1 /* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "xbt/sysdep.h"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg,
15 "Logging specific to MSG (gos)");
17 /** \ingroup msg_gos_functions
19 * \brief Return the last value returned by a MSG function (except
22 MSG_error_t MSG_get_errno(void)
24 return PROCESS_GET_ERRNO();
27 /** \ingroup msg_gos_functions
28 * \brief Executes a task and waits for its termination.
30 * This function is used for describing the behavior of an agent. It
31 * takes only one parameter.
32 * \param task a #m_task_t to execute on the location on which the
34 * \return #MSG_FATAL if \a task is not properly initialized and
37 MSG_error_t MSG_task_execute(m_task_t task)
39 simdata_task_t simdata = NULL;
40 m_process_t self = MSG_process_self();
43 simdata = task->simdata;
45 xbt_assert0(simdata->host_nb == 0,
46 "This is a parallel task. Go to hell.");
49 TRACE_msg_task_execute_start(task);
52 xbt_assert1((!simdata->compute) && (task->simdata->refcount == 1),
53 "This task is executed somewhere else. Go fix your code! %d",
54 task->simdata->refcount);
56 DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name);
58 if (simdata->computation_amount == 0) {
60 TRACE_msg_task_execute_end(task);
66 SIMIX_req_host_execute(task->name, SIMIX_host_self(),
67 simdata->computation_amount);
68 SIMIX_req_host_execution_set_priority(simdata->compute, simdata->priority);
70 SIMIX_req_set_category(simdata->compute, task->category);
73 self->simdata->waiting_action = simdata->compute;
74 SIMIX_req_host_execution_wait(simdata->compute);
75 self->simdata->waiting_action = NULL;
79 DEBUG2("Execution task '%s' finished in state %d", task->name, SIMIX_req_host_execution_get_state(task->simdata->compute));
80 if (SIMIX_req_host_execution_get_state(task->simdata->compute) == SIMIX_DONE) {
81 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
82 SIMIX_req_host_execution_destroy(task->simdata->compute);
83 simdata->computation_amount = 0.0;
85 simdata->compute = NULL;
87 TRACE_msg_task_execute_end(task);
90 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
91 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
92 SIMIX_req_host_execution_destroy(task->simdata->compute);
94 simdata->compute = NULL;
96 TRACE_msg_task_execute_end(task);
98 MSG_RETURN(MSG_HOST_FAILURE);
100 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
101 SIMIX_req_host_execution_destroy(task->simdata->compute);
102 simdata->comm = NULL;
103 simdata->compute = NULL;
105 TRACE_msg_task_execute_end(task);
107 MSG_RETURN(MSG_TASK_CANCELLED);
111 /** \ingroup m_task_management
112 * \brief Creates a new #m_task_t (a parallel one....).
114 * A constructor for #m_task_t taking six arguments and returning the
115 corresponding object.
116 * \param name a name for the object. It is for user-level information
118 * \param host_nb the number of hosts implied in the parallel task.
119 * \param host_list an array of \p host_nb m_host_t.
120 * \param computation_amount an array of \p host_nb
121 doubles. computation_amount[i] is the total number of operations
122 that have to be performed on host_list[i].
123 * \param communication_amount an array of \p host_nb* \p host_nb doubles.
124 * \param data a pointer to any data may want to attach to the new
125 object. It is for user-level information and can be NULL. It can
126 be retrieved with the function \ref MSG_task_get_data.
128 * \return The new corresponding object.
