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extern crate atomic_refcell;
#[cfg(feature = "serde")]
extern crate serde;
use atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
#[derive(Debug)]
struct Foo {
u: u32,
}
#[derive(Debug)]
struct Bar {
f: Foo,
}
impl Default for Bar {
fn default() -> Self {
Bar { f: Foo { u: 42 } }
}
}
// FIXME(bholley): Add tests to exercise this in concurrent scenarios.
#[test]
fn immutable() {
let a = AtomicRefCell::new(Bar::default());
let _first = a.borrow();
let _second = a.borrow();
}
#[test]
fn try_immutable() {
let a = AtomicRefCell::new(Bar::default());
let _first = a.try_borrow().unwrap();
let _second = a.try_borrow().unwrap();
}
#[test]
fn mutable() {
let a = AtomicRefCell::new(Bar::default());
let _ = a.borrow_mut();
}
#[test]
fn try_mutable() {
let a = AtomicRefCell::new(Bar::default());
let _ = a.try_borrow_mut().unwrap();
}
#[test]
fn get_mut() {
let mut a = AtomicRefCell::new(Bar::default());
let _ = a.get_mut();
}
#[test]
fn interleaved() {
let a = AtomicRefCell::new(Bar::default());
{
let _ = a.borrow_mut();
}
{
let _first = a.borrow();
let _second = a.borrow();
}
{
let _ = a.borrow_mut();
}
}
#[test]
fn try_interleaved() {
let a = AtomicRefCell::new(Bar::default());
{
let _ = a.try_borrow_mut().unwrap();
}
{
let _first = a.try_borrow().unwrap();
let _second = a.try_borrow().unwrap();
let _ = a.try_borrow_mut().unwrap_err();
}
{
let _first = a.try_borrow_mut().unwrap();
let _ = a.try_borrow().unwrap_err();
}
}
// For Miri to catch issues when calling a function.
//
// See how this scenerio affects std::cell::RefCell implementation:
// https://github.com/rust-lang/rust/issues/63787
//
// Also see relevant unsafe code guidelines issue:
// https://github.com/rust-lang/unsafe-code-guidelines/issues/125
#[test]
fn drop_and_borrow_in_fn_call() {
fn drop_and_borrow(cell: &AtomicRefCell<Bar>, borrow: AtomicRef<'_, Bar>) {
drop(borrow);
*cell.borrow_mut() = Bar::default();
}
let a = AtomicRefCell::new(Bar::default());
let borrow = a.borrow();
drop_and_borrow(&a, borrow);
}
#[test]
#[should_panic(expected = "already immutably borrowed")]
fn immutable_then_mutable() {
let a = AtomicRefCell::new(Bar::default());
let _first = a.borrow();
let _second = a.borrow_mut();
}
#[test]
fn immutable_then_try_mutable() {
let a = AtomicRefCell::new(Bar::default());
let _first = a.borrow();
let _second = a.try_borrow_mut().unwrap_err();
}
#[test]
#[should_panic(expected = "already mutably borrowed")]
fn mutable_then_immutable() {
let a = AtomicRefCell::new(Bar::default());
let _first = a.borrow_mut();
let _second = a.borrow();
}
#[test]
fn mutable_then_try_immutable() {
let a = AtomicRefCell::new(Bar::default());
let _first = a.borrow_mut();
let _second = a.try_borrow().unwrap_err();
}
#[test]
#[should_panic(expected = "already mutably borrowed")]
fn double_mutable() {
let a = AtomicRefCell::new(Bar::default());
let _first = a.borrow_mut();
let _second = a.borrow_mut();
}
#[test]
fn mutable_then_try_mutable() {
let a = AtomicRefCell::new(Bar::default());
let _first = a.borrow_mut();
let _second = a.try_borrow_mut().unwrap_err();
}
#[test]
fn map() {
let a = AtomicRefCell::new(Bar::default());
let b = a.borrow();
assert_eq!(b.f.u, 42);
let c = AtomicRef::map(b, |x| &x.f);
assert_eq!(c.u, 42);
let d = AtomicRef::map(c, |x| &x.u);
assert_eq!(*d, 42);
}
#[test]
fn map_mut() {
let a = AtomicRefCell::new(Bar::default());
let mut b = a.borrow_mut();
assert_eq!(b.f.u, 42);
b.f.u = 43;
let mut c = AtomicRefMut::map(b, |x| &mut x.f);
assert_eq!(c.u, 43);
c.u = 44;
let mut d = AtomicRefMut::map(c, |x| &mut x.u);
assert_eq!(*d, 44);
*d = 45;
assert_eq!(*d, 45);
}
#[test]
fn debug_fmt() {
let a = AtomicRefCell::new(Foo { u: 42 });
assert_eq!(format!("{:?}", a), "AtomicRefCell { value: Foo { u: 42 } }");
}
#[test]
fn debug_fmt_borrowed() {
let a = AtomicRefCell::new(Foo { u: 42 });
let _b = a.borrow();
assert_eq!(format!("{:?}", a), "AtomicRefCell { value: Foo { u: 42 } }");
}
#[test]
fn debug_fmt_borrowed_mut() {
let a = AtomicRefCell::new(Foo { u: 42 });
let _b = a.borrow_mut();
assert_eq!(format!("{:?}", a), "AtomicRefCell { value: <borrowed> }");
}
#[test]
#[cfg(feature = "serde")]
fn serde() {
let value = 10;
let cell = AtomicRefCell::new(value);
let serialized = serde_json::to_string(&cell).unwrap();
let deserialized = serde_json::from_str::<AtomicRefCell<usize>>(&serialized).unwrap();
assert_eq!(*deserialized.borrow(), value);
}
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