mirror of
https://github.com/cocos/cocos-engine.git
synced 2026-09-08 08:39:35 +08:00
80 lines
3.2 KiB
C++
80 lines
3.2 KiB
C++
/****************************************************************************
|
|
Copyright (c) 2020-2022 Xiamen Yaji Software Co., Ltd.
|
|
|
|
http://www.cocos.com
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated engine source code (the "Software"), a limited,
|
|
worldwide, royalty-free, non-assignable, revocable and non-exclusive license
|
|
to use Cocos Creator solely to develop games on your target platforms. You shall
|
|
not use Cocos Creator software for developing other software or tools that's
|
|
used for developing games. You are not granted to publish, distribute,
|
|
sublicense, and/or sell copies of Cocos Creator.
|
|
|
|
The software or tools in this License Agreement are licensed, not sold.
|
|
Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.
|
|
|
|
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.
|
|
****************************************************************************/
|
|
|
|
#pragma once
|
|
|
|
#include <atomic>
|
|
#include <cstdint>
|
|
#include <cstdlib>
|
|
#include "../memory/Memory.h"
|
|
|
|
namespace cc {
|
|
|
|
// class may be padded
|
|
#if (CC_COMPILER == CC_COMPILER_MSVC)
|
|
#pragma warning(disable : 4324)
|
|
#endif
|
|
|
|
class ALIGNAS(16) ThreadSafeLinearAllocator final {
|
|
public:
|
|
explicit ThreadSafeLinearAllocator(size_t size, size_t alignment = 1) noexcept;
|
|
~ThreadSafeLinearAllocator();
|
|
ThreadSafeLinearAllocator(ThreadSafeLinearAllocator const &) = delete;
|
|
ThreadSafeLinearAllocator(ThreadSafeLinearAllocator &&) = delete;
|
|
ThreadSafeLinearAllocator &operator=(ThreadSafeLinearAllocator const &) = delete;
|
|
ThreadSafeLinearAllocator &operator=(ThreadSafeLinearAllocator &&) = delete;
|
|
|
|
template <typename T>
|
|
inline T *allocate(size_t count, size_t alignment = 1) noexcept {
|
|
return reinterpret_cast<T *>(doAllocate(count * sizeof(T), alignment));
|
|
}
|
|
|
|
inline ptrdiff_t allocateToOffset(size_t size, size_t alignment = 1) noexcept {
|
|
return reinterpret_cast<intptr_t>(doAllocate(size, alignment)) - reinterpret_cast<intptr_t>(_buffer);
|
|
}
|
|
|
|
inline void * getBuffer() const noexcept { return _buffer; }
|
|
inline size_t getCapacity() const noexcept { return _capacity; }
|
|
inline size_t getUsedSize() const noexcept { return _usedSize.load(std::memory_order_relaxed); }
|
|
inline size_t getBalance() const noexcept { return getCapacity() - getUsedSize(); }
|
|
|
|
inline void recycle() noexcept { _usedSize.store(0, std::memory_order_relaxed); }
|
|
|
|
private:
|
|
void *doAllocate(size_t size, size_t alignment) noexcept;
|
|
|
|
void * _buffer{nullptr};
|
|
size_t _capacity{0};
|
|
size_t _alignment{1};
|
|
std::atomic<size_t> _usedSize{0};
|
|
};
|
|
|
|
// class may be padded
|
|
#if (CC_COMPILER == CC_COMPILER_MSVC)
|
|
#pragma warning(default : 4324)
|
|
#endif
|
|
|
|
} // namespace cc
|