Module cancellation 

Cooperative cancellation tokens for commands and tasks.

CancellationToken provides a thread-safe, cloneable signal that tasks can poll to detect cooperative cancellation requests. It extends the subscription StopSignal pattern to the command/task domain, enabling bounded-lifetime effects and graceful teardown.

Migration rationale

Web frameworks use AbortController / AbortSignal for effect cancellation. This module provides an equivalent Rust-native primitive that the migration code emitter can target when translating cancellable async workflows.

Example

use ftui_runtime::cancellation::{CancellationSource, CancellationToken};
use std::time::Duration;

let source = CancellationSource::new();
let token = source.token();

// Pass token to a background task
std::thread::spawn(move || {
    while !token.is_cancelled() {
        // do work...
        std::thread::sleep(Duration::from_millis(10));
    }
});

// Cancel from the control side
source.cancel();

Structs

CancellationSource

The control handle that triggers cancellation.

CancellationToken

A thread-safe, cloneable cancellation token.