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 ) ;
261 xbt_free(action->name);
262 SIMIX_comm_destroy_internal_actions(action);
264 if (action->comm.detached && action->state != SIMIX_DONE) {
265 /* the communication has failed and was detached:
266 * we have to free the buffer */
267 ((void_f_pvoid_t) action->comm.src_data)(action->comm.src_buff);
270 xbt_mallocator_release(simix_global->action_mallocator, action);
273 void SIMIX_comm_destroy_internal_actions(smx_action_t action)
275 if (action->comm.surf_comm){
276 #ifdef HAVE_LATENCY_BOUND_TRACKING
277 action->latency_limited = SIMIX_comm_is_latency_bounded(action);
279 action->comm.surf_comm->model_type->action_unref(action->comm.surf_comm);
280 action->comm.surf_comm = NULL;
283 if (action->comm.src_timeout){
284 action->comm.src_timeout->model_type->action_unref(action->comm.src_timeout);
285 action->comm.src_timeout = NULL;
288 if (action->comm.dst_timeout){
289 action->comm.dst_timeout->model_type->action_unref(action->comm.dst_timeout);
290 action->comm.dst_timeout = NULL;
294 smx_action_t SIMIX_comm_isend(smx_process_t src_proc, smx_rdv_t rdv,
295 double task_size, double rate,
296 void *src_buff, size_t src_buff_size,
297 int (*match_fun)(void *, void *), void *data,
302 /* Look for communication request matching our needs.
303 If it is not found then create it and push it into the rendez-vous point */
304 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_RECEIVE, match_fun, data);
307 action = SIMIX_comm_new(SIMIX_COMM_SEND);
308 SIMIX_rdv_push(rdv, action);
310 action->state = SIMIX_READY;
311 action->comm.type = SIMIX_COMM_READY;
314 /* If the communication action is detached then decrease the refcount
315 * by one, so it will be eliminated by the receivers 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;
357 /* Setup communication request */
358 action->comm.dst_proc = dst_proc;
359 action->comm.dst_buff = dst_buff;
360 action->comm.dst_buff_size = dst_buff_size;
361 action->comm.dst_data = data;
364 action->state = SIMIX_RUNNING;
368 SIMIX_comm_start(action);
372 void SIMIX_pre_comm_wait(smx_req_t req, smx_action_t action, double timeout, int idx)
374 /* the request may be a wait, a send or a recv */
377 /* Associate this request to the action */
378 xbt_fifo_push(action->request_list, req);
379 req->issuer->waiting_action = action;
383 action->state = SIMIX_DONE;
385 /* If we reached this point, the wait request must have a timeout */
386 /* Otherwise it shouldn't be enabled and executed by the MC */
390 if (action->comm.src_proc == req->issuer)
391 action->state = SIMIX_SRC_TIMEOUT;
393 action->state = SIMIX_DST_TIMEOUT;
396 SIMIX_comm_finish(action);
400 /* If the action has already finish perform the error handling, */
401 /* otherwise set up a waiting timeout on the right side */
402 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
403 SIMIX_comm_finish(action);
404 } 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 */
405 sleep = surf_workstation_model->extension.workstation.sleep(req->issuer->smx_host->host, timeout);
406 surf_workstation_model->action_data_set(sleep, action);
408 if (req->issuer == action->comm.src_proc)
409 action->comm.src_timeout = sleep;
411 action->comm.dst_timeout = sleep;
415 void SIMIX_pre_comm_test(smx_req_t req)
417 smx_action_t action = req->comm_test.comm;
420 req->comm_test.result = action->comm.src_proc && action->comm.dst_proc;
421 if(req->comm_test.result){
422 action->state = SIMIX_DONE;
423 xbt_fifo_push(action->request_list, req);
424 SIMIX_comm_finish(action);
426 SIMIX_request_answer(req);
431 req->comm_test.result = (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING);
432 if (req->comm_test.result) {
433 xbt_fifo_push(action->request_list, req);
434 SIMIX_comm_finish(action);
