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
  17 static XBT_INLINE void SIMIX_comm_start(smx_action_t action);
  18 static void SIMIX_comm_finish(smx_action_t action);
  19 static void SIMIX_waitany_req_remove_from_actions(smx_req_t req);
  20 static void SIMIX_comm_copy_data(smx_action_t comm);
  21 static smx_action_t SIMIX_comm_new(e_smx_comm_type_t type);
  22 static XBT_INLINE void SIMIX_comm_wait_for_completion(smx_action_t comm,
  23                                                       double timeout);
  24 static XBT_INLINE void SIMIX_rdv_push(smx_rdv_t rdv, smx_action_t comm);
  25 static XBT_INLINE void SIMIX_rdv_remove(smx_rdv_t rdv, smx_action_t comm);
  26 static smx_action_t SIMIX_rdv_get_request(smx_rdv_t rdv, e_smx_comm_type_t type,
  27                                                                                   int (*match_fun)(void *, void *), void *);
  28 static void SIMIX_rdv_free(void *data);
  29
  30 void SIMIX_network_init(void)
  31 {
  32   rdv_points = xbt_dict_new();
  33 }
  34
  35 void SIMIX_network_exit(void)
  36 {
  37   xbt_dict_free(&rdv_points);
  38 }
  39
  40 /******************************************************************************/
  41 /*                           Rendez-Vous Points                               */
  42 /******************************************************************************/
  43
  44 smx_rdv_t SIMIX_rdv_create(const char *name)
  45 {
  46   /* two processes may have pushed the same rdv_create request at the same time */
  47   smx_rdv_t rdv = name ? xbt_dict_get_or_null(rdv_points, name) : NULL;
  48
  49   if (!rdv) {
  50     rdv = xbt_new0(s_smx_rvpoint_t, 1);
  51     rdv->name = name ? xbt_strdup(name) : NULL;
  52     rdv->comm_fifo = xbt_fifo_new();
  53
  54     if (rdv->name)
  55       xbt_dict_set(rdv_points, rdv->name, rdv, SIMIX_rdv_free);
  56   }
  57   return rdv;
  58 }
  59
  60 void SIMIX_rdv_destroy(smx_rdv_t rdv)
  61 {
  62   if (rdv->name)
  63     xbt_dict_remove(rdv_points, rdv->name);
  64 }
  65
  66 void SIMIX_rdv_free(void *data)
  67 {
  68   smx_rdv_t rdv = (smx_rdv_t) data;
  69   if (rdv->name)
  70     xbt_free(rdv->name);
  71   xbt_fifo_free(rdv->comm_fifo);
  72   xbt_free(rdv);
  73 }
  74
  75 smx_rdv_t SIMIX_rdv_get_by_name(const char *name)
  76 {
  77   return xbt_dict_get_or_null(rdv_points, name);
  78 }
  79
  80 int SIMIX_rdv_comm_count_by_host(smx_rdv_t rdv, smx_host_t host)
  81 {
  82   smx_action_t comm = NULL;
  83   xbt_fifo_item_t item = NULL;
  84   int count = 0;
  85
  86   xbt_fifo_foreach(rdv->comm_fifo, item, comm, smx_action_t) {
  87     if (comm->comm.src_proc->smx_host == host)
  88       count++;
  89   }
  90
  91   return count;
  92 }
  93
  94 smx_action_t SIMIX_rdv_get_head(smx_rdv_t rdv)
  95 {
  96   return xbt_fifo_get_item_content(xbt_fifo_get_first_item(rdv->comm_fifo));
  97 }
  98
  99 /**
 100  *  \brief Push a communication request into a rendez-vous point
 101  *  \param rdv The rendez-vous point
 102  *  \param comm The communication request
 103  */
 104 static XBT_INLINE void SIMIX_rdv_push(smx_rdv_t rdv, smx_action_t comm)
 105 {
 106   xbt_fifo_push(rdv->comm_fifo, comm);
