1 /* Copyright (c) 2006-2022. 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);
25 extern template class XBT_PUBLIC xbt::Extendable<s4u::Activity>;
31 * This class is the ancestor of every activities that an actor can undertake.
32 * That is, activities are all the things that do take time to the actor in the simulated world.
34 class XBT_PUBLIC Activity : public xbt::Extendable<Activity> {
39 friend kernel::activity::ActivityImpl;
40 friend std::vector<ActivityPtr> create_DAG_from_dot(const std::string& filename);
41 friend std::vector<ActivityPtr> create_DAG_from_DAX(const std::string& filename);
45 // enum class State { ... }
46 XBT_DECLARE_ENUM_CLASS(State, INITED, STARTING, STARTED, FAILED, CANCELED, FINISHED);
48 virtual bool is_assigned() const = 0;
49 bool dependencies_solved() const { return dependencies_.empty(); }
50 bool has_no_successor() const { return successors_.empty(); }
51 const std::set<ActivityPtr>& get_dependencies() const { return dependencies_; }
52 const std::vector<ActivityPtr>& get_successors() const { return successors_; }
56 virtual ~Activity() = default;
59 void release_dependencies()
61 while (not successors_.empty()) {
62 ActivityPtr b = successors_.back();
63 XBT_CVERB(s4u_activity, "Remove a dependency from '%s' on '%s'", get_cname(), b->get_cname());
64 b->dependencies_.erase(this);
65 if (b->dependencies_solved()) {
68 successors_.pop_back();
72 void add_successor(ActivityPtr a)
75 throw std::invalid_argument("Cannot be its own successor");
76 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
77 if (p != successors_.end())
78 throw std::invalid_argument("Dependency already exists");
80 successors_.push_back(a);
81 a->dependencies_.insert({this});
84 void remove_successor(ActivityPtr a)
87 throw std::invalid_argument("Cannot ask to remove itself from successors list");
89 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
90 if (p != successors_.end()){
92 a->dependencies_.erase({this});
94 throw std::invalid_argument("Dependency does not exist. Can not be removed.");
97 static std::set<Activity*>* vetoed_activities_;
100 static xbt::signal<void(Activity&)> on_veto;
101 static xbt::signal<void(Activity const&)> on_completion;
102 static xbt::signal<void(Activity const&)> on_suspended;
103 static xbt::signal<void(Activity const&)> on_resumed;
106 /*! Add a callback fired each time that the activity fails to start because of a veto (e.g., unsolved dependency or no
107 * resource assigned) */
108 static void on_veto_cb(const std::function<void(Activity&)>& cb) { on_veto.connect(cb); }
109 /*! Add a callback fired when the activity completes (either normally, cancelled or failed) */
110 static void on_completion_cb(const std::function<void(Activity const&)>& cb) { on_completion.connect(cb); }
111 /*! Add a callback fired when the activity is suspended */
112 static void on_suspended_cb(const std::function<void(Activity const&)>& cb) { on_suspended.connect(cb); }
113 /*! Add a callback fired when the activity is resumed after being suspended */
114 static void on_resumed_cb(const std::function<void(Activity const&)>& cb) { on_resumed.connect(cb); }
116 void vetoable_start()
118 state_ = State::STARTING;
119 if (dependencies_solved() && is_assigned()) {
120 XBT_CVERB(s4u_activity, "'%s' is assigned to a resource and all dependencies are solved. Let's start", get_cname());
123 if (vetoed_activities_ != nullptr)
124 vetoed_activities_->insert(this);
129 void complete(Activity::State state)
132 on_completion(*this);
133 if (state == State::FINISHED)
134 release_dependencies();
137 static std::set<Activity*>* get_vetoed_activities() { return vetoed_activities_; }
138 static void set_vetoed_activities(std::set<Activity*>* whereto) { vetoed_activities_ = whereto; }
141 Activity(Activity const&) = delete;
142 Activity& operator=(Activity const&) = delete;
145 /** Starts a previously created activity.
147 * This function is optional: you can call wait() even if you didn't call start()
149 virtual Activity* start() = 0;
150 /** Tests whether the given activity is terminated yet. */
152 /*! take a vector s4u::ActivityPtr and return the rank of the first finished one (or -1 if none is done). */
153 static ssize_t test_any(const std::vector<ActivityPtr>& activities);
155 /** Blocks the current actor until the activity is terminated */
156 Activity* wait() { return wait_for(-1.0); }
157 /** Blocks the current actor until the activity is terminated, or until the timeout is elapsed\n
158 * Raises: timeout exception.*/
159 Activity* wait_for(double timeout);
160 /** Blocks the current actor until the activity is terminated, or until the time limit is reached\n
161 * Raises: timeout exception. */
162 void wait_until(double time_limit);
163 /*! take a vector of s4u::ActivityPtr and return when one of them is finished.
