Struct Held 

pub struct Held { /* private fields */ }

A held permit, released when dropped.

Released on drop rather than by a call, because every early return in a run is a place a release would be forgotten — and a leaked permit is invisible until the pool is full, at which point the symptom is that nothing starts and nothing says why. The Drop still cannot run on a SIGKILL, which is what the pid check is for: the next caller reclaims it.

Trait Implementations

impl Drop for Held

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.