1 /* Copyright (c) 2006-2021. The SimGrid Team. All rights reserved. */
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. */
6 #ifndef SIMGRID_S4U_ACTIVITY_HPP
7 #define SIMGRID_S4U_ACTIVITY_HPP
9 #include <xbt/asserts.h>
13 #include <simgrid/forward.h>
17 #include <xbt/signal.hpp>
18 #include <xbt/utility.hpp>
20 XBT_LOG_EXTERNAL_CATEGORY(s4u_activity);
27 * This class is the ancestor of every activities that an actor can undertake.
28 * That is, activities are all the things that do take time to the actor in the simulated world.
30 class XBT_PUBLIC Activity {
36 // enum class State { ... }
37 XBT_DECLARE_ENUM_CLASS(State, INITED, STARTING, STARTED, FAILED, CANCELED, FINISHED);
39 virtual bool is_assigned() const = 0;
40 virtual bool dependencies_solved() const { return dependencies_.empty(); }
44 virtual ~Activity() = default;
46 void release_dependencies()
48 while (not successors_.empty()) {
49 ActivityPtr b = successors_.back();
50 XBT_CVERB(s4u_activity, "Remove a dependency from '%s' on '%s'", get_cname(), b->get_cname());
51 b->dependencies_.erase(this);
52 if (b->dependencies_solved()) {
55 successors_.pop_back();
59 void add_successor(ActivityPtr a)
62 throw std::invalid_argument("Cannot be its own successor");
63 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
64 if (p != successors_.end())
65 throw std::invalid_argument("Dependency already exists");
67 successors_.push_back(a);
68 a->dependencies_.insert({this});
71 void remove_successor(ActivityPtr a)
74 throw std::invalid_argument("Cannot ask to remove itself from successors list");
76 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
77 if (p != successors_.end()){
79 a->dependencies_.erase({this});
81 throw std::invalid_argument("Dependency does not exist. Can not be removed.");
84 static std::set<Activity*>* vetoed_activities_;
87 /*! Signal fired each time that the activity fails to start because of a veto (e.g., unsolved dependency or no
88 * resource assigned) */
89 static xbt::signal<void(Activity&)> on_veto;
90 /*! Signal fired when theactivity completes (either normally, cancelled or failed) */
91 static xbt::signal<void(Activity&)> on_completion;
95 state_ = State::STARTING;
96 if (dependencies_solved() && is_assigned()) {
97 XBT_CVERB(s4u_activity, "'%s' is assigned to a resource and all dependencies are solved. Let's start", get_cname());
100 if (vetoed_activities_ != nullptr)
101 vetoed_activities_->insert(this);
106 void complete(Activity::State state)
109 if (state == State::FINISHED)
110 release_dependencies();
111 on_completion(*this);
114 static std::set<Activity*>* get_vetoed_activities() { return vetoed_activities_; }
115 static void set_vetoed_activities(std::set<Activity*>* whereto) { vetoed_activities_ = whereto; }
118 Activity(Activity const&) = delete;
119 Activity& operator=(Activity const&) = delete;
122 /** Starts a previously created activity.
