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WaitQueue

ostd::sync

Struct WaitQueue 

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pub struct WaitQueue { /* private fields */ }
Expand description

A wait queue.

One may wait on a wait queue to put its executing thread to sleep. Multiple threads may be the waiters of a wait queue. Other threads may invoke the wake-family methods of a wait queue to wake up one or many waiting threads.

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impl WaitQueue

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pub closed spec fn type_inv(self) -> bool

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impl WaitQueue

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pub const exec fn new() -> Self

Creates a new, empty wait queue.

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pub exec fn wait_until<F, R>(&self, cond: F) -> ret : R
where F: FnMut() -> Option<R>,

requires
cond.requires(()),
ensures
cond.ensures((), Some(ret)),

Waits until some condition is met.

This method takes a closure that tests a user-given condition. The method only returns if the condition returns Some(_). A waker thread should first make the condition Some(_), then invoke the wake-family method. This ordering is important to ensure that waiter threads do not lose any wakeup notifications.

By taking a condition closure, this wait-wakeup mechanism becomes more efficient and robust.

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pub exec fn wake_one(&self) -> r : bool

Wakes up one waiting thread, if there is one at the point of time when this method is called, returning whether such a thread was woken up.

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pub exec fn wake_all(&self) -> r : usize

Wakes up all waiting threads, returning the number of threads that were woken up.

Trait Implementations§

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impl Default for WaitQueue

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exec fn default() -> Self

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impl<T> Any for T
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fn type_id(&self) -> TypeId

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impl<T, VERUS_SPEC__A> FromSpec<T> for VERUS_SPEC__A
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fn obeys_from_spec() -> bool

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fn obeys_from_spec() -> bool

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fn obeys_into_spec() -> bool

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fn obeys_into_spec() -> bool

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