src/kernel/activity/CommImpl.cpp

   1 /* Copyright (c) 2007-2020. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #include "src/kernel/activity/CommImpl.hpp"
   7 #include "simgrid/Exception.hpp"
   8 #include "simgrid/kernel/resource/Action.hpp"
   9 #include "simgrid/modelchecker.h"
  10 #include "simgrid/s4u/Host.hpp"
  11 #include "src/kernel/activity/MailboxImpl.hpp"
  12 #include "src/kernel/context/Context.hpp"
  13 #include "src/mc/mc_replay.hpp"
  14 #include "src/surf/cpu_interface.hpp"
  15 #include "src/surf/network_interface.hpp"
  16 #include "src/surf/surf_interface.hpp"
  17
  18 #include <boost/range/algorithm.hpp>
  19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_network, simix, "SIMIX network-related synchronization");
  20
  21 XBT_PRIVATE void simcall_HANDLER_comm_send(smx_simcall_t simcall, smx_actor_t src, smx_mailbox_t mbox, double task_size,
  22                                            double rate, unsigned char* src_buff, size_t src_buff_size,
  23                                            bool (*match_fun)(void*, void*, simgrid::kernel::activity::CommImpl*),
  24                                            void (*copy_data_fun)(simgrid::kernel::activity::CommImpl*, void*, size_t),
  25                                            void* data, double timeout)
  26 {
  27   smx_activity_t comm = simcall_HANDLER_comm_isend(simcall, src, mbox, task_size, rate, src_buff, src_buff_size,
  28                                                    match_fun, nullptr, copy_data_fun, data, 0);
  29   SIMCALL_SET_MC_VALUE(*simcall, 0);
  30   simcall_HANDLER_comm_wait(simcall, static_cast<simgrid::kernel::activity::CommImpl*>(comm.get()), timeout);
  31 }
  32
  33 XBT_PRIVATE smx_activity_t simcall_HANDLER_comm_isend(
  34     smx_simcall_t /*simcall*/, smx_actor_t src_proc, smx_mailbox_t mbox, double task_size, double rate,
  35     unsigned char* src_buff, size_t src_buff_size,
  36     bool (*match_fun)(void*, void*, simgrid::kernel::activity::CommImpl*),
  37     void (*clean_fun)(void*), // used to free the synchro in case of problem after a detached send
  38     void (*copy_data_fun)(simgrid::kernel::activity::CommImpl*, void*, size_t), // used to copy data if not default one
  39     void* data, bool detached)
  40 {
  41   XBT_DEBUG("send from mailbox %p", mbox);
  42
  43   /* Prepare a synchro describing us, so that it gets passed to the user-provided filter of other side */
  44   simgrid::kernel::activity::CommImplPtr this_comm =
  45       simgrid::kernel::activity::CommImplPtr(new simgrid::kernel::activity::CommImpl());
  46   this_comm->set_type(simgrid::kernel::activity::CommImpl::Type::SEND);
  47
  48   /* Look for communication synchro matching our needs. We also provide a description of
  49    * ourself so that the other side also gets a chance of choosing if it wants to match with us.
