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;
68 xbt_fifo_free(rdv->comm_fifo);
72 smx_rdv_t SIMIX_rdv_get_by_name(const char *name)
74 return xbt_dict_get_or_null(rdv_points, name);
77 int SIMIX_rdv_comm_count_by_host(smx_rdv_t rdv, smx_host_t host)
79 smx_action_t comm = NULL;
80 xbt_fifo_item_t item = NULL;
83 xbt_fifo_foreach(rdv->comm_fifo, item, comm, smx_action_t) {
84 if (comm->comm.src_proc->smx_host == host)
91 smx_action_t SIMIX_rdv_get_head(smx_rdv_t rdv)
93 return xbt_fifo_get_item_content(xbt_fifo_get_first_item(rdv->comm_fifo));
97 * \brief Push a communication request into a rendez-vous point
98 * \param rdv The rendez-vous point
99 * \param comm The communication request
101 static XBT_INLINE void SIMIX_rdv_push(smx_rdv_t rdv, smx_action_t comm)
103 xbt_fifo_push(rdv->comm_fifo, comm);
104 comm->comm.rdv = rdv;
108 * \brief Remove a communication request from a rendez-vous point
109 * \param rdv The rendez-vous point
110 * \param comm The communication request
112 static XBT_INLINE void SIMIX_rdv_remove(smx_rdv_t rdv, smx_action_t comm)
114 xbt_fifo_remove(rdv->comm_fifo, comm);
115 comm->comm.rdv = NULL;
119 * \brief Wrapper to SIMIX_rdv_get_request
121 smx_action_t SIMIX_comm_get_send_match(smx_rdv_t rdv, int (*match_fun)(void*, void*), void* data) {
122 return SIMIX_rdv_get_request(rdv, SIMIX_COMM_SEND, match_fun, data);
126 * \brief Checks if there is a communication action queued in a rendez-vous matching our needs
127 * \param type The type of communication we are looking for (comm_send, comm_recv)
128 * \return The communication action if found, NULL otherwise
130 smx_action_t SIMIX_rdv_get_request(smx_rdv_t rdv, e_smx_comm_type_t type,
131 int (*match_fun)(void *, void *), void *data)
133 // FIXME rewrite this function by using SIMIX_rdv_has_send/recv_match
135 xbt_fifo_item_t item;
136 void* req_data = NULL;
138 xbt_fifo_foreach(rdv->comm_fifo, item, action, smx_action_t){
139 if (action->comm.type == SIMIX_COMM_SEND) {
140 req_data = action->comm.src_data;
141 } else if (action->comm.type == SIMIX_COMM_RECEIVE) {
142 req_data = action->comm.dst_data;
144 if (action->comm.type == type && (!match_fun || match_fun(data, req_data))) {
145 XBT_DEBUG("Found a matching communication action %p", action);
146 xbt_fifo_remove_item(rdv->comm_fifo, item);
147 xbt_fifo_free_item(item);
148 action->comm.refcount++;
149 action->comm.rdv = NULL;
152 XBT_DEBUG("Sorry, communication action %p does not match our needs:"
153 " its type is %d but we are looking for a comm of type %d",
154 action, action->comm.type, type);
156 XBT_DEBUG("No matching communication action found");
161 * \brief Checks if there is a send communication action
162 * queued in a rendez-vous matching our needs.
163 * \return 1 if found, 0 otherwise
165 int SIMIX_comm_has_send_match(smx_rdv_t rdv, int (*match_fun)(void*, void*), void* data) {
168 xbt_fifo_item_t item;
170 xbt_fifo_foreach(rdv->comm_fifo, item, action, smx_action_t){
171 if (action->comm.type == SIMIX_COMM_SEND
172 && (!match_fun || match_fun(data, action->comm.src_data))) {
173 XBT_DEBUG("Found a matching communication action %p", action);
177 XBT_DEBUG("No matching communication action found");
182 * \brief Checks if there is a recv communication action
183 * queued in a rendez-vous matching our needs.
