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78 lines
3.0 KiB
78 lines
3.0 KiB
/****************************************************************************
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Copyright (c) 2020-2023 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#pragma once
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#include <atomic>
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#include <cstdint>
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#include <cstdlib>
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#include "../memory/Memory.h"
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namespace cc {
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// class may be padded
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#if (CC_COMPILER == CC_COMPILER_MSVC)
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#pragma warning(disable : 4324)
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#endif
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class ALIGNAS(16) ThreadSafeLinearAllocator final {
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public:
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explicit ThreadSafeLinearAllocator(size_t size, size_t alignment = 1) noexcept;
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~ThreadSafeLinearAllocator();
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ThreadSafeLinearAllocator(ThreadSafeLinearAllocator const &) = delete;
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ThreadSafeLinearAllocator(ThreadSafeLinearAllocator &&) = delete;
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ThreadSafeLinearAllocator &operator=(ThreadSafeLinearAllocator const &) = delete;
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ThreadSafeLinearAllocator &operator=(ThreadSafeLinearAllocator &&) = delete;
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template <typename T>
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inline T *allocate(size_t count, size_t alignment = 1) noexcept {
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return reinterpret_cast<T *>(doAllocate(count * sizeof(T), alignment));
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}
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inline std::ptrdiff_t allocateToOffset(size_t size, size_t alignment = 1) noexcept {
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return reinterpret_cast<intptr_t>(doAllocate(size, alignment)) - reinterpret_cast<intptr_t>(_buffer);
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}
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inline void *getBuffer() const noexcept { return _buffer; }
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inline size_t getCapacity() const noexcept { return _capacity; }
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inline size_t getUsedSize() const noexcept { return _usedSize.load(std::memory_order_relaxed); }
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inline size_t getBalance() const noexcept { return getCapacity() - getUsedSize(); }
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inline void recycle() noexcept { _usedSize.store(0, std::memory_order_relaxed); }
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private:
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void *doAllocate(size_t size, size_t alignment) noexcept;
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void *_buffer{nullptr};
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size_t _capacity{0};
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size_t _alignment{1};
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std::atomic<size_t> _usedSize{0};
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};
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// class may be padded
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#if (CC_COMPILER == CC_COMPILER_MSVC)
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#pragma warning(default : 4324)
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#endif
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} // namespace cc
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