436 SIMIX_request_answer(req);
440 void SIMIX_pre_comm_testany(smx_req_t req, int idx)
444 xbt_dynar_t actions = req->comm_testany.comms;
445 req->comm_testany.result = -1;
449 SIMIX_request_answer(req);
451 action = xbt_dynar_get_as(actions, idx, smx_action_t);
452 req->comm_testany.result = idx;
453 xbt_fifo_push(action->request_list, req);
454 action->state = SIMIX_DONE;
455 SIMIX_comm_finish(action);
460 xbt_dynar_foreach(req->comm_testany.comms,cursor,action) {
461 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
462 req->comm_testany.result = cursor;
463 xbt_fifo_push(action->request_list, req);
464 SIMIX_comm_finish(action);
468 SIMIX_request_answer(req);
471 void SIMIX_pre_comm_waitany(smx_req_t req, int idx)
474 unsigned int cursor = 0;
475 xbt_dynar_t actions = req->comm_waitany.comms;
478 action = xbt_dynar_get_as(actions, idx, smx_action_t);
479 xbt_fifo_push(action->request_list, req);
480 req->comm_waitany.result = idx;
481 action->state = SIMIX_DONE;
482 SIMIX_comm_finish(action);
486 xbt_dynar_foreach(actions, cursor, action){
487 /* Associate this request to the action */
488 xbt_fifo_push(action->request_list, req);
489 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING){
490 SIMIX_comm_finish(action);
496 void SIMIX_waitany_req_remove_from_actions(smx_req_t req)
499 unsigned int cursor = 0;
500 xbt_dynar_t actions = req->comm_waitany.comms;
502 xbt_dynar_foreach(actions, cursor, action){
503 xbt_fifo_remove(action->request_list, req);
508 * \brief Start the simulation of a communication request
509 * \param action The communication action
512 XBT_INLINE void SIMIX_comm_start(smx_action_t action)
514 /* If both the sender and the receiver are already there, start the communication */
515 if (action->state == SIMIX_READY) {
516 smx_host_t sender = action->comm.src_proc->smx_host;
517 smx_host_t receiver = action->comm.dst_proc->smx_host;
519 XBT_DEBUG("Starting communication %p from '%s' to '%s'", action,
520 SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
522 action->comm.surf_comm = surf_workstation_model->extension.workstation.
523 communicate(sender->host, receiver->host, action->comm.task_size, action->comm.rate);
525 surf_workstation_model->action_data_set(action->comm.surf_comm, action);
527 action->state = SIMIX_RUNNING;
529 /* If a link is failed, detect it immediately */
530 if (surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED) {
531 XBT_DEBUG("Communication from '%s' to '%s' failed to start because of a link failure",
532 SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
533 action->state = SIMIX_LINK_FAILURE;
534 SIMIX_comm_destroy_internal_actions(action);
537 /* If any of the process is suspend, create the action but stop its execution,
538 it will be restarted when the sender process resume */
539 if (SIMIX_process_is_suspended(action->comm.src_proc) ||
540 SIMIX_process_is_suspended(action->comm.dst_proc)) {
541 /* FIXME: check what should happen with the action state */
542 surf_workstation_model->suspend(action->comm.surf_comm);
547 void SIMIX_comm_finish(smx_action_t action)
549 unsigned int destroy_count = 0;
552 while ((req = xbt_fifo_shift(action->request_list))) {
554 /* If a waitany request is waiting for this action to finish, then remove
555 it from the other actions in the waitany list. Afterwards, get the
556 position of the actual action in the waitany request's actions dynar and
557 return it as the result of the call */
558 if (req->call == REQ_COMM_WAITANY) {
559 SIMIX_waitany_req_remove_from_actions(req);
561 req->comm_waitany.result = xbt_dynar_search(req->comm_waitany.comms, &action);
564 /* If the action is still in a rendez-vous point then remove from it */
565 if (action->comm.rdv)
566 SIMIX_rdv_remove(action->comm.rdv, action);
