third_party/rust_crates/vendor/proptest/src/arbitrary/_std/thread.rs

//-
// Copyright 2017, 2018 The proptest developers
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Arbitrary implementations for `std::thread`.

use std::thread::*;
use crate::std_facade::String;

use crate::strategy::statics::static_map;
use crate::option::prob;
use crate::arbitrary::*;

arbitrary!(Builder, SMapped<(Option<usize>, Option<String>), Self>; {
    let prob = prob(0.7);
    let args = product_pack![
        product_pack![prob, Default::default()],
        product_pack![prob, Default::default()]
    ];
    static_map(arbitrary_with(args), |(os, on)| {
        let mut b = Builder::new();
        b = if let Some(size) = os { b.stack_size(size) } else { b };
        if let Some(name) = on { b.name(name) } else { b }
    })
});

/*
 * The usefulness of this impl is debatable - as are its semantics.
 * Perhaps a CoArbitrary-based solution is preferable.

arbitrary!([A: 'static + Send + Arbitrary<'a>] JoinHandle<A>,
    SMapped<'a, (A, Option<()>, u8), Self>, A::Parameters;
    args => {
        let prob  = prob(0.1);
        let args2 = product_pack![
            args,
            product_pack![prob, default()],
            default()
        ];
        any_with_smap(args2, |(val, panic, sleep)| thread::spawn(move || {
            // Sleep a random amount:
            use std::time::Duration;
            thread::sleep(Duration::from_millis(sleep as u64));

            // Randomly panic:
            if panic.is_some() {
                panic!("Arbitrary for JoinHandle randomly paniced!");
            }

            // Move value into thread and then just return it:
            val
        }))
    }
);
*/

#[cfg(test)]
mod test {
    no_panic_test!(
        builder => Builder
    );

    /*
    use super::*;
    proptest! {
        #[test]
        fn join_handle_works(ref jh in any::<JoinHandle<u8>>()) {
            use std::panic::catch_unwind;
            catch_unwind(|| {
                jh.join();
                ()
            })
        }
    }
    */
}