54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
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// This file is part of Blend2D project <https://blend2d.com>
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//
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// See blend2d.h or LICENSE.md for license and copyright information
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// SPDX-License-Identifier: Zlib
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#ifndef BLEND2D_API_IMPL_H_INCLUDED
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#define BLEND2D_API_IMPL_H_INCLUDED
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#include "api.h"
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#include "object.h"
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#include <atomic>
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//! \addtogroup blend2d_api_impl
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//! \{
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//! \name Atomic Operations
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//!
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//! Atomic operations are used extensively across Blend2D for reference counting and caching. You should always
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//! use operations defined here as they implement all possible cases that Blend2D deals with in a correct way
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//! (and if there is a bug it makes it fixable in a single place).
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//!
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//! \{
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//! Atomically increments `n` to value `x` (relaxed semantics). The old value is returned.
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template<typename T>
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static BL_INLINE T blAtomicFetchAddRelaxed(T* x, T n = T(1)) noexcept {
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return ((std::atomic<T>*)x)->fetch_add(n, std::memory_order_relaxed);
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}
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//! Atomically increments `n` to value `x` (strong semantics). The old value is returned.
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template<typename T>
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static BL_INLINE T blAtomicFetchAddStrong(T* x, T n = T(1)) noexcept {
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return ((std::atomic<T>*)x)->fetch_add(n, std::memory_order_acq_rel);
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}
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//! Atomically decrements `n` from value `x` (relaxed semantics). The old value is returned.
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template<typename T>
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static BL_INLINE T blAtomicFetchSubRelaxed(T* x, T n = T(1)) noexcept {
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return ((std::atomic<T>*)x)->fetch_sub(n, std::memory_order_relaxed);
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}
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//! Atomically decrements `n` from value `x` (strong semantics). The old value is returned.
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template<typename T>
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static BL_INLINE T blAtomicFetchSubStrong(T* x, T n = T(1)) noexcept {
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return ((std::atomic<T>*)x)->fetch_sub(n, std::memory_order_acq_rel);
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}
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//! \}
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//! \}
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#endif // BLEND2D_API_IMPL_H_INCLUDED
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