184 * \return 1 if found, 0 otherwise
186 int SIMIX_comm_has_recv_match(smx_rdv_t rdv, int (*match_fun)(void*, void*), void* data) {
189 xbt_fifo_item_t item;
191 xbt_fifo_foreach(rdv->comm_fifo, item, action, smx_action_t){
192 if (action->comm.type == SIMIX_COMM_RECEIVE
193 && (!match_fun || match_fun(data, action->comm.dst_data))) {
194 XBT_DEBUG("Found a matching communication action %p", action);
198 XBT_DEBUG("No matching communication action found");
202 /******************************************************************************/
203 /* Comunication Actions */
204 /******************************************************************************/
207 * \brief Creates a new comunicate action
208 * \param type The type of request (comm_send, comm_recv)
209 * \return The new comunicate action
211 smx_action_t SIMIX_comm_new(e_smx_comm_type_t type)
215 /* alloc structures */
216 act = xbt_mallocator_get(simix_global->action_mallocator);
217 act->type = SIMIX_ACTION_COMMUNICATE;
218 act->state = SIMIX_WAITING;
220 /* set communication */
221 act->comm.type = type;
222 act->comm.refcount = 1;
224 #ifdef HAVE_LATENCY_BOUND_TRACKING
225 //initialize with unknown value
226 act->latency_limited = -1;
230 act->category = NULL;
233 XBT_DEBUG("Create communicate action %p", act);
240 * \brief Destroy a communicate action
241 * \param action The communicate action to be destroyed
243 void SIMIX_comm_destroy(smx_action_t action)
245 XBT_DEBUG("Destroy action %p (refcount:%d)", action, action->comm.refcount);
247 if (action->comm.refcount <= 0)
248 xbt_die("the refcount of comm %p is already 0 before decreasing it. "
249 "That's a bug!", action);
251 action->comm.refcount--;
252 if (action->comm.refcount > 0)
254 XBT_DEBUG("Really free communication %p; refcount is now %d", action,
255 action->comm.refcount);
257 #ifdef HAVE_LATENCY_BOUND_TRACKING
258 action->latency_limited = SIMIX_comm_is_latency_bounded( action ) ;
262 TRACE_smx_action_destroy(action);
265 xbt_free(action->name);
266 SIMIX_comm_destroy_internal_actions(action);
268 if (action->comm.detached && action->state != SIMIX_DONE) {
269 /* the communication has failed and was detached:
270 * we have to free the buffer */
271 ((void_f_pvoid_t) action->comm.src_data)(action->comm.src_buff);
274 xbt_mallocator_release(simix_global->action_mallocator, action);
277 void SIMIX_comm_destroy_internal_actions(smx_action_t action)
279 if (action->comm.surf_comm){
280 #ifdef HAVE_LATENCY_BOUND_TRACKING
281 action->latency_limited = SIMIX_comm_is_latency_bounded(action);
283 action->comm.surf_comm->model_type->action_unref(action->comm.surf_comm);
284 action->comm.surf_comm = NULL;
287 if (action->comm.src_timeout){
288 action->comm.src_timeout->model_type->action_unref(action->comm.src_timeout);
289 action->comm.src_timeout = NULL;
292 if (action->comm.dst_timeout){
293 action->comm.dst_timeout->model_type->action_unref(action->comm.dst_timeout);
294 action->comm.dst_timeout = NULL;
298 smx_action_t SIMIX_comm_isend(smx_process_t src_proc, smx_rdv_t rdv,
299 double task_size, double rate,
300 void *src_buff, size_t src_buff_size,
301 int (*match_fun)(void *, void *), void *data,
306 /* Look for communication request matching our needs.
