src/simix/smx_network.c

   1 /* Copyright (c) 2009, 2010. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   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. */
   6
   7 #include "private.h"
   8 #include "xbt/log.h"
   9 #include "mc/mc.h"
  10 #include "xbt/dict.h"
  11
  12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_network, simix,
  13                                 "Logging specific to SIMIX (network)");
  14
  15 static xbt_dict_t rdv_points = NULL;
  16 unsigned long int smx_total_comms = 0;
  17
  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);
  26
  27 void SIMIX_network_init(void)
  28 {
  29   rdv_points = xbt_dict_new();
  30 }
  31
  32 void SIMIX_network_exit(void)
  33 {
  34   xbt_dict_free(&rdv_points);
  35 }
  36
  37 /******************************************************************************/
  38 /*                           Rendez-Vous Points                               */
  39 /******************************************************************************/
  40
  41 smx_rdv_t SIMIX_rdv_create(const char *name)
  42 {
  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;
  45
  46   if (!rdv) {
  47     rdv = xbt_new0(s_smx_rvpoint_t, 1);
  48     rdv->name = name ? xbt_strdup(name) : NULL;
  49     rdv->comm_fifo = xbt_fifo_new();
  50
  51     if (rdv->name)
  52       xbt_dict_set(rdv_points, rdv->name, rdv, SIMIX_rdv_free);
  53   }
  54   return rdv;
  55 }
  56
  57 void SIMIX_rdv_destroy(smx_rdv_t rdv)
  58 {
  59   if (rdv->name)
  60     xbt_dict_remove(rdv_points, rdv->name);
  61 }
  62
  63 void SIMIX_rdv_free(void *data)
  64 {
  65   smx_rdv_t rdv = (smx_rdv_t) data;
  66   xbt_free(rdv->name);
  67   xbt_fifo_free(rdv->comm_fifo);
  68   xbt_free(rdv);
  69 }
  70
  71 smx_rdv_t SIMIX_rdv_get_by_name(const char *name)
  72 {
  73   return xbt_dict_get_or_null(rdv_points, name);
  74 }
  75
  76 int SIMIX_rdv_comm_count_by_host(smx_rdv_t rdv, smx_host_t host)
  77 {
  78   smx_action_t comm = NULL;
  79   xbt_fifo_item_t item = NULL;
  80   int count = 0;
  81
  82   xbt_fifo_foreach(rdv->comm_fifo, item, comm, smx_action_t) {
  83     if (comm->comm.src_proc->smx_host == host)
  84       count++;
  85   }
  86
  87   return count;
  88 }
  89
  90 smx_action_t SIMIX_rdv_get_head(smx_rdv_t rdv)
  91 {
  92   return xbt_fifo_get_item_content(xbt_fifo_get_first_item(rdv->comm_fifo));
  93 }
  94
  95 /**
  96  *  \brief Push a communication request into a rendez-vous point
  97  *  \param rdv The rendez-vous point
  98  *  \param comm The communication request
  99  */
 100 static XBT_INLINE void SIMIX_rdv_push(smx_rdv_t rdv, smx_action_t comm)
 101 {
 102   xbt_fifo_push(rdv->comm_fifo, comm);
 103   comm->comm.rdv = rdv;
 104 }
 105
 106 /**
 107  *  \brief Remove a communication request from a rendez-vous point
 108  *  \param rdv The rendez-vous point
 109  *  \param comm The communication request
 110  */
 111 static XBT_INLINE void SIMIX_rdv_remove(smx_rdv_t rdv, smx_action_t comm)
 112 {
 113   xbt_fifo_remove(rdv->comm_fifo, comm);
 114   comm->comm.rdv = NULL;
 115 }
 116
 117 /**
 118  *  \brief Wrapper to SIMIX_rdv_get_request
 119  */
 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);
 122 }
 123
 124 /**
 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
 128  */
 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)
 131 {
 132   // FIXME rewrite this function by using SIMIX_rdv_has_send/recv_match
 133   smx_action_t action;
 134   xbt_fifo_item_t item;
 135   void* req_data = NULL;
 136
 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;
 142     }
 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;
 149       return action;
 150     }
 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);
 154   }
 155   XBT_DEBUG("No matching communication action found");
 156   return NULL;
 157 }
 158
 159 /**
 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
 163  */
 164 int SIMIX_comm_has_send_match(smx_rdv_t rdv, int (*match_fun)(void*, void*), void* data) {
 165
 166   smx_action_t action;
 167   xbt_fifo_item_t item;
 168
 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);
