1 /* Copyright (c) 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. */
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_network, simix,
13 "Logging specific to SIMIX (network)");
15 static xbt_dict_t rdv_points = NULL;
17 static XBT_INLINE void SIMIX_comm_start(smx_action_t action);
18 static void SIMIX_comm_finish(smx_action_t action);
19 static void SIMIX_waitany_req_remove_from_actions(smx_req_t req);
20 static void SIMIX_comm_copy_data(smx_action_t comm);
21 static smx_action_t SIMIX_comm_new(e_smx_comm_type_t type);
22 static XBT_INLINE void SIMIX_comm_wait_for_completion(smx_action_t comm,
24 static XBT_INLINE void SIMIX_rdv_push(smx_rdv_t rdv, smx_action_t comm);
25 static XBT_INLINE void SIMIX_rdv_remove(smx_rdv_t rdv, smx_action_t comm);
26 static smx_action_t SIMIX_rdv_get_request(smx_rdv_t rdv, e_smx_comm_type_t type,
27 int (*match_fun)(void *, void *), void *);
28 static void SIMIX_rdv_free(void *data);
30 void SIMIX_network_init(void)
32 rdv_points = xbt_dict_new();
35 void SIMIX_network_exit(void)
37 xbt_dict_free(&rdv_points);
40 /******************************************************************************/
41 /* Rendez-Vous Points */
42 /******************************************************************************/
44 smx_rdv_t SIMIX_rdv_create(const char *name)
46 /* two processes may have pushed the same rdv_create request at the same time */
47 smx_rdv_t rdv = name ? xbt_dict_get_or_null(rdv_points, name) : NULL;
50 rdv = xbt_new0(s_smx_rvpoint_t, 1);
51 rdv->name = name ? xbt_strdup(name) : NULL;
52 rdv->comm_fifo = xbt_fifo_new();
55 xbt_dict_set(rdv_points, rdv->name, rdv, SIMIX_rdv_free);
60 void SIMIX_rdv_destroy(smx_rdv_t rdv)
63 xbt_dict_remove(rdv_points, rdv->name);
66 void SIMIX_rdv_free(void *data)
68 smx_rdv_t rdv = (smx_rdv_t) data;
71 xbt_fifo_free(rdv->comm_fifo);
75 smx_rdv_t SIMIX_rdv_get_by_name(const char *name)
77 return xbt_dict_get_or_null(rdv_points, name);
80 int SIMIX_rdv_comm_count_by_host(smx_rdv_t rdv, smx_host_t host)
82 smx_action_t comm = NULL;
83 xbt_fifo_item_t item = NULL;
86 xbt_fifo_foreach(rdv->comm_fifo, item, comm, smx_action_t) {
87 if (comm->comm.src_proc->smx_host == host)
94 smx_action_t SIMIX_rdv_get_head(smx_rdv_t rdv)
96 return xbt_fifo_get_item_content(xbt_fifo_get_first_item(rdv->comm_fifo));
100 * \brief Push a communication request into a rendez-vous point
101 * \param rdv The rendez-vous point
102 * \param comm The communication request
104 static XBT_INLINE void SIMIX_rdv_push(smx_rdv_t rdv, smx_action_t comm)
106 xbt_fifo_push(rdv->comm_fifo, comm);
107 comm->comm.rdv = rdv;
111 * \brief Remove a communication request from a rendez-vous point
112 * \param rdv The rendez-vous point
113 * \param comm The communication request
115 static XBT_INLINE void SIMIX_rdv_remove(smx_rdv_t rdv, smx_action_t comm)
117 xbt_fifo_remove(rdv->comm_fifo, comm);
118 comm->comm.rdv = NULL;
122 * \brief Checks if there is a communication action queued in a rendez-vous matching our needs
123 * \param type The type of communication we are looking for (comm_send, comm_recv)
124 * \return The communication action if found, NULL otherwise
126 smx_action_t SIMIX_rdv_get_request(smx_rdv_t rdv, e_smx_comm_type_t type,
127 int (*match_fun)(void *, void *), void *data)
130 xbt_fifo_item_t item;