307 If it is not found then create it and push it into the rendez-vous point */
308 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_RECEIVE, match_fun, data);
311 action = SIMIX_comm_new(SIMIX_COMM_SEND);
312 SIMIX_rdv_push(rdv, action);
314 action->state = SIMIX_READY;
315 action->comm.type = SIMIX_COMM_READY;
318 /* If the communication action is detached then decrease the refcount
319 * by one, so it will be eliminated by the receivers destroy call */
321 action->comm.detached = 1;
322 action->comm.refcount--;
325 /* Setup the communication request */
326 action->comm.src_proc = src_proc;
327 action->comm.task_size = task_size;
328 action->comm.rate = rate;
329 action->comm.src_buff = src_buff;
330 action->comm.src_buff_size = src_buff_size;
331 action->comm.src_data = data;
334 action->state = SIMIX_RUNNING;
338 SIMIX_comm_start(action);
342 smx_action_t SIMIX_comm_irecv(smx_process_t dst_proc, smx_rdv_t rdv,
343 void *dst_buff, size_t *dst_buff_size,
344 int (*match_fun)(void *, void *), void *data)
348 /* Look for communication request matching our needs.
349 * If it is not found then create it and push it into the rendez-vous point
351 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_SEND, match_fun, data);
354 action = SIMIX_comm_new(SIMIX_COMM_RECEIVE);
355 SIMIX_rdv_push(rdv, action);
357 action->state = SIMIX_READY;
358 action->comm.type = SIMIX_COMM_READY;
361 /* Setup communication request */
362 action->comm.dst_proc = dst_proc;
363 action->comm.dst_buff = dst_buff;
364 action->comm.dst_buff_size = dst_buff_size;
365 action->comm.dst_data = data;
368 action->state = SIMIX_RUNNING;
372 SIMIX_comm_start(action);
376 void SIMIX_pre_comm_wait(smx_req_t req, smx_action_t action, double timeout, int idx)
378 /* the request may be a wait, a send or a recv */
381 /* Associate this request to the action */
382 xbt_fifo_push(action->request_list, req);
383 req->issuer->waiting_action = action;
387 action->state = SIMIX_DONE;
389 /* If we reached this point, the wait request must have a timeout */
390 /* Otherwise it shouldn't be enabled and executed by the MC */
394 if (action->comm.src_proc == req->issuer)
395 action->state = SIMIX_SRC_TIMEOUT;
397 action->state = SIMIX_DST_TIMEOUT;
400 SIMIX_comm_finish(action);
404 /* If the action has already finish perform the error handling, */
405 /* otherwise set up a waiting timeout on the right side */
406 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
407 SIMIX_comm_finish(action);
408 } 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 */
409 sleep = surf_workstation_model->extension.workstation.sleep(req->issuer->smx_host->host, timeout);
410 surf_workstation_model->action_data_set(sleep, action);
412 if (req->issuer == action->comm.src_proc)
413 action->comm.src_timeout = sleep;
415 action->comm.dst_timeout = sleep;
419 void SIMIX_pre_comm_test(smx_req_t req)
421 smx_action_t action = req->comm_test.comm;
424 req->comm_test.result = action->comm.src_proc && action->comm.dst_proc;
425 if(req->comm_test.result){
426 action->state = SIMIX_DONE;
427 xbt_fifo_push(action->request_list, req);
428 SIMIX_comm_finish(action);
430 SIMIX_request_answer(req);
435 req->comm_test.result = (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING);
436 if (req->comm_test.result) {
437 xbt_fifo_push(action->request_list, req);
438 SIMIX_comm_finish(action);
440 SIMIX_request_answer(req);
444 void SIMIX_pre_comm_testany(smx_req_t req, int idx)
448 xbt_dynar_t actions = req->comm_testany.comms;
449 req->comm_testany.result = -1;
453 SIMIX_request_answer(req);
455 action = xbt_dynar_get_as(actions, idx, smx_action_t);
456 req->comm_testany.result = idx;
457 xbt_fifo_push(action->request_list, req);
