VarSlotMeta

shm_primitives::slot

Struct VarSlotMeta 

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#[repr(C)]
pub struct VarSlotMeta {
    pub generation: AtomicU32,
    pub state: AtomicU32,
    pub owner_peer: AtomicU32,
    pub next_free: AtomicU32,
}
Expand description

Metadata for a variable-size slot with ownership tracking.

Used by shared variable-size slot pools where we need to track which peer allocated each slot for crash recovery.

shm[impl shm.varslot.ownership]

Fields§

§generation: AtomicU32

ABA counter, incremented on allocation.

§state: AtomicU32

Slot state: Free=0, Allocated=1, InFlight=2.

§owner_peer: AtomicU32

Peer ID that allocated this slot (0 = host, 1-255 = guest). Used for crash recovery: when a peer dies, its slots are reclaimed.

§next_free: AtomicU32

Free list link (next free slot index, or u32::MAX for end).

Implementations§

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impl VarSlotMeta

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pub fn init(&mut self)

Initialize a new variable slot metadata entry.

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pub fn generation(&self) -> u32

Read the current generation.

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pub fn state(&self) -> SlotState

Read the current state.

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pub fn owner(&self) -> u8

Read the owner peer ID.

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pub fn next_free(&self) -> u32

Read the next free slot index.

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pub fn check_generation(&self, expected: u32) -> bool

Check if the slot matches the expected generation.

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