src/kernel/resource/DiskImpl.cpp

   1 /* Copyright (c) 2019-2021. 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 "DiskImpl.hpp"
   7
   8 #include "simgrid/s4u/Engine.hpp"
   9 #include "src/kernel/EngineImpl.hpp"
  10 #include "src/kernel/lmm/maxmin.hpp"
  11
  12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_disk, ker_resource, "Disk resources, that fuel I/O activities");
  13
  14 namespace simgrid {
  15 namespace kernel {
  16 namespace resource {
  17
  18 xbt::signal<void(DiskAction const&, Action::State, Action::State)> DiskAction::on_state_change;
  19
  20 /*********
  21  * Model *
  22  *********/
  23
  24 DiskModel::DiskModel(const std::string& name) : Model(name)
  25 {
  26   set_maxmin_system(new lmm::System(true /* selective update */));
  27 }
  28
  29 /************
  30  * Resource *
  31  ************/
  32 DiskImpl* DiskImpl::set_host(s4u::Host* host)
  33 {
  34   xbt_assert(host, "Cannot set host, none given");
  35   host_ = host;
  36   return this;
  37 }
  38
  39 DiskImpl* DiskImpl::set_read_bandwidth(double read_bw)
  40 {
  41   read_bw_ = read_bw;
  42   return this;
  43 }
  44
  45 DiskImpl* DiskImpl::set_write_bandwidth(double write_bw)
  46 {
  47   write_bw_ = write_bw;
  48   return this;
  49 }
  50
  51 DiskImpl* DiskImpl::set_read_constraint(lmm::Constraint* constraint_read)
  52 {
  53   constraint_read_ = constraint_read;
  54   return this;
  55 }
  56
  57 DiskImpl* DiskImpl::set_write_constraint(lmm::Constraint* constraint_write)
  58 {
  59   constraint_write_ = constraint_write;
  60   return this;
  61 }
  62
  63 /** @brief Fire the required callbacks and destroy the object
  64  *
  65  * Don't delete directly a Disk, call d->destroy() instead.
  66  */
  67 void DiskImpl::destroy()
  68 {
  69   s4u::Disk::on_destruction(piface_);
  70   delete this;
  71 }
  72
  73 bool DiskImpl::is_used() const
  74 {
  75   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
  76 }
  77
  78 void DiskImpl::apply_event(kernel::profile::Event* /*event*/, double /*value*/)
  79 {
  80   THROW_UNIMPLEMENTED;
  81 }
  82
  83 void DiskImpl::turn_on()
  84 {
  85   if (not is_on()) {
  86     Resource::turn_on();
  87     s4u::Disk::on_state_change(piface_);
  88   }
  89 }
  90 void DiskImpl::turn_off()
  91 {
  92   if (is_on()) {
  93     Resource::turn_off();
  94     s4u::Disk::on_state_change(piface_);
  95   }
  96 }
  97
  98 void DiskImpl::seal()
  99 {
 100   xbt_assert(this->get_model(), "Cannot seal Disk (%s) without setting the model first", get_cname());
 101   lmm::System* maxmin_system = get_model()->get_maxmin_system();
 102   this->set_read_constraint(maxmin_system->constraint_new(this, read_bw_))
 103       ->set_write_constraint(maxmin_system->constraint_new(this, write_bw_))
 104       ->set_constraint(maxmin_system->constraint_new(this, std::max(read_bw_, write_bw_)));
 105   XBT_DEBUG("Create resource with read_bw '%f' write_bw '%f'", read_bw_, write_bw_);
 106   Resource::seal();
 107   turn_on();
 108 }
 109
 110 /**********
 111  * Action *
 112  **********/
 113 void DiskAction::set_state(Action::State new_state)
 114 {
 115   Action::State previous_state = get_state();
 116   if (new_state != previous_state) { // Trigger only if the state changed
 117     Action::set_state(new_state);
 118     on_state_change(*this, previous_state, new_state);
 119   }
 120 }
 121 } // namespace resource
 122 } // namespace kernel
 123 } // namespace simgrid