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;
16 unsigned long int smx_total_comms = 0;
18 static void SIMIX_waitany_req_remove_from_actions(smx_req_t req);
19 static void SIMIX_comm_copy_data(smx_action_t comm);
20 static smx_action_t SIMIX_comm_new(e_smx_comm_type_t type);
21 static XBT_INLINE void SIMIX_rdv_push(smx_rdv_t rdv, smx_action_t comm);
22 static XBT_INLINE void SIMIX_rdv_remove(smx_rdv_t rdv, smx_action_t comm);
23 static smx_action_t SIMIX_rdv_get_request(smx_rdv_t rdv, e_smx_comm_type_t type,
24 int (*match_fun)(void *, void *), void *);
25 static void SIMIX_rdv_free(void *data);
27 void SIMIX_network_init(void)
29 rdv_points = xbt_dict_new();
32 void SIMIX_network_exit(void)
34 xbt_dict_free(&rdv_points);
37 /******************************************************************************/
38 /* Rendez-Vous Points */
39 /******************************************************************************/
41 smx_rdv_t SIMIX_rdv_create(const char *name)
43 /* two processes may have pushed the same rdv_create request at the same time */
44 smx_rdv_t rdv = name ? xbt_dict_get_or_null(rdv_points, name) : NULL;
47 rdv = xbt_new0(s_smx_rvpoint_t, 1);
48 rdv->name = name ? xbt_strdup(name) : NULL;
49 rdv->comm_fifo = xbt_fifo_new();
52 xbt_dict_set(rdv_points, rdv->name, rdv, SIMIX_rdv_free);
57 void SIMIX_rdv_destroy(smx_rdv_t rdv)
60 xbt_dict_remove(rdv_points, rdv->name);
63 void SIMIX_rdv_free(void *data)
65 smx_rdv_t rdv = (smx_rdv_t) data;
67 xbt_fifo_free(rdv->comm_fifo);
71 smx_rdv_t SIMIX_rdv_get_by_name(const char *name)
73 return xbt_dict_get_or_null(rdv_points, name);
76 int SIMIX_rdv_comm_count_by_host(smx_rdv_t rdv, smx_host_t host)
78 smx_action_t comm = NULL;
79 xbt_fifo_item_t item = NULL;
82 xbt_fifo_foreach(rdv->comm_fifo, item, comm, smx_action_t) {
83 if (comm->comm.src_proc->smx_host == host)
90 smx_action_t SIMIX_rdv_get_head(smx_rdv_t rdv)
92 return xbt_fifo_get_item_content(xbt_fifo_get_first_item(rdv->comm_fifo));
96 * \brief Push a communication request into a rendez-vous point
97 * \param rdv The rendez-vous point
98 * \param comm The communication request
100 static XBT_INLINE void SIMIX_rdv_push(smx_rdv_t rdv, smx_action_t comm)
102 xbt_fifo_push(rdv->comm_fifo, comm);
103 comm->comm.rdv = rdv;
107 * \brief Remove a communication request from a rendez-vous point
108 * \param rdv The rendez-vous point
109 * \param comm The communication request
111 static XBT_INLINE void SIMIX_rdv_remove(smx_rdv_t rdv, smx_action_t comm)
113 xbt_fifo_remove(rdv->comm_fifo, comm);
114 comm->comm.rdv = NULL;
118 * \brief Wrapper to SIMIX_rdv_get_request
120 smx_action_t SIMIX_comm_get_send_match(smx_rdv_t rdv, int (*match_fun)(void*, void*), void* data) {
121 return SIMIX_rdv_get_request(rdv, SIMIX_COMM_SEND, match_fun, data);
125 * \brief Checks if there is a communication action queued in a rendez-vous matching our needs
126 * \param type The type of communication we are looking for (comm_send, comm_recv)
127 * \return The communication action if found, NULL otherwise
129 smx_action_t SIMIX_rdv_get_request(smx_rdv_t rdv, e_smx_comm_type_t type,
130 int (*match_fun)(void *, void *), void *data)
132 // FIXME rewrite this function by using SIMIX_rdv_has_send/recv_match
134 xbt_fifo_item_t item;
135 void* req_data = NULL;
137 xbt_fifo_foreach(rdv->comm_fifo, item, action, smx_action_t){
138 if (action->comm.type == SIMIX_COMM_SEND) {
139 req_data = action->comm.src_data;
140 } else if (action->comm.type == SIMIX_COMM_RECEIVE) {
141 req_data = action->comm.dst_data;
143 if (action->comm.type == type && (!match_fun || match_fun(data, req_data))) {
144 XBT_DEBUG("Found a matching communication action %p", action);
145 xbt_fifo_remove_item(rdv->comm_fifo, item);
146 xbt_fifo_free_item(item);
147 action->comm.refcount++;
148 action->comm.rdv = NULL;
151 XBT_DEBUG("Sorry, communication action %p does not match our needs:"
152 " its type is %d but we are looking for a comm of type %d",
153 action, action->comm.type, type);
155 XBT_DEBUG("No matching communication action found");
160 * \brief Checks if there is a send communication action
161 * queued in a rendez-vous matching our needs.
