+ kernel::activity::ActivityImplPtr pimpl_ = nullptr;
+ Activity::State state_ = Activity::State::INITED;
+ double remains_ = 0;
+};
+
+template <class AnyActivity> class Activity_T : public Activity {
+private:
+ std::string name_ = "unnamed";
+ std::string tracing_category_ = "";
+ void* user_data_ = nullptr;
+ std::atomic_int_fast32_t refcount_{0};
+ std::vector<AnyActivity*> successors_;
+ std::set<AnyActivity*> dependencies_;
+
+public:
+#ifndef DOXYGEN
+ friend void intrusive_ptr_release(AnyActivity* a)
+ {
+ if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
+ std::atomic_thread_fence(std::memory_order_acquire);
+ delete a;
+ }
+ }
+ friend void intrusive_ptr_add_ref(AnyActivity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
+#endif
+
+ void add_successor(AnyActivity* a)
+ {
+ successors_.push_back(a);
+ a->add_dependency_on(static_cast<AnyActivity*>(this));
+ }
+ void remove_successor() { successors_.pop_back(); }
+ AnyActivity* get_successor() { return successors_.back(); }
+ bool has_successors() { return not successors_.empty(); }
+
+ void add_dependency_on(AnyActivity* a) { dependencies_.insert({a}); }
+ void remove_dependency_on(AnyActivity* a) { dependencies_.erase(a); }
+ bool has_dependencies() { return not dependencies_.empty(); }
+ void release_dependencies()
+ {
+ while (has_successors()) {
+ AnyActivity* b = get_successor();
+ XBT_CDEBUG(s4u_activity, "Remove a dependency from '%s' on '%s'", get_cname(), b->get_cname());
+ b->remove_dependency_on(static_cast<AnyActivity*>(this));
+ if (not b->has_dependencies()) {
+ b->vetoable_start();
+ }
+ remove_successor();
+ }
+ }
+
+ AnyActivity* vetoable_start()
+ {
+ set_state(State::STARTING);
+ if (has_dependencies())
+ return static_cast<AnyActivity*>(this);
+ set_state(State::STARTED);
+ XBT_CDEBUG(s4u_activity, "All dependencies are solved, let's start '%s'", get_cname());
+ static_cast<AnyActivity*>(this)->start();
+ return static_cast<AnyActivity*>(this);
+ }
+
+ AnyActivity* set_name(const std::string& name)
+ {
+ xbt_assert(get_state() == State::INITED, "Cannot change the name of an activity after its start");
+ name_ = name;
+ return static_cast<AnyActivity*>(this);
+ }
+ const std::string& get_name() { return name_; }
+ const char* get_cname() { return name_.c_str(); }
+
+ AnyActivity* set_tracing_category(const std::string& category)
+ {
+ xbt_assert(get_state() == State::INITED, "Cannot change the tracing category of an activity after its start");
+ tracing_category_ = category;
+ return static_cast<AnyActivity*>(this);
+ }
+ const std::string& get_tracing_category() { return tracing_category_; }
+
+ AnyActivity* set_user_data(void* data)
+ {
+ user_data_ = data;
+ return static_cast<AnyActivity*>(this);
+ }
+
+ void* get_user_data() { return user_data_; }
+};