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Rollup merge of #68945 - mjbshaw:once_is_completed, r=LukasKalbertodt 

Stabilize Once::is_completed

Closes #54890

This function has been around for some time. I haven't seen anyone raise any objections to it. I've personally found it useful myself. It would be nice to finally stabilize it and
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Dylan DPC 2020-02-20 10:49:10 +01:00 committed by GitHub
parent f7ce5ff19c 348278a7fd
commit 588f00841b
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1 changed files with 5 additions and 6 deletions
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11
src/libstd/sync/once.rs
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@ -331,14 +331,14 @@ impl Once {
/// * `call_once` was called, but has not yet completed, /// * `call_once` was called, but has not yet completed,
/// * the `Once` instance is poisoned /// * the `Once` instance is poisoned
/// ///
/// It is also possible that immediately after `is_completed` /// This function returning `false` does not mean that `Once` has not been
/// returns false, some other thread finishes executing /// executed. For example, it may have been executed in the time between
/// `call_once`. /// when `is_completed` starts executing and when it returns, in which case
/// the `false` return value would be stale (but still permissible).
/// ///
/// # Examples /// # Examples
/// ///
/// ``` /// ```
/// #![feature(once_is_completed)]
/// use std::sync::Once; /// use std::sync::Once;
/// ///
/// static INIT: Once = Once::new(); /// static INIT: Once = Once::new();
@ -351,7 +351,6 @@ impl Once {
/// ``` /// ```
/// ///
/// ``` /// ```
/// #![feature(once_is_completed)]
/// use std::sync::Once; /// use std::sync::Once;
/// use std::thread; /// use std::thread;
/// ///
@ -364,7 +363,7 @@ impl Once {
/// assert!(handle.join().is_err()); /// assert!(handle.join().is_err());
/// assert_eq!(INIT.is_completed(), false); /// assert_eq!(INIT.is_completed(), false);
/// ``` /// ```
#[unstable(feature = "once_is_completed", issue = "54890")] #[stable(feature = "once_is_completed", since = "1.44.0")]
#[inline] #[inline]
pub fn is_completed(&self) -> bool { pub fn is_completed(&self) -> bool {
// An `Acquire` load is enough because that makes all the initialization // An `Acquire` load is enough because that makes all the initialization