You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
2.6 KiB
71 lines
2.6 KiB
/****************************************************************************
|
|
Copyright (c) 2020-2023 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 documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished to do so,
|
|
subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the Software.
|
|
|
|
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.
|
|
****************************************************************************/
|
|
|
|
#include "ThreadSafeLinearAllocator.h"
|
|
#include "acl/core/memory_utils.h"
|
|
#include "base/Macros.h"
|
|
|
|
namespace cc {
|
|
|
|
ThreadSafeLinearAllocator::ThreadSafeLinearAllocator(size_t size, size_t alignment) noexcept
|
|
: _capacity(size), _alignment(alignment) {
|
|
if (alignment == 1) {
|
|
_buffer = CC_MALLOC(size);
|
|
} else {
|
|
_buffer = CC_MALLOC_ALIGN(size, alignment);
|
|
}
|
|
CC_ASSERT(_buffer);
|
|
}
|
|
|
|
ThreadSafeLinearAllocator::~ThreadSafeLinearAllocator() {
|
|
if (_alignment == 1) {
|
|
CC_FREE(_buffer);
|
|
} else {
|
|
CC_FREE_ALIGN(_buffer);
|
|
}
|
|
}
|
|
|
|
void *ThreadSafeLinearAllocator::doAllocate(size_t size, size_t alignment) noexcept {
|
|
if (size == 0) {
|
|
return nullptr;
|
|
}
|
|
|
|
void *allocatedMemory = nullptr;
|
|
size_t oldUsedSize = 0;
|
|
uint64_t newUsedSize = 0; // force 64-bit here to correctly detect overflows
|
|
|
|
do {
|
|
oldUsedSize = getUsedSize();
|
|
allocatedMemory = acl::align_to(acl::add_offset_to_ptr<void>(_buffer, oldUsedSize), alignment);
|
|
newUsedSize = reinterpret_cast<uintptr_t>(allocatedMemory) - reinterpret_cast<uintptr_t>(_buffer) + size;
|
|
|
|
if (newUsedSize > _capacity) {
|
|
return nullptr; // overflows
|
|
}
|
|
} while (!_usedSize.compare_exchange_weak(oldUsedSize, static_cast<size_t>(newUsedSize), std::memory_order_relaxed, std::memory_order_relaxed)); // no ABA possible
|
|
|
|
return allocatedMemory;
|
|
}
|
|
|
|
} // namespace cc
|
|
|