[][src]Struct futures::executor::LocalPool

pub struct LocalPool { /* fields omitted */ }

A single-threaded task pool for polling futures to completion.

This executor allows you to multiplex any number of tasks onto a single thread. It's appropriate to poll strictly I/O-bound futures that do very little work in between I/O actions.

To get a handle to the pool that implements Spawn, use the spawner() method. Because the executor is single-threaded, it supports a special form of task spawning for non-Send futures, via spawn_local_obj.

Methods

impl LocalPool
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pub fn new() -> LocalPool
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Create a new, empty pool of tasks.

pub fn spawner(&self) -> LocalSpawner
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Get a clonable handle to the pool as a [Spawn].

pub fn run(&mut self)
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Run all tasks in the pool to completion.

The given spawner, spawn, is used as the default spawner for any newly-spawned tasks. You can route these additional tasks back into the LocalPool by using its spawner handle:

use futures::executor::LocalPool;

let mut pool = LocalPool::new();

// ... spawn some initial tasks using `spawn.spawn()` or `spawn.spawn_local()`

// run *all* tasks in the pool to completion, including any newly-spawned ones.
pool.run();

The function will block the calling thread until all tasks in the pool are complete, including any spawned while running existing tasks.

pub fn run_until<F>(&mut self, future: F) -> <F as Future>::Output where
    F: Future
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Runs all the tasks in the pool until the given future completes.

The given spawner, spawn, is used as the default spawner for any newly-spawned tasks. You can route these additional tasks back into the LocalPool by using its spawner handle:

#![feature(futures_api)]
use futures::executor::LocalPool;
use futures::future::ready;

let mut pool = LocalPool::new();

// run tasks in the pool until `my_app` completes, by default spawning
// further tasks back onto the pool
pool.run_until(my_app);

The function will block the calling thread only until the future f completes; there may still be incomplete tasks in the pool, which will be inert after the call completes, but can continue with further use of run or run_until. While the function is running, however, all tasks in the pool will try to make progress.

Trait Implementations

impl Debug for LocalPool
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impl Default for LocalPool
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Auto Trait Implementations

impl !Send for LocalPool

impl !Sync for LocalPool

Blanket Implementations

impl<T> From for T
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impl<T, U> Into for T where
    U: From<T>, 
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impl<T, U> TryFrom for T where
    T: From<U>, 
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type Error = !

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
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impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> BorrowMut for T where
    T: ?Sized
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impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.