Function scope_concurrency

src/scope.rs:1176–1202

()

        static THREAD_POOL: ThreadPool = ThreadPool::new();
        THREAD_POOL.resize_to_available();

        let mut string = "a";
        THREAD_POOL.scope(|scope| {
            scope.spawn(|_: &Worker| {
                string = "b";
            });
        });
        assert_eq!(string, "b");

        THREAD_POOL.depopulate();
    }

    /// Test that it is possible to borrow local data immutably within deeply
    /// nested scopes. This is also mostly here to ensure stuff like this
    /// compiles.
    #[test]
    fn scope_borrow_twice() {
        static THREAD_POOL: ThreadPool = ThreadPool::new();
        THREAD_POOL.resize_to_available();

        let counter = AtomicU8::new(0);
        THREAD_POOL.scope(|scope| {
            scope.spawn(|_: &Worker| {
                counter.fetch_add(1, Ordering::Relaxed);
                scope.spawn(|_: &Worker| {
                    counter.fetch_add(1, Ordering::Relaxed);
                });
            });
            scope.spawn(|_: &Worker| {
                counter.fetch_add(1, Ordering::Relaxed);