Struct CancellationTokenSource

#[repr(C)]
pub struct CancellationTokenSource { /* private fields */ }

Implementations

impl CancellationTokenSource

pub fn new() -> CancellationTokenSource

pub fn token(&self) -> &Arc<CancellationToken>

Gets the token managed by this CancellationTokenSource.

The Arc can be cloned so that the token can be passed into asynchronous tasks that might outlive the CancellationTokenSource.

pub fn cancel(&self)

Marks the cancellation token as canceled.

Executes the on_cancel callback of any active CancellationToken::run invocations. Has no effect if the cancellation token was already canceled.

pub fn cancel_after(&self, dur: Duration)

Creates a new, detached thread that waits for the specified duration and then marks the cancellation token as canceled.

Methods from Deref<Target = CancellationToken>

pub fn is_canceled(&self) -> bool

Gets whether this token has been canceled.

This function is inherently racy: it may start returning true at any moment as the token is canceled by another thread.

However, once the function returns true, it will always keep returning true (cancellation tokens cannot be reset).

pub fn result(&self) -> Result<(), OperationCanceled>

Returns Ok(()) if this token has not been canceled. Returns Err(OperationCanceled) if this token has been canceled.

This is an alternative to is_canceled() that can be used with the try!() macro.

pub fn run<C, F, R>(&self, on_cancel: C, f: F) -> R

where C: FnOnce() + Send, F: FnOnce() -> R,

Runs function f on the current thread. If the token is canceled while f is running, the on_cancel function will be executed by the thread calling cancel().

If the f callback returns before the on_cancel callback does, run() waits for the on_cancel callback to finish before returning. Any memory writes performed by the on_cancel callback will be visible after run() returns.

If the token is already canceled when this function is called, on_cancel will be executed on the current thread before f is called.

If the token is not canceled during the execution of f, the on_cancel callback will not be called at all.

Panics in the f callback are supported: unwinding will wait for on_cancel to finish (if it is running concurrently) and unregister the on_cancel callback from the token.

Panics in the on_cancel callback may abort the process.

Trait Implementations

impl Debug for CancellationTokenSource

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

Formats the value using the given formatter.

impl Deref for CancellationTokenSource

type Target = CancellationToken

The resulting type after dereferencing.

fn deref(&self) -> &CancellationToken

Dereferences the value.