  50    *
  51    * If it is not found then push our communication into the rendez-vous point */
  52   simgrid::kernel::activity::CommImplPtr other_comm =
  53       mbox->find_matching_comm(simgrid::kernel::activity::CommImpl::Type::RECEIVE, match_fun, data, this_comm,
  54                                /*done*/ false, /*remove_matching*/ true);
  55
  56   if (not other_comm) {
  57     other_comm = std::move(this_comm);
  58
  59     if (mbox->permanent_receiver_ != nullptr) {
  60       // this mailbox is for small messages, which have to be sent right now
  61       other_comm->state_     = simgrid::kernel::activity::State::READY;
  62       other_comm->dst_actor_ = mbox->permanent_receiver_.get();
  63       mbox->done_comm_queue_.push_back(other_comm);
  64       XBT_DEBUG("pushing a message into the permanent receive list %p, comm %p", mbox, other_comm.get());
  65
  66     } else {
  67       mbox->push(other_comm);
  68     }
  69   } else {
  70     XBT_DEBUG("Receive already pushed");
  71
  72     other_comm->state_ = simgrid::kernel::activity::State::READY;
  73     other_comm->set_type(simgrid::kernel::activity::CommImpl::Type::READY);
  74   }
  75
  76   if (detached) {
  77     other_comm->detach();
  78     other_comm->clean_fun = clean_fun;
  79   } else {
  80     other_comm->clean_fun = nullptr;
  81     src_proc->comms.push_back(other_comm);
  82   }
  83
  84   /* Setup the communication synchro */
  85   other_comm->src_actor_     = src_proc;
  86   other_comm->src_data_      = data;
  87   (*other_comm).set_src_buff(src_buff, src_buff_size).set_size(task_size).set_rate(rate);
  88
  89   other_comm->match_fun     = match_fun;
  90   other_comm->copy_data_fun = copy_data_fun;
  91
  92   if (MC_is_active() || MC_record_replay_is_active())
  93     other_comm->state_ = simgrid::kernel::activity::State::RUNNING;
  94   else
  95     other_comm->start();
  96
  97   return (detached ? nullptr : other_comm);
  98 }
  99
 100 XBT_PRIVATE void simcall_HANDLER_comm_recv(smx_simcall_t simcall, smx_actor_t receiver, smx_mailbox_t mbox,
 101                                            unsigned char* dst_buff, size_t* dst_buff_size,
 102                                            bool (*match_fun)(void*, void*, simgrid::kernel::activity::CommImpl*),
 103                                            void (*copy_data_fun)(simgrid::kernel::activity::CommImpl*, void*, size_t),
 104                                            void* data, double timeout, double rate)
 105 {
 106   smx_activity_t comm = simcall_HANDLER_comm_irecv(simcall, receiver, mbox, dst_buff, dst_buff_size, match_fun,
 107                                                    copy_data_fun, data, rate);
 108   SIMCALL_SET_MC_VALUE(*simcall, 0);
 109   simcall_HANDLER_comm_wait(simcall, static_cast<simgrid::kernel::activity::CommImpl*>(comm.get()), timeout);
 110 }
 111
 112 XBT_PRIVATE smx_activity_t simcall_HANDLER_comm_irecv(
 113     smx_simcall_t /*simcall*/, smx_actor_t receiver, smx_mailbox_t mbox, unsigned char* dst_buff, size_t* dst_buff_size,
 114     bool (*match_fun)(void*, void*, simgrid::kernel::activity::CommImpl*),
 115     void (*copy_data_fun)(simgrid::kernel::activity::CommImpl*, void*, size_t), void* data, double rate)
 116 {
 117   simgrid::kernel::activity::CommImplPtr this_synchro =
 118       simgrid::kernel::activity::CommImplPtr(new simgrid::kernel::activity::CommImpl());
 119   this_synchro->set_type(simgrid::kernel::activity::CommImpl::Type::RECEIVE);
 120   XBT_DEBUG("recv from mbox %p. this_synchro=%p", mbox, this_synchro.get());
 121
 122   simgrid::kernel::activity::CommImplPtr other_comm;
 123   // communication already done, get it inside the list of completed comms
 124   if (mbox->permanent_receiver_ != nullptr && not mbox->done_comm_queue_.empty()) {
 125     XBT_DEBUG("We have a comm that has probably already been received, trying to match it, to skip the communication");
 126     // find a match in the list of already received comms
 127     other_comm = mbox->find_matching_comm(simgrid::kernel::activity::CommImpl::Type::SEND, match_fun, data,
 128                                           this_synchro, /*done*/ true,
 129                                           /*remove_matching*/ true);
 130     // if not found, assume the receiver came first, register it to the mailbox in the classical way
 131     if (not other_comm) {
 132       XBT_DEBUG("We have messages in the permanent receive list, but not the one we are looking for, pushing request "
 133                 "into list");
 134       other_comm = std::move(this_synchro);
 135       mbox->push(other_comm);
 136     } else {
 137       if (other_comm->surf_action_ && other_comm->get_remaining() < 1e-12) {
 138         XBT_DEBUG("comm %p has been already sent, and is finished, destroy it", other_comm.get());
 139         other_comm->state_ = simgrid::kernel::activity::State::DONE;
 140         other_comm->set_type(simgrid::kernel::activity::CommImpl::Type::DONE).set_mailbox(nullptr);
 141       }
 142     }
 143   } else {
 144     /* Prepare a comm describing us, so that it gets passed to the user-provided filter of other side */
 145
 146     /* Look for communication activity matching our needs. We also provide a description of
 147      * ourself so that the other side also gets a chance of choosing if it wants to match with us.
