-XBT_ATTRIB_DEPRECATED_v325("Please manifest if you actually need this function")
- XBT_PUBLIC const std::vector<smx_actor_t>& process_get_runnable();
-
-// What's executed as SIMIX actor code:
-typedef std::function<void()> ActorCode;
-
-// Create an ActorCode based on a std::string
-typedef std::function<ActorCode(std::vector<std::string> args)> ActorCodeFactory;
-
-XBT_PUBLIC void register_function(const std::string& name, const ActorCodeFactory& factory);
-
-typedef std::pair<double, Timer*> TimerQelt;
-static boost::heap::fibonacci_heap<TimerQelt, boost::heap::compare<xbt::HeapComparator<TimerQelt>>> simix_timers;
-
-/** @brief Timer datatype */
-class Timer {
- double date = 0.0;
-
-public:
- decltype(simix_timers)::handle_type handle_;
-
- Timer(double date, simgrid::xbt::Task<void()>&& callback) : date(date), callback(std::move(callback)) {}
-
- simgrid::xbt::Task<void()> callback;
- double get_date() { return date; }
- void remove();
-
- template <class F> static inline Timer* set(double date, F callback)
- {
- return set(date, simgrid::xbt::Task<void()>(std::move(callback)));
- }
-
- template <class R, class T>
- XBT_ATTRIB_DEPRECATED_v325("Please use a lambda or std::bind") static inline Timer* set(double date,
- R (*callback)(T*), T* arg)
- {
- return set(date, std::bind(callback, arg));
- }
+/** Use a setter on the `item` object. That's a simcall only if running in parallel or with MC activated.
+ *
+ * Simulation without MC and without parallelism (contexts/nthreads=1) will not pay the price of a simcall for an
+ * harmless setter. When running in parallel, you want your write access to be done in a mutual exclusion way, while the
+ * getters can still occur out of order.
+ *
+ * When running in MC, you want to make this access visible to the checker. Actually in this case, it's not visible from
+ * the checker (and thus still use a fast track) if the setter is called from the actor that created the object.
+ */
+template <class F> typename std::result_of_t<F()> simcall_object_access(ObjectAccessSimcallItem* item, F&& code)
+{
+ // If we are in the maestro, we take the fast path and execute the code directly
+ if (simgrid::s4u::Actor::is_maestro())
+ return std::forward<F>(code)();