162 * \return 1 if found, 0 otherwise
164 int SIMIX_comm_has_send_match(smx_rdv_t rdv, int (*match_fun)(void*, void*), void* data) {
167 xbt_fifo_item_t item;
169 xbt_fifo_foreach(rdv->comm_fifo, item, action, smx_action_t){
170 if (action->comm.type == SIMIX_COMM_SEND
171 && (!match_fun || match_fun(data, action->comm.src_data))) {
172 XBT_DEBUG("Found a matching communication action %p", action);
176 XBT_DEBUG("No matching communication action found");
181 * \brief Checks if there is a recv communication action
182 * queued in a rendez-vous matching our needs.
183 * \return 1 if found, 0 otherwise
185 int SIMIX_comm_has_recv_match(smx_rdv_t rdv, int (*match_fun)(void*, void*), void* data) {
188 xbt_fifo_item_t item;
190 xbt_fifo_foreach(rdv->comm_fifo, item, action, smx_action_t){
191 if (action->comm.type == SIMIX_COMM_RECEIVE
192 && (!match_fun || match_fun(data, action->comm.dst_data))) {
193 XBT_DEBUG("Found a matching communication action %p", action);
197 XBT_DEBUG("No matching communication action found");
201 /******************************************************************************/
202 /* Comunication Actions */
203 /******************************************************************************/
206 * \brief Creates a new comunicate action
207 * \param type The type of request (comm_send, comm_recv)
208 * \return The new comunicate action
210 smx_action_t SIMIX_comm_new(e_smx_comm_type_t type)
214 /* alloc structures */
215 act = xbt_mallocator_get(simix_global->action_mallocator);
216 act->type = SIMIX_ACTION_COMMUNICATE;
217 act->state = SIMIX_WAITING;
219 /* set communication */
220 act->comm.type = type;
221 act->comm.refcount = 1;
223 #ifdef HAVE_LATENCY_BOUND_TRACKING
224 //initialize with unknown value
225 act->latency_limited = -1;
229 act->category = NULL;
232 XBT_DEBUG("Create communicate action %p", act);
239 * \brief Destroy a communicate action
240 * \param action The communicate action to be destroyed
242 void SIMIX_comm_destroy(smx_action_t action)
244 XBT_DEBUG("Destroy action %p (refcount:%d)", action, action->comm.refcount);
246 if (action->comm.refcount <= 0)
247 xbt_die("the refcount of comm %p is already 0 before decreasing it. "
248 "That's a bug!", action);
250 action->comm.refcount--;
251 if (action->comm.refcount > 0)
253 XBT_DEBUG("Really free communication %p; refcount is now %d", action,
254 action->comm.refcount);
256 #ifdef HAVE_LATENCY_BOUND_TRACKING
257 action->latency_limited = SIMIX_comm_is_latency_bounded( action ) ;
260 xbt_free(action->name);
261 SIMIX_comm_destroy_internal_actions(action);
263 if (action->comm.detached && action->state != SIMIX_DONE) {
264 /* the communication has failed and was detached:
265 * we have to free the buffer */
266 ((void_f_pvoid_t) action->comm.src_data)(action->comm.src_buff);
269 xbt_mallocator_release(simix_global->action_mallocator, action);
272 void SIMIX_comm_destroy_internal_actions(smx_action_t action)
274 if (action->comm.surf_comm){
275 #ifdef HAVE_LATENCY_BOUND_TRACKING
276 action->latency_limited = SIMIX_comm_is_latency_bounded(action);
278 action->comm.surf_comm->model_type->action_unref(action->comm.surf_comm);
279 action->comm.surf_comm = NULL;
282 if (action->comm.src_timeout){
283 action->comm.src_timeout->model_type->action_unref(action->comm.src_timeout);
284 action->comm.src_timeout = NULL;
287 if (action->comm.dst_timeout){
288 action->comm.dst_timeout->model_type->action_unref(action->comm.dst_timeout);
289 action->comm.dst_timeout = NULL;
293 smx_action_t SIMIX_comm_isend(smx_process_t src_proc, smx_rdv_t rdv,
294 double task_size, double rate,
295 void *src_buff, size_t src_buff_size,
296 int (*match_fun)(void *, void *), void *data,
301 /* Look for communication request matching our needs.
