# Trait std::task::Executor[−][src]

    pub trait Executor {
        fn spawn_obj(
            &mut self,
            future: FutureObj<'static, ()>
        ) -> Result<(), SpawnObjError>;

        fn status(&self) -> Result<(), SpawnErrorKind> { ... }
    }

🔬 This is a nightly-only experimental API. (`futures_api` #50547)

futures in libcore are unstable

A task executor.

Futures are polled until completion by tasks, a kind of lightweight "thread". A task executor is responsible for the creation of these tasks and the coordination of their execution on real operating system threads. In particular, whenever a task signals that it can make further progress via a wake-up notification, it is the responsibility of the task executor to put the task into a queue to continue executing it, i.e. polling the future in it, later.

## Required Methods

### `fn spawn_obj(
&mut self,
future: FutureObj<'static, ()>
) -> Result<(), SpawnObjError>`

🔬 This is a nightly-only experimental API. (`futures_api` #50547)

futures in libcore are unstable

Spawns a new task with the given future. The future will be polled until completion.

# Errors

The executor may be unable to spawn tasks, either because it has been shut down or is resource-constrained.

## Provided Methods

### `fn status(&self) -> Result<(), SpawnErrorKind>`

🔬 This is a nightly-only experimental API. (`futures_api` #50547)

futures in libcore are unstable

Determines whether the executor is able to spawn new tasks.

# Returns

An `Ok` return means the executor is likely (but not guaranteed) to accept a subsequent spawn attempt. Likewise, an `Err` return means that `spawn` is likely, but not guaranteed, to yield an error.

## Implementors

- `impl<E> Executor for Box<E> where E: Executor + ?Sized,` | [src]

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