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_backtrace_display_current();
249 xbt_die("the refcount of comm %p is already 0 before decreasing it. "
250 "That's a bug!", action);
253 action->comm.refcount--;
254 if (action->comm.refcount > 0)
256 XBT_DEBUG("Really free communication %p; refcount is now %d", action,
257 action->comm.refcount);
259 #ifdef HAVE_LATENCY_BOUND_TRACKING
260 action->latency_limited = SIMIX_comm_is_latency_bounded( action ) ;
263 xbt_free(action->name);
264 SIMIX_comm_destroy_internal_actions(action);
266 if (action->comm.detached && action->state != SIMIX_DONE) {
267 /* the communication has failed and was detached:
268 * we have to free the buffer */
269 ((void_f_pvoid_t) action->comm.src_data)(action->comm.src_buff);
272 xbt_mallocator_release(simix_global->action_mallocator, action);
275 void SIMIX_comm_destroy_internal_actions(smx_action_t action)
277 if (action->comm.surf_comm){
278 #ifdef HAVE_LATENCY_BOUND_TRACKING
279 action->latency_limited = SIMIX_comm_is_latency_bounded(action);
281 action->comm.surf_comm->model_type->action_unref(action->comm.surf_comm);
282 action->comm.surf_comm = NULL;
285 if (action->comm.src_timeout){
286 action->comm.src_timeout->model_type->action_unref(action->comm.src_timeout);
287 action->comm.src_timeout = NULL;
290 if (action->comm.dst_timeout){
291 action->comm.dst_timeout->model_type->action_unref(action->comm.dst_timeout);
292 action->comm.dst_timeout = NULL;
296 smx_action_t SIMIX_comm_isend(smx_process_t src_proc, smx_rdv_t rdv,
297 double task_size, double rate,
298 void *src_buff, size_t src_buff_size,
299 int (*match_fun)(void *, void *), void *data,
304 /* Look for communication request matching our needs.
305 If it is not found then create it and push it into the rendez-vous point */
306 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_RECEIVE, match_fun, data);
309 action = SIMIX_comm_new(SIMIX_COMM_SEND);
310 SIMIX_rdv_push(rdv, action);
312 action->state = SIMIX_READY;
313 action->comm.type = SIMIX_COMM_READY;
316 /* If the communication action is detached then decrease the refcount
317 * by one, so it will be eliminated by the receivers destroy call */
319 action->comm.detached = 1;
320 action->comm.refcount--;
323 /* Setup the communication request */
324 action->comm.src_proc = src_proc;
325 action->comm.task_size = task_size;
326 action->comm.rate = rate;
327 action->comm.src_buff = src_buff;
328 action->comm.src_buff_size = src_buff_size;
329 action->comm.src_data = data;
332 action->state = SIMIX_RUNNING;
336 SIMIX_comm_start(action);
337 return (detached ? NULL : action);
340 smx_action_t SIMIX_comm_irecv(smx_process_t dst_proc, smx_rdv_t rdv,
341 void *dst_buff, size_t *dst_buff_size,
342 int (*match_fun)(void *, void *), void *data)
346 /* Look for communication request matching our needs.