458 action->state = SIMIX_DONE;
459 SIMIX_comm_finish(action);
464 xbt_dynar_foreach(req->comm_testany.comms,cursor,action) {
465 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
466 req->comm_testany.result = cursor;
467 xbt_fifo_push(action->request_list, req);
468 SIMIX_comm_finish(action);
472 SIMIX_request_answer(req);
475 void SIMIX_pre_comm_waitany(smx_req_t req, int idx)
478 unsigned int cursor = 0;
479 xbt_dynar_t actions = req->comm_waitany.comms;
482 action = xbt_dynar_get_as(actions, idx, smx_action_t);
483 xbt_fifo_push(action->request_list, req);
484 req->comm_waitany.result = idx;
485 action->state = SIMIX_DONE;
486 SIMIX_comm_finish(action);
490 xbt_dynar_foreach(actions, cursor, action){
491 /* Associate this request to the action */
492 xbt_fifo_push(action->request_list, req);
493 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING){
494 SIMIX_comm_finish(action);
500 void SIMIX_waitany_req_remove_from_actions(smx_req_t req)
503 unsigned int cursor = 0;
504 xbt_dynar_t actions = req->comm_waitany.comms;
506 xbt_dynar_foreach(actions, cursor, action){
507 xbt_fifo_remove(action->request_list, req);
512 * \brief Start the simulation of a communication request
513 * \param action The communication action
516 XBT_INLINE void SIMIX_comm_start(smx_action_t action)
518 /* If both the sender and the receiver are already there, start the communication */
519 if (action->state == SIMIX_READY) {
520 smx_host_t sender = action->comm.src_proc->smx_host;
521 smx_host_t receiver = action->comm.dst_proc->smx_host;
523 XBT_DEBUG("Starting communication %p from '%s' to '%s'", action,
524 SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
526 action->comm.surf_comm = surf_workstation_model->extension.workstation.
527 communicate(sender->host, receiver->host, action->comm.task_size, action->comm.rate);
529 surf_workstation_model->action_data_set(action->comm.surf_comm, action);
531 action->state = SIMIX_RUNNING;
534 TRACE_smx_action_communicate(action, action->comm.src_proc);
537 /* If a link is failed, detect it immediately */
538 if (surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED) {
539 XBT_DEBUG("Communication from '%s' to '%s' failed to start because of a link failure",
540 SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
541 action->state = SIMIX_LINK_FAILURE;
542 SIMIX_comm_destroy_internal_actions(action);
545 /* If any of the process is suspend, create the action but stop its execution,
546 it will be restarted when the sender process resume */
547 if (SIMIX_process_is_suspended(action->comm.src_proc) ||
548 SIMIX_process_is_suspended(action->comm.dst_proc)) {
549 /* FIXME: check what should happen with the action state */
550 surf_workstation_model->suspend(action->comm.surf_comm);
555 void SIMIX_comm_finish(smx_action_t action)
557 unsigned int destroy_count = 0;
560 while ((req = xbt_fifo_shift(action->request_list))) {
562 /* If a waitany request is waiting for this action to finish, then remove
563 it from the other actions in the waitany list. Afterwards, get the
564 position of the actual action in the waitany request's actions dynar and
565 return it as the result of the call */
566 if (req->call == REQ_COMM_WAITANY) {
567 SIMIX_waitany_req_remove_from_actions(req);
569 req->comm_waitany.result = xbt_dynar_search(req->comm_waitany.comms, &action);
572 /* If the action is still in a rendez-vous point then remove from it */
573 if (action->comm.rdv)
574 SIMIX_rdv_remove(action->comm.rdv, action);
576 XBT_DEBUG("SIMIX_comm_finish: action state = %d", action->state);
578 /* Check out for errors */
579 switch (action->state) {
582 XBT_DEBUG("Communication %p complete!", action);
583 SIMIX_comm_copy_data(action);
