src/s4u/s4u_Comm.cpp

   1 /* Copyright (c) 2006-2018. 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/msg/msg_private.hpp"
   7 #include "xbt/log.h"
   8
   9 #include "simgrid/s4u/Comm.hpp"
  10 #include "simgrid/s4u/Mailbox.hpp"
  11
  12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(s4u_comm, s4u_activity, "S4U asynchronous communications");
  13
  14 namespace simgrid {
  15 namespace s4u {
  16 simgrid::xbt::signal<void(simgrid::s4u::ActorPtr)> s4u::Comm::on_sender_start;
  17 simgrid::xbt::signal<void(simgrid::s4u::ActorPtr)> s4u::Comm::on_receiver_start;
  18 simgrid::xbt::signal<void(simgrid::s4u::ActorPtr)> s4u::Comm::on_completion;
  19
  20 Comm::~Comm()
  21 {
  22   if (state_ == State::STARTED && not detached_ && (pimpl_ == nullptr || pimpl_->state_ == SIMIX_RUNNING)) {
  23     XBT_INFO("Comm %p freed before its completion. Detached: %d, State: %d", this, detached_, (int)state_);
  24     if (pimpl_ != nullptr)
  25       XBT_INFO("pimpl_->state: %d", pimpl_->state_);
  26     else
  27       XBT_INFO("pimpl_ is null");
  28     xbt_backtrace_display_current();
  29   }
  30 }
  31
  32 int Comm::wait_any_for(std::vector<CommPtr>* comms_in, double timeout)
  33 {
  34   // Map to dynar<Synchro*>:
  35   xbt_dynar_t comms = xbt_dynar_new(sizeof(simgrid::kernel::activity::ActivityImpl*), [](void* ptr) {
  36     intrusive_ptr_release(*(simgrid::kernel::activity::ActivityImpl**)ptr);
  37   });
  38   for (auto const& comm : *comms_in) {
  39     if (comm->state_ == Activity::State::INITED)
  40       comm->start();
  41     xbt_assert(comm->state_ == Activity::State::STARTED);
  42     simgrid::kernel::activity::ActivityImpl* ptr = comm->pimpl_.get();
  43     intrusive_ptr_add_ref(ptr);
  44     xbt_dynar_push_as(comms, simgrid::kernel::activity::ActivityImpl*, ptr);
  45   }
  46   // Call the underlying simcall:
  47   int idx = simcall_comm_waitany(comms, timeout);
  48   xbt_dynar_free(&comms);
  49   return idx;
  50 }
  51
  52 void Comm::wait_all(std::vector<CommPtr>* comms)
  53 {
  54   // TODO: this should be a simcall or something
  55   // TODO: we are missing a version with timeout
  56   for (CommPtr comm : *comms)
  57     comm->wait();
  58 }
  59
  60 Activity* Comm::set_rate(double rate)
  61 {
  62   xbt_assert(state_ == State::INITED);
  63   rate_ = rate;
  64   return this;
  65 }
  66
  67 Activity* Comm::set_src_data(void* buff)
  68 {
  69   xbt_assert(state_ == State::INITED);
  70   xbt_assert(dst_buff_ == nullptr, "Cannot set the src and dst buffers at the same time");
  71   src_buff_ = buff;
  72   return this;
  73 }
  74 Activity* Comm::set_src_data_size(size_t size)
  75 {
  76   xbt_assert(state_ == State::INITED);
  77   src_buff_size_ = size;
  78   return this;
  79 }
  80 Activity* Comm::set_src_data(void* buff, size_t size)
  81 {
  82   xbt_assert(state_ == State::INITED);
  83
  84   xbt_assert(dst_buff_ == nullptr, "Cannot set the src and dst buffers at the same time");
  85   src_buff_      = buff;
  86   src_buff_size_ = size;
  87   return this;
  88 }
  89 Activity* Comm::set_dst_data(void** buff)
  90 {
  91   xbt_assert(state_ == State::INITED);
  92   xbt_assert(src_buff_ == nullptr, "Cannot set the src and dst buffers at the same time");
  93   dst_buff_ = buff;
  94   return this;
  95 }
  96 size_t Comm::get_dst_data_size()
  97 {
  98   xbt_assert(state_ == State::FINISHED);
  99   return dst_buff_size_;
 100 }
 101 Activity* Comm::set_dst_data(void** buff, size_t size)
 102 {
 103   xbt_assert(state_ == State::INITED);
 104
 105   xbt_assert(src_buff_ == nullptr, "Cannot set the src and dst buffers at the same time");
 106   dst_buff_      = buff;
 107   dst_buff_size_ = size;
 108   return this;
 109 }
 110
 111 Activity* Comm::start()
 112 {
 113   xbt_assert(state_ == State::INITED);
 114
 115   if (src_buff_ != nullptr) { // Sender side
 116     on_sender_start(Actor::self());
 117     pimpl_ = simcall_comm_isend(sender_, mailbox_->get_impl(), remains_, rate_, src_buff_, src_buff_size_, match_fun_,
 118                                 clean_fun_, copy_data_function_, user_data_, detached_);
 119   } else if (dst_buff_ != nullptr) { // Receiver side
 120     xbt_assert(not detached_, "Receive cannot be detached");
 121     on_receiver_start(Actor::self());
 122     pimpl_ = simcall_comm_irecv(receiver_, mailbox_->get_impl(), dst_buff_, &dst_buff_size_, match_fun_,
 123                                 copy_data_function_, user_data_, rate_);
 124
 125   } else {
 126     xbt_die("Cannot start a communication before specifying whether we are the sender or the receiver");
 127   }
 128   state_ = State::STARTED;
 129   return this;
 130 }
 131
 132 /** @brief Block the calling actor until the communication is finished */
 133 Activity* Comm::wait()
 134 {
 135   return this->wait_for(-1);
 136 }
 137
 138 /** @brief Block the calling actor until the communication is finished, or until timeout
 139  *
 140  * On timeout, an exception is thrown.