131 void* req_data = NULL;
133 xbt_fifo_foreach(rdv->comm_fifo, item, action, smx_action_t){
134 if (action->comm.type == SIMIX_COMM_SEND) {
135 req_data = action->comm.src_data;
136 } else if (action->comm.type == SIMIX_COMM_RECEIVE) {
137 req_data = action->comm.dst_data;
139 if (action->comm.type == type && (!match_fun || match_fun(data, req_data))) {
140 DEBUG1("Found a matching communication action %p", action);
141 xbt_fifo_remove_item(rdv->comm_fifo, item);
142 xbt_fifo_free_item(item);
143 action->comm.refcount++;
144 action->comm.rdv = NULL;
147 DEBUG3("Sorry, communication action %p does not match our needs:"
148 " its type is %d but we are looking for a comm of type %d",
149 action, action->comm.type, type);
151 DEBUG0("No matching communication action found");
155 /******************************************************************************/
156 /* Comunication Actions */
157 /******************************************************************************/
160 * \brief Creates a new comunicate action
161 * \param type The type of request (comm_send, comm_recv)
162 * \return The new comunicate action
164 smx_action_t SIMIX_comm_new(e_smx_comm_type_t type)
168 /* alloc structures */
169 act = xbt_new0(s_smx_action_t, 1);
170 act->type = SIMIX_ACTION_COMMUNICATE;
171 act->state = SIMIX_WAITING;
172 act->request_list = xbt_fifo_new();
174 /* set communication */
175 act->comm.type = type;
176 act->comm.refcount = 1;
178 #ifdef HAVE_LATENCY_BOUND_TRACKING
179 //initialize with unknown value
180 act->latency_limited = -1;
184 act->category = NULL;
187 DEBUG1("Create communicate action %p", act);
193 * \brief Destroy a communicate action
194 * \param action The communicate action to be destroyed
196 void SIMIX_comm_destroy(smx_action_t action)
198 DEBUG2("Destroy action %p (refcount:%d)", action, action->comm.refcount);
200 if (action->comm.refcount <= 0)
201 xbt_die(bprintf("the refcount of comm %p is already 0 before decreasing it. That's a bug!",action));
203 action->comm.refcount--;
204 if (action->comm.refcount > 0)
206 DEBUG2("Really free communication %p; refcount is now %d", action,
207 action->comm.refcount);
209 #ifdef HAVE_LATENCY_BOUND_TRACKING
210 action->latency_limited = SIMIX_comm_is_latency_bounded( action ) ;
214 TRACE_smx_action_destroy(action);
218 xbt_free(action->name);
220 xbt_fifo_free(action->request_list);
222 SIMIX_comm_destroy_internal_actions(action);
227 void SIMIX_comm_destroy_internal_actions(smx_action_t action)
229 if (action->comm.surf_comm){
230 #ifdef HAVE_LATENCY_BOUND_TRACKING
231 action->latency_limited = SIMIX_comm_is_latency_bounded(action);
233 action->comm.surf_comm->model_type->action_unref(action->comm.surf_comm);
234 action->comm.surf_comm = NULL;
237 if (action->comm.src_timeout){
238 action->comm.src_timeout->model_type->action_unref(action->comm.src_timeout);
239 action->comm.src_timeout = NULL;
242 if (action->comm.dst_timeout){
243 action->comm.dst_timeout->model_type->action_unref(action->comm.dst_timeout);
244 action->comm.dst_timeout = NULL;
248 smx_action_t SIMIX_comm_isend(smx_process_t src_proc, smx_rdv_t rdv,
249 double task_size, double rate,
250 void *src_buff, size_t src_buff_size,
251 int (*match_fun)(void *, void *), void *data)
255 /* Look for communication request matching our needs.
