thread-tree 0.3.3

A tree-structured thread pool for splitting jobs hierarchically on worker threads. The tree structure means that there is no contention between workers when delivering jobs.
Documentation 
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// Package up unwind recovery. Note that if you are in some sensitive
// place, you can use the `AbortIfPanic` helper to protect against
// accidental panics in the rayon code itself.

use std::any::Any;
use std::thread;
use std::io::prelude::*;
use std::io::stderr;
use std::panic::{self, AssertUnwindSafe};

/// Executes `f` and captures any panic, translating that panic into a
/// `Err` result. The assumption is that any panic will be propagated
/// later with `resume_unwinding`, and hence `f` can be treated as
/// exception safe.
pub fn halt_unwinding<F, R>(func: F) -> thread::Result<R>
where
    F: FnOnce() -> R,
{
    panic::catch_unwind(AssertUnwindSafe(func))
}

pub fn resume_unwinding(payload: Box<dyn Any + Send>) -> ! {
    panic::resume_unwind(payload)
}

pub struct AbortIfPanic;

fn aborting() {
    let _ = writeln!(&mut stderr(), "Rayon: detected unexpected panic; aborting");
}

impl Drop for AbortIfPanic {
    fn drop(&mut self) {
        aborting();
        ::std::process::abort(); // stable in rust 1.17
    }
}