata->isused == 0,
430 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
432 t_simdata->isused = 1;
433 t_simdata->comm = NULL;
434 msg_global->sent_msg++;
436 /* Send it by calling SIMIX network layer */
437 smx_action_t comm = simcall_comm_isend(mailbox, t_simdata->message_size,
438 t_simdata->rate, task, sizeof(void *), NULL, cleanup, NULL, 1);
439 t_simdata->comm = comm;
442 /** \ingroup msg_task_usage
443 * \brief Starts listening for receiving a task from an asynchronous communication.
445 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test()
446 * to end the communication.
448 * \param task a memory location for storing a #m_task_t. has to be valid until the end of the communication.
449 * \param name of the mailbox to receive the task on
450 * \return the msg_comm_t communication created
452 msg_comm_t MSG_task_irecv(m_task_t *task, const char *name)
454 smx_rdv_t rdv = MSG_mailbox_get_by_alias(name);
456 /* FIXME: these functions are not traceable */
459 xbt_assert(task, "Null pointer for the task storage");
463 ("MSG_task_irecv() was asked to write in a non empty task struct.");
465 /* Try to receive it by calling SIMIX network layer */
466 msg_comm_t comm = xbt_new0(s_msg_comm_t, 1);
467 comm->task_sent = NULL;
468 comm->task_received = task;
469 comm->status = MSG_OK;
470 comm->s_comm = simcall_comm_irecv(rdv, task, NULL, NULL, NULL);
475 /** \ingroup msg_task_usage
476 * \brief Checks whether a communication is done, and if yes, finalizes it.
477 * \param comm the communication to test
478 * \return TRUE if the communication is finished
479 * (but it may have failed, use MSG_comm_get_status() to know its status)
480 * or FALSE if the communication is not finished yet
481 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
483 int MSG_comm_test(msg_comm_t comm)
488 finished = simcall_comm_test(comm->s_comm);
490 if (finished && comm->task_received != NULL) {
491 /* I am the receiver */
492 (*comm->task_received)->simdata->isused = 0;
496 switch (e.category) {
499 comm->status = MSG_HOST_FAILURE;
504 comm->status = MSG_TRANSFER_FAILURE;
509 comm->status = MSG_TIMEOUT;
522 /** \ingroup msg_task_usage
523 * \brief This function checks if a communication is finished.
524 * \param comms a vector of communications
525 * \return the position of the finished communication if any
526 * (but it may have failed, use MSG_comm_get_status() to know its status),
527 * or -1 if none is finished
529 int MSG_comm_testany(xbt_dynar_t comms)
532 int finished_index = -1;
534 /* create the equivalent dynar with SIMIX objects */
535 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
538 xbt_dynar_foreach(comms, cursor, comm) {
539 xbt_dynar_push(s_comms, &comm->s_comm);
542 MSG_error_t status = MSG_OK;
544 finished_index = simcall_comm_testany(s_comms);
547 switch (e.category) {
550 finished_index = e.value;
551 status = MSG_HOST_FAILURE;
555 finished_index = e.value;
556 status = MSG_TRANSFER_FAILURE;
560 finished_index = e.value;
561 status = MSG_TIMEOUT;
569 xbt_dynar_free(&s_comms);
571 if (finished_index != -1) {
572 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
573 /* the communication is finished */
574 comm->status = status;
576 if (status == MSG_OK && comm->task_received != NULL) {
577 /* I am the receiver */
578 (*comm->task_received)->simdata->isused = 0;
582 return finished_index;
585 /** \ingroup msg_task_usage
586 * \brief Destroys a communication.
587 * \param comm the communication to destroy.
589 void MSG_comm_destroy(msg_comm_t comm)
594 /** \ingroup msg_task_usage
595 * \brief Wait for the completion of a communication.
597 * It takes two parameters.
598 * \param comm the communication to wait.
599 * \param timeout Wait until the communication terminates or the timeout
600 * occurs. You can provide a -1 timeout to obtain an infinite timeout.
601 * \return MSG_error_t
603 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
607 simcall_comm_wait(comm->s_comm, timeout);
609 if (comm->task_received != NULL) {
610 /* I am the receiver */
611 (*comm->task_received)->simdata->isused = 0;
614 /* FIXME: these functions are not traceable */
617 switch (e.category) {
619 comm->status = MSG_HOST_FAILURE;
622 comm->status = MSG_TRANSFER_FAILURE;
625 comm->status = MSG_TIMEOUT;
636 /** \ingroup msg_task_usage
637 * \brief This function is called by a sender and permit to wait for each communication
639 * \param comm a vector of communication
640 * \param nb_elem is the size of the comm vector
641 * \param timeout for each call of MSG_comm_wait
643 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
646 for (i = 0; i < nb_elem; i++) {
647 MSG_comm_wait(comm[i], timeout);
651 /** \ingroup msg_task_usage
652 * \brief This function waits for the first communication finished in a list.