256 If it is not found then create it and push it into the rendez-vous point */
257 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_RECEIVE, match_fun, data);
260 action = SIMIX_comm_new(SIMIX_COMM_SEND);
261 SIMIX_rdv_push(rdv, action);
263 action->state = SIMIX_READY;
264 action->comm.type = SIMIX_COMM_READY;
267 /* Setup the communication request */
268 action->comm.src_proc = src_proc;
269 action->comm.task_size = task_size;
270 action->comm.rate = rate;
271 action->comm.src_buff = src_buff;
272 action->comm.src_buff_size = src_buff_size;
273 action->comm.src_data = data;
276 action->state = SIMIX_RUNNING;
280 SIMIX_comm_start(action);
284 smx_action_t SIMIX_comm_irecv(smx_process_t dst_proc, smx_rdv_t rdv,
285 void *dst_buff, size_t *dst_buff_size,
286 int (*match_fun)(void *, void *), void *data)
290 /* Look for communication request matching our needs.
291 * If it is not found then create it and push it into the rendez-vous point
293 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_SEND, match_fun, data);
296 action = SIMIX_comm_new(SIMIX_COMM_RECEIVE);
297 SIMIX_rdv_push(rdv, action);
299 action->state = SIMIX_READY;
300 action->comm.type = SIMIX_COMM_READY;
303 /* Setup communication request */
304 action->comm.dst_proc = dst_proc;
305 action->comm.dst_buff = dst_buff;
306 action->comm.dst_buff_size = dst_buff_size;
307 action->comm.dst_data = data;
310 action->state = SIMIX_RUNNING;
314 SIMIX_comm_start(action);
318 void SIMIX_pre_comm_wait(smx_req_t req, int idx)
320 smx_action_t action = req->comm_wait.comm;
321 double timeout = req->comm_wait.timeout;
324 /* Associate this request to the action */
325 xbt_fifo_push(action->request_list, req);
326 req->issuer->waiting_action = action;
330 action->state = SIMIX_DONE;
332 /* If we reached this point, the wait request must have a timeout */
333 /* Otherwise it shouldn't be enabled and executed by the MC */
337 if(action->comm.src_proc == req->issuer)
338 action->state = SIMIX_SRC_TIMEOUT;
340 action->state = SIMIX_DST_TIMEOUT;
343 SIMIX_comm_finish(action);
347 /* If the action has already finish perform the error handling, */
348 /* otherwise set up a waiting timeout on the right side */
349 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
350 SIMIX_comm_finish(action);
351 } else { /* if (timeout >= 0) { we need a surf sleep action even when there is no timeout, otherwise surf won't tell us when the host fails */
352 sleep = surf_workstation_model->extension.workstation.sleep(req->issuer->smx_host->host, timeout);
353 surf_workstation_model->action_data_set(sleep, action);
355 if (req->issuer == action->comm.src_proc)
356 action->comm.src_timeout = sleep;
358 action->comm.dst_timeout = sleep;
362 void SIMIX_pre_comm_test(smx_req_t req)
364 smx_action_t action = req->comm_test.comm;
365 req->comm_test.result = (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING);
367 if (req->comm_test.result) {
368 xbt_fifo_push(action->request_list, req);
369 SIMIX_comm_finish(action);
371 SIMIX_request_answer(req);
375 void SIMIX_pre_comm_testany(smx_req_t req, int idx)
379 xbt_dynar_t actions = req->comm_testany.comms;
380 req->comm_testany.result = -1;
384 SIMIX_request_answer(req);
386 action = xbt_dynar_get_as(actions, idx, smx_action_t);
387 xbt_fifo_push(action->request_list, req);
388 action->state = SIMIX_DONE;
389 SIMIX_comm_finish(action);
394 xbt_dynar_foreach(req->comm_testany.comms,cursor,action) {
395 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
396 req->comm_testany.result = cursor;
397 xbt_fifo_push(action->request_list, req);
398 SIMIX_comm_finish(action);
402 SIMIX_request_answer(req);
405 void SIMIX_pre_comm_waitany(smx_req_t req, int idx)
