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, CANCELED, FINISHED);
41 virtual ~Activity() = default;
43 virtual bool is_assigned() const = 0;
45 virtual void complete(Activity::State state)
48 if (state == State::FINISHED)
49 release_dependencies();
52 void release_dependencies()
54 while (not successors_.empty()) {
55 ActivityPtr b = successors_.back();
56 XBT_CVERB(s4u_activity, "Remove a dependency from '%s' on '%s'", get_cname(), b->get_cname());
57 b->dependencies_.erase(this);
58 if (b->dependencies_.empty()) {
61 successors_.pop_back();
65 void add_successor(ActivityPtr a)
68 throw std::invalid_argument("Cannot be its own successor");
69 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
70 if (p != successors_.end())
71 throw std::invalid_argument("Dependency already exists");
73 successors_.push_back(a);
74 a->dependencies_.insert({this});
77 void remove_successor(ActivityPtr a)
80 throw std::invalid_argument("Cannot ask to remove its from successors");
82 auto p = std::find_if(successors_.begin(), successors_.end(), [a](ActivityPtr const& i){ return i.get() == a.get(); });
83 if (p != successors_.end()){
85 a->dependencies_.erase({this});
87 throw std::invalid_argument("Dependency does not exist. Can not be removed.");
93 state_ = State::STARTING;
94 if (dependencies_.empty() && is_assigned()) {
95 XBT_CVERB(s4u_activity, "'%s' is assigned to a resource and all dependencies are solved. Let's start", get_cname());
101 Activity(Activity const&) = delete;
102 Activity& operator=(Activity const&) = delete;
105 /** Starts a previously created activity.
107 * This function is optional: you can call wait() even if you didn't call start()
109 virtual Activity* start() = 0;
110 /** Blocks the current actor until the activity is terminated */
111 Activity* wait() { return wait_for(-1.0); }
112 /** Blocks the current actor until the activity is terminated, or until the timeout is elapsed\n
113 * Raises: timeout exception.*/
114 Activity* wait_for(double timeout);
115 /** Blocks the current actor until the activity is terminated, or until the time limit is reached\n
116 * Raises: timeout exception. */
117 void wait_until(double time_limit);
119 /** Cancel that activity */
121 /** Retrieve the current state of the activity */
122 Activity::State get_state() const { return state_; }
123 /** Return a string representation of the activity's state (one of INITED, STARTING, STARTED, CANCELED, FINISHED) */
124 const char* get_state_str() const;
125 void set_state(Activity::State state) { state_ = state; }
126 /** Tests whether the given activity is terminated yet. */
129 /** Blocks the progression of this activity until it gets resumed */
130 virtual Activity* suspend();
131 /** Unblock the progression of this activity if it was suspended previously */
132 virtual Activity* resume();
133 /** Whether or not the progression of this activity is blocked */
134 bool is_suspended() const { return suspended_; }
136 virtual const char* get_cname() const = 0;
137 virtual const std::string& get_name() const = 0;
139 /** Get the remaining amount of work that this Activity entails. When it's 0, it's done. */
140 virtual double get_remaining() const;
141 /** Set the [remaining] amount of work that this Activity will entail
143 * It is forbidden to change the amount of work once the Activity is started */
144 Activity* set_remaining(double remains);
146 /** Returns the internal implementation of this Activity */
147 kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
150 friend void intrusive_ptr_release(Activity* a)
152 if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
153 std::atomic_thread_fence(std::memory_order_acquire);
157 friend void intrusive_ptr_add_ref(Activity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
161 intrusive_ptr_add_ref(this);
164 void unref() { intrusive_ptr_release(this); }
167 kernel::activity::ActivityImplPtr pimpl_ = nullptr;
168 Activity::State state_ = Activity::State::INITED;
170 bool suspended_ = false;
171 std::vector<ActivityPtr> successors_;
172 std::set<ActivityPtr> dependencies_;
173 std::atomic_int_fast32_t refcount_{0};
176 template <class AnyActivity> class Activity_T : public Activity {
177 std::string name_ = "unnamed";
178 std::string tracing_category_ = "";
179 void* user_data_ = nullptr;
182 AnyActivity* add_successor(ActivityPtr a)
184 Activity::add_successor(a);
185 return static_cast<AnyActivity*>(this);
187 AnyActivity* remove_successor(ActivityPtr a)
189 Activity::remove_successor(a);
190 return static_cast<AnyActivity*>(this);
192 AnyActivity* set_name(const std::string& name)
194 xbt_assert(get_state() == State::INITED, "Cannot change the name of an activity after its start");
196 return static_cast<AnyActivity*>(this);
198 const std::string& get_name() const override { return name_; }
199 const char* get_cname() const override { return name_.c_str(); }
201 AnyActivity* set_tracing_category(const std::string& category)
203 xbt_assert(get_state() == State::INITED, "Cannot change the tracing category of an activity after its start");
204 tracing_category_ = category;
205 return static_cast<AnyActivity*>(this);
207 const std::string& get_tracing_category() const { return tracing_category_; }
209 AnyActivity* set_user_data(void* data)
212 return static_cast<AnyActivity*>(this);
215 void* get_user_data() const { return user_data_; }
217 AnyActivity* vetoable_start()
219 Activity::vetoable_start();
220 return static_cast<AnyActivity*>(this);
223 AnyActivity* cancel() { return static_cast<AnyActivity*>(Activity::cancel()); }
224 AnyActivity* wait() { return wait_for(-1.0); }
225 virtual AnyActivity* wait_for(double timeout) { return static_cast<AnyActivity*>(Activity::wait_for(timeout)); }
228 /* The refcounting is done in the ancestor class, Activity, but we want each of the classes benefiting of the CRTP
229 * (Exec, Comm, etc) to have smart pointers too, so we define these methods here, that forward the ptr_release and
230 * add_ref to the Activity class. Hopefully, the "inline" helps to not hinder the perf here.
232 friend void inline intrusive_ptr_release(AnyActivity* a) { intrusive_ptr_release(static_cast<Activity*>(a)); }
233 friend void inline intrusive_ptr_add_ref(AnyActivity* a) { intrusive_ptr_add_ref(static_cast<Activity*>(a)); }
238 } // namespace simgrid
240 #endif /* SIMGRID_S4U_ACTIVITY_HPP */