Struct SabHeader 

#[repr(C)]
pub struct SabHeader {
    pub state: AtomicU64,
    pub tick: AtomicU64,
    pub room_min_x: AtomicU32,
    pub room_min_y: AtomicU32,
    pub room_max_x: AtomicU32,
    pub room_max_y: AtomicU32,
    pub room_bounds_seq: AtomicU32,
    pub _pad: AtomicU32,
}

The header for the SharedArrayBuffer.

state packs entity_count (high 32 bits) and flip_bit (low 32 bits) into a single AtomicU64 so that readers always observe a consistent pair with a single acquire load, eliminating the TOCTOU window that existed when they were separate AtomicU32 fields.

Fields

state: AtomicU64

Packed atomic state: high 32 bits = entity_count, low 32 bits = flip_bit (0 or 1). Updated with a single Release store in commit_write.

tick: AtomicU64

The latest server tick corresponding to the data in the active buffer.

room_min_x: AtomicU32

room_min_y: AtomicU32

room_max_x: AtomicU32

room_max_y: AtomicU32

room_bounds_seq: AtomicU32

Seqlock counter for room bounds. Odd = write in progress; even = stable. Writer bumps to odd before writing the four bounds fields, then to even (Release) after. Readers spin until they observe two equal even values around their reads.

_pad: AtomicU32

Trait Implementations

impl Debug for SabHeader

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

Formats the value using the given formatter.