324 lines
7.4 KiB
Rust
324 lines
7.4 KiB
Rust
use crate::{
|
|
lazy::{Lazy, SyncLazy, SyncOnceCell},
|
|
panic,
|
|
sync::{
|
|
atomic::{AtomicUsize, Ordering::SeqCst},
|
|
mpsc::channel,
|
|
Mutex,
|
|
},
|
|
thread,
|
|
};
|
|
|
|
#[test]
|
|
fn lazy_default() {
|
|
static CALLED: AtomicUsize = AtomicUsize::new(0);
|
|
|
|
struct Foo(u8);
|
|
impl Default for Foo {
|
|
fn default() -> Self {
|
|
CALLED.fetch_add(1, SeqCst);
|
|
Foo(42)
|
|
}
|
|
}
|
|
|
|
let lazy: Lazy<Mutex<Foo>> = <_>::default();
|
|
|
|
assert_eq!(CALLED.load(SeqCst), 0);
|
|
|
|
assert_eq!(lazy.lock().unwrap().0, 42);
|
|
assert_eq!(CALLED.load(SeqCst), 1);
|
|
|
|
lazy.lock().unwrap().0 = 21;
|
|
|
|
assert_eq!(lazy.lock().unwrap().0, 21);
|
|
assert_eq!(CALLED.load(SeqCst), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn lazy_poisoning() {
|
|
let x: Lazy<String> = Lazy::new(|| panic!("kaboom"));
|
|
for _ in 0..2 {
|
|
let res = panic::catch_unwind(panic::AssertUnwindSafe(|| x.len()));
|
|
assert!(res.is_err());
|
|
}
|
|
}
|
|
|
|
fn spawn_and_wait<R: Send + 'static>(f: impl FnOnce() -> R + Send + 'static) -> R {
|
|
thread::spawn(f).join().unwrap()
|
|
}
|
|
|
|
#[test]
|
|
fn sync_once_cell() {
|
|
static ONCE_CELL: SyncOnceCell<i32> = SyncOnceCell::new();
|
|
|
|
assert!(ONCE_CELL.get().is_none());
|
|
|
|
spawn_and_wait(|| {
|
|
ONCE_CELL.get_or_init(|| 92);
|
|
assert_eq!(ONCE_CELL.get(), Some(&92));
|
|
});
|
|
|
|
ONCE_CELL.get_or_init(|| panic!("Kabom!"));
|
|
assert_eq!(ONCE_CELL.get(), Some(&92));
|
|
}
|
|
|
|
#[test]
|
|
fn sync_once_cell_get_mut() {
|
|
let mut c = SyncOnceCell::new();
|
|
assert!(c.get_mut().is_none());
|
|
c.set(90).unwrap();
|
|
*c.get_mut().unwrap() += 2;
|
|
assert_eq!(c.get_mut(), Some(&mut 92));
|
|
}
|
|
|
|
#[test]
|
|
fn sync_once_cell_get_unchecked() {
|
|
let c = SyncOnceCell::new();
|
|
c.set(92).unwrap();
|
|
unsafe {
|
|
assert_eq!(c.get_unchecked(), &92);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn sync_once_cell_drop() {
|
|
static DROP_CNT: AtomicUsize = AtomicUsize::new(0);
|
|
struct Dropper;
|
|
impl Drop for Dropper {
|
|
fn drop(&mut self) {
|
|
DROP_CNT.fetch_add(1, SeqCst);
|
|
}
|
|
}
|
|
|
|
let x = SyncOnceCell::new();
|
|
spawn_and_wait(move || {
|
|
x.get_or_init(|| Dropper);
|
|
assert_eq!(DROP_CNT.load(SeqCst), 0);
|
|
drop(x);
|
|
});
|
|
|
|
assert_eq!(DROP_CNT.load(SeqCst), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn sync_once_cell_drop_empty() {
|
|
let x = SyncOnceCell::<String>::new();
|
|
drop(x);
|
|
}
|
|
|
|
#[test]
|
|
fn clone() {
|
|
