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
12 #include <simgrid/forward.h>
16 #include <xbt/Extendable.hpp>
17 #include <xbt/asserts.h>
18 #include <xbt/signal.hpp>
19 #include <xbt/utility.hpp>
21 XBT_LOG_EXTERNAL_CATEGORY(s4u_activity);
28 * This class is the ancestor of every activities that an actor can undertake.
29 * That is, activities are all the things that do take time to the actor in the simulated world.
31 class XBT_PUBLIC Activity : public xbt::Extendable<Activity> {
36 friend std::vector<ActivityPtr> create_DAG_from_dot(const std::string& filename);
37 friend std::vector<ActivityPtr> create_DAG_from_DAX(const std::string& filename);
41 // enum class State { ... }
42 XBT_DECLARE_ENUM_CLASS(State, INITED, STARTING, STARTED, FAILED, CANCELED, FINISHED);
44 virtual bool is_assigned() const = 0;
45 virtual bool dependencies_solved() const { return dependencies_.empty(); }
46 virtual unsigned long is_waited_by() const { return successors_.size(); }
47 const std::set<ActivityPtr>& get_dependencies() const { return dependencies_; }
48 const std::vector<ActivityPtr>& get_successors() const { return successors_; }
52 virtual ~Activity() = default;
55 void release_dependencies()
57 while (not successors_.empty()) {
58 ActivityPtr b = successors_.back();
59 XBT_CVERB(s4u_activity, "Remove a dependency from '%s' on '%s'", get_cname(), b->get_cname());
60 b->dependencies_.erase(this);
61 if (b->dependencies_solved()) {
64 successors_.pop_back();
68 void add_successor(ActivityPtr a)
71 throw std::invalid_argument("Cannot be its own successor");
72 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
73 if (p != successors_.end())
74 throw std::invalid_argument("Dependency already exists");
76 successors_.push_back(a);
77 a->dependencies_.insert({this});
80 void remove_successor(ActivityPtr a)
83 throw std::invalid_argument("Cannot ask to remove itself from successors list");
85 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
86 if (p != successors_.end()){
88 a->dependencies_.erase({this});
90 throw std::invalid_argument("Dependency does not exist. Can not be removed.");
93 static std::set<Activity*>* vetoed_activities_;
96 /*! Signal fired each time that the activity fails to start because of a veto (e.g., unsolved dependency or no
97 * resource assigned) */
98 static xbt::signal<void(Activity&)> on_veto;
99 /*! Signal fired when theactivity completes (either normally, cancelled or failed) */
100 static xbt::signal<void(Activity&)> on_completion;
102 void vetoable_start()
104 state_ = State::STARTING;
105 if (dependencies_solved() && is_assigned()) {
106 XBT_CVERB(s4u_activity, "'%s' is assigned to a resource and all dependencies are solved. Let's start", get_cname());
109 if (vetoed_activities_ != nullptr)
110 vetoed_activities_->insert(this);
115 void complete(Activity::State state)
118 on_completion(*this);
119 if (state == State::FINISHED)
120 release_dependencies();
123 static std::set<Activity*>* get_vetoed_activities() { return vetoed_activities_; }
124 static void set_vetoed_activities(std::set<Activity*>* whereto) { vetoed_activities_ = whereto; }
127 Activity(Activity const&) = delete;
128 Activity& operator=(Activity const&) = delete;
131 /** Starts a previously created activity.
