task.rs - source

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stream

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net

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open

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proc_macro_nested

quote

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rand

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rand_core

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rcgen

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ser

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textwrap

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io

driver

interest.rs mod.rs ready.rs registration.rs scheduled_io.rs

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loom

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macros

cfg.rs join.rs loom.rs mod.rs pin.rs ready.rs scoped_tls.rs select.rs support.rs thread_local.rs try_join.rs

net

park

either.rs mod.rs thread.rs

runtime

stream

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task

atomic_waker.rs mod.rs

barrier.rs batch_semaphore.rs broadcast.rs mod.rs mutex.rs notify.rs oneshot.rs rwlock.rs semaphore.rs watch.rs

task

blocking.rs local.rs mod.rs spawn.rs task_local.rs yield_now.rs

time

driver

wheel

level.rs mod.rs

entry.rs handle.rs mod.rs sleep.rs

clock.rs error.rs instant.rs interval.rs mod.rs timeout.rs

util

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blocking.rs coop.rs lib.rs prelude.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_rustls

common

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client.rs lib.rs server.rs

tokio_util

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cfg.rs compat.rs either.rs lib.rs loom.rs

typenum

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uhid_virt

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untrusted

vec_map

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which

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yasna

deserializer

models

der.rs mod.rs oid.rs time.rs

reader

error.rs mod.rs

serializer

tags

writer

zwp_virtual_keyboard

use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};

/// Converts a function to a future that completes on poll
pub(crate) struct BlockingTask<T> {
    func: Option<T>,
}

impl<T> BlockingTask<T> {
    /// Initializes a new blocking task from the given function
    pub(crate) fn new(func: T) -> BlockingTask<T> {
        BlockingTask { func: Some(func) }
    }
}

// The closure `F` is never pinned
impl<T> Unpin for BlockingTask<T> {}

impl<T, R> Future for BlockingTask<T>
where
    T: FnOnce() -> R + Send + 'static,
    R: Send + 'static,
{
    type Output = R;

    fn poll(mut self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<R> {
        let me = &mut *self;
        let func = me
            .func
            .take()
            .expect("[internal exception] blocking task ran twice.");

        // This is a little subtle:
        // For convenience, we'd like _every_ call tokio ever makes to Task::poll() to be budgeted
        // using coop. However, the way things are currently modeled, even running a blocking task
        // currently goes through Task::poll(), and so is subject to budgeting. That isn't really
        // what we want; a blocking task may itself want to run tasks (it might be a Worker!), so
        // we want it to start without any budgeting.
        crate::coop::stop();

        Poll::Ready(func())
    }
}