 148      *
 149      * If it is not found then push our communication into the rendez-vous point */
 150     other_comm = mbox->find_matching_comm(simgrid::kernel::activity::CommImpl::Type::SEND, match_fun, data,
 151                                           this_synchro, /*done*/ false,
 152                                           /*remove_matching*/ true);
 153
 154     if (other_comm == nullptr) {
 155       XBT_DEBUG("Receive pushed first (%zu comm enqueued so far)", mbox->comm_queue_.size());
 156       other_comm = std::move(this_synchro);
 157       mbox->push(other_comm);
 158     } else {
 159       XBT_DEBUG("Match my %p with the existing %p", this_synchro.get(), other_comm.get());
 160
 161       other_comm->state_ = simgrid::kernel::activity::State::READY;
 162       other_comm->set_type(simgrid::kernel::activity::CommImpl::Type::READY);
 163     }
 164     receiver->comms.push_back(other_comm);
 165   }
 166
 167   /* Setup communication synchro */
 168   other_comm->dst_actor_     = receiver;
 169   other_comm->dst_data_      = data;
 170   other_comm->set_dst_buff(dst_buff, dst_buff_size);
 171
 172   if (rate > -1.0 && (other_comm->get_rate() < 0.0 || rate < other_comm->get_rate()))
 173     other_comm->set_rate(rate);
 174
 175   other_comm->match_fun     = match_fun;
 176   other_comm->copy_data_fun = copy_data_fun;
 177
 178   if (MC_is_active() || MC_record_replay_is_active()) {
 179     other_comm->state_ = simgrid::kernel::activity::State::RUNNING;
 180     return other_comm;
 181   }
 182   other_comm->start();
 183   return other_comm;
 184 }
 185
 186 void simcall_HANDLER_comm_wait(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl* comm, double timeout)
 187 {
 188   /* Associate this simcall to the wait synchro */
 189   XBT_DEBUG("simcall_HANDLER_comm_wait, %p", comm);
 190
 191   comm->register_simcall(simcall);
 192
 193   if (MC_is_active() || MC_record_replay_is_active()) {
 194     int idx = SIMCALL_GET_MC_VALUE(*simcall);
 195     if (idx == 0) {
 196       comm->state_ = simgrid::kernel::activity::State::DONE;
 197     } else {
 198       /* If we reached this point, the wait simcall must have a timeout */
 199       /* Otherwise it shouldn't be enabled and executed by the MC */
 200       if (timeout < 0.0)
 201         THROW_IMPOSSIBLE;
 202
 203       if (comm->src_actor_ == simcall->issuer_)
 204         comm->state_ = simgrid::kernel::activity::State::SRC_TIMEOUT;
 205       else
 206         comm->state_ = simgrid::kernel::activity::State::DST_TIMEOUT;
 207     }
 208
 209     comm->finish();
 210     return;
 211   }
 212
 213   /* If the synchro has already finish perform the error handling, */
 214   /* otherwise set up a waiting timeout on the right side          */
 215   if (comm->state_ != simgrid::kernel::activity::State::WAITING &&
 216       comm->state_ != simgrid::kernel::activity::State::RUNNING) {
 217     comm->finish();
 218   } else { /* we need a sleep action (even when there is no timeout) to be notified of host failures */
 219     simgrid::kernel::resource::Action* sleep = simcall->issuer_->get_host()->pimpl_cpu->sleep(timeout);
 220     sleep->set_activity(comm);
 221
 222     if (simcall->issuer_ == comm->src_actor_)
 223       comm->src_timeout_ = sleep;
 224     else
 225       comm->dst_timeout_ = sleep;
 226   }
 227 }
 228
 229 void simcall_HANDLER_comm_test(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl* comm)
 230 {
 231   bool res;
 232
 233   if (MC_is_active() || MC_record_replay_is_active()) {
 234     res = comm->src_actor_ && comm->dst_actor_;
 235     if (res)
 236       comm->state_ = simgrid::kernel::activity::State::DONE;
 237   } else {
 238     res = comm->state_ != simgrid::kernel::activity::State::WAITING &&
 239           comm->state_ != simgrid::kernel::activity::State::RUNNING;
 240   }
 241
 242   simcall_comm_test__set__result(simcall, res);
 243   if (res) {
 244     comm->simcalls_.push_back(simcall);
 245     comm->finish();
 246   } else {
 247     simcall->issuer_->simcall_answer();
 248   }
 249 }
 250
 251 void simcall_HANDLER_comm_testany(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl* comms[], size_t count)
 252 {
 253   // The default result is -1 -- this means, "nothing is ready".
