/rust/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.42.0/src/task/unconstrained.rs

Source (jump to first uncovered line)
use pin_project_lite::pin_project;
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};

pin_project! {
    /// Future for the [`unconstrained`](unconstrained) method.
    #[cfg_attr(docsrs, doc(cfg(feature = "rt")))]
    #[must_use = "Unconstrained does nothing unless polled"]
    pub struct Unconstrained<F> {
        #[pin]
        inner: F,
    }
}

impl<F> Future for Unconstrained<F>
where
    F: Future,
{
    type Output = <F as Future>::Output;

    cfg_coop! {
        fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
            let inner = self.project().inner;
            crate::runtime::coop::with_unconstrained(|| inner.poll(cx))
        }
    }

    cfg_not_coop! {
        fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
            let inner = self.project().inner;
            inner.poll(cx)
        }
    }
}

/// Turn off cooperative scheduling for a future. The future will never be forced to yield by
/// Tokio. Using this exposes your service to starvation if the unconstrained future never yields
/// otherwise.
///
/// See also the usage example in the [task module](index.html#unconstrained).
#[cfg_attr(docsrs, doc(cfg(feature = "rt")))]
pub fn unconstrained<F>(inner: F) -> Unconstrained<F> {
    Unconstrained { inner }
}

Line	Count	Source (jump to first uncovered line)
1		use pin_project_lite::pin_project;
2		use std::future::Future;
3		use std::pin::Pin;
4		use std::task::{Context, Poll};
5
6		pin_project! {
7		/// Future for the [`unconstrained`](unconstrained) method.
8		#[cfg_attr(docsrs, doc(cfg(feature = "rt")))]
9		#[must_use = "Unconstrained does nothing unless polled"]
10		pub struct Unconstrained<F> {
11		#[pin]
12		inner: F,
13		}
14		}
15
16		impl<F> Future for Unconstrained<F>
17		where
18		F: Future,
19		{
20		type Output = <F as Future>::Output;
21
22		cfg_coop! {
23	0	fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
24	0	let inner = self.project().inner;
25	0	crate::runtime::coop::with_unconstrained(\|\| inner.poll(cx)) Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll::{closure#0} Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll::{closure#0} Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll::{closure#0} Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll::{closure#0} Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll::{closure#0}
26	0	} Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll Unexecuted instantiation: <tokio::task::unconstrained::Unconstrained<_> as core::future::future::Future>::poll
27		}
28
29		cfg_not_coop! {
30		fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
31		let inner = self.project().inner;
32		inner.poll(cx)
33		}
34		}
35		}
36
37		/// Turn off cooperative scheduling for a future. The future will never be forced to yield by
38		/// Tokio. Using this exposes your service to starvation if the unconstrained future never yields
39		/// otherwise.
40		///
41		/// See also the usage example in the [task module](index.html#unconstrained).
42		#[cfg_attr(docsrs, doc(cfg(feature = "rt")))]
43	0	pub fn unconstrained<F>(inner: F) -> Unconstrained<F> {
44	0	Unconstrained { inner }
45	0	} Unexecuted instantiation: tokio::task::unconstrained::unconstrained::<_> Unexecuted instantiation: tokio::task::unconstrained::unconstrained::<_> Unexecuted instantiation: tokio::task::unconstrained::unconstrained::<_> Unexecuted instantiation: tokio::task::unconstrained::unconstrained::<_> Unexecuted instantiation: tokio::task::unconstrained::unconstrained::<_>

Coverage Report

Created: 2024-12-17 06:15