/// <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);
var basePtr = slab.NativePointer;
// Page align the blocks
var firstOffset = (int)((((ulong)basePtr + (uint)_blockSize - 1) & ~((uint)_blockSize - 1)) - (ulong)basePtr);
// Ensure page aligned
Debug.Assert((((ulong)basePtr + (uint)firstOffset) & (uint)(_blockSize - 1)) == 0);
var blockAllocationLength = ((_slabLength - firstOffset) & ~(_blockSize - 1));
var offset = firstOffset;
for (;
offset + _blockSize < blockAllocationLength;
offset += _blockSize)
{
var block = MemoryPoolBlock.Create(
offset,
_blockSize,
this,
slab);
#if BLOCK_LEASE_TRACKING
block.IsLeased = true;
#endif
Return(block);
}
Debug.Assert(offset + _blockSize - firstOffset == blockAllocationLength);
// return last block rather than adding to pool
var newBlock = MemoryPoolBlock.Create(
offset,
_blockSize,
this,
slab);
return(newBlock);
}
/// <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 BLOCK_LEASE_TRACKING
block.IsLeased = true;
#endif
Return(block);
}
// return last block rather than adding to pool
var newBlock = MemoryPoolBlock.Create(
offset,
_blockLength,
this,
slab);
return(newBlock);
}