653 * \param comms a vector of communications
654 * \return the position of the first finished communication
655 * (but it may have failed, use MSG_comm_get_status() to know its status)
657 int MSG_comm_waitany(xbt_dynar_t comms)
660 int finished_index = -1;
662 /* create the equivalent dynar with SIMIX objects */
663 xbt_dynar_t s_comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
666 xbt_dynar_foreach(comms, cursor, comm) {
667 xbt_dynar_push(s_comms, &comm->s_comm);
670 MSG_error_t status = MSG_OK;
672 finished_index = simcall_comm_waitany(s_comms);
675 switch (e.category) {
678 finished_index = e.value;
679 status = MSG_HOST_FAILURE;
683 finished_index = e.value;
684 status = MSG_TRANSFER_FAILURE;
688 finished_index = e.value;
689 status = MSG_TIMEOUT;
698 xbt_assert(finished_index != -1, "WaitAny returned -1");
699 xbt_dynar_free(&s_comms);
701 comm = xbt_dynar_get_as(comms, finished_index, msg_comm_t);
702 /* the communication is finished */
703 comm->status = status;
705 if (comm->task_received != NULL) {
706 /* I am the receiver */
707 (*comm->task_received)->simdata->isused = 0;
710 return finished_index;
714 * \ingroup msg_task_usage
715 * \brief Returns the error (if any) that occured during a finished communication.
716 * \param comm a finished communication
717 * \return the status of the communication, or #MSG_OK if no error occured
718 * during the communication
720 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
725 /** \ingroup msg_task_usage
726 * \brief Get a task (#m_task_t) from a communication
728 * \param comm the communication where to get the task
729 * \return the task from the communication
731 m_task_t MSG_comm_get_task(msg_comm_t comm)
733 xbt_assert(comm, "Invalid parameter");
735 return comm->task_received ? *comm->task_received : comm->task_sent;
739 * \brief This function is called by SIMIX to copy the data of a comm.
740 * \param comm the comm
741 * \param buff the data copied
742 * \param buff_size size of the buffer
744 void MSG_comm_copy_data_from_SIMIX(smx_action_t comm, void* buff, size_t buff_size) {
747 SIMIX_comm_copy_pointer_callback(comm, buff, buff_size);
749 // notify the user callback if any
750 if (msg_global->task_copy_callback) {
751 m_task_t task = buff;
752 msg_global->task_copy_callback(task,
753 simcall_comm_get_src_proc(comm), simcall_comm_get_dst_proc(comm));
757 /** \ingroup msg_task_usage
758 * \brief Sends a task to a mailbox
760 * This is a blocking function, the execution flow will be blocked
761 * until the task is sent (and received in the other side if #MSG_task_receive is used).
762 * See #MSG_task_isend for sending tasks asynchronously.
764 * \param task the task to be sent
765 * \param alias the mailbox name to where the task is sent
767 * \return Returns #MSG_OK if the task was successfully sent,
768 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
770 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
772 XBT_DEBUG("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
773 return MSG_task_send_with_timeout(task, alias, -1);
776 /** \ingroup msg_task_usage
777 * \brief Sends a task to a mailbox with a maximum rate
779 * This is a blocking function, the execution flow will be blocked
780 * until the task is sent. The maxrate parameter allows the application
781 * to limit the bandwidth utilization of network links when sending the task.
783 * \param task the task to be sent
784 * \param alias the mailbox name to where the task is sent
785 * \param maxrate the maximum communication rate for sending this task
787 * \return Returns #MSG_OK if the task was successfully sent,
788 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
791 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
793 task->simdata->rate = maxrate;
794 return MSG_task_send(task, alias);
797 /** \ingroup msg_task_usage
798 * \brief Sends a task to a mailbox with a timeout
800 * This is a blocking function, the execution flow will be blocked
801 * until the task is sent or the timeout is achieved.
803 * \param task the task to be sent
804 * \param alias the mailbox name to where the task is sent
805 * \param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_send)
807 * \return Returns #MSG_OK if the task was successfully sent,
808 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
811 MSG_task_send_with_timeout(m_task_t task, const char *alias,
814 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
818 /** \ingroup msg_task_usage
819 * \brief Check if there is a communication going on in a mailbox.
821 * \param alias the name of the mailbox to be considered
823 * \return Returns 1 if there is a communication, 0 otherwise
825 int MSG_task_listen(const char *alias)
827 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
830 /** \ingroup msg_task_usage
831 * \brief Check the number of communication actions of a given host pending in a mailbox.
833 * \param alias the name of the mailbox to be considered
834 * \param host the host to check for communication
836 * \return Returns the number of pending communication actions of the host in the
837 * given mailbox, 0 if there is no pending communication actions.