 254   // It can be changed below, but only if something matches.
 255   simcall_comm_testany__set__result(simcall, -1);
 256
 257   if (MC_is_active() || MC_record_replay_is_active()) {
 258     int idx = SIMCALL_GET_MC_VALUE(*simcall);
 259     if (idx == -1) {
 260       simcall->issuer_->simcall_answer();
 261     } else {
 262       simgrid::kernel::activity::CommImpl* comm = comms[idx];
 263       simcall_comm_testany__set__result(simcall, idx);
 264       comm->simcalls_.push_back(simcall);
 265       comm->state_ = simgrid::kernel::activity::State::DONE;
 266       comm->finish();
 267     }
 268     return;
 269   }
 270
 271   for (std::size_t i = 0; i != count; ++i) {
 272     simgrid::kernel::activity::CommImpl* comm = comms[i];
 273     if (comm->state_ != simgrid::kernel::activity::State::WAITING &&
 274         comm->state_ != simgrid::kernel::activity::State::RUNNING) {
 275       simcall_comm_testany__set__result(simcall, i);
 276       comm->simcalls_.push_back(simcall);
 277       comm->finish();
 278       return;
 279     }
 280   }
 281   simcall->issuer_->simcall_answer();
 282 }
 283
 284 static void SIMIX_waitany_remove_simcall_from_actions(smx_simcall_t simcall)
 285 {
 286   simgrid::kernel::activity::CommImpl** comms = simcall_comm_waitany__get__comms(simcall);
 287   size_t count                                = simcall_comm_waitany__get__count(simcall);
 288
 289   for (size_t i = 0; i < count; i++) {
 290     // Remove the first occurrence of simcall:
 291     auto* comm = comms[i];
 292     auto j     = boost::range::find(comm->simcalls_, simcall);
 293     if (j != comm->simcalls_.end())
 294       comm->simcalls_.erase(j);
 295   }
 296 }
 297 void simcall_HANDLER_comm_waitany(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl* comms[], size_t count,
 298                                   double timeout)
 299 {
 300   if (MC_is_active() || MC_record_replay_is_active()) {
 301     if (timeout > 0.0)
 302       xbt_die("Timeout not implemented for waitany in the model-checker");
 303     int idx                 = SIMCALL_GET_MC_VALUE(*simcall);
 304     auto* comm              = comms[idx];
 305     comm->simcalls_.push_back(simcall);
 306     simcall_comm_waitany__set__result(simcall, idx);
 307     comm->state_ = simgrid::kernel::activity::State::DONE;
 308     comm->finish();
 309     return;
 310   }
 311
 312   if (timeout < 0.0) {
 313     simcall->timeout_cb_ = NULL;
 314   } else {
 315     simcall->timeout_cb_ = simgrid::simix::Timer::set(SIMIX_get_clock() + timeout, [simcall]() {
 316       SIMIX_waitany_remove_simcall_from_actions(simcall);
 317       simcall_comm_waitany__set__result(simcall, -1);
 318       simcall->issuer_->simcall_answer();
 319     });
 320   }
 321
 322   for (size_t i = 0; i < count; i++) {
 323     /* associate this simcall to the the synchro */
 324     auto* comm = comms[i];
 325     comm->simcalls_.push_back(simcall);
 326
 327     /* see if the synchro is already finished */
 328     if (comm->state_ != simgrid::kernel::activity::State::WAITING &&
 329         comm->state_ != simgrid::kernel::activity::State::RUNNING) {
 330       comm->finish();
 331       break;
 332     }
 333   }
 334 }
 335
 336 /******************************************************************************/
 337 /*                    SIMIX_comm_copy_data callbacks                       */
 338 /******************************************************************************/
 339 static void (*SIMIX_comm_copy_data_callback)(simgrid::kernel::activity::CommImpl*, void*,
 340                                              size_t) = &SIMIX_comm_copy_pointer_callback;
 341
 342 void SIMIX_comm_copy_buffer_callback(simgrid::kernel::activity::CommImpl* comm, void* buff, size_t buff_size)
