78 lines
3.3 KiB
C++
78 lines
3.3 KiB
C++
/*************************************************************************/
|
|
/* object_rc.h */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/*************************************************************************/
|
|
|
|
#ifndef OBJECTRC_H
|
|
#define OBJECTRC_H
|
|
|
|
#include "core/os/memory.h"
|
|
#include "core/typedefs.h"
|
|
|
|
#include <atomic>
|
|
|
|
class Object;
|
|
|
|
// Used to track Variants pointing to a non-Reference Object
|
|
class ObjectRC {
|
|
std::atomic<Object *> _ptr;
|
|
std::atomic<uint32_t> _users;
|
|
|
|
public:
|
|
// This is for allowing debug builds to check for instance ID validity,
|
|
// so warnings are shown in debug builds when a stray Variant (one pointing
|
|
// to a released Object) would have happened.
|
|
const ObjectID instance_id;
|
|
|
|
_FORCE_INLINE_ void increment() {
|
|
_users.fetch_add(1, std::memory_order_relaxed);
|
|
}
|
|
|
|
_FORCE_INLINE_ bool decrement() {
|
|
return _users.fetch_sub(1, std::memory_order_relaxed) == 1;
|
|
}
|
|
|
|
_FORCE_INLINE_ bool invalidate() {
|
|
_ptr.store(nullptr, std::memory_order_release);
|
|
return decrement();
|
|
}
|
|
|
|
_FORCE_INLINE_ Object *get_ptr() {
|
|
return _ptr.load(std::memory_order_acquire);
|
|
}
|
|
|
|
_FORCE_INLINE_ ObjectRC(Object *p_object) :
|
|
instance_id(p_object->get_instance_id()) {
|
|
// 1 (the Object) + 1 (the first user)
|
|
_users.store(2, std::memory_order_relaxed);
|
|
_ptr.store(p_object, std::memory_order_release);
|
|
}
|
|
};
|
|
|
|
#endif
|