Struct EventsChainLayout 

#[repr(C, align(64))]
pub struct EventsChainLayout<const Q: usize> {
    pub header: LayoutHeader,
    pub initialized: IndexbusAtomicU32,
    pub _pad0: u32,
    pub _pad_to_64: [u8; 40],
    pub slot_pool: SlotPoolLayout,
    pub queues: [IndexQueue; Q],
    pub mpsc_queues: [MpscQueue; Q],
}

Shared-memory layout that enables slot passing across a chain of queues.

Conceptually:

• one slot pool (payload bytes)
• Q independent SPSC queues that carry slot indices
• Q independent MPSC queues that carry slot indices

When adjacent stages are connected by queues within the same chain mapping, the executor can forward slot indices without copying payload bytes.

Fields

header: LayoutHeader

Common region header (magic/version/capabilities/layout size).

initialized: IndexbusAtomicU32

0 = uninitialized, 1 = initializing, 2 = initialized

_pad0: u32

Padding (reserved).

_pad_to_64: [u8; 40]

Pad to 64 so the first 64-byte-aligned section starts at offset 64.

slot_pool: SlotPoolLayout

Shared slot pool for payload bytes.

queues: [IndexQueue; Q]

Per-edge SPSC queues of slot indices.

mpsc_queues: [MpscQueue; Q]

Per-edge MPSC queues of slot indices.

Implementations

impl<const Q: usize> EventsChainLayout<Q>

pub const REQUIRED_CAPS: u32

Capabilities required for this region to be considered compatible.

pub const REGION_KIND: u16 = flags::BYTEOR_REGION_KIND_EVENTS_CHAIN

Region kind discriminator stored in LayoutHeader.flags.

pub const REGION_KIND_MASK: u16 = ib_flags::INDEXBUS_FLAGS_REGION_KIND_MASK

Mask for the low 8 bits containing the region kind discriminator.