Struct BufferPool 

pub struct BufferPool { /* private fields */ }

Pre-allocated, fixed-size buffer pool owned by one worker.

Implementations

impl BufferPool

pub fn new(capacity: usize, buf_size: usize) -> Option<Self>

Pre-allocates capacity slots of buf_size bytes.

Returns None when buf_size != DEFAULT_BUF_SIZE and the io_uring feature would require matching registration granularity — callers should keep the default size.

pub fn buf_size(&self) -> usize

Slot size.

pub fn capacity(&self) -> usize

Number of slots.

pub fn free_slots(&self) -> usize

Free slot count.

pub fn take(&mut self) -> Option<u32>

Takes a slot, or None when the pool is exhausted (callers stop reading — TCP backpressure does the rest).

pub fn release(&mut self, slot: u32)

Returns a slot to the pool.

pub fn slot(&self, slot: u32) -> &[u8; 4096]

Reads the slot’s bytes (stable address, safe to hand to the kernel).

pub fn slot_mut(&mut self, slot: u32) -> &mut [u8; 4096]

Mutable access to a slot’s bytes.