 107   comm->comm.rdv = rdv;
 108 }
 109
 110 /**
 111  *  \brief Remove a communication request from a rendez-vous point
 112  *  \param rdv The rendez-vous point
 113  *  \param comm The communication request
 114  */
 115 static XBT_INLINE void SIMIX_rdv_remove(smx_rdv_t rdv, smx_action_t comm)
 116 {
 117   xbt_fifo_remove(rdv->comm_fifo, comm);
 118   comm->comm.rdv = NULL;
 119 }
 120
 121 /**
 122  *  \brief Checks if there is a communication action queued in a rendez-vous matching our needs
 123  *  \param type The type of communication we are looking for (comm_send, comm_recv)
 124  *  \return The communication action if found, NULL otherwise
 125  */
 126 smx_action_t SIMIX_rdv_get_request(smx_rdv_t rdv, e_smx_comm_type_t type,
 127                                    int (*match_fun)(void *, void *), void *data)
 128 {
 129   smx_action_t action;
 130   xbt_fifo_item_t item;
 131   void* req_data = NULL;
 132
 133   xbt_fifo_foreach(rdv->comm_fifo, item, action, smx_action_t){
 134     if (action->comm.type == SIMIX_COMM_SEND) {
 135       req_data = action->comm.src_data;
 136     } else if (action->comm.type == SIMIX_COMM_RECEIVE) {
 137       req_data = action->comm.dst_data;
 138     }
 139     if (action->comm.type == type && (!match_fun || match_fun(data, req_data))) {
 140       DEBUG1("Found a matching communication action %p", action);
 141       xbt_fifo_remove_item(rdv->comm_fifo, item);
 142       xbt_fifo_free_item(item);
 143       action->comm.refcount++;
 144       action->comm.rdv = NULL;
 145       return action;
 146     }
 147     DEBUG3("Sorry, communication action %p does not match our needs:"
 148            " its type is %d but we are looking for a comm of type %d",
 149            action, action->comm.type, type);
 150   }
 151   DEBUG0("No matching communication action found");
 152   return NULL;
 153 }
 154
 155 /******************************************************************************/
 156 /*                            Comunication Actions                            */
 157 /******************************************************************************/
 158
 159 /**
 160  *  \brief Creates a new comunicate action
 161  *  \param type The type of request (comm_send, comm_recv)
 162  *  \return The new comunicate action
 163  */
 164 smx_action_t SIMIX_comm_new(e_smx_comm_type_t type)
 165 {
 166   smx_action_t act;
 167
 168   /* alloc structures */
 169   act = xbt_new0(s_smx_action_t, 1);
 170   act->type = SIMIX_ACTION_COMMUNICATE;
 171   act->state = SIMIX_WAITING;
 172   act->request_list = xbt_fifo_new();
 173
 174   /* set communication */
 175   act->comm.type = type;
 176   act->comm.refcount = 1;
 177
 178 #ifdef HAVE_LATENCY_BOUND_TRACKING
 179   //initialize with unknown value
 180   act->latency_limited = -1;
 181 #endif
 182
 183 #ifdef HAVE_TRACING
 184   act->category = NULL;
 185 #endif
 186
 187   DEBUG1("Create communicate action %p", act);
 188
 189   return act;
 190 }
 191
 192 /**
 193  *  \brief Destroy a communicate action
 194  *  \param action The communicate action to be destroyed
 195  */
 196 void SIMIX_comm_destroy(smx_action_t action)
 197 {