let s = SyncOnceCell::new();
|
|
let c = s.clone();
|
|
assert!(c.get().is_none());
|
|
|
|
s.set("hello".to_string()).unwrap();
|
|
let c = s.clone();
|
|
assert_eq!(c.get().map(String::as_str), Some("hello"));
|
|
}
|
|
|
|
#[test]
|
|
fn get_or_try_init() {
|
|
let cell: SyncOnceCell<String> = SyncOnceCell::new();
|
|
assert!(cell.get().is_none());
|
|
|
|
let res = panic::catch_unwind(|| cell.get_or_try_init(|| -> Result<_, ()> { panic!() }));
|
|
assert!(res.is_err());
|
|
assert!(!cell.is_initialized());
|
|
assert!(cell.get().is_none());
|
|
|
|
assert_eq!(cell.get_or_try_init(|| Err(())), Err(()));
|
|
|
|
assert_eq!(cell.get_or_try_init(|| Ok::<_, ()>("hello".to_string())), Ok(&"hello".to_string()));
|
|
assert_eq!(cell.get(), Some(&"hello".to_string()));
|
|
}
|
|
|
|
#[test]
|
|
fn from_impl() {
|
|
assert_eq!(SyncOnceCell::from("value").get(), Some(&"value"));
|
|
assert_ne!(SyncOnceCell::from("foo").get(), Some(&"bar"));
|
|
}
|
|
|
|
#[test]
|
|
fn partialeq_impl() {
|
|
assert!(SyncOnceCell::from("value") == SyncOnceCell::from("value"));
|
|
assert!(SyncOnceCell::from("foo") != SyncOnceCell::from("bar"));
|
|
|
|
assert!(SyncOnceCell::<String>::new() == SyncOnceCell::new());
|
|
assert!(SyncOnceCell::<String>::new() != SyncOnceCell::from("value".to_owned()));
|
|
}
|
|
|
|
#[test]
|
|
fn into_inner() {
|
|
let cell: SyncOnceCell<String> = SyncOnceCell::new();
|
|
assert_eq!(cell.into_inner(), None);
|
|
let cell = SyncOnceCell::new();
|
|
cell.set("hello".to_string()).unwrap();
|
|
assert_eq!(cell.into_inner(), Some("hello".to_string()));
|
|
}
|
|
|
|
#[test]
|
|
fn sync_lazy_new() {
|
|
static CALLED: AtomicUsize = AtomicUsize::new(0);
|
|
static SYNC_LAZY: SyncLazy<i32> = SyncLazy::new(|| {
|
|
CALLED.fetch_add(1, SeqCst);
|
|
92
|
|
});
|
|
|
|
assert_eq!(CALLED.load(SeqCst), 0);
|
|
|
|
spawn_and_wait(|| {
|
|
let y = *SYNC_LAZY - 30;
|
|
assert_eq!(y, 62);
|
|
assert_eq!(CALLED.load(SeqCst), 1);
|
|
});
|
|
|
|
let y = *SYNC_LAZY - 30;
|
|
assert_eq!(y, 62);
|
|
assert_eq!(CALLED.load(SeqCst), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn sync_lazy_default() {
|
|
static CALLED: AtomicUsize = AtomicUsize::new(0);
|
|
|
|
struct Foo(u8);
|
|
impl Default for Foo {
|
|
fn default() -> Self {
|
|
CALLED.fetch_add(1, SeqCst);
|
|
Foo(42)
|
|
}
|
|
}
|
|
|
|
let lazy: SyncLazy<Mutex<Foo>> = <_>::default();
|
|
|
|
assert_eq!(CALLED.load(SeqCst), 0);
|
|
|
|
assert_eq!(lazy.lock().unwrap().0, 42);
|
|
assert_eq!(CALLED.load(SeqCst), 1);
|
|
|
|
lazy.lock().unwrap().0 = 21;
|
|
|
|
