public NativeAllocator32(int maxSize, byte maxHeight)
{
_heightGenerator = new SkipList64.SkipListHeightGenerator64(maxHeight);
_maxSize = maxSize;
_pointer = VirtualAlloc(IntPtr.Zero, (UIntPtr)maxSize, AllocationType.MEM_COMMIT | AllocationType.MEM_RESERVE, Protection.PAGE_READWRITE);
if (_pointer == IntPtr.Zero)
{
var error = Marshal.GetLastWin32Error();
throw new OutOfMemoryException($"We could not allocate memory for the skip list error code was {error}");
}
_currentPointer = ALIGNMENTSIZE;
var headNodeSize = SkipListNode32.CalculateSizeNeeded(maxHeight, 0);
AllocateNode(headNodeSize, out var memory);
_ = new SkipListNode32(memory, ALIGNMENTSIZE, maxHeight, Array.Empty <byte>());
}
public ArrayBasedAllocator32(int maxSize, byte maxHeight)
{
_heightGenerator = new SkipList64.SkipListHeightGenerator64(maxHeight);
_maxSize = maxSize;
_data = new byte[maxSize + ALIGNMENTSIZE - 1];
_gcHandle = GCHandle.Alloc(_data, GCHandleType.Pinned);
_initalOffset = (int)(AlignLength(_gcHandle.AddrOfPinnedObject().ToInt64()) - _gcHandle.AddrOfPinnedObject().ToInt64());
if (_initalOffset == 0)
{
_initalOffset += ALIGNMENTSIZE;
}
_currentPointer = _initalOffset;
var headNodeSize = SkipListNode32.CalculateSizeNeeded(maxHeight, 0);
AllocateNode(headNodeSize, out var memory);
_ = new SkipListNode32(memory, ALIGNMENTSIZE, maxHeight, Array.Empty <byte>());
}