 343 {
 344   XBT_DEBUG("Copy the data over");
 345   memcpy(comm->dst_buff_, buff, buff_size);
 346   if (comm->detached()) { // if this is a detached send, the source buffer was duplicated by SMPI sender to make the
 347                           // original buffer available to the application ASAP
 348     xbt_free(buff);
 349     comm->src_buff_ = nullptr;
 350   }
 351 }
 352
 353 void SIMIX_comm_set_copy_data_callback(void (*callback)(simgrid::kernel::activity::CommImpl*, void*, size_t))
 354 {
 355   SIMIX_comm_copy_data_callback = callback;
 356 }
 357
 358 void SIMIX_comm_copy_pointer_callback(simgrid::kernel::activity::CommImpl* comm, void* buff, size_t buff_size)
 359 {
 360   xbt_assert((buff_size == sizeof(void*)), "Cannot copy %zu bytes: must be sizeof(void*)", buff_size);
 361   *(void**)(comm->dst_buff_) = buff;
 362 }
 363
 364 namespace simgrid {
 365 namespace kernel {
 366 namespace activity {
 367
 368 CommImpl& CommImpl::set_type(CommImpl::Type type)
 369 {
 370   type_ = type;
 371   return *this;
 372 }
 373
 374 CommImpl& CommImpl::set_size(double size)
 375 {
 376   size_ = size;
 377   return *this;
 378 }
 379
 380 CommImpl& CommImpl::set_rate(double rate)
 381 {
 382   rate_ = rate;
 383   return *this;
 384 }
 385 CommImpl& CommImpl::set_mailbox(MailboxImpl* mbox)
 386 {
 387   mbox_ = mbox;
 388   return *this;
 389 }
 390
 391 CommImpl& CommImpl::set_src_buff(unsigned char* buff, size_t size)
 392 {
 393   src_buff_      = buff;
 394   src_buff_size_ = size;
 395   return *this;
 396 }
 397
 398 CommImpl& CommImpl::set_dst_buff(unsigned char* buff, size_t* size)
 399 {
 400   dst_buff_      = buff;
 401   dst_buff_size_ = size;
 402   return *this;
 403 }
 404
 405 CommImpl& CommImpl::detach()
 406 {
 407   detached_ = true;
 408   return *this;
 409 }
 410
 411 CommImpl::~CommImpl()
 412 {
 413   XBT_DEBUG("Really free communication %p in state %d (detached = %d)", this, static_cast<int>(state_), detached_);
 414
 415   cleanupSurf();
 416
 417   if (detached_ && state_ != State::DONE) {
 418     /* the communication has failed and was detached:
 419      * we have to free the buffer */
 420     if (clean_fun)
 421       clean_fun(src_buff_);
 422     src_buff_ = nullptr;
 423   } else if (mbox_) {
 424     mbox_->remove(this);
 425   }
 426 }
 427
 428 /**  @brief Starts the simulation of a communication synchro. */
 429 CommImpl* CommImpl::start()
 430 {
 431   /* If both the sender and the receiver are already there, start the communication */
 432   if (state_ == State::READY) {
 433     s4u::Host* sender   = src_actor_->get_host();
 434     s4u::Host* receiver = dst_actor_->get_host();
 435
 436     surf_action_ = surf_network_model->communicate(sender, receiver, size_, rate_);
 437     surf_action_->set_activity(this);
 438     surf_action_->set_category(get_tracing_category());
 439     state_ = State::RUNNING;
 440
 441     XBT_DEBUG("Starting communication %p from '%s' to '%s' (surf_action: %p)", this, sender->get_cname(),
 442               receiver->get_cname(), surf_action_);
 443
 444     /* If a link is failed, detect it immediately */
 445     if (surf_action_->get_state() == resource::Action::State::FAILED) {
 446       XBT_DEBUG("Communication from '%s' to '%s' failed to start because of a link failure", sender->get_cname(),
 447                 receiver->get_cname());
 448       state_ = State::LINK_FAILURE;
 449       post();
 450
 451     } else if (src_actor_->is_suspended() || dst_actor_->is_suspended()) {
 452       /* If any of the process is suspended, create the synchro but stop its execution,
 453          it will be restarted when the sender process resume */