 198   DEBUG2("Destroy action %p (refcount:%d)", action, action->comm.refcount);
 199
 200   if (action->comm.refcount <= 0)
 201     xbt_die(bprintf("the refcount of comm %p is already 0 before decreasing it. That's a bug!",action));
 202
 203   action->comm.refcount--;
 204   if (action->comm.refcount > 0)
 205     return;
 206   DEBUG2("Really free communication %p; refcount is now %d", action,
 207         action->comm.refcount);
 208
 209 #ifdef HAVE_LATENCY_BOUND_TRACKING
 210     action->latency_limited = SIMIX_comm_is_latency_bounded( action ) ;
 211 #endif
 212
 213 #ifdef HAVE_TRACING
 214   TRACE_smx_action_destroy(action);
 215 #endif
 216
 217   if (action->name)
 218     xbt_free(action->name);
 219
 220   xbt_fifo_free(action->request_list);
 221
 222   SIMIX_comm_destroy_internal_actions(action);
 223
 224   xbt_free(action);
 225 }
 226
 227 void SIMIX_comm_destroy_internal_actions(smx_action_t action)
 228 {
 229   if (action->comm.surf_comm){
 230 #ifdef HAVE_LATENCY_BOUND_TRACKING
 231     action->latency_limited = SIMIX_comm_is_latency_bounded(action);
 232 #endif
 233     action->comm.surf_comm->model_type->action_unref(action->comm.surf_comm);
 234     action->comm.surf_comm = NULL;
 235   }
 236
 237   if (action->comm.src_timeout){
 238     action->comm.src_timeout->model_type->action_unref(action->comm.src_timeout);
 239     action->comm.src_timeout = NULL;
 240   }
 241
 242   if (action->comm.dst_timeout){
 243     action->comm.dst_timeout->model_type->action_unref(action->comm.dst_timeout);
 244     action->comm.dst_timeout = NULL;
 245   }
 246 }
 247
 248 smx_action_t SIMIX_comm_isend(smx_process_t src_proc, smx_rdv_t rdv,
 249                               double task_size, double rate,
 250                               void *src_buff, size_t src_buff_size,
 251                               int (*match_fun)(void *, void *), void *data)
 252 {
 253   smx_action_t action;
 254
 255   /* Look for communication request matching our needs.
 256      If it is not found then create it and push it into the rendez-vous point */
 257   action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_RECEIVE, match_fun, data);
 258
 259   if (!action) {
 260     action = SIMIX_comm_new(SIMIX_COMM_SEND);
 261     SIMIX_rdv_push(rdv, action);
 262   } else {
 263     action->state = SIMIX_READY;
 264     action->comm.type = SIMIX_COMM_READY;
 265   }
 266
 267   /* Setup the communication request */
 268   action->comm.src_proc = src_proc;
 269   action->comm.task_size = task_size;
 270   action->comm.rate = rate;
 271   action->comm.src_buff = src_buff;
 272   action->comm.src_buff_size = src_buff_size;
 273   action->comm.src_data = data;
 274
 275   if (MC_IS_ENABLED) {
 276     action->state = SIMIX_RUNNING;
 277     return action;
 278   }
 279
 280   SIMIX_comm_start(action);
 281   return action;
 282 }
 283
 284 smx_action_t SIMIX_comm_irecv(smx_process_t dst_proc, smx_rdv_t rdv,
 285                       void *dst_buff, size_t *dst_buff_size,
 286                       int (*match_fun)(void *, void *), void *data)
 287 {
 288   smx_action_t action;
 289
 290   /* Look for communication request matching our needs.
