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});
58 kernel::activity::ActivityImpl* get_impl() { return pimpl_.get(); }
61 state_ = State::STARTING;
62 if (dependencies_.empty()) {
63 XBT_CDEBUG(s4u_activity, "All dependencies are solved, let's start '%s'", get_cname());
69 Activity(Activity const&) = delete;
70 Activity& operator=(Activity const&) = delete;
73 enum class State { INITED = 0, STARTING, STARTED, CANCELED, ERRORED, FINISHED };
75 /** Starts a previously created activity.
77 * This function is optional: you can call wait() even if you didn't call start()
79 virtual Activity* start() = 0;
80 /** Blocks until the activity is terminated */
81 virtual Activity* wait() = 0;
82 /** Blocks until the activity is terminated, or until the timeout is elapsed
83 * Raises: timeout exception.*/
84 virtual Activity* wait_for(double timeout) = 0;
85 /** Blocks until the activity is terminated, or until the time limit is reached
86 * Raises: timeout exception. */
87 void wait_until(double time_limit);
89 /** Cancel that activity */
90 virtual Activity* cancel() = 0;
91 /** Retrieve the current state of the activity */
92 Activity::State get_state() { return state_; }
93 void set_state(Activity::State state) { state_ = state; }
94 /** Tests whether the given activity is terminated yet. This is a pure function. */
95 virtual bool test() = 0;
96 virtual const char* get_cname() = 0;
97 virtual const std::string& get_name() = 0;
99 /** Get the remaining amount of work that this Activity entails. When it's 0, it's done. */
100 virtual double get_remaining();
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);
106 /** Returns the internal implementation of this Activity */
107 kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
110 friend void intrusive_ptr_release(Activity* a)
112 if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
113 std::atomic_thread_fence(std::memory_order_acquire);
117 friend void intrusive_ptr_add_ref(Activity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
121 intrusive_ptr_add_ref(this);
126 intrusive_ptr_release(this);
131 kernel::activity::ActivityImplPtr pimpl_ = nullptr;
132 Activity::State state_ = Activity::State::INITED;
134 std::vector<ActivityPtr> successors_;
135 std::set<ActivityPtr> dependencies_;
136 std::atomic_int_fast32_t refcount_{0};
139 template <class AnyActivity> class Activity_T : public Activity {
140 std::string name_ = "unnamed";
141 std::string tracing_category_ = "";
142 void* user_data_ = nullptr;
145 AnyActivity* add_successor(ActivityPtr a)
147 Activity::add_successor(a);
148 return static_cast<AnyActivity*>(this);
151 AnyActivity* set_name(const std::string& name)
153 xbt_assert(get_state() == State::INITED, "Cannot change the name of an activity after its start");
155 return static_cast<AnyActivity*>(this);
157 const std::string& get_name() { return name_; }
158 const char* get_cname() { return name_.c_str(); }
160 AnyActivity* set_tracing_category(const std::string& category)
162 xbt_assert(get_state() == State::INITED, "Cannot change the tracing category of an activity after its start");
163 tracing_category_ = category;
164 return static_cast<AnyActivity*>(this);
166 const std::string& get_tracing_category() { return tracing_category_; }
168 AnyActivity* set_user_data(void* data)
171 return static_cast<AnyActivity*>(this);
174 void* get_user_data() { return user_data_; }
176 /* The refcounting is done in the ancestor class, Activity, but we want each of the classes benefiting of the CRTP
177 * (Exec, Comm, etc) to have smart pointers too, so we define these methods here, that forward the ptr_release and
178 * add_ref to the Activity class. Hopefully, the "inline" helps to not hinder the perf here.
180 friend void inline intrusive_ptr_release(AnyActivity* a) { intrusive_ptr_release(static_cast<Activity*>(a)); }
181 friend void inline intrusive_ptr_add_ref(AnyActivity* a) { intrusive_ptr_add_ref(static_cast<Activity*>(a)); }
186 } // namespace simgrid
188 #endif /* SIMGRID_S4U_ACTIVITY_HPP */