 173       return 1;
 174     }
 175   }
 176   XBT_DEBUG("No matching communication action found");
 177   return 0;
 178 }
 179
 180 /**
 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
 184  */
 185 int SIMIX_comm_has_recv_match(smx_rdv_t rdv, int (*match_fun)(void*, void*), void* data) {
 186
 187   smx_action_t action;
 188   xbt_fifo_item_t item;
 189
 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);
 194       return 1;
 195     }
 196   }
 197   XBT_DEBUG("No matching communication action found");
 198   return 0;
 199 }
 200
 201 /******************************************************************************/
 202 /*                            Comunication Actions                            */
 203 /******************************************************************************/
 204
 205 /**
 206  *  \brief Creates a new comunicate action
 207  *  \param type The type of request (comm_send, comm_recv)
 208  *  \return The new comunicate action
 209  */
 210 smx_action_t SIMIX_comm_new(e_smx_comm_type_t type)
 211 {
 212   smx_action_t act;
 213
 214   /* alloc structures */
 215   act = xbt_mallocator_get(simix_global->action_mallocator);
 216
 217   act->type = SIMIX_ACTION_COMMUNICATE;
 218   act->state = SIMIX_WAITING;
 219
 220   /* set communication */
 221   act->comm.type = type;
 222   act->comm.refcount = 1;
 223
 224 #ifdef HAVE_LATENCY_BOUND_TRACKING
 225   //initialize with unknown value
 226   act->latency_limited = -1;
 227 #endif
 228
 229 #ifdef HAVE_TRACING
 230   act->category = NULL;
 231 #endif
 232
 233   XBT_DEBUG("Create communicate action %p", act);
 234   ++smx_total_comms;
 235
 236   return act;
 237 }
 238
 239 /**
 240  *  \brief Destroy a communicate action
 241  *  \param action The communicate action to be destroyed
 242  */
 243 void SIMIX_comm_destroy(smx_action_t action)
 244 {
 245   XBT_DEBUG("Destroy action %p (refcount: %d), state: %d",
 246       action, action->comm.refcount, action->state);
 247
 248   xbt_assert(action->comm.refcount > 0,
 249       "The refcount of comm %p is already 0 before decreasing it. "
 250       "That's a bug!", action);
 251
 252   action->comm.refcount--;
 253   if (action->comm.refcount > 0)
 254     return;
 255   XBT_DEBUG("Really free communication %p; refcount is now %d", action,
 256         action->comm.refcount);
 257
 258 #ifdef HAVE_LATENCY_BOUND_TRACKING
 259     action->latency_limited = SIMIX_comm_is_latency_bounded( action ) ;
 260 #endif
 261
 262   xbt_free(action->name);
 263   SIMIX_comm_destroy_internal_actions(action);
 264
 265   if (action->comm.detached && action->state != SIMIX_DONE) {
 266     /* the communication has failed and was detached:
 267      * we have to free the buffer */
 268     ((void_f_pvoid_t) action->comm.src_data)(action->comm.src_buff);
 269   }
 270
 271   xbt_mallocator_release(simix_global->action_mallocator, action);
 272 }
 273
 274 void SIMIX_comm_destroy_internal_actions(smx_action_t action)
 275 {
 276   if (action->comm.surf_comm){
 277 #ifdef HAVE_LATENCY_BOUND_TRACKING
 278     action->latency_limited = SIMIX_comm_is_latency_bounded(action);
 279 #endif
 280     action->comm.surf_comm->model_type->action_unref(action->comm.surf_comm);
 281     action->comm.surf_comm = NULL;
 282   }
 283
 284   if (action->comm.src_timeout){
 285     action->comm.src_timeout->model_type->action_unref(action->comm.src_timeout);
 286     action->comm.src_timeout = NULL;
 287   }
 288
 289   if (action->comm.dst_timeout){
 290     action->comm.dst_timeout->model_type->action_unref(action->comm.dst_timeout);
 291     action->comm.dst_timeout = NULL;
 292   }
 293 }
 294
 295 smx_action_t SIMIX_comm_isend(smx_process_t src_proc, smx_rdv_t rdv,
 296                               double task_size, double rate,
 297                               void *src_buff, size_t src_buff_size,
 298                               int (*match_fun)(void *, void *), void *data,
 299                               int detached)
 300 {
 301   smx_action_t action;
 302
 303   /* Look for communication request matching our needs.
