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-rw-r--r--core/safe_refcount.h203
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diff --git a/core/safe_refcount.h b/core/safe_refcount.h
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-/*************************************************************************/
-/* safe_refcount.h */
-/*************************************************************************/
-/* This file is part of: */
-/* GODOT ENGINE */
-/* https://godotengine.org */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
-/* Copyright (c) 2014-2020 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 SAFE_REFCOUNT_H
-#define SAFE_REFCOUNT_H
-
-#include "core/os/mutex.h"
-#include "core/typedefs.h"
-#include "platform_config.h"
-
-// Atomic functions, these are used for multithread safe reference counters!
-
-#ifdef NO_THREADS
-
-/* Bogus implementation unaware of multiprocessing */
-
-template <class T>
-static _ALWAYS_INLINE_ T atomic_conditional_increment(volatile T *pw) {
- if (*pw == 0) {
- return 0;
- }
-
- (*pw)++;
-
- return *pw;
-}
-
-template <class T>
-static _ALWAYS_INLINE_ T atomic_decrement(volatile T *pw) {
- (*pw)--;
-
- return *pw;
-}
-
-template <class T>
-static _ALWAYS_INLINE_ T atomic_increment(volatile T *pw) {
- (*pw)++;
-
- return *pw;
-}
-
-template <class T, class V>
-static _ALWAYS_INLINE_ T atomic_sub(volatile T *pw, volatile V val) {
- (*pw) -= val;
-
- return *pw;
-}
-
-template <class T, class V>
-static _ALWAYS_INLINE_ T atomic_add(volatile T *pw, volatile V val) {
- (*pw) += val;
-
- return *pw;
-}
-
-template <class T, class V>
-static _ALWAYS_INLINE_ T atomic_exchange_if_greater(volatile T *pw, volatile V val) {
- if (val > *pw) {
- *pw = val;
- }
-
- return *pw;
-}
-
-#elif defined(__GNUC__)
-
-/* Implementation for GCC & Clang */
-
-// GCC guarantees atomic intrinsics for sizes of 1, 2, 4 and 8 bytes.
-// Clang states it supports GCC atomic builtins.
-
-template <class T>
-static _ALWAYS_INLINE_ T atomic_conditional_increment(volatile T *pw) {
- while (true) {
- T tmp = static_cast<T const volatile &>(*pw);
- if (tmp == 0) {
- return 0; // if zero, can't add to it anymore
- }
- if (__sync_val_compare_and_swap(pw, tmp, tmp + 1) == tmp) {
- return tmp + 1;
- }
- }
-}
-
-template <class T>
-static _ALWAYS_INLINE_ T atomic_decrement(volatile T *pw) {
- return __sync_sub_and_fetch(pw, 1);
-}
-
-template <class T>
-static _ALWAYS_INLINE_ T atomic_increment(volatile T *pw) {
- return __sync_add_and_fetch(pw, 1);
-}
-
-template <class T, class V>
-static _ALWAYS_INLINE_ T atomic_sub(volatile T *pw, volatile V val) {
- return __sync_sub_and_fetch(pw, val);
-}
-
-template <class T, class V>
-static _ALWAYS_INLINE_ T atomic_add(volatile T *pw, volatile V val) {
- return __sync_add_and_fetch(pw, val);
-}
-
-template <class T, class V>
-static _ALWAYS_INLINE_ T atomic_exchange_if_greater(volatile T *pw, volatile V val) {
- while (true) {
- T tmp = static_cast<T const volatile &>(*pw);
- if (tmp >= val) {
- return tmp; // already greater, or equal
- }
- if (__sync_val_compare_and_swap(pw, tmp, val) == tmp) {
- return val;
- }
- }
-}
-
-#elif defined(_MSC_VER)
-// For MSVC use a separate compilation unit to prevent windows.h from polluting
-// the global namespace.
-uint32_t atomic_conditional_increment(volatile uint32_t *pw);
-uint32_t atomic_decrement(volatile uint32_t *pw);
-uint32_t atomic_increment(volatile uint32_t *pw);
-uint32_t atomic_sub(volatile uint32_t *pw, volatile uint32_t val);
-uint32_t atomic_add(volatile uint32_t *pw, volatile uint32_t val);
-uint32_t atomic_exchange_if_greater(volatile uint32_t *pw, volatile uint32_t val);
-
-uint64_t atomic_conditional_increment(volatile uint64_t *pw);
-uint64_t atomic_decrement(volatile uint64_t *pw);
-uint64_t atomic_increment(volatile uint64_t *pw);
-uint64_t atomic_sub(volatile uint64_t *pw, volatile uint64_t val);
-uint64_t atomic_add(volatile uint64_t *pw, volatile uint64_t val);
-uint64_t atomic_exchange_if_greater(volatile uint64_t *pw, volatile uint64_t val);
-
-#else
-//no threads supported?
-#error Must provide atomic functions for this platform or compiler!
-#endif
-
-struct SafeRefCount {
- uint32_t count;
-
-public:
- // destroy() is called when weak_count_ drops to zero.
-
- _ALWAYS_INLINE_ bool ref() { // true on success
-
- return atomic_conditional_increment(&count) != 0;
- }
-
- _ALWAYS_INLINE_ uint32_t refval() { // none-zero on success
-
- return atomic_conditional_increment(&count);
- }
-
- _ALWAYS_INLINE_ bool unref() { // true if must be disposed of
-
- return atomic_decrement(&count) == 0;
- }
-
- _ALWAYS_INLINE_ uint32_t unrefval() { // 0 if must be disposed of
-
- return atomic_decrement(&count);
- }
-
- _ALWAYS_INLINE_ uint32_t get() const { // nothrow
-
- return count;
- }
-
- _ALWAYS_INLINE_ void init(uint32_t p_value = 1) {
- count = p_value;
- }
-};
-
-#endif // SAFE_REFCOUNT_H
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