 454       if (src_actor_->is_suspended())
 455         XBT_DEBUG("The communication is suspended on startup because src (%s@%s) was suspended since it initiated the "
 456                   "communication",
 457                   src_actor_->get_cname(), src_actor_->get_host()->get_cname());
 458       else
 459         XBT_DEBUG("The communication is suspended on startup because dst (%s@%s) was suspended since it initiated the "
 460                   "communication",
 461                   dst_actor_->get_cname(), dst_actor_->get_host()->get_cname());
 462
 463       surf_action_->suspend();
 464     }
 465   }
 466
 467   return this;
 468 }
 469
 470 /** @brief Copy the communication data from the sender's buffer to the receiver's one  */
 471 void CommImpl::copy_data()
 472 {
 473   size_t buff_size = src_buff_size_;
 474   /* If there is no data to copy then return */
 475   if (not src_buff_ || not dst_buff_ || copied_)
 476     return;
 477
 478   XBT_DEBUG("Copying comm %p data from %s (%p) -> %s (%p) (%zu bytes)", this,
 479             src_actor_ ? src_actor_->get_host()->get_cname() : "a finished process", src_buff_,
 480             dst_actor_ ? dst_actor_->get_host()->get_cname() : "a finished process", dst_buff_, buff_size);
 481
 482   /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
 483   if (dst_buff_size_)
 484     buff_size = std::min(buff_size, *(dst_buff_size_));
 485
 486   /* Update the receiver's buffer size to the copied amount */
 487   if (dst_buff_size_)
 488     *dst_buff_size_ = buff_size;
 489
 490   if (buff_size > 0) {
 491     if (copy_data_fun)
 492       copy_data_fun(this, src_buff_, buff_size);
 493     else
 494       SIMIX_comm_copy_data_callback(this, src_buff_, buff_size);
 495   }
 496
 497   /* Set the copied flag so we copy data only once */
 498   /* (this function might be called from both communication ends) */
 499   copied_ = true;
 500 }
 501
 502 void CommImpl::suspend()
 503 {
 504   /* FIXME: shall we suspend also the timeout synchro? */
 505   if (surf_action_)
 506     surf_action_->suspend();
 507   /* if not created yet, the action will be suspended on creation, in CommImpl::start() */
 508 }
 509
 510 void CommImpl::resume()
 511 {
 512   /*FIXME: check what happen with the timeouts */
 513   if (surf_action_)
 514     surf_action_->resume();
 515   /* in the other case, the synchro were not really suspended yet, see CommImpl::suspend() and CommImpl::start() */
 516 }
 517
 518 void CommImpl::cancel()
 519 {
 520   /* if the synchro is a waiting state means that it is still in a mbox so remove from it and delete it */
 521   if (state_ == State::WAITING) {
 522     if (not detached_) {
 523       mbox_->remove(this);
 524       state_ = State::CANCELED;
 525     }
 526   } else if (not MC_is_active() /* when running the MC there are no surf actions */
 527              && not MC_record_replay_is_active() && (state_ == State::READY || state_ == State::RUNNING)) {
 528     surf_action_->cancel();
 529   }
 530 }
 531
 532 /** @brief This is part of the cleanup process, probably an internal command */
 533 void CommImpl::cleanupSurf()
 534 {
 535   clean_action();
 536
 537   if (src_timeout_) {
 538     src_timeout_->unref();
 539     src_timeout_ = nullptr;
 540   }
 541
 542   if (dst_timeout_) {
 543     dst_timeout_->unref();
 544     dst_timeout_ = nullptr;
 545   }
 546 }
 547
 548 void CommImpl::post()
 549 {
 550   /* Update synchro state */
 551   if (src_timeout_ && src_timeout_->get_state() == resource::Action::State::FINISHED)
 552     state_ = State::SRC_TIMEOUT;
 553   else if (dst_timeout_ && dst_timeout_->get_state() == resource::Action::State::FINISHED)
 554     state_ = State::DST_TIMEOUT;