 291    * If it is not found then create it and push it into the rendez-vous point
 292    */
 293   action = SIMIX_rdv_get_request(rdv, SIMIX_COMM_SEND, match_fun, data);
 294
 295   if (!action) {
 296     action = SIMIX_comm_new(SIMIX_COMM_RECEIVE);
 297     SIMIX_rdv_push(rdv, action);
 298   } else {
 299     action->state = SIMIX_READY;
 300     action->comm.type = SIMIX_COMM_READY;
 301   }
 302
 303   /* Setup communication request */
 304   action->comm.dst_proc = dst_proc;
 305   action->comm.dst_buff = dst_buff;
 306   action->comm.dst_buff_size = dst_buff_size;
 307   action->comm.dst_data = data;
 308
 309   if (MC_IS_ENABLED) {
 310     action->state = SIMIX_RUNNING;
 311     return action;
 312   }
 313
 314   SIMIX_comm_start(action);
 315   return action;
 316 }
 317
 318 void SIMIX_pre_comm_wait(smx_req_t req, int idx)
 319 {
 320   smx_action_t action = req->comm_wait.comm;
 321   double timeout = req->comm_wait.timeout;
 322   surf_action_t sleep;
 323
 324   /* Associate this request to the action */
 325   xbt_fifo_push(action->request_list, req);
 326   req->issuer->waiting_action = action;
 327
 328   if (MC_IS_ENABLED){
 329     if(idx == 0){
 330       action->state = SIMIX_DONE;
 331     }else{
 332       /* If we reached this point, the wait request must have a timeout */
 333       /* Otherwise it shouldn't be enabled and executed by the MC */
 334       if(timeout == -1)
 335         THROW_IMPOSSIBLE;
 336
 337       if(action->comm.src_proc == req->issuer)
 338         action->state = SIMIX_SRC_TIMEOUT;
 339       else
 340         action->state = SIMIX_DST_TIMEOUT;
 341     }
 342
 343     SIMIX_comm_finish(action);
 344     return;
 345   }
 346
 347   /* If the action has already finish perform the error handling, */
 348   /* otherwise set up a waiting timeout on the right side         */
 349   if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
 350     SIMIX_comm_finish(action);
 351   } 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 */
 352     sleep = surf_workstation_model->extension.workstation.sleep(req->issuer->smx_host->host, timeout);
 353     surf_workstation_model->action_data_set(sleep, action);
 354
 355     if (req->issuer == action->comm.src_proc)
 356       action->comm.src_timeout = sleep;
 357     else
 358       action->comm.dst_timeout = sleep;
 359   }
 360 }
 361
 362 void SIMIX_pre_comm_test(smx_req_t req)
 363 {
 364   smx_action_t action = req->comm_test.comm;
 365
 366   if(MC_IS_ENABLED){
 367     req->comm_test.result = action->comm.src_proc && action->comm.dst_proc;
 368     if(req->comm_test.result){
 369       action->state = SIMIX_DONE;
 370       xbt_fifo_push(action->request_list, req);
 371       SIMIX_comm_finish(action);
 372     }else{
 373       SIMIX_request_answer(req);
 374     }
 375     return;
 376   }
 377
 378   req->comm_test.result = (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING);
 379   if (req->comm_test.result) {
 380     xbt_fifo_push(action->request_list, req);
 381     SIMIX_comm_finish(action);
 382   } else {
 383     SIMIX_request_answer(req);
 384   }
 385 }
 386
 387 void SIMIX_pre_comm_testany(smx_req_t req, int idx)
 388 {
 389   unsigned int cursor;
 390   smx_action_t action;
 391   xbt_dynar_t actions = req->comm_testany.comms;
 392   req->comm_testany.result = -1;
 393
 394   if (MC_IS_ENABLED){
 395     if(idx == -1){
 396       SIMIX_request_answer(req);
 397     }else{
 398       action = xbt_dynar_get_as(actions, idx, smx_action_t);
 399       req->comm_testany.result = idx;
 400       xbt_fifo_push(action->request_list, req);
 401       action->state = SIMIX_DONE;
 402       SIMIX_comm_finish(action);