 304      If it is not found then create it and push it into the rendez-vous point */
 305   action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_RECEIVE, match_fun, data);
 306
 307   if (!action) {
 308     action = SIMIX_comm_new(SIMIX_COMM_SEND);
 309     SIMIX_rdv_push(rdv, action);
 310   } else {
 311     action->state = SIMIX_READY;
 312     action->comm.type = SIMIX_COMM_READY;
 313   }
 314   xbt_fifo_push(src_proc->comms, action);
 315
 316   /* if the communication action is detached then decrease the refcount
 317    * by one, so it will be eliminated by the receiver's destroy call */
 318   if (detached) {
 319     action->comm.detached = 1;
 320     action->comm.refcount--;
 321   }
 322
 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;
 330
 331   if (MC_IS_ENABLED) {
 332     action->state = SIMIX_RUNNING;
 333     return action;
 334   }
 335
 336   SIMIX_comm_start(action);
 337   return action;
 338 }
 339
 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)
 343 {
 344   smx_action_t action;
 345
 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
 348    */
 349   action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_SEND, match_fun, data);
 350
 351   if (!action) {
 352     action = SIMIX_comm_new(SIMIX_COMM_RECEIVE);
 353     SIMIX_rdv_push(rdv, action);
 354   } else {
 355     action->state = SIMIX_READY;
 356     action->comm.type = SIMIX_COMM_READY;
 357   }
 358   xbt_fifo_push(dst_proc->comms, action);
 359
 360   /* Setup communication request */
 361   action->comm.dst_proc = dst_proc;
 362   action->comm.dst_buff = dst_buff;
 363   action->comm.dst_buff_size = dst_buff_size;
 364   action->comm.dst_data = data;
 365
 366   if (MC_IS_ENABLED) {
 367     action->state = SIMIX_RUNNING;
 368     return action;
 369   }
 370
 371   SIMIX_comm_start(action);
 372   return action;
 373 }
 374
 375 void SIMIX_pre_comm_wait(smx_req_t req, smx_action_t action, double timeout, int idx)
 376 {
 377   /* the request may be a wait, a send or a recv */
 378   surf_action_t sleep;
 379
 380   /* Associate this request to the action */
 381   xbt_fifo_push(action->request_list, req);
 382   req->issuer->waiting_action = action;
 383
 384   if (MC_IS_ENABLED) {
 385     if (idx == 0) {
 386       action->state = SIMIX_DONE;
 387     } else {
 388       /* If we reached this point, the wait request must have a timeout */
 389       /* Otherwise it shouldn't be enabled and executed by the MC */
 390       if (timeout == -1)
 391         THROW_IMPOSSIBLE;
 392
 393       if (action->comm.src_proc == req->issuer)
 394         action->state = SIMIX_SRC_TIMEOUT;
 395       else
 396         action->state = SIMIX_DST_TIMEOUT;
 397     }
 398
 399     SIMIX_comm_finish(action);
 400     return;
 401   }
 402
 403   /* If the action has already finish perform the error handling, */
 404   /* otherwise set up a waiting timeout on the right side         */
 405   if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
 406     SIMIX_comm_finish(action);
 407   } 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 */
 408     sleep = surf_workstation_model->extension.workstation.sleep(req->issuer->smx_host->host, timeout);
 409     surf_workstation_model->action_data_set(sleep, action);
 410
 411     if (req->issuer == action->comm.src_proc)
 412       action->comm.src_timeout = sleep;
 413     else
 414       action->comm.dst_timeout = sleep;
 415   }
 416 }
 417
 418 void SIMIX_pre_comm_test(smx_req_t req)
 419 {
 420   smx_action_t action = req->comm_test.comm;
 421
 422   if(MC_IS_ENABLED){
 423     req->comm_test.result = action->comm.src_proc && action->comm.dst_proc;
 424     if(req->comm_test.result){
 425       action->state = SIMIX_DONE;
 426       xbt_fifo_push(action->request_list, req);
 427       SIMIX_comm_finish(action);
 428     }else{
 429       SIMIX_request_answer(req);
 430     }
 431     return;
 432   }
 433
 434   req->comm_test.result = (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING);
 435   if (req->comm_test.result) {
 436     xbt_fifo_push(action->request_list, req);