347 * If it is not found then create it and push it into the rendez-vous point
349 action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_SEND, match_fun, data);
352 action = SIMIX_comm_new(SIMIX_COMM_RECEIVE);
353 SIMIX_rdv_push(rdv, action);
355 action->state = SIMIX_READY;
356 action->comm.type = SIMIX_COMM_READY;
359 /* Setup communication request */
360 action->comm.dst_proc = dst_proc;
361 action->comm.dst_buff = dst_buff;
362 action->comm.dst_buff_size = dst_buff_size;
363 action->comm.dst_data = data;
366 action->state = SIMIX_RUNNING;
370 SIMIX_comm_start(action);
374 void SIMIX_pre_comm_wait(smx_req_t req, smx_action_t action, double timeout, int idx)
376 /* the request may be a wait, a send or a recv */
379 /* Associate this request to the action */
380 xbt_fifo_push(action->request_list, req);
381 req->issuer->waiting_action = action;
385 action->state = SIMIX_DONE;
387 /* If we reached this point, the wait request must have a timeout */
388 /* Otherwise it shouldn't be enabled and executed by the MC */
392 if (action->comm.src_proc == req->issuer)
393 action->state = SIMIX_SRC_TIMEOUT;
395 action->state = SIMIX_DST_TIMEOUT;
398 SIMIX_comm_finish(action);
402 /* If the action has already finish perform the error handling, */
403 /* otherwise set up a waiting timeout on the right side */
404 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
405 SIMIX_comm_finish(action);
406 } 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 */
407 sleep = surf_workstation_model->extension.workstation.sleep(req->issuer->smx_host->host, timeout);
408 surf_workstation_model->action_data_set(sleep, action);
410 if (req->issuer == action->comm.src_proc)
411 action->comm.src_timeout = sleep;
413 action->comm.dst_timeout = sleep;
417 void SIMIX_pre_comm_test(smx_req_t req)
419 smx_action_t action = req->comm_test.comm;
422 req->comm_test.result = action->comm.src_proc && action->comm.dst_proc;
423 if(req->comm_test.result){
424 action->state = SIMIX_DONE;
425 xbt_fifo_push(action->request_list, req);
426 SIMIX_comm_finish(action);
428 SIMIX_request_answer(req);
433 req->comm_test.result = (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING);
434 if (req->comm_test.result) {
435 xbt_fifo_push(action->request_list, req);
436 SIMIX_comm_finish(action);
438 SIMIX_request_answer(req);
442 void SIMIX_pre_comm_testany(smx_req_t req, int idx)
446 xbt_dynar_t actions = req->comm_testany.comms;
447 req->comm_testany.result = -1;
451 SIMIX_request_answer(req);
453 action = xbt_dynar_get_as(actions, idx, smx_action_t);
454 req->comm_testany.result = idx;
455 xbt_fifo_push(action->request_list, req);
456 action->state = SIMIX_DONE;
457 SIMIX_comm_finish(action);
462 xbt_dynar_foreach(req->comm_testany.comms,cursor,action) {
463 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
464 req->comm_testany.result = cursor;
465 xbt_fifo_push(action->request_list, req);
466 SIMIX_comm_finish(action);
470 SIMIX_request_answer(req);
473 void SIMIX_pre_comm_waitany(smx_req_t req, int idx)
476 unsigned int cursor = 0;
477 xbt_dynar_t actions = req->comm_waitany.comms;
480 action = xbt_dynar_get_as(actions, idx, smx_action_t);
481 xbt_fifo_push(action->request_list, req);
482 req->comm_waitany.result = idx;
483 action->state = SIMIX_DONE;
484 SIMIX_comm_finish(action);
488 xbt_dynar_foreach(actions, cursor, action){
489 /* Associate this request to the action */
490 xbt_fifo_push(action->request_list, req);
491 if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING){
492 SIMIX_comm_finish(action);
498 void SIMIX_waitany_req_remove_from_actions(smx_req_t req)
501 unsigned int cursor = 0;
502 xbt_dynar_t actions = req->comm_waitany.comms;
504 xbt_dynar_foreach(actions, cursor, action){
505 xbt_fifo_remove(action->request_list, req);
510 * \brief Start the simulation of a communication request
511 * \param action The communication action
514 XBT_INLINE void SIMIX_comm_start(smx_action_t action)
516 /* If both the sender and the receiver are already there, start the communication */
517 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: action state = %d", action->state);
680 /* After this point the surf actions associated with the simix communicate
681 action are no longer needed, thus we delete them. */
682 SIMIX_comm_destroy_internal_actions(action);
684 /* If there are requests associated with the action, then answer them */
685 if (xbt_fifo_size(action->request_list))
686 SIMIX_comm_finish(action);
689 void SIMIX_comm_cancel(smx_action_t action)
691 /* If the action is a waiting state means that it is still in a rdv */