131 MSG_parallel_task_create(const char *name, int host_nb,
132 const m_host_t * host_list,
133 double *computation_amount,
134 double *communication_amount, void *data)
137 simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1);
138 m_task_t task = xbt_new0(s_m_task_t, 1);
139 task->simdata = simdata;
142 task->name = xbt_strdup(name);
146 simdata->computation_amount = 0;
147 simdata->message_size = 0;
148 simdata->compute = NULL;
149 simdata->comm = NULL;
150 simdata->rate = -1.0;
151 simdata->refcount = 1;
152 simdata->sender = NULL;
153 simdata->receiver = NULL;
154 simdata->source = NULL;
156 simdata->host_nb = host_nb;
157 simdata->host_list = xbt_new0(smx_host_t, host_nb);
158 simdata->comp_amount = computation_amount;
159 simdata->comm_amount = communication_amount;
161 for (i = 0; i < host_nb; i++)
162 simdata->host_list[i] = host_list[i]->simdata->smx_host;
167 MSG_error_t MSG_parallel_task_execute(m_task_t task)
169 simdata_task_t simdata = NULL;
170 m_process_t self = MSG_process_self();
173 simdata = task->simdata;
175 xbt_assert0((!simdata->compute)
176 && (task->simdata->refcount == 1),
177 "This task is executed somewhere else. Go fix your code!");
179 xbt_assert0(simdata->host_nb,
180 "This is not a parallel task. Go to hell.");
182 DEBUG1("Parallel computing on %s", MSG_process_self()->simdata->m_host->name);
187 SIMIX_req_host_parallel_execute(task->name, simdata->host_nb,
189 simdata->comp_amount,
190 simdata->comm_amount, 1.0, -1.0);
191 DEBUG1("Parallel execution action created: %p", simdata->compute);
193 self->simdata->waiting_action = simdata->compute;
194 SIMIX_req_host_execution_wait(simdata->compute);
195 self->simdata->waiting_action = NULL;
197 DEBUG2("Finished waiting for execution of action %p, state = %d", simdata->compute, SIMIX_req_host_execution_get_state(task->simdata->compute));
201 if (SIMIX_req_host_execution_get_state(task->simdata->compute) == SIMIX_DONE) {
202 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
203 SIMIX_req_host_execution_destroy(task->simdata->compute);
204 simdata->computation_amount = 0.0;
205 simdata->comm = NULL;
206 simdata->compute = NULL;
208 } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) {
209 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
210 SIMIX_req_host_execution_destroy(task->simdata->compute);
211 simdata->comm = NULL;
212 simdata->compute = NULL;
213 MSG_RETURN(MSG_HOST_FAILURE);
215 /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
216 SIMIX_req_host_execution_destroy(task->simdata->compute);
217 simdata->comm = NULL;
218 simdata->compute = NULL;
219 MSG_RETURN(MSG_TASK_CANCELLED);
224 /** \ingroup msg_gos_functions
225 * \brief Sleep for the specified number of seconds
227 * Makes the current process sleep until \a time seconds have elapsed.
229 * \param nb_sec a number of second
231 MSG_error_t MSG_process_sleep(double nb_sec)
234 /*m_process_t proc = MSG_process_self();*/
237 TRACE_msg_process_sleep_in(MSG_process_self());
240 /* create action to sleep */
241 state = SIMIX_req_process_sleep(nb_sec);
243 /*proc->simdata->waiting_action = act_sleep;
245 FIXME: check if not setting the waiting_action breaks something on msg
247 proc->simdata->waiting_action = NULL;*/
249 if (state == SIMIX_DONE) {
250 if (SIMIX_req_host_get_state(SIMIX_host_self()) == SURF_RESOURCE_OFF) {
252 TRACE_msg_process_sleep_out(MSG_process_self());
254 MSG_RETURN(MSG_HOST_FAILURE);
258 TRACE_msg_process_sleep_out(MSG_process_self());
260 MSG_RETURN(MSG_HOST_FAILURE);
263 TRACE_msg_process_sleep_out(MSG_process_self());
268 /** \ingroup msg_gos_functions
269 * \brief Listen on \a channel and waits for receiving a task from \a host.
271 * It takes three parameters.
272 * \param task a memory location for storing a #m_task_t. It will
273 hold a task when this function will return. Thus \a task should not
274 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
275 those two condition does not hold, there will be a warning message.
276 * \param channel the channel on which the agent should be
277 listening. This value has to be >=0 and < than the maximal
278 number of channels fixed with MSG_set_channel_number().
279 * \param host the host that is to be watched.
280 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
281 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
284 MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host)
286 return MSG_task_get_ext(task, channel, -1, host);
289 /** \ingroup msg_gos_functions
290 * \brief Listen on a channel and wait for receiving a task.
292 * It takes two parameters.
293 * \param task a memory location for storing a #m_task_t. It will
294 hold a task when this function will return. Thus \a task should not
295 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
296 those two condition does not hold, there will be a warning message.
