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ReadWake

Struct ReadWake 

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

Wakes a participant receive that is waiting on the socket with a budget.

§Which reads it interrupts

A wake ends, with SdkError::ReadInterrupted, a read made through a budgeted participant door while it waits for bytes: RemoteParticipantHandle::receive_within with a nonzero budget, whatever the budget (including one at or above the 60 s response deadline that a caller uses to await a correlated answer), and the wait for the liveness Pong inside RemoteParticipantHandle::try_receive. A frame already decoded is returned without waiting and so without consuming the wake, and a zero budget never waits at all. The interrupted read keeps any partly-arrived frame and the socket; a Pong still owed to an interrupted try_receive is consumed by a later read.

The reply-owed door RemoteParticipantHandle::receive, and every request/response exchange the transport makes for itself (publish, subscribe, conversations, the handshake), never observe a wake. “Idle” here means the door the caller chose, not whether a reply is owed: a caller that awaits a reply through receive_within can be interrupted.

§Sharing

There is one ReadWake per transport, not per handle. Every clone of it, every RemoteConfig sharing the transport, and every participant built over that transport reach the same wake, and it carries over a participant reconnect. A wake from any of them interrupts whichever interruptible read on that transport observes it first, through whichever handle is reading; it is not addressed to the caller that sent it.

Wake requests coalesce: a wake sent while no interruptible read is waiting stays pending and interrupts the next one, and several wakes before that read are one interrupt. A wake that lands while a reader is claiming an earlier one is never lost; at worst it costs one spurious interrupt of a later read. The handle holds only the wake pipe, so retaining it does not retain the transport socket or participant binding.

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impl ReadWake

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pub fn wake(&self) -> Result<(), SdkError>

Wake the interruptible read waiting now on this transport, or the next one to wait (see the type’s documentation). This never waits for the reader.

§Errors

Returns a connection error if the local wake pipe cannot be written.

Trait Implementations§

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impl Clone for ReadWake

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ReadWake

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl<T> Any for T
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impl<T> CloneToUninit for T
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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impl<T> From<T> for T

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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

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type Output = T

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type Error = <U as TryFrom<T>>::Error

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