133 * This function is optional: you can call wait() even if you didn't call start()
135 virtual Activity* start() = 0;
136 /** Blocks the current actor until the activity is terminated */
137 Activity* wait() { return wait_for(-1.0); }
138 /** Blocks the current actor until the activity is terminated, or until the timeout is elapsed\n
139 * Raises: timeout exception.*/
140 Activity* wait_for(double timeout);
141 /** Blocks the current actor until the activity is terminated, or until the time limit is reached\n
142 * Raises: timeout exception. */
143 void wait_until(double time_limit);
145 /** Cancel that activity */
147 /** Retrieve the current state of the activity */
148 Activity::State get_state() const { return state_; }
149 /** Return a string representation of the activity's state (one of INITED, STARTING, STARTED, CANCELED, FINISHED) */
150 const char* get_state_str() const;
151 void set_state(Activity::State state) { state_ = state; }
152 /** Tests whether the given activity is terminated yet. */
155 /** Blocks the progression of this activity until it gets resumed */
156 virtual Activity* suspend();
157 /** Unblock the progression of this activity if it was suspended previously */
158 virtual Activity* resume();
159 /** Whether or not the progression of this activity is blocked */
160 bool is_suspended() const { return suspended_; }
162 virtual const char* get_cname() const = 0;
163 virtual const std::string& get_name() const = 0;
165 /** Get the remaining amount of work that this Activity entails. When it's 0, it's done. */
166 virtual double get_remaining() const;
167 /** Set the [remaining] amount of work that this Activity will entail
169 * It is forbidden to change the amount of work once the Activity is started */
170 Activity* set_remaining(double remains);
172 double get_start_time() const;
173 double get_finish_time() const;
174 void mark() { marked_ = true; }
175 bool is_marked() const { return marked_; }
177 /** Returns the internal implementation of this Activity */
178 kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
181 friend void intrusive_ptr_release(Activity* a)
183 if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
184 std::atomic_thread_fence(std::memory_order_acquire);
188 friend void intrusive_ptr_add_ref(Activity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
192 intrusive_ptr_add_ref(this);
195 void unref() { intrusive_ptr_release(this); }
198 kernel::activity::ActivityImplPtr pimpl_ = nullptr;
199 Activity::State state_ = Activity::State::INITED;
201 bool suspended_ = false;
202 bool marked_ = false;
203 std::vector<ActivityPtr> successors_;
204 std::set<ActivityPtr> dependencies_;
205 std::atomic_int_fast32_t refcount_{0};
208 template <class AnyActivity> class Activity_T : public Activity {
209 std::string name_ = "unnamed";
210 std::string tracing_category_ = "";
211 void* user_data_ = nullptr;
214 AnyActivity* add_successor(ActivityPtr a)
216 Activity::add_successor(a);
217 return static_cast<AnyActivity*>(this);
219 AnyActivity* remove_successor(ActivityPtr a)
221 Activity::remove_successor(a);
222 return static_cast<AnyActivity*>(this);
224 AnyActivity* set_name(const std::string& name)
226 xbt_assert(get_state() == State::INITED, "Cannot change the name of an activity after its start");
228 return static_cast<AnyActivity*>(this);
230 const std::string& get_name() const override { return name_; }
231 const char* get_cname() const override { return name_.c_str(); }
233 AnyActivity* set_tracing_category(const std::string& category)
235 xbt_assert(get_state() == State::INITED, "Cannot change the tracing category of an activity after its start");
236 tracing_category_ = category;
237 return static_cast<AnyActivity*>(this);
239 const std::string& get_tracing_category() const { return tracing_category_; }
241 AnyActivity* set_user_data(void* data)
244 return static_cast<AnyActivity*>(this);
247 void* get_user_data() const { return user_data_; }
249 AnyActivity* vetoable_start()
251 Activity::vetoable_start();
252 return static_cast<AnyActivity*>(this);
255 AnyActivity* cancel() { return static_cast<AnyActivity*>(Activity::cancel()); }
256 AnyActivity* wait() { return wait_for(-1.0); }
257 virtual AnyActivity* wait_for(double timeout) { return static_cast<AnyActivity*>(Activity::wait_for(timeout)); }
260 /* The refcounting is done in the ancestor class, Activity, but we want each of the classes benefiting of the CRTP
261 * (Exec, Comm, etc) to have smart pointers too, so we define these methods here, that forward the ptr_release and
262 * add_ref to the Activity class. Hopefully, the "inline" helps to not hinder the perf here.
264 friend void inline intrusive_ptr_release(AnyActivity* a) { intrusive_ptr_release(static_cast<Activity*>(a)); }
265 friend void inline intrusive_ptr_add_ref(AnyActivity* a) { intrusive_ptr_add_ref(static_cast<Activity*>(a)); }
270 } // namespace simgrid
272 #endif /* SIMGRID_S4U_ACTIVITY_HPP */