+extern unsigned stack_size;
+extern unsigned guard_size;
+
+class XBT_PUBLIC ContextFactory {
+public:
+ explicit ContextFactory() = default;
+ ContextFactory(const ContextFactory&) = delete;
+ ContextFactory& operator=(const ContextFactory&) = delete;
+ virtual ~ContextFactory();
+ virtual Context* create_context(std::function<void()>&& code, actor::ActorImpl* actor) = 0;
+
+ /** Turn the current thread into a simulation context */
+ virtual Context* attach(actor::ActorImpl* actor);
+ /** Turn the current thread into maestro (the old maestro becomes a regular actor) */
+ virtual Context* create_maestro(std::function<void()>&& code, actor::ActorImpl* actor);
+
+ virtual void run_all() = 0;
+
+protected:
+ template <class T, class... Args> T* new_context(Args&&... args)
+ {
+ auto* context = new T(std::forward<Args>(args)...);
+ context->declare_context(sizeof(T));
+ return context;
+ }
+};
+
+class XBT_PUBLIC Context {
+ friend ContextFactory;
+
+ static thread_local Context* current_context_;
+
+ std::function<void()> code_;
+ actor::ActorImpl* actor_ = nullptr;
+ bool iwannadie_ = false;
+ bool is_maestro_;
+ void declare_context(std::size_t size);
+
+public:
+#ifndef WIN32
+ static int install_sigsegv_stack(stack_t* old_stack, bool enable);
+#endif
+
+ Context(std::function<void()>&& code, actor::ActorImpl* actor, bool maestro);
+ Context(const Context&) = delete;
+ Context& operator=(const Context&) = delete;
+ virtual ~Context();
+
+ bool wannadie() const { return iwannadie_; }
+ void set_wannadie(bool value = true) { iwannadie_ = value; }
+ bool is_maestro() const { return is_maestro_; }
+ void operator()() const { code_(); }
+ bool has_code() const { return static_cast<bool>(code_); }
+ actor::ActorImpl* get_actor() const { return this->actor_; }
+
+ // Scheduling methods
+ virtual void stop();
+ virtual void suspend() = 0;
+
+ // Retrieving the self() context
+ /** @brief Retrieves the current context of this thread */
+ static Context* self();
+ /** @brief Sets the current context of this thread */
+ static void set_current(Context* self);
+};
+
+class XBT_PUBLIC AttachContext : public Context {
+public:
+ AttachContext(std::function<void()>&& code, actor::ActorImpl* actor, bool maestro)
+ : Context(std::move(code), actor, maestro)
+ {
+ }
+ AttachContext(const AttachContext&) = delete;
+ AttachContext& operator=(const AttachContext&) = delete;
+ ~AttachContext() override;
+
+ /** Called by the context when it is ready to give control to the maestro */
+ virtual void attach_start() = 0;
+
+ /** Called by the context when it has finished its job */
+ virtual void attach_stop() = 0;
+};