 403     }
 404     return;
 405   }
 406
 407   xbt_dynar_foreach(req->comm_testany.comms,cursor,action) {
 408     if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING) {
 409       req->comm_testany.result = cursor;
 410       xbt_fifo_push(action->request_list, req);
 411       SIMIX_comm_finish(action);
 412       return;
 413     }
 414   }
 415   SIMIX_request_answer(req);
 416 }
 417
 418 void SIMIX_pre_comm_waitany(smx_req_t req, int idx)
 419 {
 420   smx_action_t action;
 421   unsigned int cursor = 0;
 422   xbt_dynar_t actions = req->comm_waitany.comms;
 423
 424   if (MC_IS_ENABLED){
 425     action = xbt_dynar_get_as(actions, idx, smx_action_t);
 426     xbt_fifo_push(action->request_list, req);
 427     req->comm_waitany.result = idx;
 428     action->state = SIMIX_DONE;
 429     SIMIX_comm_finish(action);
 430     return;
 431   }
 432
 433   xbt_dynar_foreach(actions, cursor, action){
 434     /* Associate this request to the action */
 435     xbt_fifo_push(action->request_list, req);
 436     if (action->state != SIMIX_WAITING && action->state != SIMIX_RUNNING){
 437       SIMIX_comm_finish(action);
 438       break;
 439     }
 440   }
 441 }
 442
 443 void SIMIX_waitany_req_remove_from_actions(smx_req_t req)
 444 {
 445   smx_action_t action;
 446   unsigned int cursor = 0;
 447   xbt_dynar_t actions = req->comm_waitany.comms;
 448
 449   xbt_dynar_foreach(actions, cursor, action){
 450     xbt_fifo_remove(action->request_list, req);
 451   }
 452 }
 453
 454 /**
 455  *  \brief Start the simulation of a communication request
 456  *  \param action The communication action
 457  */
 458 static XBT_INLINE void SIMIX_comm_start(smx_action_t action)
 459 {
 460   /* If both the sender and the receiver are already there, start the communication */
 461   if (action->state == SIMIX_READY) {
 462     smx_host_t sender = action->comm.src_proc->smx_host;
 463     smx_host_t receiver = action->comm.dst_proc->smx_host;
 464
 465     DEBUG3("Starting communication %p from '%s' to '%s'", action,
 466            SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
 467
 468     action->comm.surf_comm = surf_workstation_model->extension.workstation.
 469         communicate(sender->host, receiver->host, action->comm.task_size, action->comm.rate);
 470
 471     surf_workstation_model->action_data_set(action->comm.surf_comm, action);
 472
 473     action->state = SIMIX_RUNNING;
 474
 475 #ifdef HAVE_TRACING
 476     TRACE_smx_action_communicate(action, action->comm.src_proc);
 477 #endif
 478
 479     /* If a link is failed, detect it immediately */
 480     if (surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED) {
 481       DEBUG2("Communication from '%s' to '%s' failed to start because of a link failure",
 482           SIMIX_host_get_name(sender), SIMIX_host_get_name(receiver));
 483       action->state = SIMIX_LINK_FAILURE;
 484       SIMIX_comm_destroy_internal_actions(action);
 485     }
 486
 487     /* If any of the process is suspend, create the action but stop its execution,
 488        it will be restarted when the sender process resume */
 489     if (SIMIX_process_is_suspended(action->comm.src_proc) ||
 490         SIMIX_process_is_suspended(action->comm.dst_proc)) {
 491       /* FIXME: check what should happen with the action state */
 492       surf_workstation_model->suspend(action->comm.surf_comm);
 493     }
 494   }
 495 }
 496
 497 void SIMIX_comm_finish(smx_action_t action)
 498 {
 499   smx_req_t req;
 500
 501   while ((req = xbt_fifo_shift(action->request_list))) {
 502
 503     /* If a waitany request is waiting for this action to finish, then remove