124 * This function is optional: you can call wait() even if you didn't call start()
126 virtual Activity* start() = 0;
127 /** Blocks the current actor until the activity is terminated */
128 Activity* wait() { return wait_for(-1.0); }
129 /** Blocks the current actor until the activity is terminated, or until the timeout is elapsed\n
130 * Raises: timeout exception.*/
131 Activity* wait_for(double timeout);
132 /** Blocks the current actor until the activity is terminated, or until the time limit is reached\n
133 * Raises: timeout exception. */
134 void wait_until(double time_limit);
136 /** Cancel that activity */
138 /** Retrieve the current state of the activity */
139 Activity::State get_state() const { return state_; }
140 /** Return a string representation of the activity's state (one of INITED, STARTING, STARTED, CANCELED, FINISHED) */
141 const char* get_state_str() const;
142 void set_state(Activity::State state) { state_ = state; }
143 /** Tests whether the given activity is terminated yet. */
146 /** Blocks the progression of this activity until it gets resumed */
147 virtual Activity* suspend();
148 /** Unblock the progression of this activity if it was suspended previously */
149 virtual Activity* resume();
150 /** Whether or not the progression of this activity is blocked */
151 bool is_suspended() const { return suspended_; }
153 virtual const char* get_cname() const = 0;
154 virtual const std::string& get_name() const = 0;
156 /** Get the remaining amount of work that this Activity entails. When it's 0, it's done. */
157 virtual double get_remaining() const;
158 /** Set the [remaining] amount of work that this Activity will entail
160 * It is forbidden to change the amount of work once the Activity is started */
161 Activity* set_remaining(double remains);
163 /** Returns the internal implementation of this Activity */
164 kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
167 friend void intrusive_ptr_release(Activity* a)
169 if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
170 std::atomic_thread_fence(std::memory_order_acquire);
174 friend void intrusive_ptr_add_ref(Activity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
178 intrusive_ptr_add_ref(this);
181 void unref() { intrusive_ptr_release(this); }
184 kernel::activity::ActivityImplPtr pimpl_ = nullptr;
185 Activity::State state_ = Activity::State::INITED;
187 bool suspended_ = false;
188 std::vector<ActivityPtr> successors_;
189 std::set<ActivityPtr> dependencies_;
190 std::atomic_int_fast32_t refcount_{0};
193 template <class AnyActivity> class Activity_T : public Activity {
194 std::string name_ = "unnamed";
195 std::string tracing_category_ = "";
196 void* user_data_ = nullptr;
199 AnyActivity* add_successor(ActivityPtr a)
201 Activity::add_successor(a);
202 return static_cast<AnyActivity*>(this);
204 AnyActivity* remove_successor(ActivityPtr a)
206 Activity::remove_successor(a);
207 return static_cast<AnyActivity*>(this);
209 AnyActivity* set_name(const std::string& name)
211 xbt_assert(get_state() == State::INITED, "Cannot change the name of an activity after its start");
213 return static_cast<AnyActivity*>(this);
215 const std::string& get_name() const override { return name_; }
216 const char* get_cname() const override { return name_.c_str(); }
218 AnyActivity* set_tracing_category(const std::string& category)
220 xbt_assert(get_state() == State::INITED, "Cannot change the tracing category of an activity after its start");
221 tracing_category_ = category;
222 return static_cast<AnyActivity*>(this);
224 const std::string& get_tracing_category() const { return tracing_category_; }
226 AnyActivity* set_user_data(void* data)
229 return static_cast<AnyActivity*>(this);
232 void* get_user_data() const { return user_data_; }
234 AnyActivity* vetoable_start()
236 Activity::vetoable_start();
237 return static_cast<AnyActivity*>(this);
240 AnyActivity* cancel() { return static_cast<AnyActivity*>(Activity::cancel()); }
241 AnyActivity* wait() { return wait_for(-1.0); }
242 virtual AnyActivity* wait_for(double timeout) { return static_cast<AnyActivity*>(Activity::wait_for(timeout)); }
245 /* The refcounting is done in the ancestor class, Activity, but we want each of the classes benefiting of the CRTP
246 * (Exec, Comm, etc) to have smart pointers too, so we define these methods here, that forward the ptr_release and
247 * add_ref to the Activity class. Hopefully, the "inline" helps to not hinder the perf here.
249 friend void inline intrusive_ptr_release(AnyActivity* a) { intrusive_ptr_release(static_cast<Activity*>(a)); }
250 friend void inline intrusive_ptr_add_ref(AnyActivity* a) { intrusive_ptr_add_ref(static_cast<Activity*>(a)); }
255 } // namespace simgrid
257 #endif /* SIMGRID_S4U_ACTIVITY_HPP */