840 int MSG_task_listen_from_host(const char *alias, m_host_t host)
843 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
847 /** \ingroup msg_task_usage
848 * \brief Look if there is a communication on a mailbox and return the
849 * PID of the sender process.
851 * \param alias the name of the mailbox to be considered
853 * \return Returns the PID of sender process,
854 * -1 if there is no communication in the mailbox.
856 int MSG_task_listen_from(const char *alias)
861 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
864 return MSG_process_get_PID(task->simdata->sender);
867 /** \ingroup msg_task_usage
868 * \brief Sets the tracing category of a task.
870 * This function should be called after the creation of
871 * a MSG task, to define the category of that task. The
872 * first parameter task must contain a task that was
873 * created with the function #MSG_task_create. The second
874 * parameter category must contain a category that was
875 * previously declared with the function #TRACE_category
876 * (or with #TRACE_category_with_color).
878 * See \ref tracing_tracing for details on how to trace
879 * the (categorized) resource utilization.
881 * \param task the task that is going to be categorized
882 * \param category the name of the category to be associated to the task
884 * \see MSG_task_get_category, TRACE_category, TRACE_category_with_color
886 void MSG_task_set_category (m_task_t task, const char *category)
889 TRACE_msg_set_task_category (task, category);
893 /** \ingroup msg_task_usage
895 * \brief Gets the current tracing category of a task.
897 * \param task the task to be considered
899 * \see MSG_task_set_category
901 * \return Returns the name of the tracing category of the given task, NULL otherwise
903 const char *MSG_task_get_category (m_task_t task)
906 return task->category;
912 #ifdef MSG_USE_DEPRECATED
913 /** \ingroup msg_deprecated_functions
915 * \brief Return the last value returned by a MSG function (except
918 MSG_error_t MSG_get_errno(void)
920 return PROCESS_GET_ERRNO();
923 /** \ingroup msg_deprecated_functions
924 * \brief Put a task on a channel of an host and waits for the end of the
927 * This function is used for describing the behavior of a process. It
928 * takes three parameter.
929 * \param task a #m_task_t to send on another location. This task
930 will not be usable anymore when the function will return. There is
931 no automatic task duplication and you have to save your parameters
932 before calling this function. Tasks are unique and once it has been
933 sent to another location, you should not access it anymore. You do
934 not need to call MSG_task_destroy() but to avoid using, as an
935 effect of inattention, this task anymore, you definitely should
936 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
937 can be transfered iff it has been correctly created with
939 * \param dest the destination of the message
940 * \param channel the channel on which the process should put this
941 task. This value has to be >=0 and < than the maximal number of
942 channels fixed with MSG_set_channel_number().
943 * \return #MSG_HOST_FAILURE if the host on which
944 * this function was called was shut down,
945 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
946 * (network failure, dest failure) or #MSG_OK if it succeeded.
948 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
950 XBT_WARN("DEPRECATED! Now use MSG_task_send");
951 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
954 /** \ingroup msg_deprecated_functions
955 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
961 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
964 XBT_WARN("DEPRECATED! Now use MSG_task_send_bounded");
965 task->simdata->rate = maxrate;
966 return MSG_task_put(task, dest, channel);
969 /** \ingroup msg_deprecated_functions
971 * \brief Put a task on a channel of an
972 * host (with a timeout on the waiting of the destination host) and
973 * waits for the end of the transmission.
975 * This function is used for describing the behavior of a process. It
976 * takes four parameter.
977 * \param task a #m_task_t to send on another location. This task
978 will not be usable anymore when the function will return. There is
979 no automatic task duplication and you have to save your parameters
980 before calling this function. Tasks are unique and once it has been
981 sent to another location, you should not access it anymore. You do
982 not need to call MSG_task_destroy() but to avoid using, as an
983 effect of inattention, this task anymore, you definitely should
984 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
985 can be transfered iff it has been correctly created with
987 * \param dest the destination of the message
988 * \param channel the channel on which the process should put this
989 task. This value has to be >=0 and < than the maximal number of
990 channels fixed with MSG_set_channel_number().
991 * \param timeout the maximum time to wait for a task before giving
992 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
994 * \return #MSG_HOST_FAILURE if the host on which
995 this function was called was shut down,
996 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
997 (network failure, dest failure, timeout...) or #MSG_OK if the communication succeeded.
1000 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
1001 m_channel_t channel, double timeout)
1003 XBT_WARN("DEPRECATED! Now use MSG_task_send_with_timeout");
1004 xbt_assert((channel >= 0)
1005 && (channel < msg_global->max_channel), "Invalid channel %d",
1008 XBT_DEBUG("MSG_task_put_with_timout: Trying to send a task to '%s'", SIMIX_host_get_name(dest->smx_host));
1010 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
1011 (dest, channel), task, timeout);
1014 /** \ingroup msg_deprecated_functions
1015 * \brief Test whether there is a pending communication on a channel, and who sent it.
