template <class AnyActivity> class Activity_T : public Activity {
private:
- std::string name_ = "";
+ std::string name_ = "unnamed";
std::string tracing_category_ = "";
void* user_data_ = nullptr;
- std::atomic_int_fast32_t refcount_{0};
+ std::vector<Activity*> successors_;
+ std::set<Activity*> 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(Activity* a)
+ {
+ successors_.push_back(a);
+ static_cast<AnyActivity*>(a)->add_dependency_on(static_cast<Activity*>(this));
+ }
+ void remove_successor() { successors_.pop_back(); }
+ Activity* get_successor() { return successors_.back(); }
+ bool has_successors() { return not successors_.empty(); }
+
+ void add_dependency_on(Activity* a) { dependencies_.insert({a}); }
+ void remove_dependency_on(Activity* a) { dependencies_.erase(a); }
+ bool has_dependencies() { return not dependencies_.empty(); }
+ void release_dependencies()
+ {
+ while (has_successors()) {
+ AnyActivity* b = static_cast<AnyActivity*>(get_successor());
+ XBT_CDEBUG(s4u_activity, "Remove a dependency from '%s' on '%s'", static_cast<AnyActivity*>(this)->get_cname(),
+ b->get_cname());
+ b->remove_dependency_on(static_cast<Activity*>(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'",
+ static_cast<AnyActivity*>(this)->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");