302 If it is not found then create it and push it into the rendez-vous point */
303 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_RECEIVE, match_fun, data);
306 action = SIMIX_comm_new(SIMIX_COMM_SEND);
307 SIMIX_rdv_push(rdv, action);
309 action->state = SIMIX_READY;
310 action->comm.type = SIMIX_COMM_READY;
312 xbt_fifo_push(src_proc->comms, action);
314 /* if the communication action is detached then decrease the refcount
315 * by one, so it will be eliminated by the receiver's destroy call */
317 action->comm.detached = 1;
318 action->comm.refcount--;
321 /* Setup the communication request */
322 action->comm.src_proc = src_proc;
323 action->comm.task_size = task_size;
324 action->comm.rate = rate;
325 action->comm.src_buff = src_buff;
326 action->comm.src_buff_size = src_buff_size;
327 action->comm.src_data = data;
330 action->state = SIMIX_RUNNING;
334 SIMIX_comm_start(action);
338 smx_action_t SIMIX_comm_irecv(smx_process_t dst_proc, smx_rdv_t rdv,
339 void *dst_buff, size_t *dst_buff_size,
340 int (*match_fun)(void *, void *), void *data)
344 /* Look for communication request matching our needs.
345 * If it is not found then create it and push it into the rendez-vous point
347 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_SEND, match_fun, data);
350 action = SIMIX_comm_new(SIMIX_COMM_RECEIVE);
351 SIMIX_rdv_push(rdv, action);
353 action->state = SIMIX_READY;
354 action->comm.type = SIMIX_COMM_READY;
356 xbt_fifo_push(dst_proc->comms, action);
358 /* Setup communication request */
359 action->comm.dst_proc = dst_proc;
360 action->comm.dst_buff = dst_buff;
361 action->comm.dst_buff_size = dst_buff_size;
362 action->comm.dst_data = data;
365 action->state = SIMIX_RUNNING;
369 SIMIX_comm_start(action);
373 void SIMIX_pre_comm_wait(smx_req_t req, smx_action_t action, double timeout, int idx)
375 /* the request may be a wait, a send or a recv */
378 /* Associate this request to the action */
379 xbt_fifo_push(action->request_list, req);
380 req->issuer->waiting_action = action;
384 action->state = SIMIX_DONE;
386 /* If we reached this point, the wait request must have a timeout */
387 /* Otherwise it shouldn't be enabled and executed by the MC */
391 if (action->comm.src_proc == req->issuer)
392 action->state = SIMIX_SRC_TIMEOUT;
394 action->state = SIMIX_DST_TIMEOUT;
397 SIMIX_comm_finish(action);
401 /* If the action has already finish perform the error handling, */
402 /* otherwise set up a waiting timeout on the right side */
403 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
404 SIMIX_comm_finish(action);
405 } 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 */
406 sleep = surf_workstation_model->extension.workstation.sleep(req->issuer->smx_host->host, timeout);
407 surf_workstation_model->action_data_set(sleep, action);
409 if (req->issuer == action->comm.src_proc)
410 action->comm.src_timeout = sleep;
412 action->comm.dst_timeout = sleep;
416 void SIMIX_pre_comm_test(smx_req_t req)
418 smx_action_t action = req->comm_test.comm;
421 req->comm_test.result = action->comm.src_proc && action->comm.dst_proc;
422 if(req->comm_test.result){
423 action->state = SIMIX_DONE;
424 xbt_fifo_push(action->request_list, req);
425 SIMIX_comm_finish(action);
427 SIMIX_request_answer(req);
432 req->comm_test.result = (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING);
433 if (req->comm_test.result) {
434 xbt_fifo_push(action->request_list, req);
435 SIMIX_comm_finish(action);
437 SIMIX_request_answer(req);
441 void SIMIX_pre_comm_testany(smx_req_t req, int idx)
445 xbt_dynar_t actions = req->comm_testany.comms;
446 req->comm_testany.result = -1;
450 SIMIX_request_answer(req);
452 action = xbt_dynar_get_as(actions, idx, smx_action_t);
453 req->comm_testany.result = idx;
454 xbt_fifo_push(action->request_list, req);
