Struct SlotHeader 

#[repr(C, align(4))]
pub struct SlotHeader {
    pub sequence_number: u32,
    pub sample_size: u32,
    pub reader_mask: ReaderMask,
    pub _reserved: u32,
}

Slot header — set by the writer in commit_slot and interpreted by the reader in read_flat.

The layout is repr(C, packed(4)) so the wire format is byte-stable across all platforms.

Fields

sequence_number: u32

Writer-local sequence number.

sample_size: u32

Sample size in bytes (= T::WIRE_SIZE for FlatStruct<T>).

reader_mask: ReaderMask

Bitmap: which readers have read. 0 = new, all 1-bits = free.

_reserved: u32

Padding for cache-line alignment + future extensions.

Implementations

impl SlotHeader

pub const fn new(sn: u32, sample_size: u32) -> Self

Constructor for a new slot on commit.

pub const fn all_read(&self, active_readers_mask: ReaderMask) -> bool

true when all bits in active_readers are set ⇒ the slot is free (all readers have read).

pub fn mark_read(&mut self, reader_index: u8)

Sets bit reader_index in reader_mask (the reader has read).

pub fn to_bytes_le(&self) -> [u8; 16]

Wire encoding: 16 bytes little-endian.

pub fn from_bytes_le(bytes: &[u8]) -> Option<Self>

Wire decoding from 16 bytes little-endian.

Errors

Returns None when bytes is too short.

Trait Implementations

impl Clone for SlotHeader

fn clone(&self) -> SlotHeader

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for SlotHeader

impl Debug for SlotHeader

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

Formats the value using the given formatter.

impl Eq for SlotHeader

impl PartialEq for SlotHeader

fn eq(&self, other: &SlotHeader) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for SlotHeader