 504        it from the other actions in the waitany list. Afterwards, get the
 505        position of the actual action in the waitany request's actions dynar and
 506        return it as the result of the call */
 507     if (req->call == REQ_COMM_WAITANY) {
 508       SIMIX_waitany_req_remove_from_actions(req);
 509       if(!MC_IS_ENABLED)
 510         req->comm_waitany.result = xbt_dynar_search(req->comm_waitany.comms, &action);
 511     }
 512
 513     /* If the action is still in a rendez-vous point then remove from it */
 514     if (action->comm.rdv)
 515       SIMIX_rdv_remove(action->comm.rdv, action);
 516
 517     DEBUG1("SIMIX_comm_finish: action state = %d", action->state);
 518
 519     /* Check out for errors */
 520     switch (action->state) {
 521
 522       case SIMIX_DONE:
 523         DEBUG1("Communication %p complete!", action);
 524         SIMIX_comm_copy_data(action);
 525         break;
 526
 527       case SIMIX_SRC_TIMEOUT:
 528         TRY {
 529           THROW0(timeout_error, 0, "Communication timeouted because of sender");
 530         }
 531         CATCH(req->issuer->running_ctx->exception) {
 532           req->issuer->doexception = 1;
 533         }
 534         break;
 535
 536       case SIMIX_DST_TIMEOUT:
 537         TRY {
 538           THROW0(timeout_error, 0, "Communication timeouted because of receiver");
 539         }
 540         CATCH(req->issuer->running_ctx->exception) {
 541           req->issuer->doexception = 1;
 542         }
 543         break;
 544
 545       case SIMIX_SRC_HOST_FAILURE:
 546         TRY {
 547           if (req->issuer == action->comm.src_proc)
 548             THROW0(host_error, 0, "Host failed");
 549           else
 550             THROW0(network_error, 0, "Remote peer failed");
 551         }
 552         CATCH(req->issuer->running_ctx->exception) {
 553           req->issuer->doexception = 1;
 554         }
 555         break;
 556
 557       case SIMIX_DST_HOST_FAILURE:
 558         TRY {
 559           if (req->issuer == action->comm.dst_proc)
 560             THROW0(host_error, 0, "Host failed");
 561           else
 562             THROW0(network_error, 0, "Remote peer failed");
 563         }
 564         CATCH(req->issuer->running_ctx->exception) {
 565           req->issuer->doexception = 1;
 566         }
 567         break;
 568
 569       case SIMIX_LINK_FAILURE:
 570         TRY {
 571           DEBUG5("Link failure in action %p between '%s' and '%s': posting an exception to the issuer: %s (%p)",
 572               action, action->comm.src_proc->smx_host->name, action->comm.dst_proc->smx_host->name,
 573               req->issuer->name, req->issuer);
 574           THROW0(network_error, 0, "Link failure");
 575         }
 576         CATCH(req->issuer->running_ctx->exception) {
 577           req->issuer->doexception = 1;
 578         }
 579         break;
 580
 581       default:
 582         THROW_IMPOSSIBLE;
 583     }
 584
 585     /* if there is an exception during a waitany or a testany, indicate the position of the failed communication */
 586     if (req->issuer->doexception) {
 587       if (req->call == REQ_COMM_WAITANY) {
 588         req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_waitany.comms, &action);
 589       }
 590       else if (req->call == REQ_COMM_TESTANY) {
 591         req->issuer->running_ctx->exception.value = xbt_dynar_search(req->comm_testany.comms, &action);
 592       }
 593     }
 594
 595     req->issuer->waiting_action = NULL;
 596     SIMIX_request_answer(req);
 597   }
 598 }
 599
 600 void SIMIX_post_comm(smx_action_t action)
 601 {
 602   /* Update action state */
 603   if (action->comm.src_timeout &&