164 * The return value is the rank of the first finished ActivityPtr. */
165 static ssize_t wait_any(const std::vector<ActivityPtr>& activities) { return wait_any_for(activities, -1); }
166 /*! Same as wait_any, but with a timeout. If the timeout occurs, parameter last is returned.*/
167 static ssize_t wait_any_for(const std::vector<ActivityPtr>& activities, double timeout);
169 /** Cancel that activity */
171 /** Retrieve the current state of the activity */
172 Activity::State get_state() const { return state_; }
173 /** Return a string representation of the activity's state (one of INITED, STARTING, STARTED, CANCELED, FINISHED) */
174 const char* get_state_str() const;
175 void set_state(Activity::State state) { state_ = state; }
177 /** Blocks the progression of this activity until it gets resumed */
178 virtual Activity* suspend();
179 /** Unblock the progression of this activity if it was suspended previously */
180 virtual Activity* resume();
181 /** Whether or not the progression of this activity is blocked */
182 bool is_suspended() const { return suspended_; }
184 virtual const char* get_cname() const = 0;
185 virtual const std::string& get_name() const = 0;
187 /** Get the remaining amount of work that this Activity entails. When it's 0, it's done. */
188 virtual double get_remaining() const;
189 /** Set the [remaining] amount of work that this Activity will entail
191 * It is forbidden to change the amount of work once the Activity is started */
192 Activity* set_remaining(double remains);
194 double get_start_time() const;
195 double get_finish_time() const;
196 void mark() { marked_ = true; }
197 bool is_marked() const { return marked_; }
199 /** Returns the internal implementation of this Activity */
200 kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
203 friend void intrusive_ptr_release(Activity* a)
205 if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
206 std::atomic_thread_fence(std::memory_order_acquire);
210 friend void intrusive_ptr_add_ref(Activity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
214 intrusive_ptr_add_ref(this);
217 void unref() { intrusive_ptr_release(this); }
220 kernel::activity::ActivityImplPtr pimpl_ = nullptr;
221 Activity::State state_ = Activity::State::INITED;
223 bool suspended_ = false;
224 bool marked_ = false;
225 std::vector<ActivityPtr> successors_;
226 std::set<ActivityPtr> dependencies_;
227 std::atomic_int_fast32_t refcount_{0};
230 template <class AnyActivity> class Activity_T : public Activity {
231 std::string name_ = "unnamed";
232 std::string tracing_category_ = "";
235 AnyActivity* add_successor(ActivityPtr a)
237 Activity::add_successor(a);
238 return static_cast<AnyActivity*>(this);
240 AnyActivity* remove_successor(ActivityPtr a)
242 Activity::remove_successor(a);
243 return static_cast<AnyActivity*>(this);
245 AnyActivity* set_name(const std::string& name)
248 return static_cast<AnyActivity*>(this);
250 const std::string& get_name() const override { return name_; }
251 const char* get_cname() const override { return name_.c_str(); }
253 AnyActivity* set_tracing_category(const std::string& category)
255 xbt_assert(get_state() == State::INITED, "Cannot change the tracing category of an activity after its start");
256 tracing_category_ = category;
257 return static_cast<AnyActivity*>(this);
259 const std::string& get_tracing_category() const { return tracing_category_; }
261 XBT_ATTRIB_DEPRECATED_v334("Please use Activity::set_data()") AnyActivity* set_user_data(void* data)
264 return static_cast<AnyActivity*>(this);
267 XBT_ATTRIB_DEPRECATED_v334("Please use Activity::get_data<>()") void* get_user_data() const
269 return get_data<void>();
272 AnyActivity* vetoable_start()
274 Activity::vetoable_start();
275 return static_cast<AnyActivity*>(this);
278 AnyActivity* cancel() { return static_cast<AnyActivity*>(Activity::cancel()); }
279 AnyActivity* wait() { return wait_for(-1.0); }
280 virtual AnyActivity* wait_for(double timeout) { return static_cast<AnyActivity*>(Activity::wait_for(timeout)); }
283 /* The refcounting is done in the ancestor class, Activity, but we want each of the classes benefiting of the CRTP
284 * (Exec, Comm, etc) to have smart pointers too, so we define these methods here, that forward the ptr_release and
285 * add_ref to the Activity class. Hopefully, the "inline" helps to not hinder the perf here.
287 friend void inline intrusive_ptr_release(AnyActivity* a) { intrusive_ptr_release(static_cast<Activity*>(a)); }
288 friend void inline intrusive_ptr_add_ref(AnyActivity* a) { intrusive_ptr_add_ref(static_cast<Activity*>(a)); }
293 } // namespace simgrid
295 #endif /* SIMGRID_S4U_ACTIVITY_HPP */