atap 0.1.0

Threadsafe futureless async runtime for macOS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

//! # Next run

use atap::{RuntimeError, TaskHandle};
use std::{
    thread,
    time::{Duration, Instant},
};

/// Takes the next output a repeat produces
///
/// ## Returns
/// `None` once the series has ended, or once `patience` has
/// run out
pub fn next_run<T>(handle: &TaskHandle<T>, patience: Duration) -> Option<T> {
    let deadline = Instant::now() + patience;

    while Instant::now() < deadline {
        match handle.try_take() {
            Ok(value) => return Some(value),

            // Between runs, or one still going
            Err(RuntimeError::AlreadyTaken) | Err(RuntimeError::NotReady) => {
                thread::sleep(Duration::from_millis(1))
            }

            // `Finished` and every other error are endings
            Err(_) => break,
        }
    }

    None
}