408 unsigned int cursor = 0;
409 xbt_dynar_t actions = req->comm_waitany.comms;
412 action = xbt_dynar_get_as(actions, idx, smx_action_t);
413 xbt_fifo_push(action->request_list, req);
414 req->comm_waitany.result = idx;
415 action->state = SIMIX_DONE;
416 SIMIX_comm_finish(action);
420 xbt_dynar_foreach(actions, cursor, action){
421 /* Associate this request to the action */
422 xbt_fifo_push(action->request_list, req);
423 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING){
424 SIMIX_comm_finish(action);
430 void SIMIX_waitany_req_remove_from_actions(smx_req_t req)
433 unsigned int cursor = 0;
434 xbt_dynar_t actions = req->comm_waitany.comms;
436 xbt_dynar_foreach(actions, cursor, action){
437 xbt_fifo_remove(action->request_list, req);
442 * \brief Start the simulation of a communication request
443 * \param action The communication action
445 static XBT_INLINE void SIMIX_comm_start(smx_action_t action)
447 /* If both the sender and the receiver are already there, start the communication */
448 if (action->state == SIMIX_READY) {
449 smx_host_t sender = action->comm.src_proc->smx_host;
450 smx_host_t receiver = action->comm.dst_proc->smx_host;
452 DEBUG3("Starting communication %p from '%s' to '%s'", action,
453 SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
455 action->comm.surf_comm = surf_workstation_model->extension.workstation.
456 communicate(sender->host, receiver->host, action->comm.task_size, action->comm.rate);
458 surf_workstation_model->action_data_set(action->comm.surf_comm, action);
460 action->state = SIMIX_RUNNING;
463 TRACE_smx_action_communicate(action, action->comm.src_proc);
466 /* If a link is failed, detect it immediately */
467 if (surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED) {
468 DEBUG2("Communication from '%s' to '%s' failed to start because of a link failure",
469 SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
470 action->state = SIMIX_LINK_FAILURE;
471 SIMIX_comm_destroy_internal_actions(action);
474 /* If any of the process is suspend, create the action but stop its execution,
475 it will be restarted when the sender process resume */
476 if (SIMIX_process_is_suspended(action->comm.src_proc) ||
477 SIMIX_process_is_suspended(action->comm.dst_proc)) {
478 /* FIXME: check what should happen with the action state */
479 surf_workstation_model->suspend(action->comm.surf_comm);
484 void SIMIX_comm_finish(smx_action_t action)
488 while ((req = xbt_fifo_shift(action->request_list))) {
490 /* If a waitany request is waiting for this action to finish, then remove
491 it from the other actions in the waitany list. Afterwards, get the
492 position of the actual action in the waitany request's actions dynar and
493 return it as the result of the call */
494 if (req->call == REQ_COMM_WAITANY) {
495 SIMIX_waitany_req_remove_from_actions(req);
497 req->comm_waitany.result = xbt_dynar_search(req->comm_waitany.comms, &action);
500 /* If the action is still in a rendez-vous point then remove from it */
501 if (action->comm.rdv)
502 SIMIX_rdv_remove(action->comm.rdv, action);
504 DEBUG1("SIMIX_comm_finish: action state = %d", action->state);
506 /* Check out for errors */
507 switch (action->state) {
510 DEBUG1("Communication %p complete!", action);
511 SIMIX_comm_copy_data(action);
514 case SIMIX_SRC_TIMEOUT:
516 THROW0(timeout_error, 0, "Communication timeouted because of sender");
518 CATCH(req->issuer->running_ctx->exception) {
519 req->issuer->doexception = 1;
523 case SIMIX_DST_TIMEOUT:
525 THROW0(timeout_error, 0, "Communication timeouted because of receiver");
527 CATCH(req->issuer->running_ctx->exception) {
528 req->issuer->doexception = 1;
