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();
41 e_smx_state_t comp_state;
44 simdata = task->simdata;
46 xbt_assert0(simdata->host_nb == 0,
47 "This is a parallel task. Go to hell.");
50 TRACE_msg_task_execute_start(task);
53 xbt_assert1((!simdata->compute) && (task->simdata->isused == 0),
54 "This task is executed somewhere else. Go fix your code! %d",
55 task->simdata->isused);
57 DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
59 if (simdata->computation_amount == 0) {
61 TRACE_msg_task_execute_end(task);
67 SIMIX_req_host_execute(task->name, SIMIX_host_self(),
68 simdata->computation_amount,
71 SIMIX_req_set_category(simdata->compute, task->category);
74 self->simdata->waiting_action = simdata->compute;
75 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
76 self->simdata->waiting_action = NULL;
80 DEBUG2("Execution task '%s' finished in state %d", task->name, comp_state);
81 if (comp_state == SIMIX_DONE) {
82 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
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 */
93 simdata->compute = NULL;
95 TRACE_msg_task_execute_end(task);
97 MSG_RETURN(MSG_HOST_FAILURE);
99 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
100 simdata->comm = NULL;
101 simdata->compute = NULL;
103 TRACE_msg_task_execute_end(task);
105 MSG_RETURN(MSG_TASK_CANCELLED);
109 /** \ingroup m_task_management
110 * \brief Creates a new #m_task_t (a parallel one....).
112 * A constructor for #m_task_t taking six arguments and returning the
113 corresponding object.
114 * \param name a name for the object. It is for user-level information
116 * \param host_nb the number of hosts implied in the parallel task.
117 * \param host_list an array of \p host_nb m_host_t.
118 * \param computation_amount an array of \p host_nb
119 doubles. computation_amount[i] is the total number of operations
120 that have to be performed on host_list[i].
121 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
122 * \param data a pointer to any data may want to attach to the new
123 object. It is for user-level information and can be NULL. It can
124 be retrieved with the function \ref MSG_task_get_data.
126 * \return The new corresponding object.
129 MSG_parallel_task_create(const char *name, int host_nb,
130 const m_host_t * host_list,
131 double *computation_amount,
132 double *communication_amount, void *data)
135 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
136 m_task_t task = xbt_new0(s_m_task_t, 1);
137 task->simdata = simdata;
140 task->name = xbt_strdup(name);
144 simdata->computation_amount = 0;
145 simdata->message_size = 0;
146 simdata->compute = NULL;
147 simdata->comm = NULL;
148 simdata->rate = -1.0;
150 simdata->sender = NULL;
151 simdata->receiver = NULL;
152 simdata->source = NULL;
154 simdata->host_nb = host_nb;
155 simdata->host_list = xbt_new0(smx_host_t, host_nb);
156 simdata->comp_amount = computation_amount;
157 simdata->comm_amount = communication_amount;
159 for (i = 0; i < host_nb; i++)
160 simdata->host_list[i] = host_list[i]->simdata->smx_host;
165 MSG_error_t MSG_parallel_task_execute(m_task_t task)
167 simdata_task_t simdata = NULL;
168 e_smx_state_t comp_state;
169 m_process_t self = MSG_process_self();
172 simdata = task->simdata;
174 xbt_assert0((!simdata->compute)
175 && (task->simdata->isused == 0),
176 "This task is executed somewhere else. Go fix your code!");
178 xbt_assert0(simdata->host_nb,
179 "This is not a parallel task. Go to hell.");
181 DEBUG1("Parallel computing on %s", MSG_process_self()->simdata->m_host->name);
186 SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
188 simdata->comp_amount,
189 simdata->comm_amount, 1.0, -1.0);
190 DEBUG1("Parallel execution action created: %p", simdata->compute);
192 self->simdata->waiting_action = simdata->compute;
193 comp_state = SIMIX_req_host_execution_wait(simdata->compute);
194 self->simdata->waiting_action = NULL;
196 DEBUG2("Finished waiting for execution of action %p, state = %d", simdata->compute, comp_state);
200 if (comp_state == SIMIX_DONE) {
201 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
202 simdata->computation_amount = 0.0;
203 simdata->comm = NULL;
204 simdata->compute = NULL;
206 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
207 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
208 simdata->comm = NULL;
209 simdata->compute = NULL;
210 MSG_RETURN(MSG_HOST_FAILURE);
212 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
213 simdata->comm = NULL;
214 simdata->compute = NULL;
215 MSG_RETURN(MSG_TASK_CANCELLED);
220 /** \ingroup msg_gos_functions
221 * \brief Sleep for the specified number of seconds
223 * Makes the current process sleep until \a time seconds have elapsed.