 437     SIMIX_comm_finish(action);
 438   } else {
 439     SIMIX_request_answer(req);
 440   }
 441 }
 442
 443 void SIMIX_pre_comm_testany(smx_req_t req, int idx)
 444 {
 445   unsigned int cursor;
 446   smx_action_t action;
 447   xbt_dynar_t actions = req->comm_testany.comms;
 448   req->comm_testany.result = -1;
 449
 450   if (MC_IS_ENABLED){
 451     if(idx == -1){
 452       SIMIX_request_answer(req);
 453     }else{
 454       action = xbt_dynar_get_as(actions, idx, smx_action_t);
 455       req->comm_testany.result = idx;
 456       xbt_fifo_push(action->request_list, req);
 457       action->state = SIMIX_DONE;
 458       SIMIX_comm_finish(action);
 459     }
 460     return;
 461   }
 462
 463   xbt_dynar_foreach(req->comm_testany.comms,cursor,action) {
 464     if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
 465       req->comm_testany.result = cursor;
 466       xbt_fifo_push(action->request_list, req);
 467       SIMIX_comm_finish(action);
 468       return;
 469     }
 470   }
 471   SIMIX_request_answer(req);
 472 }
 473
 474 void SIMIX_pre_comm_waitany(smx_req_t req, int idx)
 475 {
 476   smx_action_t action;
 477   unsigned int cursor = 0;
 478   xbt_dynar_t actions = req->comm_waitany.comms;
 479
 480   if (MC_IS_ENABLED){
 481     action = xbt_dynar_get_as(actions, idx, smx_action_t);
 482     xbt_fifo_push(action->request_list, req);
 483     req->comm_waitany.result = idx;
 484     action->state = SIMIX_DONE;
 485     SIMIX_comm_finish(action);
 486     return;
 487   }
 488
 489   xbt_dynar_foreach(actions, cursor, action){
 490     /* Associate this request to the action */
 491     xbt_fifo_push(action->request_list, req);
 492     if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING){
 493       SIMIX_comm_finish(action);
 494       break;
 495     }
 496   }
 497 }
 498
 499 void SIMIX_waitany_req_remove_from_actions(smx_req_t req)
 500 {
 501   smx_action_t action;
 502   unsigned int cursor = 0;
 503   xbt_dynar_t actions = req->comm_waitany.comms;
 504
 505   xbt_dynar_foreach(actions, cursor, action){
 506     xbt_fifo_remove(action->request_list, req);
 507   }
 508 }
 509
 510 /**
 511  *  \brief Start the simulation of a communication request
 512  *  \param action The communication action
 513  */
 514
 515 XBT_INLINE void SIMIX_comm_start(smx_action_t action)
 516 {
 517   /* If both the sender and the receiver are already there, start the communication */
 518   if (action->state == SIMIX_READY) {
 519
 520     smx_host_t sender = action->comm.src_proc->smx_host;
 521     smx_host_t receiver = action->comm.dst_proc->smx_host;
 522
 523     XBT_DEBUG("Starting communication %p from '%s' to '%s'", action,
 524            SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
 525
 526     action->comm.surf_comm = surf_workstation_model->extension.workstation.
 527         communicate(sender->host, receiver->host, action->comm.task_size, action->comm.rate);
 528
 529     surf_workstation_model->action_data_set(action->comm.surf_comm, action);
 530
 531     action->state = SIMIX_RUNNING;
 532
 533     /* If a link is failed, detect it immediately */
 534     if (surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED) {
 535       XBT_DEBUG("Communication from '%s' to '%s' failed to start because of a link failure",
 536           SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
 537       action->state = SIMIX_LINK_FAILURE;
 538       SIMIX_comm_destroy_internal_actions(action);
 539     }
 540
 541     /* If any of the process is suspend, create the action but stop its execution,
 542        it will be restarted when the sender process resume */
 543     if (SIMIX_process_is_suspended(action->comm.src_proc) ||
 544         SIMIX_process_is_suspended(action->comm.dst_proc)) {
 545       /* FIXME: check what should happen with the action state */
 546       surf_workstation_model->suspend(action->comm.surf_comm);
 547     }
 548   }
 549 }
 550
 551 /**
 552  * \brief Answers the SIMIX requests associated to a communication action.
