native-executor 0.7.0

Platform-native async task executor
Documentation 
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
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

#![cfg(all(
    feature = "polyfill",
    not(target_arch = "wasm32"),
    not(target_os = "android")
))]

use executor_core::Executor;
use futures_lite::future::block_on;
use native_executor::polyfill::executor::PolyfillExecutor;
use native_executor::polyfill::timer::PolyfillTimer;
use std::{
    sync::Once,
    time::{Duration, Instant},
};

static START_MAIN: Once = Once::new();

fn ensure_polyfill_main_executor() {
    START_MAIN.call_once(|| {
        std::thread::Builder::new()
            .name("polyfill-main-executor".into())
            .spawn(native_executor::polyfill::executor::start_main_executor)
            .expect("failed to start polyfill main executor");
        // Give the executor a moment to initialize before scheduling work.
        std::thread::sleep(Duration::from_millis(30));
    });
}

#[test]
fn polyfill_spawn_runs_background_task() {
    ensure_polyfill_main_executor();
    let exec = PolyfillExecutor;
    let task = exec.spawn(async { 2 + 5 });
    assert_eq!(block_on(task), 7);
}

#[test]
fn polyfill_main_executor_can_start() {
    ensure_polyfill_main_executor();
}

#[test]
fn polyfill_timer_respects_duration() {
    let start = Instant::now();
    block_on(PolyfillTimer::after(Duration::from_millis(15)));
    assert!(
        start.elapsed() >= Duration::from_millis(10),
        "polyfill timer should wait close to the requested duration"
    );
}