532 case SIMIX_SRC_HOST_FAILURE:
534 if (req->issuer == action->comm.src_proc)
535 THROW0(host_error, 0, "Host failed");
537 THROW0(network_error, 0, "Remote peer failed");
539 CATCH(req->issuer->running_ctx->exception) {
540 req->issuer->doexception = 1;
544 case SIMIX_DST_HOST_FAILURE:
546 if (req->issuer == action->comm.dst_proc)
547 THROW0(host_error, 0, "Host failed");
549 THROW0(network_error, 0, "Remote peer failed");
551 CATCH(req->issuer->running_ctx->exception) {
552 req->issuer->doexception = 1;
556 case SIMIX_LINK_FAILURE:
558 DEBUG5("Link failure in action %p between '%s' and '%s': posting an exception to the issuer: %s (%p)",
559 action, action->comm.src_proc->smx_host->name, action->comm.dst_proc->smx_host->name,
560 req->issuer->name, req->issuer);
561 THROW0(network_error, 0, "Link failure");
563 CATCH(req->issuer->running_ctx->exception) {
564 req->issuer->doexception = 1;
572 /* if there is an exception during a waitany or a testany, indicate the position of the failed communication */
573 if (req->issuer->doexception) {
574 if (req->call == REQ_COMM_WAITANY) {
575 req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_waitany.comms, &action);
577 else if (req->call == REQ_COMM_TESTANY) {
578 req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_testany.comms, &action);
582 req->issuer->waiting_action = NULL;
583 SIMIX_request_answer(req);
587 void SIMIX_post_comm(smx_action_t action)
589 /* Update action state */
590 if (action->comm.src_timeout &&
591 surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_DONE)
592 action->state = SIMIX_SRC_TIMEOUT;
593 else if (action->comm.dst_timeout &&
594 surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_DONE)
595 action->state = SIMIX_DST_TIMEOUT;
596 else if (action->comm.src_timeout &&
597 surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_FAILED)
598 action->state = SIMIX_SRC_HOST_FAILURE;
599 else if (action->comm.dst_timeout &&
600 surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_FAILED)
601 action->state = SIMIX_DST_HOST_FAILURE;
602 else if (action->comm.surf_comm &&
603 surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED)
604 action->state = SIMIX_LINK_FAILURE;
606 action->state = SIMIX_DONE;
608 DEBUG1("SIMIX_post_comm: action state = %d", action->state);
610 /* After this point the surf actions associated with the simix communicate
611 action are no longer needed, thus we delete them. */
612 SIMIX_comm_destroy_internal_actions(action);
614 /* If there are requests associated with the action, then answer them */
615 if (xbt_fifo_size(action->request_list))
616 SIMIX_comm_finish(action);
619 void SIMIX_comm_cancel(smx_action_t action)
621 /* If the action is a waiting state means that it is still in a rdv */
622 /* so remove from it and delete it */
623 if (action->state == SIMIX_WAITING) {
624 SIMIX_rdv_remove(action->comm.rdv, action);
625 action->state = SIMIX_FAILED;
627 /* When running the MC there are no surf actions */
629 surf_workstation_model->action_cancel(action->comm.surf_comm);
633 void SIMIX_comm_suspend(smx_action_t action)
635 /*FIXME: shall we suspend also the timeout actions? */
636 surf_workstation_model->suspend(action->comm.surf_comm);
639 void SIMIX_comm_resume(smx_action_t action)
641 /*FIXME: check what happen with the timeouts */
642 surf_workstation_model->resume(action->comm.surf_comm);
646 /************* Action Getters **************/
649 * \brief get the amount remaining from the communication
650 * \param action The communication
652 double SIMIX_comm_get_remains(smx_action_t action)
656 switch (action->state) {
659 remains = surf_workstation_model->get_remains(action->comm.surf_comm);