586 case SIMIX_SRC_TIMEOUT:
588 THROWF(timeout_error, 0, "Communication timeouted because of sender");
590 CATCH(req->issuer->running_ctx->exception) {
591 req->issuer->doexception = 1;
595 case SIMIX_DST_TIMEOUT:
597 THROWF(timeout_error, 0, "Communication timeouted because of receiver");
599 CATCH(req->issuer->running_ctx->exception) {
600 req->issuer->doexception = 1;
604 case SIMIX_SRC_HOST_FAILURE:
606 if (req->issuer == action->comm.src_proc)
607 THROWF(host_error, 0, "Host failed");
609 THROWF(network_error, 0, "Remote peer failed");
611 CATCH(req->issuer->running_ctx->exception) {
612 req->issuer->doexception = 1;
616 case SIMIX_DST_HOST_FAILURE:
618 if (req->issuer == action->comm.dst_proc)
619 THROWF(host_error, 0, "Host failed");
621 THROWF(network_error, 0, "Remote peer failed");
623 CATCH(req->issuer->running_ctx->exception) {
624 req->issuer->doexception = 1;
628 case SIMIX_LINK_FAILURE:
630 XBT_DEBUG("Link failure in action %p between '%s' and '%s': posting an exception to the issuer: %s (%p)",
631 action, action->comm.src_proc->smx_host->name, action->comm.dst_proc->smx_host->name,
632 req->issuer->name, req->issuer);
633 THROWF(network_error, 0, "Link failure");
635 CATCH(req->issuer->running_ctx->exception) {
636 req->issuer->doexception = 1;
644 /* if there is an exception during a waitany or a testany, indicate the position of the failed communication */
645 if (req->issuer->doexception) {
646 if (req->call == REQ_COMM_WAITANY) {
647 req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_waitany.comms, &action);
649 else if (req->call == REQ_COMM_TESTANY) {
650 req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_testany.comms, &action);
654 req->issuer->waiting_action = NULL;
655 SIMIX_request_answer(req);
659 while (destroy_count-- > 0)
660 SIMIX_comm_destroy(action);
663 void SIMIX_post_comm(smx_action_t action)
665 /* Update action state */
666 if (action->comm.src_timeout &&
667 surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_DONE)
668 action->state = SIMIX_SRC_TIMEOUT;
669 else if (action->comm.dst_timeout &&
670 surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_DONE)
671 action->state = SIMIX_DST_TIMEOUT;
672 else if (action->comm.src_timeout &&
673 surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_FAILED)
674 action->state = SIMIX_SRC_HOST_FAILURE;
675 else if (action->comm.dst_timeout &&
676 surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_FAILED)
677 action->state = SIMIX_DST_HOST_FAILURE;
678 else if (action->comm.surf_comm &&
679 surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED)
680 action->state = SIMIX_LINK_FAILURE;
682 action->state = SIMIX_DONE;
684 XBT_DEBUG("SIMIX_post_comm: action state = %d", action->state);
686 /* After this point the surf actions associated with the simix communicate
687 action are no longer needed, thus we delete them. */
688 SIMIX_comm_destroy_internal_actions(action);
690 /* If there are requests associated with the action, then answer them */
691 if (xbt_fifo_size(action->request_list))
692 SIMIX_comm_finish(action);
695 void SIMIX_comm_cancel(smx_action_t action)
697 /* If the action is a waiting state means that it is still in a rdv */
698 /* so remove from it and delete it */
699 if (action->state == SIMIX_WAITING) {
700 SIMIX_rdv_remove(action->comm.rdv, action);
701 action->state = SIMIX_FAILED;
703 /* When running the MC there are no surf actions */
705 surf_workstation_model->action_cancel(action->comm.surf_comm);
709 void SIMIX_comm_suspend(smx_action_t action)
711 /*FIXME: shall we suspend also the timeout actions? */
712 surf_workstation_model->suspend(action->comm.surf_comm);
715 void SIMIX_comm_resume(smx_action_t action)