297 * \param channel the channel on which the agent should be
298 listening. This value has to be >=0 and < than the maximal
299 number of channels fixed with MSG_set_channel_number().
300 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
301 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
303 MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel)
305 return MSG_task_get_with_timeout(task, channel, -1);
308 /** \ingroup msg_gos_functions
309 * \brief Listen on a channel and wait for receiving a task with a timeout.
311 * It takes three parameters.
312 * \param task a memory location for storing a #m_task_t. It will
313 hold a task when this function will return. Thus \a task should not
314 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
315 those two condition does not hold, there will be a warning message.
316 * \param channel the channel on which the agent should be
317 listening. This value has to be >=0 and < than the maximal
318 number of channels fixed with MSG_set_channel_number().
319 * \param max_duration the maximum time to wait for a task before giving
320 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
321 will not be modified and will still be
322 equal to \c NULL when returning.
323 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
324 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
327 MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel,
330 return MSG_task_get_ext(task, channel, max_duration, NULL);
333 /** \defgroup msg_gos_functions MSG Operating System Functions
334 * \brief This section describes the functions that can be used
335 * by an agent for handling some task.
339 MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout,
342 xbt_assert1((channel >= 0)
343 && (channel < msg_global->max_channel), "Invalid channel %d",
347 MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel
348 (MSG_host_self(), channel), task, host,
353 MSG_task_receive_from_host(m_task_t * task, const char *alias,
356 return MSG_task_receive_ext(task, alias, -1, host);
359 MSG_error_t MSG_task_receive(m_task_t * task, const char *alias)
361 return MSG_task_receive_with_timeout(task, alias, -1);
365 MSG_task_receive_with_timeout(m_task_t * task, const char *alias,
368 return MSG_task_receive_ext(task, alias, timeout, NULL);
372 MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout,
376 ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'",
378 return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task,
382 /** \ingroup msg_gos_functions
383 * \brief Send a task on a channel.
385 * This function takes two parameter.
386 * \param task a #m_task_t to send on another location.
387 * \param alias the channel on which the agent should put this
388 task. This value has to be >=0 and < than the maximal number of
389 channels fixed with MSG_set_channel_number().
390 * \return the msg_comm_t communication.
392 msg_comm_t MSG_task_isend(m_task_t task, const char *alias)
394 simdata_task_t t_simdata = NULL;
395 m_process_t process = MSG_process_self();
396 msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias);
400 /* FIXME: these functions are not tracable */
402 /* Prepare the task to send */
403 t_simdata = task->simdata;
404 t_simdata->sender = process;
405 t_simdata->source = MSG_host_self();
407 xbt_assert0(t_simdata->refcount == 1,
408 "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
410 t_simdata->refcount++;
411 msg_global->sent_msg++;
412 process->simdata->waiting_task = task;
414 /* Send it by calling SIMIX network layer */
416 return SIMIX_req_comm_isend(mailbox, t_simdata->message_size,
417 t_simdata->rate, task, sizeof(void *),
421 /** \ingroup msg_gos_functions
422 * \brief Listen on a channel for receiving a task from an asynchronous communication.
424 * It takes two parameters.
425 * \param task a memory location for storing a #m_task_t.
426 * \param alias the channel on which the agent should be
427 listening. This value has to be >=0 and < than the maximal
428 number of channels fixed with MSG_set_channel_number().
429 * \return the msg_comm_t communication.
431 msg_comm_t MSG_task_irecv(m_task_t * task, const char *alias)
433 smx_rdv_t rdv = MSG_mailbox_get_by_alias(alias);
437 /* FIXME: these functions are not tracable */
440 xbt_assert0(task, "Null pointer for the task storage");
444 ("MSG_task_get() was asked to write in a non empty task struct.");
446 /* Try to receive it by calling SIMIX network layer */
447 return SIMIX_req_comm_irecv(rdv, task, NULL);
450 /** \ingroup msg_gos_functions
451 * \brief Test the status of a communication.
453 * It takes one parameter.
454 * \param comm the communication to test.
455 * \return the status of the communication:
456 * TRUE : the communication is completed
457 * FALSE: the communication is incompleted
458 * If the status is FALSE, don't forget to use MSG_process_sleep() after the test.