225 * \param nb_sec a number of second
227 MSG_error_t MSG_process_sleep(double nb_sec)
230 /*m_process_t proc = MSG_process_self();*/
233 TRACE_msg_process_sleep_in(MSG_process_self());
236 /* create action to sleep */
237 state = SIMIX_req_process_sleep(nb_sec);
239 /*proc->simdata->waiting_action = act_sleep;
241 FIXME: check if not setting the waiting_action breaks something on msg
243 proc->simdata->waiting_action = NULL;*/
245 if (state == SIMIX_DONE) {
246 if (SIMIX_req_host_get_state(SIMIX_host_self()) == SURF_RESOURCE_OFF) {
248 TRACE_msg_process_sleep_out(MSG_process_self());
250 MSG_RETURN(MSG_HOST_FAILURE);
254 TRACE_msg_process_sleep_out(MSG_process_self());
256 MSG_RETURN(MSG_HOST_FAILURE);
259 TRACE_msg_process_sleep_out(MSG_process_self());
264 /** \ingroup msg_gos_functions
265 * \brief Listen on \a channel and waits for receiving a task from \a host.
267 * It takes three parameters.
268 * \param task a memory location for storing a #m_task_t. It will
269 hold a task when this function will return. Thus \a task should not
270 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
271 those two condition does not hold, there will be a warning message.
272 * \param channel the channel on which the agent should be
273 listening. This value has to be >=0 and < than the maximal
274 number of channels fixed with MSG_set_channel_number().
275 * \param host the host that is to be watched.
276 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
277 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
280 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
282 return MSG_task_get_ext(task, channel, -1, host);
285 /** \ingroup msg_gos_functions
286 * \brief Listen on a channel and wait for receiving a task.
288 * It takes two parameters.
289 * \param task a memory location for storing a #m_task_t. It will
290 hold a task when this function will return. Thus \a task should not
291 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
292 those two condition does not hold, there will be a warning message.
293 * \param channel the channel on which the agent should be
294 listening. This value has to be >=0 and < than the maximal
295 number of channels fixed with MSG_set_channel_number().
296 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
297 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
299 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
301 return MSG_task_get_with_timeout(task, channel, -1);
304 /** \ingroup msg_gos_functions
305 * \brief Listen on a channel and wait for receiving a task with a timeout.
307 * It takes three parameters.
308 * \param task a memory location for storing a #m_task_t. It will
309 hold a task when this function will return. Thus \a task should not
310 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
311 those two condition does not hold, there will be a warning message.
312 * \param channel the channel on which the agent should be
313 listening. This value has to be >=0 and < than the maximal
314 number of channels fixed with MSG_set_channel_number().
315 * \param max_duration the maximum time to wait for a task before giving
316 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
317 will not be modified and will still be
318 equal to \c NULL when returning.
319 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
320 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
323 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
326 return MSG_task_get_ext(task, channel, max_duration, NULL);
329 /** \defgroup msg_gos_functions MSG Operating System Functions
330 * \brief This section describes the functions that can be used
331 * by an agent for handling some task.
335 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
338 xbt_assert1((channel >= 0)
339 && (channel < msg_global->max_channel), "Invalid channel %d",
343 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
344 (MSG_host_self(), channel), task, host,
349 MSG_task_receive_from_host(m_task_t * task, const char *alias,
352 return MSG_task_receive_ext(task, alias, -1, host);
355 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
357 return MSG_task_receive_with_timeout(task, alias, -1);
361 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
364 return MSG_task_receive_ext(task, alias, timeout, NULL);
368 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
372 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
374 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
378 /** \ingroup msg_gos_functions
379 * \brief Send a task on a channel.
381 * This function takes two parameter.
382 * \param task a #m_task_t to send on another location.
383 * \param alias the channel on which the agent should put this
384 task. This value has to be >=0 and < than the maximal number of
385 channels fixed with MSG_set_channel_number().
386 * \return the msg_comm_t communication.
388 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
390 simdata_task_t t_simdata = NULL;
391 m_process_t process = MSG_process_self();
392 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
396 /* FIXME: these functions are not tracable */
398 /* Prepare the task to send */
399 t_simdata = task->simdata;
400 t_simdata->sender = process;
401 t_simdata->source = MSG_host_self();
403 xbt_assert0(t_simdata->isused == 0,
404 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
407 msg_global->sent_msg++;
409 /* Send it by calling SIMIX network layer */
411 SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
412 t_simdata->rate, task, sizeof(void *), NULL, NULL);
413 return t_simdata->comm;
416 /** \ingroup msg_gos_functions
417 * \brief Listen on a channel for receiving a task from an asynchronous communication.
419 * It takes two parameters.
420 * \param task a memory location for storing a #m_task_t.
421 * \param alias the channel on which the agent should be
422 listening. This value has to be >=0 and < than the maximal
423 number of channels fixed with MSG_set_channel_number().
424 * \return the msg_comm_t communication.
