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 — wird vom Writer beim commit_slot gesetzt und vom Reader beim read_flat interpretiert.

Layout ist repr(C, packed(4)) damit das Wire-Format byte-stable auf allen Plattformen ist.

Fields

sequence_number: u32

Writer-lokale Sequenz-Nummer.

sample_size: u32

Sample-Size in Bytes (= T::WIRE_SIZE fuer FlatStruct<T>).

reader_mask: ReaderMask

Bitmap: welche Reader haben gelesen. 0 = neu, alle 1-Bits = frei.

_reserved: u32

Padding fuer Cache-Line-Alignment + zukuenftige Erweiterungen.

Implementations

impl SlotHeader

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

Konstruktor fuer neuen Slot beim commit.

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

true wenn alle Bits in active_readers gesetzt sind ⇒ Slot ist frei (alle Reader haben gelesen).

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

Setzt Bit reader_index im reader_mask (Reader hat gelesen).

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

Wire-Encoding: 16 byte little-endian.

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

Wire-Decoding aus 16 byte little-endian.

Errors

Liefert None wenn bytes zu kurz ist.

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 Debug for SlotHeader

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

Formats the value using the given formatter.

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 Copy for SlotHeader

impl Eq for SlotHeader

impl StructuralPartialEq for SlotHeader