455 action->state = SIMIX_DONE;
456 SIMIX_comm_finish(action);
461 xbt_dynar_foreach(req->comm_testany.comms,cursor,action) {
462 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
463 req->comm_testany.result = cursor;
464 xbt_fifo_push(action->request_list, req);
465 SIMIX_comm_finish(action);
469 SIMIX_request_answer(req);
472 void SIMIX_pre_comm_waitany(smx_req_t req, int idx)
475 unsigned int cursor = 0;
476 xbt_dynar_t actions = req->comm_waitany.comms;
479 action = xbt_dynar_get_as(actions, idx, smx_action_t);
480 xbt_fifo_push(action->request_list, req);
481 req->comm_waitany.result = idx;
482 action->state = SIMIX_DONE;
483 SIMIX_comm_finish(action);
487 xbt_dynar_foreach(actions, cursor, action){
488 /* Associate this request to the action */
489 xbt_fifo_push(action->request_list, req);
490 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING){
491 SIMIX_comm_finish(action);
497 void SIMIX_waitany_req_remove_from_actions(smx_req_t req)
500 unsigned int cursor = 0;
501 xbt_dynar_t actions = req->comm_waitany.comms;
503 xbt_dynar_foreach(actions, cursor, action){
504 xbt_fifo_remove(action->request_list, req);
509 * \brief Start the simulation of a communication request
510 * \param action The communication action
513 XBT_INLINE void SIMIX_comm_start(smx_action_t action)
515 /* If both the sender and the receiver are already there, start the communication */
516 if (action->state == SIMIX_READY) {
518 smx_host_t sender = action->comm.src_proc->smx_host;
519 smx_host_t receiver = action->comm.dst_proc->smx_host;
521 XBT_DEBUG("Starting communication %p from '%s' to '%s'", action,
522 SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
524 action->comm.surf_comm = surf_workstation_model->extension.workstation.
525 communicate(sender->host, receiver->host, action->comm.task_size, action->comm.rate);
527 surf_workstation_model->action_data_set(action->comm.surf_comm, action);
529 action->state = SIMIX_RUNNING;
531 /* If a link is failed, detect it immediately */
532 if (surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED) {
533 XBT_DEBUG("Communication from '%s' to '%s' failed to start because of a link failure",
534 SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
535 action->state = SIMIX_LINK_FAILURE;
536 SIMIX_comm_destroy_internal_actions(action);
539 /* If any of the process is suspend, create the action but stop its execution,
540 it will be restarted when the sender process resume */
541 if (SIMIX_process_is_suspended(action->comm.src_proc) ||
542 SIMIX_process_is_suspended(action->comm.dst_proc)) {
543 /* FIXME: check what should happen with the action state */
544 surf_workstation_model->suspend(action->comm.surf_comm);
549 void SIMIX_comm_finish(smx_action_t action)
551 unsigned int destroy_count = 0;
554 while ((req = xbt_fifo_shift(action->request_list))) {
556 /* If a waitany request is waiting for this action to finish, then remove
557 it from the other actions in the waitany list. Afterwards, get the
558 position of the actual action in the waitany request's actions dynar and
559 return it as the result of the call */
560 if (req->call == REQ_COMM_WAITANY) {
561 SIMIX_waitany_req_remove_from_actions(req);
563 req->comm_waitany.result = xbt_dynar_search(req->comm_waitany.comms, &action);
566 /* If the action is still in a rendez-vous point then remove from it */
567 if (action->comm.rdv)
568 SIMIX_rdv_remove(action->comm.rdv, action);
570 XBT_DEBUG("SIMIX_comm_finish: action state = %d", action->state);
572 /* Check out for errors */
573 switch (action->state) {
576 XBT_DEBUG("Communication %p complete!", action);
577 SIMIX_comm_copy_data(action);
580 case SIMIX_SRC_TIMEOUT:
582 THROWF(timeout_error, 0, "Communication timeouted because of sender");
584 CATCH(req->issuer->running_ctx->exception) {
