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use crate::cell::{Cell, UnsafeCell};
use crate::sync::mpsc::{channel, Sender};
use crate::thread;
use crate::thread_local;
struct Foo(Sender<()>);
impl Drop for Foo {
fn drop(&mut self) {
let Foo(ref s) = *self;
s.send(()).unwrap();
}
}
#[test]
fn smoke_no_dtor() {
thread_local!(static FOO: Cell<i32> = Cell::new(1));
FOO.with(|f| {
assert_eq!(f.get(), 1);
f.set(2);
});
let (tx, rx) = channel();
let _t = thread::spawn(move || {
FOO.with(|f| {
assert_eq!(f.get(), 1);
});
tx.send(()).unwrap();
});
rx.recv().unwrap();
FOO.with(|f| {
assert_eq!(f.get(), 2);
});
}
#[test]
fn states() {
struct Foo;
impl Drop for Foo {
fn drop(&mut self) {
assert!(FOO.try_with(|_| ()).is_err());
}
}
thread_local!(static FOO: Foo = Foo);
thread::spawn(|| {
assert!(FOO.try_with(|_| ()).is_ok());
})
.join()
.ok()
.expect("thread panicked");
}
#[test]
fn smoke_dtor() {
thread_local!(static FOO: UnsafeCell<Option<Foo>> = UnsafeCell::new(None));
let (tx, rx) = channel();
let _t = thread::spawn(move || unsafe {
let mut tx = Some(tx);
FOO.with(|f| {
*f.get() = Some(Foo(tx.take().unwrap()));
});
});
rx.recv().unwrap();
}
#[test]
fn circular() {
struct S1;
struct S2;
thread_local!(static K1: UnsafeCell<Option<S1>> = UnsafeCell::new(None));
thread_local!(static K2: UnsafeCell<Option<S2>> = UnsafeCell::new(None));
static mut HITS: u32 = 0;
impl Drop for S1 {
fn drop(&mut self) {
unsafe {
HITS += 1;
if K2.try_with(|_| ()).is_err() {
assert_eq!(HITS, 3);
} else {
if HITS == 1 {
K2.with(|s| *s.get() = Some(S2));
} else {
assert_eq!(HITS, 3);
}
}
}
}
}
impl Drop for S2 {
fn drop(&mut self) {
unsafe {
HITS += 1;
assert!(K1.try_with(|_| ()).is_ok());
assert_eq!(HITS, 2);
K1.with(|s| *s.get() = Some(S1));
}
}
}
thread::spawn(move || {
drop(S1);
})
.join()
.ok()
.expect("thread panicked");
}
#[test]
fn self_referential() {
struct S1;
thread_local!(static K1: UnsafeCell<Option<S1>> = UnsafeCell::new(None));
impl Drop for S1 {
fn drop(&mut self) {
assert!(K1.try_with(|_| ()).is_err());
}
}
thread::spawn(move || unsafe {
K1.with(|s| *s.get() = Some(S1));
})
.join()
.ok()
.expect("thread panicked");
}
// Note that this test will deadlock if TLS destructors aren't run (this
// requires the destructor to be run to pass the test).
#[test]
fn dtors_in_dtors_in_dtors() {
struct S1(Sender<()>);
thread_local!(static K1: UnsafeCell<Option<S1>> = UnsafeCell::new(None));
thread_local!(static K2: UnsafeCell<Option<Foo>> = UnsafeCell::new(None));
impl Drop for S1 {
fn drop(&mut self) {
let S1(ref tx) = *self;
unsafe {
let _ = K2.try_with(|s| *s.get() = Some(Foo(tx.clone())));
}
}
}
let (tx, rx) = channel();
let _t = thread::spawn(move || unsafe {
let mut tx = Some(tx);
K1.with(|s| *s.get() = Some(S1(tx.take().unwrap())));
});
rx.recv().unwrap();
}
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