 555   else if (src_timeout_ && src_timeout_->get_state() == resource::Action::State::FAILED)
 556     state_ = State::SRC_HOST_FAILURE;
 557   else if (dst_timeout_ && dst_timeout_->get_state() == resource::Action::State::FAILED)
 558     state_ = State::DST_HOST_FAILURE;
 559   else if (surf_action_ && surf_action_->get_state() == resource::Action::State::FAILED) {
 560     state_ = State::LINK_FAILURE;
 561   } else
 562     state_ = State::DONE;
 563
 564   XBT_DEBUG("SIMIX_post_comm: comm %p, state %d, src_proc %p, dst_proc %p, detached: %d", this, (int)state_,
 565             src_actor_.get(), dst_actor_.get(), detached_);
 566
 567   /* destroy the surf actions associated with the Simix communication */
 568   cleanupSurf();
 569
 570   /* Answer all simcalls associated with the synchro */
 571   finish();
 572 }
 573
 574 void CommImpl::finish()
 575 {
 576   while (not simcalls_.empty()) {
 577     smx_simcall_t simcall = simcalls_.front();
 578     simcalls_.pop_front();
 579
 580     /* If a waitany simcall is waiting for this synchro to finish, then remove it from the other synchros in the waitany
 581      * list. Afterwards, get the position of the actual synchro in the waitany list and return it as the result of the
 582      * simcall */
 583
 584     if (simcall->call_ == SIMCALL_NONE) // FIXME: maybe a better way to handle this case
 585       continue;                         // if actor handling comm is killed
 586     if (simcall->call_ == SIMCALL_COMM_WAITANY) {
 587       SIMIX_waitany_remove_simcall_from_actions(simcall);
 588       if (simcall->timeout_cb_) {
 589         simcall->timeout_cb_->remove();
 590         simcall->timeout_cb_ = nullptr;
 591       }
 592       if (not MC_is_active() && not MC_record_replay_is_active()) {
 593         CommImpl** comms   = simcall_comm_waitany__get__comms(simcall);
 594         size_t count       = simcall_comm_waitany__get__count(simcall);
 595         CommImpl** element = std::find(comms, comms + count, this);
 596         int rank           = (element != comms + count) ? element - comms : -1;
 597         simcall_comm_waitany__set__result(simcall, rank);
 598       }
 599     }
 600
 601     /* If the synchro is still in a rendez-vous point then remove from it */
 602     if (mbox_)
 603       mbox_->remove(this);
 604
 605     XBT_DEBUG("CommImpl::finish(): synchro state = %d", static_cast<int>(state_));
 606
 607     /* Check out for errors */
 608
 609     if (not simcall->issuer_->get_host()->is_on()) {
 610       simcall->issuer_->context_->iwannadie = true;
 611     } else {
 612       switch (state_) {
 613         case State::DONE:
 614           XBT_DEBUG("Communication %p complete!", this);
 615           copy_data();
 616           break;
 617
 618         case State::SRC_TIMEOUT:
 619           simcall->issuer_->exception_ = std::make_exception_ptr(
 620               simgrid::TimeoutException(XBT_THROW_POINT, "Communication timeouted because of the sender"));
 621           break;
 622
 623         case State::DST_TIMEOUT:
 624           simcall->issuer_->exception_ = std::make_exception_ptr(
 625               simgrid::TimeoutException(XBT_THROW_POINT, "Communication timeouted because of the receiver"));
 626           break;
 627
 628         case State::SRC_HOST_FAILURE:
 629           if (simcall->issuer_ == src_actor_)
 630             simcall->issuer_->context_->iwannadie = true;
 631           else
 632             simcall->issuer_->exception_ =
 633                 std::make_exception_ptr(simgrid::NetworkFailureException(XBT_THROW_POINT, "Remote peer failed"));
 634           break;
 635
 636         case State::DST_HOST_FAILURE:
 637           if (simcall->issuer_ == dst_actor_)