460 int MSG_comm_test(msg_comm_t comm)
462 return SIMIX_req_comm_test(comm);
465 /** \ingroup msg_gos_functions
466 * \brief After received TRUE to MSG_comm_test(), the communication must be destroyed.
468 * It takes one parameter.
469 * \param comm the communication to destroy.
471 void MSG_comm_destroy(msg_comm_t comm)
473 if (SIMIX_req_comm_get_src_proc(comm) != SIMIX_process_self()) {
475 task = (m_task_t) SIMIX_req_comm_get_src_buff(comm);
476 task->simdata->refcount--;
478 SIMIX_req_comm_destroy(comm);
481 /** \ingroup msg_gos_functions
482 * \brief Wait for the completion of a communication.
484 * It takes two parameters.
485 * \param comm the communication to wait.
486 * \param timeout Wait until the communication terminates or the timeout occurs
487 * \return MSG_error_t
489 MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout)
492 MSG_error_t res = MSG_OK;
494 SIMIX_req_comm_wait(comm, timeout);
496 if (SIMIX_req_comm_get_src_proc(comm) != SIMIX_process_self()) {
498 task = (m_task_t) SIMIX_req_comm_get_src_buff(comm);
499 task->simdata->refcount--;
501 SIMIX_req_comm_destroy(comm);
503 /* FIXME: these functions are not tracable */
506 switch (e.category) {
508 res = MSG_HOST_FAILURE;
511 res = MSG_TRANSFER_FAILURE;
517 xbt_die(bprintf("Unhandled SIMIX network exception: %s", e.msg));
524 /** \ingroup msg_gos_functions
525 * \brief This function is called by a sender and permit to wait for each communication
527 * It takes three parameters.
528 * \param comm a vector of communication
529 * \param nb_elem is the size of the comm vector
530 * \param timeout for each call of MSG_comm_wait
532 void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout)
535 for (i = 0; i < nb_elem; i++) {
536 MSG_comm_wait(comm[i], timeout);
540 /** \ingroup msg_gos_functions
541 * \brief This function wait for the first completed communication
543 * It takes on parameter.
544 * \param comms a vector of communication
545 * \return the position of the completed communication from the xbt_dynar_t.
547 int MSG_comm_waitany(xbt_dynar_t comms)
549 return SIMIX_req_comm_waitany(comms);
552 /** \ingroup msg_gos_functions
553 * \brief This function wait for the first completed communication
555 * It takes on parameter.
556 * \param comms a vector of communication
557 * \return the position of the completed communication, if any, or -1 if none was completed
559 int MSG_comm_testany(xbt_dynar_t comms)
561 return SIMIX_req_comm_testany(comms);
564 m_task_t MSG_comm_get_task(msg_comm_t comm)
566 xbt_assert0(comm, "Invalid parameters");
567 return (m_task_t) SIMIX_req_comm_get_src_buff(comm);
570 /** \ingroup msg_gos_functions
571 * \brief Put a task on a channel of an host and waits for the end of the
574 * This function is used for describing the behavior of an agent. It
575 * takes three parameter.
576 * \param task a #m_task_t to send on another location. This task
577 will not be usable anymore when the function will return. There is
578 no automatic task duplication and you have to save your parameters
579 before calling this function. Tasks are unique and once it has been
580 sent to another location, you should not access it anymore. You do
581 not need to call MSG_task_destroy() but to avoid using, as an
582 effect of inattention, this task anymore, you definitely should
583 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
584 can be transfered iff it has been correctly created with
586 * \param dest the destination of the message
587 * \param channel the channel on which the agent should put this
588 task. This value has to be >=0 and < than the maximal number of
589 channels fixed with MSG_set_channel_number().
590 * \return #MSG_FATAL if \a task is not properly initialized and
591 * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
592 * this function was called was shut down. Returns
593 * #MSG_TRANSFER_FAILURE if the transfer could not be properly done
594 * (network failure, dest failure)
596 MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel)
598 return MSG_task_put_with_timeout(task, dest, channel, -1.0);
601 /** \ingroup msg_gos_functions
602 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
608 MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel,
611 task->simdata->rate = maxrate;
612 return MSG_task_put(task, dest, channel);
615 /** \ingroup msg_gos_functions \brief Put a task on a channel of an
616 * host (with a timeout on the waiting of the destination host) and
617 * waits for the end of the transmission.
