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Modernize atomics
- Based on C++11's `atomic` - Reworked `SafeRefCount` (based on the rewrite by @hpvb) - Replaced free atomic functions by the new `SafeNumeric<T>` - Replaced wrong cases of `volatile` by the new `SafeFlag` - Platform-specific implementations no longer needed Co-authored-by: Hein-Pieter van Braam-Stewart <hp@tmm.cx>
This commit is contained in:
Pedro J. Estébanez
@@ -1,169 +0,0 @@
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/*************************************************************************/
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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) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 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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