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Clarify thread::park semantics #52771

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merged 2 commits into from
Aug 1, 2018
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Clarify thread::park semantics #52771

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922bf1d
Clarify thread::park semantics
matklad Jul 27, 2018
5f87f78
Fix ws
matklad Jul 27, 2018
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5 changes: 4 additions & 1 deletion src/libstd/thread/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -731,7 +731,8 @@ const NOTIFIED: usize = 2;
/// specifying a maximum time to block the thread for.
///
/// * The [`unpark`] method on a [`Thread`] atomically makes the token available
/// if it wasn't already.
/// if it wasn't already. Because the token is initially absent, [`unpark`]
/// followed by [`park`] will result in the second call returning immediately.
///
/// In other words, each [`Thread`] acts a bit like a spinlock that can be
/// locked and unlocked using `park` and `unpark`.
Expand Down Expand Up @@ -766,6 +767,8 @@ const NOTIFIED: usize = 2;
/// // Let some time pass for the thread to be spawned.
/// thread::sleep(Duration::from_millis(10));
///
/// // There is no race condition here, if `unpark`
/// // happens first, `park` will return immediately.
/// println!("Unpark the thread");
/// parked_thread.thread().unpark();
///
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