/// <summary>
/// This object cannot be instantiated outside of the static Create method
/// </summary>
protected MemoryPoolBlock(MemoryPool pool, MemoryPoolSlab slab, int offset, int length)
{
_offset = offset;
_length = length;
Pool = pool;
Slab = slab;
}
/// <summary>
/// This object cannot be instantiated outside of the static Create method
/// </summary>
protected MemoryPoolBlock(MemoryPool pool, MemoryPoolSlab slab, int offset, int length) : base(slab.Array, offset, length, slab.NativePointer + offset)
{
_offset = offset;
_length = length;
Pool = pool;
Slab = slab;
}
internal static MemoryPoolBlock Create(
int offset,
int length,
MemoryPool pool,
MemoryPoolSlab slab)
{
return(new MemoryPoolBlock(pool, slab, offset, length));
}
internal static MemoryPoolBlock Create(
int offset,
int length,
MemoryPool pool,
MemoryPoolSlab slab)
{
return(new MemoryPoolBlock(pool, slab, offset, length)
{
#if BLOCK_LEASE_TRACKING
Leaser = Environment.StackTrace,
#endif
});
}
/// <summary>
/// Internal method called when a block is requested and the pool is empty. It allocates one additional slab, creates all of the
/// block tracking objects, and adds them all to the pool.
/// </summary>
private MemoryPoolBlock AllocateSlab()
{
var slab = MemoryPoolSlab.Create(_slabLength);
_slabs.Push(slab);
_slabAllocationCallback?.Invoke(slab);
slab._deallocationCallback = _slabDeallocationCallback;
var basePtr = slab.NativePointer;
var firstOffset = (int)((_blockStride - 1) - ((ulong)(basePtr + _blockStride - 1) % _blockStride));
var poolAllocationLength = _slabLength - _blockStride;
var offset = firstOffset;
for (;
offset + _blockLength < poolAllocationLength;
offset += _blockStride)
{
var block = MemoryPoolBlock.Create(
offset,
_blockLength,
this,
slab);
#if DEBUG
block.IsLeased = true;
#endif
Return(block);
}
// return last block rather than adding to pool
var newBlock = MemoryPoolBlock.Create(
offset,
_blockLength,
this,
slab);
return(newBlock);
}