 141  *
 142  * @param timeout the amount of seconds to wait for the comm termination.
 143  *                Negative values denote infinite wait times. 0 as a timeout returns immediately. */
 144 Activity* Comm::wait_for(double timeout)
 145 {
 146   switch (state_) {
 147     case State::FINISHED:
 148       return this;
 149
 150     case State::INITED: // It's not started yet. Do it in one simcall
 151       if (src_buff_ != nullptr) {
 152         on_sender_start(Actor::self());
 153         simcall_comm_send(sender_, mailbox_->get_impl(), remains_, rate_, src_buff_, src_buff_size_, match_fun_,
 154                           copy_data_function_, user_data_, timeout);
 155
 156       } else { // Receiver
 157         on_receiver_start(Actor::self());
 158         simcall_comm_recv(receiver_, mailbox_->get_impl(), dst_buff_, &dst_buff_size_, match_fun_, copy_data_function_,
 159                           user_data_, timeout, rate_);
 160       }
 161       state_ = State::FINISHED;
 162       return this;
 163
 164     case State::STARTED:
 165       simcall_comm_wait(pimpl_, timeout);
 166       on_completion(Actor::self());
 167       state_ = State::FINISHED;
 168       return this;
 169
 170     default:
 171       THROW_IMPOSSIBLE;
 172   }
 173   return this;
 174 }
 175 int Comm::test_any(std::vector<CommPtr>* comms)
 176 {
 177   smx_activity_t* array = new smx_activity_t[comms->size()];
 178   for (unsigned int i = 0; i < comms->size(); i++) {
 179     array[i] = comms->at(i)->pimpl_;
 180   }
 181   int res = simcall_comm_testany(array, comms->size());
 182   delete[] array;
 183   return res;
 184 }
 185
 186 Activity* Comm::detach()
 187 {
 188   xbt_assert(state_ == State::INITED, "You cannot detach communications once they are started (not implemented).");
 189   xbt_assert(src_buff_ != nullptr && src_buff_size_ != 0, "You can only detach sends, not recvs");
 190   detached_ = true;
 191   return start();
 192 }
 193
 194 Activity* Comm::cancel()
 195 {
 196   simgrid::simix::simcall([this] { dynamic_cast<kernel::activity::CommImpl*>(pimpl_.get())->cancel(); });
 197   state_ = State::CANCELED;
 198   return this;
 199 }
 200
 201 bool Comm::test()
 202 {
 203   xbt_assert(state_ == State::INITED || state_ == State::STARTED || state_ == State::FINISHED);
 204
 205   if (state_ == State::FINISHED)
 206     return true;
 207
 208   if (state_ == State::INITED)
 209     this->start();
 210
 211   if (simcall_comm_test(pimpl_)) {
 212     state_ = State::FINISHED;
 213     return true;
 214   }
 215   return false;
 216 }
 217
 218 MailboxPtr Comm::get_mailbox()
 219 {
 220   return mailbox_;
 221 }
 222
 223 void intrusive_ptr_release(simgrid::s4u::Comm* c)
 224 {
 225   if (c->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
 226     std::atomic_thread_fence(std::memory_order_acquire);
 227     delete c;
 228   }
 229 }
 230 void intrusive_ptr_add_ref(simgrid::s4u::Comm* c)
 231 {
 232   c->refcount_.fetch_add(1, std::memory_order_relaxed);
 233 }
 234 } // namespace s4u
 235 } // namespace simgrid