 553  * \param action a finished communication action
 554  */
 555 void SIMIX_comm_finish(smx_action_t action)
 556 {
 557   unsigned int destroy_count = 0;
 558   smx_req_t req;
 559
 560   while ((req = xbt_fifo_shift(action->request_list))) {
 561
 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);
 568       if (!MC_IS_ENABLED)
 569         req->comm_waitany.result = xbt_dynar_search(req->comm_waitany.comms, &action);
 570     }
 571
 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);
 575
 576     XBT_DEBUG("SIMIX_comm_finish: action state = %d", action->state);
 577
 578     /* Check out for errors */
 579     switch (action->state) {
 580
 581       case SIMIX_DONE:
 582         XBT_DEBUG("Communication %p complete!", action);
 583         SIMIX_comm_copy_data(action);
 584         break;
 585
 586       case SIMIX_SRC_TIMEOUT:
 587         TRY {
 588           THROWF(timeout_error, 0, "Communication timeouted because of sender");
 589         }
 590         CATCH(req->issuer->running_ctx->exception) {
 591           req->issuer->doexception = 1;
 592         }
 593         break;
 594
 595       case SIMIX_DST_TIMEOUT:
 596         TRY {
 597           THROWF(timeout_error, 0, "Communication timeouted because of receiver");
 598         }
 599         CATCH(req->issuer->running_ctx->exception) {
 600           req->issuer->doexception = 1;
 601         }
 602         break;
 603
 604       case SIMIX_SRC_HOST_FAILURE:
 605         TRY {
 606           if (req->issuer == action->comm.src_proc)
 607             THROWF(host_error, 0, "Host failed");
 608           else
 609             THROWF(network_error, 0, "Remote peer failed");
 610         }
 611         CATCH(req->issuer->running_ctx->exception) {
 612           req->issuer->doexception = 1;
 613         }
 614         break;
 615
 616       case SIMIX_DST_HOST_FAILURE:
 617         TRY {
 618           if (req->issuer == action->comm.dst_proc)
 619             THROWF(host_error, 0, "Host failed");
 620           else
 621             THROWF(network_error, 0, "Remote peer failed");
 622         }
 623         CATCH(req->issuer->running_ctx->exception) {
 624           req->issuer->doexception = 1;
 625         }
 626         break;
 627
 628       case SIMIX_LINK_FAILURE:
 629         TRY {
 630           XBT_DEBUG("Link failure in action %p between '%s' and '%s': posting an exception to the issuer: %s (%p)",
 631               action,
 632               action->comm.src_proc ? action->comm.src_proc->smx_host->name : NULL,
 633               action->comm.dst_proc ? action->comm.dst_proc->smx_host->name : NULL,
 634               req->issuer->name, req->issuer);
 635           THROWF(network_error, 0, "Link failure");
 636         }
 637         CATCH(req->issuer->running_ctx->exception) {
 638           req->issuer->doexception = 1;
 639         }
 640         break;
 641
 642       case SIMIX_CANCELED:
 643         TRY {
 644           if (req->issuer == action->comm.dst_proc) {
 645             THROWF(cancel_error, 0, "Communication canceled by the sender");
 646           }
 647           else {
 648             THROWF(cancel_error, 0, "Communication canceled by the receiver");
 649           }
 650         }
 651         CATCH(req->issuer->running_ctx->exception) {
 652           req->issuer->doexception = 1;
 653         }
 654         break;
 655
 656       default:
 657         xbt_die("Unexpected action state in SIMIX_comm_finish: %d", action->state);
 658     }
 659
 660     /* if there is an exception during a waitany or a testany, indicate the position of the failed communication */
 661     if (req->issuer->doexception) {
 662       if (req->call == REQ_COMM_WAITANY) {
 663         req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_waitany.comms, &action);
 664       }
 665       else if (req->call == REQ_COMM_TESTANY) {
 666         req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_testany.comms, &action);
 667       }
 668     }
 669
 670     req->issuer->waiting_action = NULL;
 671     xbt_fifo_remove(req->issuer->comms, action);
 672     SIMIX_request_answer(req);
 673     destroy_count++;
 674   }
 675
 676   while (destroy_count-- > 0)
 677     SIMIX_comm_destroy(action);
 678 }
 679
 680 /**
 681  * \brief This function is called when a Surf communication action is finished.
