yog 0.0.15

yog: the standalone server for litany loops — the world, the balls and the conversations, behind one wire
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
51
52
53
54

//! The whole windowless face, driven to completion — the test `main.rs` could
//! never carry, and the one bl-269a made possible at all.
//!
//! **This module is the suite's one owner of the process-wide stop flag.**
//! Every raise and every restore of it happens in the single test below, so no
//! two tests can race the one static; `engine::stop`'s own tests drive the loop
//! on a flag they own instead. One owner rather than a lock, which rule 7 keeps
//! in `state.rs` anyway.

use super::*;
use crate::cli_outbound::sys;
use crate::engine::stop;
use crate::test_support::world_under;
use std::sync::atomic::Ordering;
use std::time::{Duration, Instant};
use tempfile::tempdir;

/// `yog serve`, stopped. Catch the signal, run the handler as the kernel would
/// (see `sys::on_term` on why this is a call and not a delivered signal), then
/// boot every thread a running yog has and watch the face see the flag, return
/// from its loop, and drop the engine — stopping and joining all of them.
///
/// Before bl-269a this function's loop had no exit at all, which is why the
/// face lived in the coverage-excluded entry file and no test could reach it.
#[test]
fn serve_returns_once_a_stop_is_asked_for() {
    let root = tempdir().unwrap();
    let ambient = world_under(root.path());

    stop::catch();
    assert!(!stop::requested(), "nothing has asked for a stop yet");
    sys::on_term(libc::SIGTERM);
    assert!(
        stop::requested(),
        "the handler raises the flag and does nothing else"
    );

    let started = Instant::now();
    Engine::serve(&ambient, &[]);
    assert!(
        started.elapsed() < Duration::from_secs(30),
        "the drop stops and joins every thread; it must not park on any of them"
    );
    assert!(
        crate::world::layout(&ambient).tools.join("bl").exists(),
        "the face seeds the world it is about to hand to every child it spawns"
    );

    // Hand the disposition back so the rest of the suite dies on a signal as it
    // always did, and leave the flag exactly as this test found it.
    sys::term_disposition(false);
    sys::term_flag().store(false, Ordering::SeqCst);
    assert!(!stop::requested());
}