426 msg_comm_t MSG_task_irecv(m_task_t * task, const char *alias)
428 smx_rdv_t rdv = MSG_mailbox_get_by_alias(alias);
432 /* FIXME: these functions are not tracable */
435 xbt_assert0(task, "Null pointer for the task storage");
439 ("MSG_task_get() was asked to write in a non empty task struct.");
441 /* Try to receive it by calling SIMIX network layer */
442 return SIMIX_req_comm_irecv(rdv, task, NULL, NULL, NULL);
445 /** \ingroup msg_gos_functions
446 * \brief Returns whether a communication is finished.
447 * \param comm the communication to test
448 * \return TRUE if the communication is finished
449 * (but it may have failed, use MSG_comm_get_status() to know its status)
450 * or FALSE if the communication is not finished yet
451 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
453 int MSG_comm_test(msg_comm_t comm)
458 finished = SIMIX_req_comm_test(comm);
461 switch (e.category) {
477 /** \ingroup msg_gos_functions
478 * \brief This function checks if a communication is finished
479 * \param comms a vector of communications
480 * \return the position of the finished communication if any
481 * (but it may have failed, use MSG_comm_get_status() to know its status),
482 * or -1 if none is finished
484 int MSG_comm_testany(xbt_dynar_t comms)
487 int finished_index = -1;
489 finished_index = SIMIX_req_comm_testany(comms);
492 switch (e.category) {
497 finished_index = e.value;
505 return finished_index;
508 /** \ingroup msg_gos_functions
509 * \brief After received TRUE to MSG_comm_test(), the communication should be destroyed.
511 * It takes one parameter.
512 * \param comm the communication to destroy.
514 void MSG_comm_destroy(msg_comm_t comm)
516 if (SIMIX_req_comm_get_src_proc(comm) != SIMIX_process_self()
517 && MSG_comm_get_status(comm) == MSG_OK) {
519 task = (m_task_t) SIMIX_req_comm_get_src_buff(comm);
520 task->simdata->isused=0;
522 SIMIX_req_comm_destroy(comm);
525 /** \ingroup msg_gos_functions
526 * \brief Wait for the completion of a communication.
528 * It takes two parameters.
529 * \param comm the communication to wait.
530 * \param timeout Wait until the communication terminates or the timeout occurs
531 * \return MSG_error_t
533 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
536 MSG_error_t res = MSG_OK;
538 SIMIX_req_comm_wait(comm, timeout);
540 if (SIMIX_req_comm_get_src_proc(comm) != SIMIX_process_self()) {
542 task = (m_task_t) SIMIX_req_comm_get_src_buff(comm);
543 task->simdata->isused=0;
546 /* FIXME: these functions are not tracable */
549 switch (e.category) {
551 res = MSG_HOST_FAILURE;
554 res = MSG_TRANSFER_FAILURE;
567 /** \ingroup msg_gos_functions
568 * \brief This function is called by a sender and permit to wait for each communication
570 * It takes three parameters.
571 * \param comm a vector of communication
572 * \param nb_elem is the size of the comm vector
573 * \param timeout for each call of MSG_comm_wait
575 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
578 for (i = 0; i < nb_elem; i++) {
579 MSG_comm_wait(comm[i], timeout);
583 /** \ingroup msg_gos_functions
584 * \brief This function wait for the first completed communication
586 * It takes on parameter.
587 * \param comms a vector of communication
588 * \return the position of the completed communication from the xbt_dynar_t.
590 int MSG_comm_waitany(xbt_dynar_t comms)
593 int finished_index = -1;
595 finished_index = SIMIX_req_comm_waitany(comms);
598 switch (e.category) {
603 finished_index = e.value;
609 return finished_index;
613 * \ingroup msg_gos_functions
614 * \brief Returns the error (if any) that occured during a finished communication.
615 * \param comm a finished communication
616 * \return the status of the communication, or MSG_OK if the communication
617 * was successfully completed
619 MSG_error_t MSG_comm_get_status(msg_comm_t comm) {
622 e_smx_state_t smx_state = SIMIX_req_comm_get_state(comm);
627 result = MSG_TASK_CANCELLED;
631 case SIMIX_SRC_HOST_FAILURE:
632 case SIMIX_DST_HOST_FAILURE:
633 result = MSG_HOST_FAILURE;
636 case SIMIX_LINK_FAILURE:
637 result = MSG_TRANSFER_FAILURE;
640 case SIMIX_SRC_TIMEOUT:
641 case SIMIX_DST_TIMEOUT:
642 result = MSG_TIMEOUT;
652 m_task_t MSG_comm_get_task(msg_comm_t comm)
654 xbt_assert0(comm, "Invalid parameters");
655 return (m_task_t) SIMIX_req_comm_get_src_buff(comm);
658 /** \ingroup msg_gos_functions
659 * \brief Put a task on a channel of an host and waits for the end of the
662 * This function is used for describing the behavior of an agent. It
663 * takes three parameter.
