Struct BufferAllocator

pub struct BufferAllocator { /* private fields */ }

BufferAllocator creates Buffer objects to be used for block device I/O requests.

This is implemented through a simple buddy allocation scheme.

Implementations

impl BufferAllocator

pub fn new(block_size: usize, source: BufferSource) -> Self

pub fn block_size(&self) -> usize

pub fn buffer_source(&self) -> &BufferSource

pub fn take_buffer_source(self) -> BufferSource

Takes the buffer source from the allocator and consumes the allocator.

pub fn allocate_buffer(&self, size: usize) -> BufferFuture<'_>

Allocates a Buffer with capacity for |size| bytes. Panics if the allocation exceeds the pool size. Blocks until there are enough bytes available to satisfy the request.

The allocated buffer will be block-aligned and the padding up to block alignment can also be used by the buffer.

Allocation is O(lg(N) + M), where N = size and M = number of allocations.

pub fn try_allocate_buffer( &self, size: usize, ) -> Result<Buffer<'_>, EventListener>

Like |allocate_buffer|, but returns an EventListener if the allocation cannot be satisfied. The listener will signal when the caller should try again.

Trait Implementations

impl Debug for BufferAllocator

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

Formats the value using the given formatter.