1 /* Copyright (c) 2006-2023. 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);
42 friend std::vector<ActivityPtr> create_DAG_from_json(const std::string& filename);
46 // enum class State { ... }
47 XBT_DECLARE_ENUM_CLASS(State, INITED, STARTING, STARTED, FAILED, CANCELED, FINISHED);
49 virtual bool is_assigned() const = 0;
50 bool dependencies_solved() const { return dependencies_.empty(); }
51 bool has_no_successor() const { return successors_.empty(); }
52 const std::set<ActivityPtr>& get_dependencies() const { return dependencies_; }
53 const std::vector<ActivityPtr>& get_successors() const { return successors_; }
54 virtual void fire_this_completion() const = 0;
58 virtual ~Activity() = default;
61 void release_dependencies()
63 while (not successors_.empty()) {
64 ActivityPtr b = successors_.back();
65 XBT_CVERB(s4u_activity, "Remove a dependency from '%s' on '%s'", get_cname(), b->get_cname());
66 b->dependencies_.erase(this);
67 if (b->dependencies_solved()) {
70 successors_.pop_back();
74 void add_successor(ActivityPtr a)
77 throw std::invalid_argument("Cannot be its own successor");
78 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
79 if (p != successors_.end())
80 throw std::invalid_argument("Dependency already exists");
82 successors_.push_back(a);
83 a->dependencies_.insert({this});
86 void remove_successor(ActivityPtr a)
89 throw std::invalid_argument("Cannot ask to remove itself from successors list");
91 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
92 if (p != successors_.end()){
94 a->dependencies_.erase({this});
96 throw std::invalid_argument("Dependency does not exist. Can not be removed.");
99 static std::set<Activity*>* vetoed_activities_;
101 /** Set the [remaining] amount of work that this Activity will entail
103 * It is forbidden to change the amount of work once the Activity is started */
104 Activity* set_remaining(double remains);
107 static xbt::signal<void(Activity&)> on_veto;
108 static xbt::signal<void(Activity const&)> on_suspended;
109 static xbt::signal<void(Activity const&)> on_resumed;
112 /*! Add a callback fired each time that the activity fails to start because of a veto (e.g., unsolved dependency or no
113 * resource assigned) */
114 static void on_veto_cb(const std::function<void(Activity&)>& cb) { on_veto.connect(cb); }
115 /*! Add a callback fired when the activity is suspended */
116 static void on_suspended_cb(const std::function<void(Activity const&)>& cb) { on_suspended.connect(cb); }
117 /*! Add a callback fired when the activity is resumed after being suspended */
118 static void on_resumed_cb(const std::function<void(Activity const&)>& cb) { on_resumed.connect(cb); }
120 XBT_ATTRIB_DEPRECATED_v334("All start() are vetoable now. Please use start() ") void vetoable_start()
126 state_ = State::STARTING;
127 if (dependencies_solved() && is_assigned()) {
128 XBT_CVERB(s4u_activity, "'%s' is assigned to a resource and all dependencies are solved. Let's start", get_cname());
131 if (vetoed_activities_ != nullptr)
132 vetoed_activities_->insert(this);
137 void complete(Activity::State state)
139 // Ensure that the current activity remains alive until the end of the function, even if its last reference is
140 // released by the on_completion() callbacks.
141 ActivityPtr keepalive(this);
143 fire_this_completion();
144 if (state == State::FINISHED)
145 release_dependencies();
148 static std::set<Activity*>* get_vetoed_activities() { return vetoed_activities_; }
149 static void set_vetoed_activities(std::set<Activity*>* whereto) { vetoed_activities_ = whereto; }
152 Activity(Activity const&) = delete;
153 Activity& operator=(Activity const&) = delete;
156 /** Starts a previously created activity.
158 * This function is optional: you can call wait() even if you didn't call start()
160 virtual Activity* do_start() = 0;
161 /** Tests whether the given activity is terminated yet. */
163 /*! take a vector s4u::ActivityPtr and return the rank of the first finished one (or -1 if none is done). */
164 static ssize_t test_any(const std::vector<ActivityPtr>& activities);
166 /** Blocks the current actor until the activity is terminated */
167 Activity* wait() { return wait_for(-1.0); }
168 /** Blocks the current actor until the activity is terminated, or until the timeout is elapsed\n
169 * Raises: timeout exception.*/
170 Activity* wait_for(double timeout);
171 /** Blocks the current actor until the activity is terminated, or until the time limit is reached\n
172 * Raises: timeout exception. */
173 void wait_until(double time_limit);
174 /*! take a vector of s4u::ActivityPtr and return when one of them is finished.
