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Happy new year to the wonderful Godot community! We're starting a new decade with a well-established, non-profit, free and open source game engine, and tons of further improvements in the pipeline from hundreds of contributors. Godot will keep getting better, and we're looking forward to all the games that the community will keep developing and releasing with it.
170 lines
6.8 KiB
C++
170 lines
6.8 KiB
C++
/*************************************************************************/
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/* safe_refcount.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "safe_refcount.h"
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#if defined(_MSC_VER)
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/* Implementation for MSVC-Windows */
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// don't pollute my namespace!
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#include <windows.h>
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#define ATOMIC_CONDITIONAL_INCREMENT_BODY(m_pw, m_win_type, m_win_cmpxchg, m_cpp_type) \
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/* try to increment until it actually works */ \
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/* taken from boost */ \
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while (true) { \
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m_cpp_type tmp = static_cast<m_cpp_type const volatile &>(*(m_pw)); \
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if (tmp == 0) \
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return 0; /* if zero, can't add to it anymore */ \
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if (m_win_cmpxchg((m_win_type volatile *)(m_pw), tmp + 1, tmp) == tmp) \
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return tmp + 1; \
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}
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#define ATOMIC_EXCHANGE_IF_GREATER_BODY(m_pw, m_val, m_win_type, m_win_cmpxchg, m_cpp_type) \
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while (true) { \
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m_cpp_type tmp = static_cast<m_cpp_type const volatile &>(*(m_pw)); \
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if (tmp >= m_val) \
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return tmp; /* already greater, or equal */ \
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if (m_win_cmpxchg((m_win_type volatile *)(m_pw), m_val, tmp) == tmp) \
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return m_val; \
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}
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_ALWAYS_INLINE_ uint32_t _atomic_conditional_increment_impl(volatile uint32_t *pw){
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ATOMIC_CONDITIONAL_INCREMENT_BODY(pw, LONG, InterlockedCompareExchange, uint32_t)
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}
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_ALWAYS_INLINE_ uint32_t _atomic_decrement_impl(volatile uint32_t *pw) {
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return InterlockedDecrement((LONG volatile *)pw);
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}
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_ALWAYS_INLINE_ uint32_t _atomic_increment_impl(volatile uint32_t *pw) {
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return InterlockedIncrement((LONG volatile *)pw);
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}
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_ALWAYS_INLINE_ uint32_t _atomic_sub_impl(volatile uint32_t *pw, volatile uint32_t val) {
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return InterlockedExchangeAdd((LONG volatile *)pw, -(int32_t)val) - val;
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}
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_ALWAYS_INLINE_ uint32_t _atomic_add_impl(volatile uint32_t *pw, volatile uint32_t val) {
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return InterlockedAdd((LONG volatile *)pw, val);
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}
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_ALWAYS_INLINE_ uint32_t _atomic_exchange_if_greater_impl(volatile uint32_t *pw, volatile uint32_t val){
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ATOMIC_EXCHANGE_IF_GREATER_BODY(pw, val, LONG, InterlockedCompareExchange, uint32_t)
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}
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_ALWAYS_INLINE_ uint64_t _atomic_conditional_increment_impl(volatile uint64_t *pw){
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ATOMIC_CONDITIONAL_INCREMENT_BODY(pw, LONGLONG, InterlockedCompareExchange64, uint64_t)
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}
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_ALWAYS_INLINE_ uint64_t _atomic_decrement_impl(volatile uint64_t *pw) {
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return InterlockedDecrement64((LONGLONG volatile *)pw);
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}
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_ALWAYS_INLINE_ uint64_t _atomic_increment_impl(volatile uint64_t *pw) {
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return InterlockedIncrement64((LONGLONG volatile *)pw);
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}
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_ALWAYS_INLINE_ uint64_t _atomic_sub_impl(volatile uint64_t *pw, volatile uint64_t val) {
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return InterlockedExchangeAdd64((LONGLONG volatile *)pw, -(int64_t)val) - val;
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}
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_ALWAYS_INLINE_ uint64_t _atomic_add_impl(volatile uint64_t *pw, volatile uint64_t val) {
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return InterlockedAdd64((LONGLONG volatile *)pw, val);
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}
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_ALWAYS_INLINE_ uint64_t _atomic_exchange_if_greater_impl(volatile uint64_t *pw, volatile uint64_t val){
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ATOMIC_EXCHANGE_IF_GREATER_BODY(pw, val, LONGLONG, InterlockedCompareExchange64, uint64_t)
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}
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// The actual advertised functions; they'll call the right implementation
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uint32_t atomic_conditional_increment(volatile uint32_t *pw) {
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return _atomic_conditional_increment_impl(pw);
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}
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uint32_t atomic_decrement(volatile uint32_t *pw) {
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return _atomic_decrement_impl(pw);
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}
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uint32_t atomic_increment(volatile uint32_t *pw) {
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return _atomic_increment_impl(pw);
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}
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uint32_t atomic_sub(volatile uint32_t *pw, volatile uint32_t val) {
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return _atomic_sub_impl(pw, val);
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}
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uint32_t atomic_add(volatile uint32_t *pw, volatile uint32_t val) {
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return _atomic_add_impl(pw, val);
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}
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uint32_t atomic_exchange_if_greater(volatile uint32_t *pw, volatile uint32_t val) {
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return _atomic_exchange_if_greater_impl(pw, val);
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}
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uint64_t atomic_conditional_increment(volatile uint64_t *pw) {
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return _atomic_conditional_increment_impl(pw);
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}
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uint64_t atomic_decrement(volatile uint64_t *pw) {
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return _atomic_decrement_impl(pw);
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}
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uint64_t atomic_increment(volatile uint64_t *pw) {
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return _atomic_increment_impl(pw);
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}
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uint64_t atomic_sub(volatile uint64_t *pw, volatile uint64_t val) {
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return _atomic_sub_impl(pw, val);
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}
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uint64_t atomic_add(volatile uint64_t *pw, volatile uint64_t val) {
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return _atomic_add_impl(pw, val);
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}
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uint64_t atomic_exchange_if_greater(volatile uint64_t *pw, volatile uint64_t val) {
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return _atomic_exchange_if_greater_impl(pw, val);
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}
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#endif
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