1 /* Copyright (c) 2006-2020. 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"
12 #include <simgrid/forward.h>
15 #include <xbt/signal.hpp>
17 XBT_LOG_EXTERNAL_CATEGORY(s4u_activity);
24 * This class is the ancestor of every activities that an actor can undertake.
25 * That is, activities are all the things that do take time to the actor in the simulated world.
27 class XBT_PUBLIC Activity {
36 virtual ~Activity() = default;
38 void release_dependencies()
40 while (not successors_.empty()) {
41 ActivityPtr b = successors_.back();
42 XBT_CDEBUG(s4u_activity, "Remove a dependency from '%s' on '%s'", get_cname(), b->get_cname());
43 b->dependencies_.erase(this);
44 if (b->dependencies_.empty()) {
47 successors_.pop_back();
51 void add_successor(ActivityPtr a)
53 successors_.push_back(a);
54 a->dependencies_.insert({this});
60 state_ = State::STARTING;
61 if (dependencies_.empty()) {
62 XBT_CDEBUG(s4u_activity, "All dependencies are solved, let's start '%s'", get_cname());
68 Activity(Activity const&) = delete;
69 Activity& operator=(Activity const&) = delete;
72 enum class State { INITED = 0, STARTING, STARTED, CANCELED,
73 // ERRORED, // FIXME: state has never been used
76 /** Starts a previously created activity.
78 * This function is optional: you can call wait() even if you didn't call start()
80 virtual Activity* start() = 0;
81 /** Blocks until the activity is terminated */
82 virtual Activity* wait() = 0;
83 /** Blocks until the activity is terminated, or until the timeout is elapsed
84 * Raises: timeout exception.*/
85 virtual Activity* wait_for(double timeout) = 0;
86 /** Blocks until the activity is terminated, or until the time limit is reached
87 * Raises: timeout exception. */
88 void wait_until(double time_limit);
90 /** Cancel that activity */
91 virtual Activity* cancel() = 0;
92 /** Retrieve the current state of the activity */
93 Activity::State get_state() const { return state_; }
94 void set_state(Activity::State state) { state_ = state; }
95 /** Tests whether the given activity is terminated yet. */
98 virtual const char* get_cname() const = 0;
99 virtual const std::string& get_name() const = 0;
101 /** Get the remaining amount of work that this Activity entails. When it's 0, it's done. */
102 virtual double get_remaining() const;
103 /** Set the [remaining] amount of work that this Activity will entail
105 * It is forbidden to change the amount of work once the Activity is started */
106 Activity* set_remaining(double remains);
108 /** Returns the internal implementation of this Activity */
109 kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
112 friend void intrusive_ptr_release(Activity* a)
114 if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
115 std::atomic_thread_fence(std::memory_order_acquire);
119 friend void intrusive_ptr_add_ref(Activity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
123 intrusive_ptr_add_ref(this);
126 void unref() { intrusive_ptr_release(this); }
129 kernel::activity::ActivityImplPtr pimpl_ = nullptr;
130 Activity::State state_ = Activity::State::INITED;
132 std::vector<ActivityPtr> successors_;
133 std::set<ActivityPtr> dependencies_;
134 std::atomic_int_fast32_t refcount_{0};
137 template <class AnyActivity> class Activity_T : public Activity {
138 std::string name_ = "unnamed";
139 std::string tracing_category_ = "";
140 void* user_data_ = nullptr;
143 AnyActivity* add_successor(ActivityPtr a)
145 Activity::add_successor(a);
146 return static_cast<AnyActivity*>(this);
149 AnyActivity* set_name(const std::string& name)
151 xbt_assert(get_state() == State::INITED, "Cannot change the name of an activity after its start");
153 return static_cast<AnyActivity*>(this);
155 const std::string& get_name() const override { return name_; }
156 const char* get_cname() const override { return name_.c_str(); }
158 AnyActivity* set_tracing_category(const std::string& category)
160 xbt_assert(get_state() == State::INITED, "Cannot change the tracing category of an activity after its start");
161 tracing_category_ = category;
162 return static_cast<AnyActivity*>(this);
164 const std::string& get_tracing_category() const { return tracing_category_; }
166 AnyActivity* set_user_data(void* data)
169 return static_cast<AnyActivity*>(this);
172 void* get_user_data() const { return user_data_; }
174 /* The refcounting is done in the ancestor class, Activity, but we want each of the classes benefiting of the CRTP
175 * (Exec, Comm, etc) to have smart pointers too, so we define these methods here, that forward the ptr_release and
176 * add_ref to the Activity class. Hopefully, the "inline" helps to not hinder the perf here.
178 friend void inline intrusive_ptr_release(AnyActivity* a) { intrusive_ptr_release(static_cast<Activity*>(a)); }
179 friend void inline intrusive_ptr_add_ref(AnyActivity* a) { intrusive_ptr_add_ref(static_cast<Activity*>(a)); }
184 } // namespace simgrid
186 #endif /* SIMGRID_S4U_ACTIVITY_HPP */