rusm_otp/
exit.rs

1/// Why a process terminated — carried to linked and monitoring processes.
2#[derive(Debug, Clone, Copy, PartialEq, Eq)]
3pub enum ExitReason {
4    /// Ran to completion, or was asked to stop cleanly. Does **not** propagate
5    /// down links (linked peers survive unless they trap exits).
6    Normal,
7    /// Stopped by [`kill`](crate::Runtime::kill) or a link cascade.
8    Killed,
9    /// The body panicked — Erlang's "let it crash".
10    Crashed,
11    /// Reported by a monitor when its target was already gone (Erlang's `noproc`).
12    NoProc,
13}
14
15impl ExitReason {
16    /// Whether this reason propagates death down links — everything but
17    /// [`Normal`](ExitReason::Normal), matching Erlang's exit-signal rules.
18    pub fn is_abnormal(self) -> bool {
19        !matches!(self, ExitReason::Normal)
20    }
21}
22
23/// Identifies a monitor set up with [`monitor`](crate::Runtime::monitor); echoed
24/// back in the resulting [`Received::Down`](crate::Received::Down) so a watcher
25/// can tell its monitors apart.
26#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
27pub struct MonitorRef(pub(crate) u64);
28
29impl MonitorRef {
30    pub fn raw(self) -> u64 {
31        self.0
32    }
33}
34
35#[cfg(test)]
36mod tests {
37    use super::*;
38
39    #[test]
40    fn only_normal_is_not_abnormal() {
41        assert!(!ExitReason::Normal.is_abnormal());
42        assert!(ExitReason::Killed.is_abnormal());
43        assert!(ExitReason::Crashed.is_abnormal());
44        assert!(ExitReason::NoProc.is_abnormal());
45    }
46
47    #[test]
48    fn monitor_ref_exposes_its_raw_id() {
49        assert_eq!(MonitorRef(7).raw(), 7);
50    }
51}
rusm_otp/exit.rs

rusm_otp/
exit.rs