1017 * It takes one parameter.
1018 * \param channel the channel on which the process should be
1019 listening. This value has to be >=0 and < than the maximal
1020 number of channels fixed with MSG_set_channel_number().
1021 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
1023 int MSG_task_probe_from(m_channel_t channel)
1025 XBT_WARN("DEPRECATED! Now use MSG_task_listen_from");
1028 xbt_assert((channel >= 0)
1029 && (channel < msg_global->max_channel), "Invalid channel %d",
1034 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
1035 (MSG_host_self(), channel))))
1038 return MSG_process_get_PID(task->simdata->sender);
1041 /** \ingroup msg_deprecated_functions
1042 * \brief Test whether there is a pending communication on a channel.
1044 * It takes one parameter.
1045 * \param channel the channel on which the process should be
1046 listening. This value has to be >=0 and < than the maximal
1047 number of channels fixed with MSG_set_channel_number().
1048 * \return 1 if there is a pending communication and 0 otherwise
1050 int MSG_task_Iprobe(m_channel_t channel)
1052 XBT_WARN("DEPRECATED!");
1053 xbt_assert((channel >= 0)
1054 && (channel < msg_global->max_channel), "Invalid channel %d",
1058 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
1059 (MSG_host_self(), channel));
1062 /** \ingroup msg_deprecated_functions
1064 * \brief Return the number of tasks waiting to be received on a \a
1065 channel and sent by \a host.
1067 * It takes two parameters.
1068 * \param channel the channel on which the process should be
1069 listening. This value has to be >=0 and < than the maximal
1070 number of channels fixed with MSG_set_channel_number().
1071 * \param host the host that is to be watched.
1072 * \return the number of tasks waiting to be received on \a channel
1073 and sent by \a host.
1075 int MSG_task_probe_from_host(int channel, m_host_t host)
1077 XBT_WARN("DEPRECATED! Now use MSG_task_listen_from_host");
1078 xbt_assert((channel >= 0)
1079 && (channel < msg_global->max_channel), "Invalid channel %d",
1083 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
1084 (MSG_host_self(), channel),
1089 /** \ingroup msg_deprecated_functions
1090 * \brief Listen on \a channel and waits for receiving a task from \a host.
1092 * It takes three parameters.
1093 * \param task a memory location for storing a #m_task_t. It will
1094 hold a task when this function will return. Thus \a task should not
1095 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
1096 those two condition does not hold, there will be a warning message.
1097 * \param channel the channel on which the process should be
1098 listening. This value has to be >=0 and < than the maximal
1099 number of channels fixed with MSG_set_channel_number().
1100 * \param host the host that is to be watched.
1101 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
1104 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
1106 XBT_WARN("DEPRECATED! Now use MSG_task_receive_from_host");
1107 return MSG_task_get_ext(task, channel, -1, host);
1110 /** \ingroup msg_deprecated_functions
1111 * \brief Listen on a channel and wait for receiving a task.
1113 * It takes two parameters.
1114 * \param task a memory location for storing a #m_task_t. It will
1115 hold a task when this function will return. Thus \a task should not
1116 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
1117 those two condition does not hold, there will be a warning message.
1118 * \param channel the channel on which the process should be
1119 listening. This value has to be >=0 and < than the maximal
1120 number of channels fixed with MSG_set_channel_number().
1121 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
1123 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
1125 XBT_WARN("DEPRECATED! Now use MSG_task_receive");
1126 return MSG_task_get_with_timeout(task, channel, -1);
1129 /** \ingroup msg_deprecated_functions
1130 * \brief Listen on a channel and wait for receiving a task with a timeout.
1132 * It takes three parameters.
1133 * \param task a memory location for storing a #m_task_t. It will
1134 hold a task when this function will return. Thus \a task should not
1135 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
1136 those two condition does not hold, there will be a warning message.
1137 * \param channel the channel on which the process should be
1138 listening. This value has to be >=0 and < than the maximal
1139 number of channels fixed with MSG_set_channel_number().
1140 * \param max_duration the maximum time to wait for a task before giving
1141 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
1142 will not be modified and will still be
1143 equal to \c NULL when returning.
1144 * \return a #MSG_error_t indicating whether the operation was successful (#MSG_OK), or why it failed otherwise.
1147 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
1148 double max_duration)
1150 XBT_WARN("DEPRECATED! Now use MSG_task_receive_with_timeout");
1151 return MSG_task_get_ext(task, channel, max_duration, NULL);
1155 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
1158 XBT_WARN("DEPRECATED! Now use MSG_task_receive_ext");
1159 xbt_assert((channel >= 0)
1160 && (channel < msg_global->max_channel), "Invalid channel %d",
1164 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
1165 (MSG_host_self(), channel), task, host,