717 /*FIXME: check what happen with the timeouts */
718 surf_workstation_model->resume(action->comm.surf_comm);
722 /************* Action Getters **************/
725 * \brief get the amount remaining from the communication
726 * \param action The communication
728 double SIMIX_comm_get_remains(smx_action_t action)
732 switch (action->state) {
735 remains = surf_workstation_model->get_remains(action->comm.surf_comm);
740 remains = 0; /*FIXME: check what should be returned */
744 remains = 0; /*FIXME: is this correct? */
750 e_smx_state_t SIMIX_comm_get_state(smx_action_t action)
752 return action->state;
756 * \brief Return the user data associated to the sender of the communication
757 * \param action The communication
758 * \return the user data
760 void* SIMIX_comm_get_src_data(smx_action_t action)
762 return action->comm.src_data;
766 * \brief Return the user data associated to the receiver of the communication
767 * \param action The communication
768 * \return the user data
770 void* SIMIX_comm_get_dst_data(smx_action_t action)
772 return action->comm.dst_data;
775 smx_process_t SIMIX_comm_get_src_proc(smx_action_t action)
777 return action->comm.src_proc;
780 smx_process_t SIMIX_comm_get_dst_proc(smx_action_t action)
782 return action->comm.dst_proc;
785 #ifdef HAVE_LATENCY_BOUND_TRACKING
787 * \brief verify if communication is latency bounded
788 * \param comm The communication
790 XBT_INLINE int SIMIX_comm_is_latency_bounded(smx_action_t action)
792 if (action->comm.surf_comm){
793 XBT_DEBUG("Getting latency limited for surf_action (%p)", action->comm.surf_comm);
794 action->latency_limited = surf_workstation_model->get_latency_limited(action->comm.surf_comm);
795 XBT_DEBUG("Action limited is %d", action->latency_limited);
797 return action->latency_limited;
801 /******************************************************************************/
802 /* SIMIX_comm_copy_data callbacks */
803 /******************************************************************************/
804 static void (*SIMIX_comm_copy_data_callback) (smx_action_t, size_t) =
805 &SIMIX_comm_copy_pointer_callback;
808 SIMIX_comm_set_copy_data_callback(void (*callback) (smx_action_t, size_t))
810 SIMIX_comm_copy_data_callback = callback;
813 void SIMIX_comm_copy_pointer_callback(smx_action_t comm, size_t buff_size)
815 xbt_assert((buff_size == sizeof(void *)),
816 "Cannot copy %zu bytes: must be sizeof(void*)", buff_size);
817 *(void **) (comm->comm.dst_buff) = comm->comm.src_buff;
820 void SIMIX_comm_copy_buffer_callback(smx_action_t comm, size_t buff_size)
822 memcpy(comm->comm.dst_buff, comm->comm.src_buff, buff_size);
826 * \brief Copy the communication data from the sender's buffer to the receiver's one
827 * \param comm The communication
829 void SIMIX_comm_copy_data(smx_action_t comm)
831 size_t buff_size = comm->comm.src_buff_size;
832 /* If there is no data to be copy then return */
833 if (!comm->comm.src_buff || !comm->comm.dst_buff || comm->comm.copied == 1)
836 XBT_DEBUG("Copying comm %p data from %s (%p) -> %s (%p) (%zu bytes)",
838 comm->comm.src_proc->smx_host->name, comm->comm.src_buff,
839 comm->comm.dst_proc->smx_host->name, comm->comm.dst_buff, buff_size);
841 /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
842 if (comm->comm.dst_buff_size)
843 buff_size = MIN(buff_size, *(comm->comm.dst_buff_size));
845 /* Update the receiver's buffer size to the copied amount */
846 if (comm->comm.dst_buff_size)
847 *comm->comm.dst_buff_size = buff_size;
852 (*SIMIX_comm_copy_data_callback) (comm, buff_size);
854 /* Set the copied flag so we copy data only once */
855 /* (this function might be called from both communication ends) */
856 comm->comm.copied = 1;