Struct std::sync::OnceState
[−]
[src]
pub struct OnceState { /* fields omitted */ }State yielded to call_once_force’s closure parameter. The state can be
used to query the poison status of the Once.
Methods
impl OnceState[src]
pub fn poisoned(&self) -> bool[src]
Returns whether the associated Once was poisoned prior to the
invocation of the closure passed to call_once_force.
Examples
A poisoned Once:
#![feature(once_poison)] use std::sync::{Once, ONCE_INIT}; use std::thread; static INIT: Once = ONCE_INIT; // poison the once let handle = thread::spawn(|| { INIT.call_once(|| panic!()); }); assert!(handle.join().is_err()); INIT.call_once_force(|state| { assert!(state.poisoned()); });Run
An unpoisoned Once:
#![feature(once_poison)] use std::sync::{Once, ONCE_INIT}; static INIT: Once = ONCE_INIT; INIT.call_once_force(|state| { assert!(!state.poisoned()); });Run