585 req->issuer->doexception = 1;
589 case SIMIX_DST_TIMEOUT:
591 THROWF(timeout_error, 0, "Communication timeouted because of receiver");
593 CATCH(req->issuer->running_ctx->exception) {
594 req->issuer->doexception = 1;
598 case SIMIX_SRC_HOST_FAILURE:
600 if (req->issuer == action->comm.src_proc)
601 THROWF(host_error, 0, "Host failed");
603 THROWF(network_error, 0, "Remote peer failed");
605 CATCH(req->issuer->running_ctx->exception) {
606 req->issuer->doexception = 1;
610 case SIMIX_DST_HOST_FAILURE:
612 if (req->issuer == action->comm.dst_proc)
613 THROWF(host_error, 0, "Host failed");
615 THROWF(network_error, 0, "Remote peer failed");
617 CATCH(req->issuer->running_ctx->exception) {
618 req->issuer->doexception = 1;
622 case SIMIX_LINK_FAILURE:
624 XBT_DEBUG("Link failure in action %p between '%s' and '%s': posting an exception to the issuer: %s (%p)",
625 action, action->comm.src_proc->smx_host->name, action->comm.dst_proc->smx_host->name,
626 req->issuer->name, req->issuer);
627 THROWF(network_error, 0, "Link failure");
629 CATCH(req->issuer->running_ctx->exception) {
630 req->issuer->doexception = 1;
638 /* if there is an exception during a waitany or a testany, indicate the position of the failed communication */
639 if (req->issuer->doexception) {
640 if (req->call == REQ_COMM_WAITANY) {
641 req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_waitany.comms, &action);
643 else if (req->call == REQ_COMM_TESTANY) {
644 req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_testany.comms, &action);
648 req->issuer->waiting_action = NULL;
649 SIMIX_request_answer(req);
653 while (destroy_count-- > 0)
654 SIMIX_comm_destroy(action);
657 void SIMIX_post_comm(smx_action_t action)
659 /* Update action state */
660 if (action->comm.src_timeout &&
661 surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_DONE)
662 action->state = SIMIX_SRC_TIMEOUT;
663 else if (action->comm.dst_timeout &&
664 surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_DONE)
665 action->state = SIMIX_DST_TIMEOUT;
666 else if (action->comm.src_timeout &&
667 surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_FAILED)
668 action->state = SIMIX_SRC_HOST_FAILURE;
669 else if (action->comm.dst_timeout &&
670 surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_FAILED)
671 action->state = SIMIX_DST_HOST_FAILURE;
672 else if (action->comm.surf_comm &&
673 surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED)
674 action->state = SIMIX_LINK_FAILURE;
676 action->state = SIMIX_DONE;
678 XBT_DEBUG("SIMIX_post_comm: comm %p, state %d, src_proc %p, dst_proc %p, detached: %d",
679 action, action->state, action->comm.src_proc, action->comm.dst_proc, action->comm.detached);
681 /* remove the action from pending communications of both processes (if they still exist) */
682 if (action->comm.src_proc) {
683 xbt_fifo_remove(action->comm.src_proc->comms, action);
685 if (action->comm.dst_proc) {
686 xbt_fifo_remove(action->comm.dst_proc->comms, action);
689 /* destroy the surf actions associated with the Simix communication */
690 SIMIX_comm_destroy_internal_actions(action);
692 /* if there are requests associated with the action, then answer them */
693 if (xbt_fifo_size(action->request_list))
694 SIMIX_comm_finish(action);
697 void SIMIX_comm_cancel(smx_action_t action)
699 /* If the action is a waiting state means that it is still in a rdv */
700 /* so remove from it and delete it */
701 if (action->state == SIMIX_WAITING) {
702 SIMIX_rdv_remove(action->comm.rdv, action);
703 action->state = SIMIX_FAILED;
705 /* When running the MC there are no surf actions */
707 surf_workstation_model->action_cancel(action->comm.surf_comm);
711 void SIMIX_comm_suspend(smx_action_t action)
713 /*FIXME: shall we suspend also the timeout actions? */