 682  * \param action the corresponding Simix communication
 683  */
 684 void SIMIX_post_comm(smx_action_t action)
 685 {
 686   /* Update action state */
 687   if (action->comm.src_timeout &&
 688      surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_DONE)
 689      action->state = SIMIX_SRC_TIMEOUT;
 690   else if (action->comm.dst_timeout &&
 691           surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_DONE)
 692      action->state = SIMIX_DST_TIMEOUT;
 693   else if (action->comm.src_timeout &&
 694           surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_FAILED)
 695      action->state = SIMIX_SRC_HOST_FAILURE;
 696   else if (action->comm.dst_timeout &&
 697           surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_FAILED)
 698      action->state = SIMIX_DST_HOST_FAILURE;
 699   else if (action->comm.surf_comm &&
 700           surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED)
 701      action->state = SIMIX_LINK_FAILURE;
 702   else
 703     action->state = SIMIX_DONE;
 704
 705   XBT_DEBUG("SIMIX_post_comm: comm %p, state %d, src_proc %p, dst_proc %p, detached: %d",
 706       action, action->state, action->comm.src_proc, action->comm.dst_proc, action->comm.detached);
 707
 708   /* destroy the surf actions associated with the Simix communication */
 709   SIMIX_comm_destroy_internal_actions(action);
 710
 711   /* remove the communication action from the list of pending communications
 712    * of both processes (if they still exist) */
 713   if (action->comm.src_proc) {
 714     xbt_fifo_remove(action->comm.src_proc->comms, action);
 715   }
 716   if (action->comm.dst_proc) {
 717     xbt_fifo_remove(action->comm.dst_proc->comms, action);
 718   }
 719
 720   /* if there are requests associated with the action, then answer them */
 721   if (xbt_fifo_size(action->request_list)) {
 722     SIMIX_comm_finish(action);
 723   }
 724 }
 725
 726 void SIMIX_comm_cancel(smx_action_t action)
 727 {
 728   /* if the action is a waiting state means that it is still in a rdv */
 729   /* so remove from it and delete it */
 730   if (action->state == SIMIX_WAITING) {
 731     SIMIX_rdv_remove(action->comm.rdv, action);
 732     action->state = SIMIX_CANCELED;
 733   }
 734   else if (!MC_IS_ENABLED /* when running the MC there are no surf actions */
 735       && (action->state == SIMIX_READY || action->state == SIMIX_RUNNING)) {
 736
 737     surf_workstation_model->action_cancel(action->comm.surf_comm);
 738   }
 739 }
 740
 741 void SIMIX_comm_suspend(smx_action_t action)
 742 {
 743   /*FIXME: shall we suspend also the timeout actions? */
 744   surf_workstation_model->suspend(action->comm.surf_comm);
 745 }
 746
 747 void SIMIX_comm_resume(smx_action_t action)
 748 {
 749   /*FIXME: check what happen with the timeouts */
 750   surf_workstation_model->resume(action->comm.surf_comm);
 751 }
 752
 753
 754 /************* Action Getters **************/
 755
 756 /**
 757  *  \brief get the amount remaining from the communication
 758  *  \param action The communication
 759  */
 760 double SIMIX_comm_get_remains(smx_action_t action)
 761 {
 762   double remains;
 763
 764   if(!action){
 765       return 0;
 766   }
 767
 768   switch (action->state) {
 769
 770     case SIMIX_RUNNING:
 771       remains = surf_workstation_model->get_remains(action->comm.surf_comm);
 772       break;
 773
 774     case SIMIX_WAITING:
 775     case SIMIX_READY:
 776       remains = 0; /*FIXME: check what should be returned */
 777       break;
 778
 779     default:
 780       remains = 0; /*FIXME: is this correct? */
 781       break;
 782   }
 783   return remains;
 784 }
 785
 786 e_smx_state_t SIMIX_comm_get_state(smx_action_t action)
 787 {
 788   return action->state;
