Struct PoolAllocator 

pub struct PoolAllocator { /* private fields */ }

Implementations

impl PoolAllocator

pub fn number_of_buckets(&self) -> u32

pub fn bucket_size(&self) -> usize

pub fn size(&self) -> usize

pub fn start_address(&self) -> usize

pub fn max_alignment(&self) -> usize

pub unsafe fn deallocate_bucket(&self, ptr: NonNull<u8>)

Releases an previously allocated bucket of memory.

Safety

• ptr must be allocated previously with PoolAllocator::allocate() or PoolAllocator::allocate_zeroed()

pub unsafe fn new_uninit( bucket_layout: Layout, ptr: NonNull<u8>, size: usize, ) -> Self

Safety

• ptr must point to a piece of memory of length size
• before any other method can be called PoolAllocator::init() must be called once

pub unsafe fn init<Allocator: BaseAllocator>( &mut self, allocator: &Allocator, ) -> Result<(), AllocationError>

Safety

• must be called exactly once before any other method can be called

pub fn memory_size(bucket_layout: Layout, size: usize) -> usize

Trait Implementations

impl Allocator for PoolAllocator

unsafe fn grow( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocationGrowError>

always returns the input ptr on success but with an increased size

unsafe fn shrink( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocationShrinkError>

Decreases the size of an previously allocated chunk of memory. If the size increases it fails.

unsafe fn grow_zeroed( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocationGrowError>

Increases the size of an previously allocated chunk of memory or allocates a new chunk with the provided properties. If the chunk can be resized only the difference in size will be zeroed. It returns a failure when the size decreases.

impl BaseAllocator for PoolAllocator

fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocationError>

Allocates a memory chunk with the properties provided in layout and either returns a slice or an allocation error on failure.

unsafe fn deallocate(&self, ptr: NonNull<u8>, _layout: Layout)

Releases an previously allocated chunk of memory.

fn allocate_zeroed( &self, layout: Layout, ) -> Result<NonNull<[u8]>, AllocationError>

Allocates a memory chunk with the properties provided in layout and zeroes the memory On success it returns a slice or an allocation error on failure.

impl Debug for PoolAllocator

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.