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|
extern crate crossbeam_utils;
use std::any::Any;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::thread::sleep;
use std::time::Duration;
use crossbeam_utils::thread;
const THREADS: usize = 10;
const SMALL_STACK_SIZE: usize = 20;
#[test]
fn join() {
let counter = AtomicUsize::new(0);
thread::scope(|scope| {
let handle = scope.spawn(|_| {
counter.store(1, Ordering::Relaxed);
});
assert!(handle.join().is_ok());
let panic_handle = scope.spawn(|_| {
panic!("\"My honey is running out!\", said Pooh.");
});
assert!(panic_handle.join().is_err());
})
.unwrap();
// There should be sufficient synchronization.
assert_eq!(1, counter.load(Ordering::Relaxed));
}
#[test]
fn counter() {
let counter = AtomicUsize::new(0);
thread::scope(|scope| {
for _ in 0..THREADS {
scope.spawn(|_| {
counter.fetch_add(1, Ordering::Relaxed);
});
}
})
.unwrap();
assert_eq!(THREADS, counter.load(Ordering::Relaxed));
}
#[test]
fn counter_builder() {
let counter = AtomicUsize::new(0);
thread::scope(|scope| {
for i in 0..THREADS {
scope
.builder()
.name(format!("child-{}", i))
.stack_size(SMALL_STACK_SIZE)
.spawn(|_| {
counter.fetch_add(1, Ordering::Relaxed);
})
.unwrap();
}
})
.unwrap();
assert_eq!(THREADS, counter.load(Ordering::Relaxed));
}
#[test]
fn counter_panic() {
let counter = AtomicUsize::new(0);
let result = thread::scope(|scope| {
scope.spawn(|_| {
panic!("\"My honey is running out!\", said Pooh.");
});
sleep(Duration::from_millis(100));
for _ in 0..THREADS {
scope.spawn(|_| {
counter.fetch_add(1, Ordering::Relaxed);
});
}
});
assert_eq!(THREADS, counter.load(Ordering::Relaxed));
assert!(result.is_err());
}
#[test]
fn panic_twice() {
let result = thread::scope(|scope| {
scope.spawn(|_| {
sleep(Duration::from_millis(500));
panic!("thread #1");
});
scope.spawn(|_| {
panic!("thread #2");
});
});
let err = result.unwrap_err();
let vec = err
.downcast_ref::<Vec<Box<dyn Any + Send + 'static>>>()
.unwrap();
assert_eq!(2, vec.len());
let first = vec[0].downcast_ref::<&str>().unwrap();
let second = vec[1].downcast_ref::<&str>().unwrap();
assert_eq!("thread #1", *first);
assert_eq!("thread #2", *second)
}
#[test]
fn panic_many() {
let result = thread::scope(|scope| {
scope.spawn(|_| panic!("deliberate panic #1"));
scope.spawn(|_| panic!("deliberate panic #2"));
scope.spawn(|_| panic!("deliberate panic #3"));
});
let err = result.unwrap_err();
let vec = err
.downcast_ref::<Vec<Box<dyn Any + Send + 'static>>>()
.unwrap();
assert_eq!(3, vec.len());
for panic in vec.iter() {
let panic = panic.downcast_ref::<&str>().unwrap();
assert!(
*panic == "deliberate panic #1"
|| *panic == "deliberate panic #2"
|| *panic == "deliberate panic #3"
);
}
}
#[test]
fn nesting() {
let var = "foo".to_string();
struct Wrapper<'a> {
var: &'a String,
}
impl<'a> Wrapper<'a> {
fn recurse(&'a self, scope: &thread::Scope<'a>, depth: usize) {
assert_eq!(self.var, "foo");
if depth > 0 {
scope.spawn(move |scope| {
self.recurse(scope, depth - 1);
});
}
}
}
let wrapper = Wrapper { var: &var };
thread::scope(|scope| {
scope.spawn(|scope| {
scope.spawn(|scope| {
wrapper.recurse(scope, 5);
});
});
})
.unwrap();
}
#[test]
fn join_nested() {
thread::scope(|scope| {
scope.spawn(|scope| {
let handle = scope.spawn(|_| 7);
sleep(Duration::from_millis(200));
handle.join().unwrap();
});
sleep(Duration::from_millis(100));
})
.unwrap();
}
|
