Struct ChildAdmission 

pub struct ChildAdmission {
    pub share_bps: u16,
    pub holders: usize,
}

A single admitted child edge: the share it claimed plus a reference count of the active evaluations currently holding it.

The share is charged against the parent as long as the edge exists. The holders refcount exists because the registry stores exactly ONE edge per (parent, child) pair, yet OVERLAPPING evaluations of the same delegated capability each depend on that single edge concurrently. A boolean “who inserted it” owner is unsound: if the inserting evaluation is cancelled it would free the edge while a re-admitting sibling evaluation still holds the capability, letting an oversubscribing sibling be admitted against the wrongly-returned share. Every AdmitMode::Lease admit (fresh insert OR idempotent re-admit) takes one lease (holders += 1); every release drops one (holders -= 1). The edge is freed - and its share returned to the parent - only when the LAST real holder releases (holders reaches 0).

holders counts ONLY live releasable holders. An edge can legitimately have holders == 0: a verifier-only surface (see AdmitMode::VerifyOnly) commits a fresh child’s share for sibling-sum accounting without acquiring a lease, because it has no cleanup path that would ever release one. Such a committed edge is never pinned past its real holders: a later real dispatch that leases it (0 -> 1) and releases (1 -> 0) frees the edge, and a verify-only re-admit never touches the count.

Fields

share_bps: u16

The share this child claimed when it was first admitted, in basis points. Every lease on this edge shares the same recorded value; a re-admit with a different share is rejected as a BudgetSplitError.

holders: usize

Count of active evaluations holding a lease on this edge. Access is serialized by the registry’s lock, so a plain counter (rather than an atomic) is sufficient: the increment/decrement is always performed inside the same critical section as the insert/remove decision.

Trait Implementations

impl Clone for ChildAdmission

fn clone(&self) -> ChildAdmission

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChildAdmission

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

Formats the value using the given formatter.

impl Eq for ChildAdmission

impl PartialEq for ChildAdmission

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ChildAdmission