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e1c240f2d0
* gfx: CommandBuffer.draw accept DrawInfo * clang-tidy config * tidy adapt * enable function name check * better workflow
63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
/****************************************************************************
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Copyright (c) 2020-2021 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 engine source code (the "Software"), a limited,
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worldwide, royalty-free, non-assignable, revocable and non-exclusive license
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to use Cocos Creator solely to develop games on your target platforms. You shall
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not use Cocos Creator software for developing other software or tools that's
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used for developing games. You are not granted to publish, distribute,
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sublicense, and/or sell copies of Cocos Creator.
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The software or tools in this License Agreement are licensed, not sold.
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Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.
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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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#include "ThreadSafeLinearAllocator.h"
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#include "acl/core/memory_utils.h"
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namespace cc {
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ThreadSafeLinearAllocator::ThreadSafeLinearAllocator(uint32_t size) noexcept
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: _capacity(size) {
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_buffer = malloc(size);
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}
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ThreadSafeLinearAllocator::~ThreadSafeLinearAllocator() {
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free(_buffer);
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}
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void *ThreadSafeLinearAllocator::allocate(size_t size, size_t alignment) noexcept {
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if (size == 0) {
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return nullptr;
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}
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void * allocatedMemory = nullptr;
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uint32_t oldUsedSize = 0;
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uint64_t newUsedSize = 0; // using 64-bit integer to correctly detect overflows
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do {
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oldUsedSize = getUsedSize();
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allocatedMemory = acl::align_to(acl::add_offset_to_ptr<void>(_buffer, oldUsedSize), alignment);
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newUsedSize = reinterpret_cast<uintptr_t>(allocatedMemory) - reinterpret_cast<uintptr_t>(_buffer) + size;
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if (newUsedSize > _capacity) {
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return nullptr; // overflows
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}
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} while (!_usedSize.compare_exchange_weak(oldUsedSize, static_cast<uint32_t>(newUsedSize), std::memory_order_relaxed, std::memory_order_relaxed)); // no ABA possible
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return allocatedMemory;
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}
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} // namespace cc
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