1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
//@ run-pass
#![allow(dead_code)]
#![allow(unused_assignments)]
#![allow(unused_variables)]
//@ ignore-emscripten no threads support
//@ needs-unwind
use std::thread;
use std::sync::mpsc::{channel, Sender};
#[derive(PartialEq, Debug)]
enum Message {
Dropped,
DestructorRan
}
struct SendOnDrop {
sender: Sender<Message>
}
impl Drop for SendOnDrop {
fn drop(&mut self) {
self.sender.send(Message::Dropped).unwrap();
}
}
enum Foo {
SimpleVariant(Sender<Message>),
NestedVariant(Box<usize>, SendOnDrop, Sender<Message>),
FailingVariant { on_drop: SendOnDrop }
}
impl Drop for Foo {
fn drop(&mut self) {
match self {
&mut Foo::SimpleVariant(ref mut sender) => {
sender.send(Message::DestructorRan).unwrap();
}
&mut Foo::NestedVariant(_, _, ref mut sender) => {
sender.send(Message::DestructorRan).unwrap();
}
&mut Foo::FailingVariant { .. } => {
panic!("Failed");
}
}
}
}
pub fn main() {
let (sender, receiver) = channel();
{
let v = Foo::SimpleVariant(sender);
}
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().ok(), None);
let (sender, receiver) = channel();
{
let v = Foo::NestedVariant(Box::new(42), SendOnDrop { sender: sender.clone() }, sender);
}
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().ok(), None);
let (sender, receiver) = channel();
let t = thread::spawn(move|| {
let v = Foo::FailingVariant { on_drop: SendOnDrop { sender: sender } };
});
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().ok(), None);
drop(t.join());
let (sender, receiver) = channel();
let t = {
thread::spawn(move|| {
let mut v = Foo::NestedVariant(Box::new(42), SendOnDrop {
sender: sender.clone()
}, sender.clone());
v = Foo::NestedVariant(Box::new(42),
SendOnDrop { sender: sender.clone() },
sender.clone());
v = Foo::SimpleVariant(sender.clone());
v = Foo::FailingVariant { on_drop: SendOnDrop { sender: sender } };
})
};
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().unwrap(), Message::DestructorRan);
assert_eq!(receiver.recv().unwrap(), Message::Dropped);
assert_eq!(receiver.recv().ok(), None);
drop(t.join());
}
|
