Struct SharedBumpArena 

pub struct SharedBumpArena<B: FixedRange> { /* private fields */ }

Atomic-cursor bump arena.

Sound under multi-thread &self allocation: the cursor uses a compare_exchange_weak CAS loop to handle alignment rounding atomically.

Implementations

impl<B: FixedRange> SharedBumpArena<B>

pub fn new(backing: B) -> Result<Self, AllocError>

Construct a shared bump arena.

Errors if the backing reports a zero-byte range.

pub fn allocated(&self) -> usize

Bytes currently allocated.

pub fn capacity(&self) -> usize

Total capacity in bytes.

pub fn remaining(&self) -> usize

Bytes remaining.

Trait Implementations

impl<B: FixedRange> Allocator for SharedBumpArena<B>

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

Allocate a block satisfying layout. The returned slice’s length is at least layout.size() but may be larger.

fn capacity_bytes(&self) -> Option<usize>

Total bytes this allocator can issue, if bounded. None for unbounded allocators like System. Used by Watermark to compute thresholds.

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

Allocate a zero-initialized block.

unsafe fn grow( &self, ptr: NonNull<u8>, old: NonZeroLayout, new: NonZeroLayout, ) -> Result<NonNull<[u8]>, AllocError>

Grow an allocation in place if possible, otherwise allocate-copy-free.

unsafe fn shrink( &self, ptr: NonNull<u8>, old: NonZeroLayout, new: NonZeroLayout, ) -> Result<NonNull<[u8]>, AllocError>

Shrink an allocation in place if possible, otherwise allocate-copy-free.

fn reset(&mut self) -> Result<(), AllocError>

Reclaim everything previously allocated. Default impl returns AllocError — only arena-style allocators implement a meaningful reset.

unsafe fn usable_size( &self, _ptr: NonNull<u8>, _layout: NonZeroLayout, ) -> Option<usize>

Usable size of an existing allocation, if the allocator can report it. Defaults to None — implementors that track usable size override.

fn corruption_events(&self) -> u64

Detected freelist / metadata corruption events observed by this allocator since construction.

impl<B: FixedRange> Deallocator for SharedBumpArena<B>

unsafe fn deallocate(&self, _ptr: NonNull<u8>, _layout: NonZeroLayout)

Release a previously allocated block.

impl<B: FixedRange> FixedRange for SharedBumpArena<B>

fn base(&self) -> NonNull<u8>

First byte of the owned address range.

fn size(&self) -> usize

Length in bytes of the owned address range.

fn commit(&self, offset: usize, len: usize) -> Result<(), AllocError>

Ensure the bytes [offset, offset + len) (relative to base) are backed by committed, writable memory before a consumer writes through them.

fn contains(&self, ptr: NonNull<u8>) -> bool

Whether ptr lies within [base, base + size).

impl<B: FixedRange + Send> Send for SharedBumpArena<B>

impl<B: FixedRange + Send> Sync for SharedBumpArena<B>