 789 }
 790
 791 /**
 792  *  \brief Return the user data associated to the sender of the communication
 793  *  \param action The communication
 794  *  \return the user data
 795  */
 796 void* SIMIX_comm_get_src_data(smx_action_t action)
 797 {
 798   return action->comm.src_data;
 799 }
 800
 801 /**
 802  *  \brief Return the user data associated to the receiver of the communication
 803  *  \param action The communication
 804  *  \return the user data
 805  */
 806 void* SIMIX_comm_get_dst_data(smx_action_t action)
 807 {
 808   return action->comm.dst_data;
 809 }
 810
 811 smx_process_t SIMIX_comm_get_src_proc(smx_action_t action)
 812 {
 813   return action->comm.src_proc;
 814 }
 815
 816 smx_process_t SIMIX_comm_get_dst_proc(smx_action_t action)
 817 {
 818   return action->comm.dst_proc;
 819 }
 820
 821 #ifdef HAVE_LATENCY_BOUND_TRACKING
 822 /**
 823  *  \brief verify if communication is latency bounded
 824  *  \param comm The communication
 825  */
 826 XBT_INLINE int SIMIX_comm_is_latency_bounded(smx_action_t action)
 827 {
 828   if(!action){
 829       return 0;
 830   }
 831   if (action->comm.surf_comm){
 832       XBT_DEBUG("Getting latency limited for surf_action (%p)", action->comm.surf_comm);
 833       action->latency_limited = surf_workstation_model->get_latency_limited(action->comm.surf_comm);
 834       XBT_DEBUG("Action limited is %d", action->latency_limited);
 835   }
 836   return action->latency_limited;
 837 }
 838 #endif
 839
 840 /******************************************************************************/
 841 /*                    SIMIX_comm_copy_data callbacks                       */
 842 /******************************************************************************/
 843 static void (*SIMIX_comm_copy_data_callback) (smx_action_t, size_t) =
 844     &SIMIX_comm_copy_pointer_callback;
 845
 846 void
 847 SIMIX_comm_set_copy_data_callback(void (*callback) (smx_action_t, size_t))
 848 {
 849   SIMIX_comm_copy_data_callback = callback;
 850 }
 851
 852 void SIMIX_comm_copy_pointer_callback(smx_action_t comm, size_t buff_size)
 853 {
 854   xbt_assert((buff_size == sizeof(void *)),
 855               "Cannot copy %zu bytes: must be sizeof(void*)", buff_size);
 856   *(void **) (comm->comm.dst_buff) = comm->comm.src_buff;
 857 }
 858
 859 void SIMIX_comm_copy_buffer_callback(smx_action_t comm, size_t buff_size)
 860 {
 861   memcpy(comm->comm.dst_buff, comm->comm.src_buff, buff_size);
 862 }
 863
 864 /**
 865  *  \brief Copy the communication data from the sender's buffer to the receiver's one
 866  *  \param comm The communication
 867  */
 868 void SIMIX_comm_copy_data(smx_action_t comm)
 869 {
 870   size_t buff_size = comm->comm.src_buff_size;
 871   /* If there is no data to be copy then return */
 872   if (!comm->comm.src_buff || !comm->comm.dst_buff || comm->comm.copied == 1)
 873     return;
 874
 875   XBT_DEBUG("Copying comm %p data from %s (%p) -> %s (%p) (%zu bytes)",
 876          comm,
 877          comm->comm.src_proc->smx_host->name, comm->comm.src_buff,
 878          comm->comm.dst_proc->smx_host->name, comm->comm.dst_buff, buff_size);
 879
 880   /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
 881   if (comm->comm.dst_buff_size)
 882     buff_size = MIN(buff_size, *(comm->comm.dst_buff_size));
 883
 884   /* Update the receiver's buffer size to the copied amount */
 885   if (comm->comm.dst_buff_size)
 886     *comm->comm.dst_buff_size = buff_size;
 887
 888   if (buff_size == 0)
 889     return;
 890
 891   SIMIX_comm_copy_data_callback(comm, buff_size);
 892
 893   /* Set the copied flag so we copy data only once */
 894   /* (this function might be called from both communication ends) */
 895   comm->comm.copied = 1;
 896 }