664 * \param task a #m_task_t to send on another location. This task
665 will not be usable anymore when the function will return. There is
666 no automatic task duplication and you have to save your parameters
667 before calling this function. Tasks are unique and once it has been
668 sent to another location, you should not access it anymore. You do
669 not need to call MSG_task_destroy() but to avoid using, as an
670 effect of inattention, this task anymore, you definitely should
671 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
672 can be transfered iff it has been correctly created with
674 * \param dest the destination of the message
675 * \param channel the channel on which the agent should put this
676 task. This value has to be >=0 and < than the maximal number of
677 channels fixed with MSG_set_channel_number().
678 * \return #MSG_FATAL if \a task is not properly initialized and
679 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
680 * this function was called was shut down. Returns
681 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
682 * (network failure, dest failure)
684 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
686 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
689 /** \ingroup msg_gos_functions
690 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
696 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
699 task->simdata->rate = maxrate;
700 return MSG_task_put(task, dest, channel);
703 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
704 * host (with a timeout on the waiting of the destination host) and
705 * waits for the end of the transmission.
707 * This function is used for describing the behavior of an agent. It
708 * takes four parameter.
709 * \param task a #m_task_t to send on another location. This task
710 will not be usable anymore when the function will return. There is
711 no automatic task duplication and you have to save your parameters
712 before calling this function. Tasks are unique and once it has been
713 sent to another location, you should not access it anymore. You do
714 not need to call MSG_task_destroy() but to avoid using, as an
715 effect of inattention, this task anymore, you definitely should
716 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
717 can be transfered iff it has been correctly created with
719 * \param dest the destination of the message
720 * \param channel the channel on which the agent should put this
721 task. This value has to be >=0 and < than the maximal number of
722 channels fixed with MSG_set_channel_number().
723 * \param timeout the maximum time to wait for a task before giving
724 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
726 * \return #MSG_FATAL if \a task is not properly initialized and
727 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
728 this function was called was shut down. Returns
729 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
730 (network failure, dest failure, timeout...)
733 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
734 m_channel_t channel, double timeout)
736 xbt_assert1((channel >= 0)
737 && (channel < msg_global->max_channel), "Invalid channel %d",
740 DEBUG1("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
742 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
743 (dest, channel), task, timeout);
746 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
748 DEBUG1("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
749 return MSG_task_send_with_timeout(task, alias, -1);
754 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
756 task->simdata->rate = maxrate;
757 return MSG_task_send(task, alias);
762 MSG_task_send_with_timeout(m_task_t task, const char *alias,
765 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
769 int MSG_task_listen(const char *alias)
773 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
776 /** \ingroup msg_gos_functions
777 * \brief Test whether there is a pending communication on a channel.
779 * It takes one parameter.
780 * \param channel the channel on which the agent should be
781 listening. This value has to be >=0 and < than the maximal
782 number of channels fixed with MSG_set_channel_number().
783 * \return 1 if there is a pending communication and 0 otherwise
785 int MSG_task_Iprobe(m_channel_t channel)
787 xbt_assert1((channel >= 0)
788 && (channel < msg_global->max_channel), "Invalid channel %d",
794 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
795 (MSG_host_self(), channel));
798 /** \ingroup msg_gos_functions
800 * \brief Return the number of tasks waiting to be received on a \a
801 channel and sent by \a host.
803 * It takes two parameters.
804 * \param channel the channel on which the agent should be
805 listening. This value has to be >=0 and < than the maximal
806 number of channels fixed with MSG_set_channel_number().
807 * \param host the host that is to be watched.
808 * \return the number of tasks waiting to be received on \a channel
811 int MSG_task_probe_from_host(int channel, m_host_t host)
813 xbt_assert1((channel >= 0)
814 && (channel < msg_global->max_channel), "Invalid channel %d",
820 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
821 (MSG_host_self(), channel),
826 int MSG_task_listen_from_host(const char *alias, m_host_t host)
831 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
835 /** \ingroup msg_gos_functions
836 * \brief Test whether there is a pending communication on a channel, and who sent it.
838 * It takes one parameter.
839 * \param channel the channel on which the agent should be
840 listening. This value has to be >=0 and < than the maximal
841 number of channels fixed with MSG_set_channel_number().
842 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
844 int MSG_task_probe_from(m_channel_t channel)
850 xbt_assert1((channel >= 0)
851 && (channel < msg_global->max_channel), "Invalid channel %d",
856 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
857 (MSG_host_self(), channel))))
860 return MSG_process_get_PID(task->simdata->sender);
863 int MSG_task_listen_from(const char *alias)
870 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
873 return MSG_process_get_PID(task->simdata->sender);