 638             simcall->issuer_->context_->iwannadie = true;
 639           else
 640             simcall->issuer_->exception_ =
 641                 std::make_exception_ptr(simgrid::NetworkFailureException(XBT_THROW_POINT, "Remote peer failed"));
 642           break;
 643
 644         case State::LINK_FAILURE:
 645           XBT_DEBUG("Link failure in synchro %p between '%s' and '%s': posting an exception to the issuer: %s (%p) "
 646                     "detached:%d",
 647                     this, src_actor_ ? src_actor_->get_host()->get_cname() : nullptr,
 648                     dst_actor_ ? dst_actor_->get_host()->get_cname() : nullptr, simcall->issuer_->get_cname(),
 649                     simcall->issuer_, detached_);
 650           if (src_actor_ == simcall->issuer_) {
 651             XBT_DEBUG("I'm source");
 652           } else if (dst_actor_ == simcall->issuer_) {
 653             XBT_DEBUG("I'm dest");
 654           } else {
 655             XBT_DEBUG("I'm neither source nor dest");
 656           }
 657           simcall->issuer_->throw_exception(
 658               std::make_exception_ptr(simgrid::NetworkFailureException(XBT_THROW_POINT, "Link failure")));
 659           break;
 660
 661         case State::CANCELED:
 662           if (simcall->issuer_ == dst_actor_)
 663             simcall->issuer_->exception_ = std::make_exception_ptr(
 664                 simgrid::CancelException(XBT_THROW_POINT, "Communication canceled by the sender"));
 665           else
 666             simcall->issuer_->exception_ = std::make_exception_ptr(
 667                 simgrid::CancelException(XBT_THROW_POINT, "Communication canceled by the receiver"));
 668           break;
 669
 670         default:
 671           xbt_die("Unexpected synchro state in CommImpl::finish: %d", static_cast<int>(state_));
 672       }
 673       simcall->issuer_->simcall_answer();
 674     }
 675     /* if there is an exception during a waitany or a testany, indicate the position of the failed communication */
 676     if (simcall->issuer_->exception_ &&
 677         (simcall->call_ == SIMCALL_COMM_WAITANY || simcall->call_ == SIMCALL_COMM_TESTANY)) {
 678       // First retrieve the rank of our failing synchro
 679       CommImpl** comms;
 680       size_t count;
 681       if (simcall->call_ == SIMCALL_COMM_WAITANY) {
 682         comms = simcall_comm_waitany__get__comms(simcall);
 683         count = simcall_comm_waitany__get__count(simcall);
 684       } else {
 685         /* simcall->call_ == SIMCALL_COMM_TESTANY */
 686         comms = simcall_comm_testany__get__comms(simcall);
 687         count = simcall_comm_testany__get__count(simcall);
 688       }
 689       CommImpl** element = std::find(comms, comms + count, this);
 690       int rank           = (element != comms + count) ? element - comms : -1;
 691
 692       // In order to modify the exception we have to rethrow it:
 693       try {
 694         std::rethrow_exception(simcall->issuer_->exception_);
 695       } catch (simgrid::Exception& e) {
 696         e.value = rank;
 697       }
 698     }
 699
 700     simcall->issuer_->waiting_synchro = nullptr;
 701     simcall->issuer_->comms.remove(this);
 702     if (detached_) {
 703       if (simcall->issuer_ == src_actor_) {
 704         if (dst_actor_)
 705           dst_actor_->comms.remove(this);
 706       } else if (simcall->issuer_ == dst_actor_) {
 707         if (src_actor_)
 708           src_actor_->comms.remove(this);
 709       } else {
 710         dst_actor_->comms.remove(this);
 711         src_actor_->comms.remove(this);
 712       }
 713     }
 714   }
 715 }
 716
 717 } // namespace activity
 718 } // namespace kernel
 719 } // namespace simgrid