568 XBT_DEBUG("SIMIX_comm_finish: action state = %d", action->state);
570 /* Check out for errors */
571 switch (action->state) {
574 XBT_DEBUG("Communication %p complete!", action);
575 SIMIX_comm_copy_data(action);
578 case SIMIX_SRC_TIMEOUT:
580 THROWF(timeout_error, 0, "Communication timeouted because of sender");
582 CATCH(req->issuer->running_ctx->exception) {
583 req->issuer->doexception = 1;
587 case SIMIX_DST_TIMEOUT:
589 THROWF(timeout_error, 0, "Communication timeouted because of receiver");
591 CATCH(req->issuer->running_ctx->exception) {
592 req->issuer->doexception = 1;
596 case SIMIX_SRC_HOST_FAILURE:
598 if (req->issuer == action->comm.src_proc)
599 THROWF(host_error, 0, "Host failed");
601 THROWF(network_error, 0, "Remote peer failed");
603 CATCH(req->issuer->running_ctx->exception) {
604 req->issuer->doexception = 1;
608 case SIMIX_DST_HOST_FAILURE:
610 if (req->issuer == action->comm.dst_proc)
611 THROWF(host_error, 0, "Host failed");
613 THROWF(network_error, 0, "Remote peer failed");
615 CATCH(req->issuer->running_ctx->exception) {
616 req->issuer->doexception = 1;
620 case SIMIX_LINK_FAILURE:
622 XBT_DEBUG("Link failure in action %p between '%s' and '%s': posting an exception to the issuer: %s (%p)",
623 action, action->comm.src_proc->smx_host->name, action->comm.dst_proc->smx_host->name,
624 req->issuer->name, req->issuer);
625 THROWF(network_error, 0, "Link failure");
627 CATCH(req->issuer->running_ctx->exception) {
628 req->issuer->doexception = 1;
636 /* if there is an exception during a waitany or a testany, indicate the position of the failed communication */
637 if (req->issuer->doexception) {
638 if (req->call == REQ_COMM_WAITANY) {
639 req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_waitany.comms, &action);
641 else if (req->call == REQ_COMM_TESTANY) {
642 req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_testany.comms, &action);
646 req->issuer->waiting_action = NULL;
647 SIMIX_request_answer(req);
651 while (destroy_count-- > 0)
652 SIMIX_comm_destroy(action);
655 void SIMIX_post_comm(smx_action_t action)
657 /* Update action state */
658 if (action->comm.src_timeout &&
659 surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_DONE)
660 action->state = SIMIX_SRC_TIMEOUT;
661 else if (action->comm.dst_timeout &&
662 surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_DONE)
663 action->state = SIMIX_DST_TIMEOUT;
664 else if (action->comm.src_timeout &&
665 surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_FAILED)
666 action->state = SIMIX_SRC_HOST_FAILURE;
667 else if (action->comm.dst_timeout &&
668 surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_FAILED)
669 action->state = SIMIX_DST_HOST_FAILURE;
670 else if (action->comm.surf_comm &&
671 surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED)
672 action->state = SIMIX_LINK_FAILURE;
674 action->state = SIMIX_DONE;
676 XBT_DEBUG("SIMIX_post_comm: action state = %d", action->state);
678 /* After this point the surf actions associated with the simix communicate
679 action are no longer needed, thus we delete them. */
680 SIMIX_comm_destroy_internal_actions(action);
682 /* If there are requests associated with the action, then answer them */
683 if (xbt_fifo_size(action->request_list))
684 SIMIX_comm_finish(action);
687 void SIMIX_comm_cancel(smx_action_t action)
689 /* If the action is a waiting state means that it is still in a rdv */
690 /* so remove from it and delete it */
691 if (action->state == SIMIX_WAITING) {
692 SIMIX_rdv_remove(action->comm.rdv, action);
693 action->state = SIMIX_FAILED;
695 /* When running the MC there are no surf actions */
697 surf_workstation_model->action_cancel(action->comm.surf_comm);
701 void SIMIX_comm_suspend(smx_action_t action)
703 /*FIXME: shall we suspend also the timeout actions? */