assert_eq!(lazy.lock().unwrap().0, 21);
|
|
assert_eq!(CALLED.load(SeqCst), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn static_sync_lazy() {
|
|
static XS: SyncLazy<Vec<i32>> = SyncLazy::new(|| {
|
|
let mut xs = Vec::new();
|
|
xs.push(1);
|
|
xs.push(2);
|
|
xs.push(3);
|
|
xs
|
|
});
|
|
|
|
spawn_and_wait(|| {
|
|
assert_eq!(&*XS, &vec![1, 2, 3]);
|
|
});
|
|
|
|
assert_eq!(&*XS, &vec![1, 2, 3]);
|
|
}
|
|
|
|
#[test]
|
|
fn static_sync_lazy_via_fn() {
|
|
fn xs() -> &'static Vec<i32> {
|
|
static XS: SyncOnceCell<Vec<i32>> = SyncOnceCell::new();
|
|
XS.get_or_init(|| {
|
|
let mut xs = Vec::new();
|
|
xs.push(1);
|
|
xs.push(2);
|
|
xs.push(3);
|
|
xs
|
|
})
|
|
}
|
|
assert_eq!(xs(), &vec![1, 2, 3]);
|
|
}
|
|
|
|
#[test]
|
|
fn sync_lazy_poisoning() {
|
|
let x: SyncLazy<String> = SyncLazy::new(|| panic!("kaboom"));
|
|
for _ in 0..2 {
|
|
let res = panic::catch_unwind(|| x.len());
|
|
assert!(res.is_err());
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn is_sync_send() {
|
|
fn assert_traits<T: Send + Sync>() {}
|
|
assert_traits::<SyncOnceCell<String>>();
|
|
assert_traits::<SyncLazy<String>>();
|
|
}
|
|
|
|
#[test]
|
|
fn eval_once_macro() {
|
|
macro_rules! eval_once {
|
|
(|| -> $ty:ty {
|
|
$($body:tt)*
|
|
}) => {{
|
|
static ONCE_CELL: SyncOnceCell<$ty> = SyncOnceCell::new();
|
|
fn init() -> $ty {
|
|
$($body)*
|
|
}
|
|
ONCE_CELL.get_or_init(init)
|
|
}};
|
|
}
|
|
|
|
let fib: &'static Vec<i32> = eval_once! {
|
|
|| -> Vec<i32> {
|
|
let mut res = vec![1, 1];
|
|
for i in 0..10 {
|
|
let next = res[i] + res[i + 1];
|
|
res.push(next);
|
|
}
|
|
res
|
|
}
|
|
};
|
|
assert_eq!(fib[5], 8)
|
|
}
|
|
|
|
#[test]
|
|
fn sync_once_cell_does_not_leak_partially_constructed_boxes() {
|
|
static ONCE_CELL: SyncOnceCell<String> = SyncOnceCell::new();
|
|
|
|
let n_readers = 10;
|
|
let n_writers = 3;
|
|
const MSG: &str = "Hello, World";
|
|
|
|
let (tx, rx) = channel();
|
|
|
|
for _ in 0..n_readers {
|
|
let tx = tx.clone();
|
|
thread::spawn(move || {
|
|
loop {
|
|
if let Some(msg) = ONCE_CELL.get() {
|
|
tx.send(msg).unwrap();
|
|
break;
|
|
}
|
|
#[cfg(target_env = "sgx")]
|
|
crate::thread::yield_now();
|
|
}
|
|
});
|
|
}
|
|
for _ in 0..n_writers {
|
|
thread::spawn(move || {
|
|
let _ = ONCE_CELL.set(MSG.to_owned());
|
|
});
|
|
}
|
|
|
|
for _ in 0..n_readers {
|
|
let msg = rx.recv().unwrap();
|
|
assert_eq!(msg, MSG);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn dropck() {
|
|
let cell = SyncOnceCell::new();
|
|
{
|
|
let s = String::new();
|
|
cell.set(&s).unwrap();
|
|
}
|
|
}
|