714 surf_workstation_model->suspend(action->comm.surf_comm);
717 void SIMIX_comm_resume(smx_action_t action)
719 /*FIXME: check what happen with the timeouts */
720 surf_workstation_model->resume(action->comm.surf_comm);
724 /************* Action Getters **************/
727 * \brief get the amount remaining from the communication
728 * \param action The communication
730 double SIMIX_comm_get_remains(smx_action_t action)
738 switch (action->state) {
741 remains = surf_workstation_model->get_remains(action->comm.surf_comm);
746 remains = 0; /*FIXME: check what should be returned */
750 remains = 0; /*FIXME: is this correct? */
756 e_smx_state_t SIMIX_comm_get_state(smx_action_t action)
758 return action->state;
762 * \brief Return the user data associated to the sender of the communication
763 * \param action The communication
764 * \return the user data
766 void* SIMIX_comm_get_src_data(smx_action_t action)
768 return action->comm.src_data;
772 * \brief Return the user data associated to the receiver of the communication
773 * \param action The communication
774 * \return the user data
776 void* SIMIX_comm_get_dst_data(smx_action_t action)
778 return action->comm.dst_data;
781 smx_process_t SIMIX_comm_get_src_proc(smx_action_t action)
783 return action->comm.src_proc;
786 smx_process_t SIMIX_comm_get_dst_proc(smx_action_t action)
788 return action->comm.dst_proc;
791 #ifdef HAVE_LATENCY_BOUND_TRACKING
793 * \brief verify if communication is latency bounded
794 * \param comm The communication
796 XBT_INLINE int SIMIX_comm_is_latency_bounded(smx_action_t action)
801 if (action->comm.surf_comm){
802 XBT_DEBUG("Getting latency limited for surf_action (%p)", action->comm.surf_comm);
803 action->latency_limited = surf_workstation_model->get_latency_limited(action->comm.surf_comm);
804 XBT_DEBUG("Action limited is %d", action->latency_limited);
806 return action->latency_limited;
810 /******************************************************************************/
811 /* SIMIX_comm_copy_data callbacks */
812 /******************************************************************************/
813 static void (*SIMIX_comm_copy_data_callback) (smx_action_t, size_t) =
814 &SIMIX_comm_copy_pointer_callback;
817 SIMIX_comm_set_copy_data_callback(void (*callback) (smx_action_t, size_t))
819 SIMIX_comm_copy_data_callback = callback;
822 void SIMIX_comm_copy_pointer_callback(smx_action_t comm, size_t buff_size)
824 xbt_assert((buff_size == sizeof(void *)),
825 "Cannot copy %zu bytes: must be sizeof(void*)", buff_size);
826 *(void **) (comm->comm.dst_buff) = comm->comm.src_buff;
829 void SIMIX_comm_copy_buffer_callback(smx_action_t comm, size_t buff_size)
831 memcpy(comm->comm.dst_buff, comm->comm.src_buff, buff_size);
835 * \brief Copy the communication data from the sender's buffer to the receiver's one
836 * \param comm The communication
838 void SIMIX_comm_copy_data(smx_action_t comm)
840 size_t buff_size = comm->comm.src_buff_size;
841 /* If there is no data to be copy then return */
842 if (!comm->comm.src_buff || !comm->comm.dst_buff || comm->comm.copied == 1)
845 XBT_DEBUG("Copying comm %p data from %s (%p) -> %s (%p) (%zu bytes)",
847 comm->comm.src_proc->smx_host->name, comm->comm.src_buff,
848 comm->comm.dst_proc->smx_host->name, comm->comm.dst_buff, buff_size);
850 /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
851 if (comm->comm.dst_buff_size)
852 buff_size = MIN(buff_size, *(comm->comm.dst_buff_size));
854 /* Update the receiver's buffer size to the copied amount */
855 if (comm->comm.dst_buff_size)
856 *comm->comm.dst_buff_size = buff_size;
861 (*SIMIX_comm_copy_data_callback) (comm, buff_size);
863 /* Set the copied flag so we copy data only once */
864 /* (this function might be called from both communication ends) */
865 comm->comm.copied = 1;