664 remains = 0; /*FIXME: check what should be returned */
668 remains = 0; /*FIXME: is this correct? */
674 e_smx_state_t SIMIX_comm_get_state(smx_action_t action)
676 return action->state;
680 * \brief Return the user data associated to the sender of the communication
681 * \param action The communication
682 * \return the user data
684 void* SIMIX_comm_get_src_data(smx_action_t action)
686 return action->comm.src_data;
690 * \brief Return the user data associated to the receiver of the communication
691 * \param action The communication
692 * \return the user data
694 void* SIMIX_comm_get_dst_data(smx_action_t action)
696 return action->comm.dst_data;
699 void* SIMIX_comm_get_src_buff(smx_action_t action)
701 return action->comm.src_buff;
704 void* SIMIX_comm_get_dst_buff(smx_action_t action)
706 return action->comm.dst_buff;
709 size_t SIMIX_comm_get_src_buff_size(smx_action_t action)
711 return action->comm.src_buff_size;
714 size_t SIMIX_comm_get_dst_buff_size(smx_action_t action)
718 if (action->comm.dst_buff_size)
719 buff_size = *(action->comm.dst_buff_size);
726 smx_process_t SIMIX_comm_get_src_proc(smx_action_t action)
728 return action->comm.src_proc;
731 smx_process_t SIMIX_comm_get_dst_proc(smx_action_t action)
733 return action->comm.dst_proc;
736 #ifdef HAVE_LATENCY_BOUND_TRACKING
738 * \brief verify if communication is latency bounded
739 * \param comm The communication
741 XBT_INLINE int SIMIX_comm_is_latency_bounded(smx_action_t action)
743 if (action->comm.surf_comm){
744 DEBUG1("Getting latency limited for surf_action (%p)", action->comm.surf_comm);
745 action->latency_limited = surf_workstation_model->get_latency_limited(action->comm.surf_comm);
746 DEBUG1("Action limited is %d", action->latency_limited);
748 return action->latency_limited;
752 /******************************************************************************/
753 /* SIMIX_comm_copy_data callbacks */
754 /******************************************************************************/
755 static void (*SIMIX_comm_copy_data_callback) (smx_action_t, size_t) =
756 &SIMIX_comm_copy_pointer_callback;
759 SIMIX_comm_set_copy_data_callback(void (*callback) (smx_action_t, size_t))
761 SIMIX_comm_copy_data_callback = callback;
764 void SIMIX_comm_copy_pointer_callback(smx_action_t comm, size_t buff_size)
766 xbt_assert1((buff_size == sizeof(void *)),
767 "Cannot copy %zu bytes: must be sizeof(void*)", buff_size);
768 *(void **) (comm->comm.dst_buff) = comm->comm.src_buff;
771 void SIMIX_comm_copy_buffer_callback(smx_action_t comm, size_t buff_size)
773 memcpy(comm->comm.dst_buff, comm->comm.src_buff, buff_size);
777 * \brief Copy the communication data from the sender's buffer to the receiver's one
778 * \param comm The communication
780 void SIMIX_comm_copy_data(smx_action_t comm)
782 size_t buff_size = comm->comm.src_buff_size;
783 /* If there is no data to be copy then return */
784 if (!comm->comm.src_buff || !comm->comm.dst_buff || comm->comm.copied == 1)
787 DEBUG6("Copying comm %p data from %s (%p) -> %s (%p) (%zu bytes)",
789 comm->comm.src_proc->smx_host->name, comm->comm.src_buff,
790 comm->comm.dst_proc->smx_host->name, comm->comm.dst_buff, buff_size);
792 /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
793 if (comm->comm.dst_buff_size)
794 buff_size = MIN(buff_size, *(comm->comm.dst_buff_size));
796 /* Update the receiver's buffer size to the copied amount */
797 if (comm->comm.dst_buff_size)
798 *comm->comm.dst_buff_size = buff_size;
803 (*SIMIX_comm_copy_data_callback) (comm, buff_size);
805 /* Set the copied flag so we copy data only once */
806 /* (this function might be called from both communication ends) */
807 comm->comm.copied = 1;