175 * The return value is the rank of the first finished ActivityPtr. */
176 static ssize_t wait_any(const std::vector<ActivityPtr>& activities) { return wait_any_for(activities, -1); }
177 /*! Same as wait_any, but with a timeout. If the timeout occurs, parameter last is returned.*/
178 static ssize_t wait_any_for(const std::vector<ActivityPtr>& activities, double timeout);
180 /** Cancel that activity */
182 /** Retrieve the current state of the activity */
183 Activity::State get_state() const { return state_; }
184 /** Return a string representation of the activity's state (one of INITED, STARTING, STARTED, CANCELED, FINISHED) */
185 const char* get_state_str() const;
186 void set_state(Activity::State state) { state_ = state; }
188 /** Blocks the progression of this activity until it gets resumed */
189 virtual Activity* suspend();
190 /** Unblock the progression of this activity if it was suspended previously */
191 virtual Activity* resume();
192 /** Whether or not the progression of this activity is blocked */
193 bool is_suspended() const { return suspended_; }
195 virtual const char* get_cname() const = 0;
196 virtual const std::string& get_name() const = 0;
198 /** Get the remaining amount of work that this Activity entails. When it's 0, it's done. */
199 virtual double get_remaining() const;
201 double get_start_time() const;
202 double get_finish_time() const;
203 void mark() { marked_ = true; }
204 bool is_marked() const { return marked_; }
206 /** Returns the internal implementation of this Activity */
207 kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
210 friend void intrusive_ptr_release(Activity* a)
212 if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
213 std::atomic_thread_fence(std::memory_order_acquire);
217 friend void intrusive_ptr_add_ref(Activity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
221 intrusive_ptr_add_ref(this);
224 void unref() { intrusive_ptr_release(this); }
227 kernel::activity::ActivityImplPtr pimpl_ = nullptr;
228 Activity::State state_ = Activity::State::INITED;
230 bool suspended_ = false;
231 bool marked_ = false;
232 std::vector<ActivityPtr> successors_;
233 std::set<ActivityPtr> dependencies_;
234 std::atomic_int_fast32_t refcount_{0};
237 template <class AnyActivity> class Activity_T : public Activity {
238 std::string name_ = "unnamed";
239 std::string tracing_category_ = "";
242 static xbt::signal<void(AnyActivity const&)> on_completion;
243 /*! Add a callback fired when the activity completes (either normally, cancelled or failed) */
244 static void on_completion_cb(const std::function<void(AnyActivity const&)>& cb) { on_completion.connect(cb); }
246 AnyActivity* add_successor(ActivityPtr a)
248 Activity::add_successor(a);
249 return static_cast<AnyActivity*>(this);
251 AnyActivity* remove_successor(ActivityPtr a)
253 Activity::remove_successor(a);
254 return static_cast<AnyActivity*>(this);
256 AnyActivity* set_name(const std::string& name)
259 return static_cast<AnyActivity*>(this);
261 const std::string& get_name() const override { return name_; }
262 const char* get_cname() const override { return name_.c_str(); }
264 AnyActivity* set_tracing_category(const std::string& category)
266 xbt_assert(get_state() == State::INITED || get_state() == State::STARTING,
267 "Cannot change the tracing category of an activity after its start");
268 tracing_category_ = category;
269 return static_cast<AnyActivity*>(this);
271 const std::string& get_tracing_category() const { return tracing_category_; }
273 XBT_ATTRIB_DEPRECATED_v334("Please use Activity::set_data()") AnyActivity* set_user_data(void* data)
276 return static_cast<AnyActivity*>(this);
279 XBT_ATTRIB_DEPRECATED_v334("Please use Activity::get_data<>()") void* get_user_data() const
281 return get_data<void>();
283 XBT_ATTRIB_DEPRECATED_v334("All start() are vetoable now. Please use start() ") AnyActivity* vetoable_start()
290 return static_cast<AnyActivity*>(this);
293 AnyActivity* cancel() { return static_cast<AnyActivity*>(Activity::cancel()); }
294 AnyActivity* wait() { return wait_for(-1.0); }
295 virtual AnyActivity* wait_for(double timeout) {
296 return static_cast<AnyActivity*>(Activity::wait_for(timeout));
300 /* The refcounting is done in the ancestor class, Activity, but we want each of the classes benefiting of the CRTP
301 * (Exec, Comm, etc) to have smart pointers too, so we define these methods here, that forward the ptr_release and
302 * add_ref to the Activity class. Hopefully, the "inline" helps to not hinder the perf here.
304 friend void inline intrusive_ptr_release(AnyActivity* a) { intrusive_ptr_release(static_cast<Activity*>(a)); }
305 friend void inline intrusive_ptr_add_ref(AnyActivity* a) { intrusive_ptr_add_ref(static_cast<Activity*>(a)); }
310 } // namespace simgrid
312 #endif /* SIMGRID_S4U_ACTIVITY_HPP */