 604      surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_DONE)
 605      action->state = SIMIX_SRC_TIMEOUT;
 606   else if (action->comm.dst_timeout &&
 607           surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_DONE)
 608      action->state = SIMIX_DST_TIMEOUT;
 609   else if (action->comm.src_timeout &&
 610           surf_workstation_model->action_state_get(action->comm.src_timeout) == SURF_ACTION_FAILED)
 611      action->state = SIMIX_SRC_HOST_FAILURE;
 612   else if (action->comm.dst_timeout &&
 613           surf_workstation_model->action_state_get(action->comm.dst_timeout) == SURF_ACTION_FAILED)
 614      action->state = SIMIX_DST_HOST_FAILURE;
 615   else if (action->comm.surf_comm &&
 616           surf_workstation_model->action_state_get(action->comm.surf_comm) == SURF_ACTION_FAILED)
 617      action->state = SIMIX_LINK_FAILURE;
 618   else
 619     action->state = SIMIX_DONE;
 620
 621   DEBUG1("SIMIX_post_comm: action state = %d", action->state);
 622
 623   /* After this point the surf actions associated with the simix communicate
 624      action are no longer needed, thus we delete them. */
 625   SIMIX_comm_destroy_internal_actions(action);
 626
 627   /* If there are requests associated with the action, then answer them */
 628   if (xbt_fifo_size(action->request_list))
 629     SIMIX_comm_finish(action);
 630 }
 631
 632 void SIMIX_comm_cancel(smx_action_t action)
 633 {
 634   /* If the action is a waiting state means that it is still in a rdv */
 635   /* so remove from it and delete it */
 636   if (action->state == SIMIX_WAITING) {
 637     SIMIX_rdv_remove(action->comm.rdv, action);
 638     action->state = SIMIX_FAILED;
 639   } else {
 640     /* When running the MC there are no surf actions */
 641     if(!MC_IS_ENABLED)
 642       surf_workstation_model->action_cancel(action->comm.surf_comm);
 643   }
 644 }
 645
 646 void SIMIX_comm_suspend(smx_action_t action)
 647 {
 648   /*FIXME: shall we suspend also the timeout actions? */
 649   surf_workstation_model->suspend(action->comm.surf_comm);
 650 }
 651
 652 void SIMIX_comm_resume(smx_action_t action)
 653 {
 654   /*FIXME: check what happen with the timeouts */
 655   surf_workstation_model->resume(action->comm.surf_comm);
 656 }
 657
 658
 659 /************* Action Getters **************/
 660
 661 /**
 662  *  \brief get the amount remaining from the communication
 663  *  \param action The communication
 664  */
 665 double SIMIX_comm_get_remains(smx_action_t action)
 666 {
 667   double remains;
 668
 669   switch (action->state) {
 670
 671     case SIMIX_RUNNING:
 672       remains = surf_workstation_model->get_remains(action->comm.surf_comm);
 673       break;
 674
 675     case SIMIX_WAITING:
 676     case SIMIX_READY:
 677       remains = 0; /*FIXME: check what should be returned */
 678       break;
 679
 680     default:
 681       remains = 0; /*FIXME: is this correct? */
 682       break;
 683   }
 684   return remains;
 685 }
 686
 687 e_smx_state_t SIMIX_comm_get_state(smx_action_t action)
 688 {
 689   return action->state;
 690 }
 691
 692 /**
 693  *  \brief Return the user data associated to the sender of the communication
 694  *  \param action The communication
 695  *  \return the user data
 696  */
 697 void* SIMIX_comm_get_src_data(smx_action_t action)
 698 {
 699   return action->comm.src_data;
 700 }
 701
 702 /**
 703  *  \brief Return the user data associated to the receiver of the communication
 704  *  \param action The communication
 705  *  \return the user data
 706  */
 707 void* SIMIX_comm_get_dst_data(smx_action_t action)
 708 {
 709   return action->comm.dst_data;
 710 }
 711
 712 void* SIMIX_comm_get_src_buff(smx_action_t action)