619 * This function is used for describing the behavior of an agent. It
620 * takes four parameter.
621 * \param task a #m_task_t to send on another location. This task
622 will not be usable anymore when the function will return. There is
623 no automatic task duplication and you have to save your parameters
624 before calling this function. Tasks are unique and once it has been
625 sent to another location, you should not access it anymore. You do
626 not need to call MSG_task_destroy() but to avoid using, as an
627 effect of inattention, this task anymore, you definitely should
628 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
629 can be transfered iff it has been correctly created with
631 * \param dest the destination of the message
632 * \param channel the channel on which the agent should put this
633 task. This value has to be >=0 and < than the maximal number of
634 channels fixed with MSG_set_channel_number().
635 * \param timeout the maximum time to wait for a task before giving
636 up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task
638 * \return #MSG_FATAL if \a task is not properly initialized and
639 #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which
640 this function was called was shut down. Returns
641 #MSG_TRANSFER_FAILURE if the transfer could not be properly done
642 (network failure, dest failure, timeout...)
645 MSG_task_put_with_timeout(m_task_t task, m_host_t dest,
646 m_channel_t channel, double timeout)
648 xbt_assert1((channel >= 0)
649 && (channel < msg_global->max_channel), "Invalid channel %d",
652 DEBUG1("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name);
654 MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel
655 (dest, channel), task, timeout);
658 MSG_error_t MSG_task_send(m_task_t task, const char *alias)
660 DEBUG1("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
661 return MSG_task_send_with_timeout(task, alias, -1);
666 MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate)
668 task->simdata->rate = maxrate;
669 return MSG_task_send(task, alias);
674 MSG_task_send_with_timeout(m_task_t task, const char *alias,
677 return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias),
681 int MSG_task_listen(const char *alias)
685 return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias));
688 /** \ingroup msg_gos_functions
689 * \brief Test whether there is a pending communication on a channel.
691 * It takes one parameter.
692 * \param channel the channel on which the agent should be
693 listening. This value has to be >=0 and < than the maximal
694 number of channels fixed with MSG_set_channel_number().
695 * \return 1 if there is a pending communication and 0 otherwise
697 int MSG_task_Iprobe(m_channel_t channel)
699 xbt_assert1((channel >= 0)
700 && (channel < msg_global->max_channel), "Invalid channel %d",
706 !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel
707 (MSG_host_self(), channel));
710 /** \ingroup msg_gos_functions
712 * \brief Return the number of tasks waiting to be received on a \a
713 channel and sent by \a host.
715 * It takes two parameters.
716 * \param channel the channel on which the agent should be
717 listening. This value has to be >=0 and < than the maximal
718 number of channels fixed with MSG_set_channel_number().
719 * \param host the host that is to be watched.
720 * \return the number of tasks waiting to be received on \a channel
723 int MSG_task_probe_from_host(int channel, m_host_t host)
725 xbt_assert1((channel >= 0)
726 && (channel < msg_global->max_channel), "Invalid channel %d",
732 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel
733 (MSG_host_self(), channel),
738 int MSG_task_listen_from_host(const char *alias, m_host_t host)
743 MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias
747 /** \ingroup msg_gos_functions
748 * \brief Test whether there is a pending communication on a channel, and who sent it.
750 * It takes one parameter.
751 * \param channel the channel on which the agent should be
752 listening. This value has to be >=0 and < than the maximal
753 number of channels fixed with MSG_set_channel_number().
754 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
756 int MSG_task_probe_from(m_channel_t channel)
762 xbt_assert1((channel >= 0)
763 && (channel < msg_global->max_channel), "Invalid channel %d",
768 MSG_mailbox_get_head(MSG_mailbox_get_by_channel
769 (MSG_host_self(), channel))))
772 return MSG_process_get_PID(task->simdata->sender);
775 int MSG_task_listen_from(const char *alias)
782 (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias))))
785 return MSG_process_get_PID(task->simdata->sender);