src/kernel/activity/IoImpl.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 #include "src/kernel/activity/IoImpl.hpp"
   6 #include "mc/mc.h"
   7 #include "simgrid/Exception.hpp"
   8 #include "simgrid/kernel/resource/Action.hpp"
   9 #include "simgrid/s4u/Host.hpp"
  10 #include "src/kernel/resource/DiskImpl.hpp"
  11 #include "src/mc/mc_replay.hpp"
  12 #include "src/simix/smx_private.hpp"
  13 #include "src/surf/StorageImpl.hpp"
  14 #include "src/surf/cpu_interface.hpp"
  15
  16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_io, simix, "Logging specific to SIMIX (io)");
  17
  18 void simcall_HANDLER_io_wait(smx_simcall_t simcall, simgrid::kernel::activity::IoImpl* synchro, double timeout)
  19 {
  20   XBT_DEBUG("Wait for execution of synchro %p, state %d", synchro, (int)synchro->state_);
  21
  22   /* Associate this simcall to the synchro */
  23   synchro->register_simcall(simcall);
  24
  25   if (MC_is_active() || MC_record_replay_is_active()) {
  26     int idx = SIMCALL_GET_MC_VALUE(*simcall);
  27     if (idx == 0) {
  28       synchro->state_ = simgrid::kernel::activity::State::DONE;
  29     } else {
  30       /* If we reached this point, the wait simcall must have a timeout */
  31       /* Otherwise it shouldn't be enabled and executed by the MC */
  32       if (timeout < 0.0)
  33         THROW_IMPOSSIBLE;
  34       synchro->state_ = simgrid::kernel::activity::State::TIMEOUT;
  35     }
  36     synchro->finish();
  37     return;
  38   }
  39
  40   /* If the synchro is already finished then perform the error handling */
  41   if (synchro->state_ != simgrid::kernel::activity::State::RUNNING)
  42     synchro->finish();
  43   else {
  44     /* we need a sleep action (even when there is no timeout) to be notified of host failures */
  45     if (synchro->get_disk() != nullptr)
  46       synchro->set_timeout_detector(synchro->get_disk()->get_host()->pimpl_cpu->sleep(timeout));
  47     else
  48       synchro->set_timeout_detector(
  49           simgrid::s4u::Host::by_name(synchro->get_storage()->get_host())->pimpl_cpu->sleep(timeout));
  50   }
  51 }
  52
  53 namespace simgrid {
  54 namespace kernel {
  55 namespace activity {
  56
  57 IoImpl& IoImpl::set_type(s4u::Io::OpType type)
  58 {
  59   type_ = type;
  60   return *this;
  61 }
  62
  63 IoImpl& IoImpl::set_size(sg_size_t size)
  64 {
  65   size_ = size;
  66   return *this;
  67 }
  68
  69 IoImpl& IoImpl::set_disk(resource::DiskImpl* disk)
  70 {
  71   disk_ = disk;
  72   return *this;
  73 }
  74
  75 IoImpl& IoImpl::set_storage(resource::StorageImpl* storage)
  76 {
  77   storage_ = storage;
  78   return *this;
  79 }
  80
  81 IoImpl* IoImpl::start()
  82 {
  83   state_ = State::RUNNING;
  84   if (storage_)
  85     surf_action_ = storage_->io_start(size_, type_);
  86   else
  87     surf_action_ = disk_->io_start(size_, type_);
  88   surf_action_->set_activity(this);
  89
  90   XBT_DEBUG("Create IO synchro %p %s", this, get_cname());
  91   IoImpl::on_start(*this);
  92
  93   return this;
  94 }
  95
  96 void IoImpl::post()
  97 {
  98   performed_ioops_ = surf_action_->get_cost();
  99   if (surf_action_->get_state() == resource::Action::State::FAILED) {
 100     if ((storage_ && not storage_->is_on()) || (disk_ && not disk_->is_on()))
 101       state_ = State::FAILED;
 102     else
 103       state_ = State::CANCELED;
 104   } else if (surf_action_->get_state() == resource::Action::State::FINISHED) {
 105     state_ = State::DONE;
 106   } else if (timeout_detector_ && timeout_detector_->get_state() == resource::Action::State::FINISHED) {
 107     state_ = State::TIMEOUT;
 108   }
 109
 110   if (timeout_detector_) {
 111     timeout_detector_->unref();
 112     timeout_detector_ = nullptr;
 113   }
 114
 115   on_completion(*this);
 116
 117   /* Answer all simcalls associated with the synchro */
 118   finish();
 119 }
 120
 121 void IoImpl::finish()
 122 {
 123   while (not simcalls_.empty()) {
 124     const s_smx_simcall* simcall = simcalls_.front();
 125     simcalls_.pop_front();
 126     switch (state_) {
 127       case State::DONE:
 128         /* do nothing, synchro done */
 129         break;
 130       case State::FAILED:
 131         simcall->issuer_->context_->set_wannadie();
 132         simcall->issuer_->exception_ =
 133             std::make_exception_ptr(StorageFailureException(XBT_THROW_POINT, "Storage failed"));
 134         break;
 135       case State::CANCELED:
 136         simcall->issuer_->exception_ = std::make_exception_ptr(CancelException(XBT_THROW_POINT, "I/O Canceled"));
 137         break;
 138       case State::TIMEOUT:
 139         XBT_DEBUG("IoImpl::finish(): execution timeouted");
 140         simcall->issuer_->exception_ = std::make_exception_ptr(simgrid::TimeoutException(XBT_THROW_POINT, "Timeouted"));
 141         break;
 142       default:
 143         xbt_die("Internal error in IoImpl::finish(): unexpected synchro state %d", static_cast<int>(state_));
 144     }
 145
 146     simcall->issuer_->waiting_synchro = nullptr;
 147     simcall->issuer_->simcall_answer();
 148   }
 149 }
 150
 151 /*************
 152  * Callbacks *
 153  *************/
 154 xbt::signal<void(IoImpl const&)> IoImpl::on_start;
 155 xbt::signal<void(IoImpl const&)> IoImpl::on_completion;
 156
 157 } // namespace activity
 158 } // namespace kernel
 159 } // namespace simgrid