 713 {
 714   return action->comm.src_buff;
 715 }
 716
 717 void* SIMIX_comm_get_dst_buff(smx_action_t action)
 718 {
 719   return action->comm.dst_buff;
 720 }
 721
 722 size_t SIMIX_comm_get_src_buff_size(smx_action_t action)
 723 {
 724   return action->comm.src_buff_size;
 725 }
 726
 727 size_t SIMIX_comm_get_dst_buff_size(smx_action_t action)
 728 {
 729   size_t buff_size;
 730
 731   if (action->comm.dst_buff_size)
 732     buff_size = *(action->comm.dst_buff_size);
 733   else
 734     buff_size = 0;
 735
 736   return buff_size;
 737 }
 738
 739 smx_process_t SIMIX_comm_get_src_proc(smx_action_t action)
 740 {
 741   return action->comm.src_proc;
 742 }
 743
 744 smx_process_t SIMIX_comm_get_dst_proc(smx_action_t action)
 745 {
 746   return action->comm.dst_proc;
 747 }
 748
 749 #ifdef HAVE_LATENCY_BOUND_TRACKING
 750 /**
 751  *  \brief verify if communication is latency bounded
 752  *  \param comm The communication
 753  */
 754 XBT_INLINE int SIMIX_comm_is_latency_bounded(smx_action_t action)
 755 {
 756   if (action->comm.surf_comm){
 757       DEBUG1("Getting latency limited for surf_action (%p)", action->comm.surf_comm);
 758       action->latency_limited = surf_workstation_model->get_latency_limited(action->comm.surf_comm);
 759       DEBUG1("Action limited is %d", action->latency_limited);
 760   }
 761   return action->latency_limited;
 762 }
 763 #endif
 764
 765 /******************************************************************************/
 766 /*                    SIMIX_comm_copy_data callbacks                       */
 767 /******************************************************************************/
 768 static void (*SIMIX_comm_copy_data_callback) (smx_action_t, size_t) =
 769     &SIMIX_comm_copy_pointer_callback;
 770
 771 void
 772 SIMIX_comm_set_copy_data_callback(void (*callback) (smx_action_t, size_t))
 773 {
 774   SIMIX_comm_copy_data_callback = callback;
 775 }
 776
 777 void SIMIX_comm_copy_pointer_callback(smx_action_t comm, size_t buff_size)
 778 {
 779   xbt_assert1((buff_size == sizeof(void *)),
 780               "Cannot copy %zu bytes: must be sizeof(void*)", buff_size);
 781   *(void **) (comm->comm.dst_buff) = comm->comm.src_buff;
 782 }
 783
 784 void SIMIX_comm_copy_buffer_callback(smx_action_t comm, size_t buff_size)
 785 {
 786   memcpy(comm->comm.dst_buff, comm->comm.src_buff, buff_size);
 787 }
 788
 789 /**
 790  *  \brief Copy the communication data from the sender's buffer to the receiver's one
 791  *  \param comm The communication
 792  */
 793 void SIMIX_comm_copy_data(smx_action_t comm)
 794 {
 795   size_t buff_size = comm->comm.src_buff_size;
 796   /* If there is no data to be copy then return */
 797   if (!comm->comm.src_buff || !comm->comm.dst_buff || comm->comm.copied == 1)
 798     return;
 799
 800   DEBUG6("Copying comm %p data from %s (%p) -> %s (%p) (%zu bytes)",
 801          comm,
 802          comm->comm.src_proc->smx_host->name, comm->comm.src_buff,
 803          comm->comm.dst_proc->smx_host->name, comm->comm.dst_buff, buff_size);
 804
 805   /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
 806   if (comm->comm.dst_buff_size)
 807     buff_size = MIN(buff_size, *(comm->comm.dst_buff_size));
 808
 809   /* Update the receiver's buffer size to the copied amount */
 810   if (comm->comm.dst_buff_size)
 811     *comm->comm.dst_buff_size = buff_size;
 812
 813   if (buff_size == 0)
 814     return;
 815
 816   (*SIMIX_comm_copy_data_callback) (comm, buff_size);
 817
 818   /* Set the copied flag so we copy data only once */
 819   /* (this function might be called from both communication ends) */
 820   comm->comm.copied = 1;
 821 }