704 surf_workstation_model->suspend(action->comm.surf_comm);
707 void SIMIX_comm_resume(smx_action_t action)
709 /*FIXME: check what happen with the timeouts */
710 surf_workstation_model->resume(action->comm.surf_comm);
714 /************* Action Getters **************/
717 * \brief get the amount remaining from the communication
718 * \param action The communication
720 double SIMIX_comm_get_remains(smx_action_t action)
728 switch (action->state) {
731 remains = surf_workstation_model->get_remains(action->comm.surf_comm);
736 remains = 0; /*FIXME: check what should be returned */
740 remains = 0; /*FIXME: is this correct? */
746 e_smx_state_t SIMIX_comm_get_state(smx_action_t action)
748 return action->state;
752 * \brief Return the user data associated to the sender of the communication
753 * \param action The communication
754 * \return the user data
756 void* SIMIX_comm_get_src_data(smx_action_t action)
758 return action->comm.src_data;
762 * \brief Return the user data associated to the receiver of the communication
763 * \param action The communication
764 * \return the user data
766 void* SIMIX_comm_get_dst_data(smx_action_t action)
768 return action->comm.dst_data;
771 smx_process_t SIMIX_comm_get_src_proc(smx_action_t action)
773 return action->comm.src_proc;
776 smx_process_t SIMIX_comm_get_dst_proc(smx_action_t action)
778 return action->comm.dst_proc;
781 #ifdef HAVE_LATENCY_BOUND_TRACKING
783 * \brief verify if communication is latency bounded
784 * \param comm The communication
786 XBT_INLINE int SIMIX_comm_is_latency_bounded(smx_action_t action)
791 if (action->comm.surf_comm){
792 XBT_DEBUG("Getting latency limited for surf_action (%p)", action->comm.surf_comm);
793 action->latency_limited = surf_workstation_model->get_latency_limited(action->comm.surf_comm);
794 XBT_DEBUG("Action limited is %d", action->latency_limited);
796 return action->latency_limited;
800 /******************************************************************************/
801 /* SIMIX_comm_copy_data callbacks */
802 /******************************************************************************/
803 static void (*SIMIX_comm_copy_data_callback) (smx_action_t, size_t) =
804 &SIMIX_comm_copy_pointer_callback;
807 SIMIX_comm_set_copy_data_callback(void (*callback) (smx_action_t, size_t))
809 SIMIX_comm_copy_data_callback = callback;
812 void SIMIX_comm_copy_pointer_callback(smx_action_t comm, size_t buff_size)
814 xbt_assert((buff_size == sizeof(void *)),
815 "Cannot copy %zu bytes: must be sizeof(void*)", buff_size);
816 *(void **) (comm->comm.dst_buff) = comm->comm.src_buff;
819 void SIMIX_comm_copy_buffer_callback(smx_action_t comm, size_t buff_size)
821 memcpy(comm->comm.dst_buff, comm->comm.src_buff, buff_size);
825 * \brief Copy the communication data from the sender's buffer to the receiver's one
826 * \param comm The communication
828 void SIMIX_comm_copy_data(smx_action_t comm)
830 size_t buff_size = comm->comm.src_buff_size;
831 /* If there is no data to be copy then return */
832 if (!comm->comm.src_buff || !comm->comm.dst_buff || comm->comm.copied == 1)
835 XBT_DEBUG("Copying comm %p data from %s (%p) -> %s (%p) (%zu bytes)",
837 comm->comm.src_proc->smx_host->name, comm->comm.src_buff,
838 comm->comm.dst_proc->smx_host->name, comm->comm.dst_buff, buff_size);
840 /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
841 if (comm->comm.dst_buff_size)
842 buff_size = MIN(buff_size, *(comm->comm.dst_buff_size));
844 /* Update the receiver's buffer size to the copied amount */
845 if (comm->comm.dst_buff_size)
846 *comm->comm.dst_buff_size = buff_size;
851 (*SIMIX_comm_copy_data_callback) (comm, buff_size);
853 /* Set the copied flag so we copy data only once */
854 /* (this function might be called from both communication ends) */
855 comm->comm.copied = 1;