692 /* so remove from it and delete it */
693 if (action->state == SIMIX_WAITING) {
694 SIMIX_rdv_remove(action->comm.rdv, action);
695 action->state = SIMIX_FAILED;
697 /* When running the MC there are no surf actions */
699 surf_workstation_model->action_cancel(action->comm.surf_comm);
703 void SIMIX_comm_suspend(smx_action_t action)
705 /*FIXME: shall we suspend also the timeout actions? */
706 surf_workstation_model->suspend(action->comm.surf_comm);
709 void SIMIX_comm_resume(smx_action_t action)
711 /*FIXME: check what happen with the timeouts */
712 surf_workstation_model->resume(action->comm.surf_comm);
716 /************* Action Getters **************/
719 * \brief get the amount remaining from the communication
720 * \param action The communication
722 double SIMIX_comm_get_remains(smx_action_t action)
730 switch (action->state) {
733 remains = surf_workstation_model->get_remains(action->comm.surf_comm);
738 remains = 0; /*FIXME: check what should be returned */
742 remains = 0; /*FIXME: is this correct? */
748 e_smx_state_t SIMIX_comm_get_state(smx_action_t action)
750 return action->state;
754 * \brief Return the user data associated to the sender of the communication
755 * \param action The communication
756 * \return the user data
758 void* SIMIX_comm_get_src_data(smx_action_t action)
760 return action->comm.src_data;
764 * \brief Return the user data associated to the receiver of the communication
765 * \param action The communication
766 * \return the user data
768 void* SIMIX_comm_get_dst_data(smx_action_t action)
770 return action->comm.dst_data;
773 smx_process_t SIMIX_comm_get_src_proc(smx_action_t action)
775 return action->comm.src_proc;
778 smx_process_t SIMIX_comm_get_dst_proc(smx_action_t action)
780 return action->comm.dst_proc;
783 #ifdef HAVE_LATENCY_BOUND_TRACKING
785 * \brief verify if communication is latency bounded
786 * \param comm The communication
788 XBT_INLINE int SIMIX_comm_is_latency_bounded(smx_action_t action)
793 if (action->comm.surf_comm){
794 XBT_DEBUG("Getting latency limited for surf_action (%p)", action->comm.surf_comm);
795 action->latency_limited = surf_workstation_model->get_latency_limited(action->comm.surf_comm);
796 XBT_DEBUG("Action limited is %d", action->latency_limited);
798 return action->latency_limited;
802 /******************************************************************************/
803 /* SIMIX_comm_copy_data callbacks */
804 /******************************************************************************/
805 static void (*SIMIX_comm_copy_data_callback) (smx_action_t, size_t) =
806 &SIMIX_comm_copy_pointer_callback;
809 SIMIX_comm_set_copy_data_callback(void (*callback) (smx_action_t, size_t))
811 SIMIX_comm_copy_data_callback = callback;
814 void SIMIX_comm_copy_pointer_callback(smx_action_t comm, size_t buff_size)
816 xbt_assert((buff_size == sizeof(void *)),
817 "Cannot copy %zu bytes: must be sizeof(void*)", buff_size);
818 *(void **) (comm->comm.dst_buff) = comm->comm.src_buff;
821 void SIMIX_comm_copy_buffer_callback(smx_action_t comm, size_t buff_size)
823 memcpy(comm->comm.dst_buff, comm->comm.src_buff, buff_size);
826 void smpi_comm_copy_data_callback(smx_action_t comm, size_t buff_size)
828 memcpy(comm->comm.dst_buff, comm->comm.src_buff, buff_size);
829 if (comm->comm.detached) // if this is a detached send, the source buffer was duplicated by SMPI sender to make the original buffer available to the application ASAP
830 free(comm->comm.src_buff);
834 * \brief Copy the communication data from the sender's buffer to the receiver's one
835 * \param comm The communication
837 void SIMIX_comm_copy_data(smx_action_t comm)
839 size_t buff_size = comm->comm.src_buff_size;
840 /* If there is no data to be copy then return */
841 if (!comm->comm.src_buff || !comm->comm.dst_buff || comm->comm.copied == 1)
844 XBT_DEBUG("Copying comm %p data from %s (%p) -> %s (%p) (%zu bytes)",
846 comm->comm.src_proc->smx_host->name, comm->comm.src_buff,
847 comm->comm.dst_proc->smx_host->name, comm->comm.dst_buff, buff_size);
849 /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
850 if (comm->comm.dst_buff_size)
851 buff_size = MIN(buff_size, *(comm->comm.dst_buff_size));
853 /* Update the receiver's buffer size to the copied amount */
854 if (comm->comm.dst_buff_size)
855 *comm->comm.dst_buff_size = buff_size;
858 (*SIMIX_comm_copy_data_callback) (comm, buff_size);
860 /* Set the copied flag so we copy data only once */
861 /* (this function might be called from both communication ends) */
862 comm->comm.copied = 1;