Struct tokio::task::JoinError

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pub struct JoinError { /* private fields */ }
Expand description

Task failed to execute to completion.

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impl JoinError

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pub fn is_cancelled(&self) -> bool

Returns true if the error was caused by the task being cancelled.

See the module level docs for more information on cancellation.

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pub fn is_panic(&self) -> bool

Returns true if the error was caused by the task panicking.

§Examples
use std::panic;

#[tokio::main]
async fn main() {
    let err = tokio::spawn(async {
        panic!("boom");
    }).await.unwrap_err();

    assert!(err.is_panic());
}
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pub fn into_panic(self) -> Box<dyn Any + Send + 'static>

Consumes the join error, returning the object with which the task panicked.

§Panics

into_panic() panics if the Error does not represent the underlying task terminating with a panic. Use is_panic to check the error reason or try_into_panic for a variant that does not panic.

§Examples
use std::panic;

#[tokio::main]
async fn main() {
    let err = tokio::spawn(async {
        panic!("boom");
    }).await.unwrap_err();

    if err.is_panic() {
        // Resume the panic on the main task
        panic::resume_unwind(err.into_panic());
    }
}
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pub fn try_into_panic(self) -> Result<Box<dyn Any + Send + 'static>, JoinError>

Consumes the join error, returning the object with which the task panicked if the task terminated due to a panic. Otherwise, self is returned.

§Examples
use std::panic;

#[tokio::main]
async fn main() {
    let err = tokio::spawn(async {
        panic!("boom");
    }).await.unwrap_err();

    if let Ok(reason) = err.try_into_panic() {
        // Resume the panic on the main task
        panic::resume_unwind(reason);
    }
}

Trait Implementations§

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impl Debug for JoinError

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fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Display for JoinError

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fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Error for JoinError

1.30.0 · source§

fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more
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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
1.0.0 · source§

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)
Provides type based access to context intended for error reports. Read more
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impl From<JoinError> for Error

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fn from(src: JoinError) -> Error

Converts to this type from the input type.

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.