Struct FdBudget 

pub struct FdBudget { /* private fields */ }

Shared fd permit pool used by PlainPbStoragePlugin. Cloning the budget hands the SAME counter to multiple plugins, so a process-wide cap can be enforced across STS/MTS/LTS instead of each tier privately keeping its own 512-fd ceiling and silently summing past the process ulimit.

Internally a Arc<AtomicUsize> plus a max. CAS-based reservation in try_reserve makes the cap a hard ceiling under concurrency (no check-then-fetch_add race).

Implementations

impl FdBudget

pub fn new(max: usize) -> Self

New budget with the given cap. 0 is sentinel for “unbounded” (lifts the cap to usize::MAX); any other value is the hard ceiling.

pub fn unbounded() -> Self

Convenience constructor for sites that want to disable the internal cap entirely (e.g. when the OS ulimit alone is the only ceiling that matters).

pub fn count(&self) -> usize

Snapshot of the current open-writer count (across every plugin sharing this budget). Lock-free; can drift between the read and any subsequent action.

pub fn max(&self) -> usize

Configured cap.

Trait Implementations

impl Clone for FdBudget

fn clone(&self) -> FdBudget

Returns a duplicate of the value.

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

Performs copy-assignment from source.