Trait SpawnBlocking 

pub trait SpawnBlocking<R>
where
    R: Send + 'static,
{
    // Required methods
    fn spawn_blocking<F>(&self, f: F) -> BlockingHandle<R> 
       where F: FnOnce() -> R + Send + 'static,
             Self: Sized;
    fn spawn_blocking_dyn(
        &self,
        f: Box<dyn FnOnce() -> R + Send>,
    ) -> BlockingHandle<R> ;
}

Indicate the executor can provide a threadpool for blocking operations. There is two methods of this trait. One of them requires boxing the closure and the other is not object safe.

Required Methods

fn spawn_blocking<F>(&self, f: F) -> BlockingHandle<R>

where F: FnOnce() -> R + Send + 'static, Self: Sized,

Runs the provided closure on a thread where blocking is acceptable.

fn spawn_blocking_dyn( &self, f: Box<dyn FnOnce() -> R + Send>, ) -> BlockingHandle<R>

Runs the provided closure on a thread where blocking is acceptable. This part of the trait is object safe but your closure must be boxed and you cannot have a return value.

Implementations on Foreign Types

impl<R, T> SpawnBlocking<R> for &T

where T: SpawnBlocking<R>, R: Send + 'static,

fn spawn_blocking<F>(&self, f: F) -> BlockingHandle<R>

where F: FnOnce() -> R + Send + 'static, T: Sized,

fn spawn_blocking_dyn( &self, f: Box<dyn FnOnce() -> R + Send>, ) -> BlockingHandle<R>

impl<R, T> SpawnBlocking<R> for &mut T

where T: SpawnBlocking<R>, R: Send + 'static,

fn spawn_blocking<F>(&self, f: F) -> BlockingHandle<R>

where F: FnOnce() -> R + Send + 'static, T: Sized,

fn spawn_blocking_dyn( &self, f: Box<dyn FnOnce() -> R + Send>, ) -> BlockingHandle<R>

impl<R, T> SpawnBlocking<R> for Box<T>

where T: SpawnBlocking<R>, R: Send + 'static,

fn spawn_blocking<F>(&self, f: F) -> BlockingHandle<R>

where F: FnOnce() -> R + Send + 'static, T: Sized,

fn spawn_blocking_dyn( &self, f: Box<dyn FnOnce() -> R + Send>, ) -> BlockingHandle<R>

impl<R, T> SpawnBlocking<R> for Rc<T>

where T: SpawnBlocking<R>, R: Send + 'static,

fn spawn_blocking<F>(&self, f: F) -> BlockingHandle<R>

where F: FnOnce() -> R + Send + 'static, T: Sized,

fn spawn_blocking_dyn( &self, f: Box<dyn FnOnce() -> R + Send>, ) -> BlockingHandle<R>

impl<R, T> SpawnBlocking<R> for Arc<T>

where T: SpawnBlocking<R>, R: Send + 'static,

fn spawn_blocking<F>(&self, f: F) -> BlockingHandle<R>

where F: FnOnce() -> R + Send + 'static, T: Sized,

fn spawn_blocking_dyn( &self, f: Box<dyn FnOnce() -> R + Send>, ) -> BlockingHandle<R>

Implementors

impl<R: Send + 'static> SpawnBlocking<R> for AsyncStd

Available on crate feature async_std and non-WebAssembly only.

impl<R: Send + 'static> SpawnBlocking<R> for TokioTp

Available on crate feature tokio_tp only.