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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
use std::{
collections::HashMap,
io::Result as IoResult,
sync::{
atomic::{AtomicUsize, Ordering},
mpsc::{Receiver, Sender},
Arc, Mutex,
},
task::Waker,
time::Duration,
};
use futures::io::Error as FutIoError;
use log::error;
use mio::{Evented, Events, PollOpt, Ready, Token as MioToken};
type FutIoResult<T> = Result<T, FutIoError>;
pub mod tcp;
#[derive(Clone)]
pub struct PollBundle {
events: Arc<Mutex<Events>>,
poll: Arc<mio::Poll>,
timeout: Option<Duration>,
token_counter: Arc<AtomicUsize>,
token_freed: Arc<Mutex<Receiver<usize>>>,
token_drop_box: Sender<usize>,
wakers: Arc<Mutex<HashMap<usize, Arc<Mutex<Option<Waker>>>>>>,
}
pub struct Token {
val: usize,
drop_box: Sender<usize>,
bundle: PollBundle,
}
impl Token {
pub fn get_mio(&self) -> MioToken {
MioToken(self.val)
}
}
impl PartialEq<MioToken> for Token {
fn eq(&self, other: &MioToken) -> bool {
self.val == other.0
}
}
impl PartialEq<Token> for MioToken {
fn eq(&self, other: &Token) -> bool {
self.0 == other.val
}
}
impl Drop for Token {
fn drop(&mut self) {
let _ = self.bundle.wakers.lock().map(|mut g| g.remove(&self.val));
let _ = self.drop_box.send(self.val);
}
}
impl PollBundle {
pub fn new(
timeout: impl Into<Option<Duration>>,
event_buf_size: usize,
) -> IoResult<PollBundle> {
let (tx, rx) = std::sync::mpsc::channel();
Ok(PollBundle {
events: Arc::new(Mutex::new(Events::with_capacity(event_buf_size))),
poll: Arc::new(mio::Poll::new()?),
timeout: timeout.into(),
token_counter: Arc::new(AtomicUsize::new(0)),
token_freed: Arc::new(Mutex::new(rx)),
token_drop_box: tx,
wakers: Default::default(),
})
}
fn get_token(&self) -> Token {
let val = match self
.token_freed
.lock()
.expect("Poisoned token channel")
.try_recv()
{
Err(_) => self.token_counter.fetch_add(1, Ordering::AcqRel),
Ok(val) => val,
};
Token {
val,
drop_box: self.token_drop_box.clone(),
bundle: self.clone(),
}
}
pub fn iter(&self) -> IoResult<()> {
let events = &mut *self.events.lock().expect("Poisoned PollBundle");
self.poll.poll(events, self.timeout)?;
let wakers = self.wakers.lock().expect("Poisoned PollBundle");
for event in events.iter() {
if let Some(waker) = wakers.get(&event.token().0) {
match waker.lock() {
Ok(w) => {
w.as_ref().map(Waker::wake_by_ref);
}
Err(_) => {
error!("Ignoring panicked waker. This should be handled by the future.")
}
}
} else {
error!("Registered handler does not have a corresponding Waker. This is a bug.")
}
}
Ok(())
}
pub fn register<E: ?Sized>(
&self,
handle: &E,
interest: Ready,
opts: PollOpt,
waker_ptr: Arc<Mutex<Option<Waker>>>,
) -> IoResult<Token>
where
E: Evented,
{
let token = self.get_token();
self.poll
.register(handle, token.get_mio(), interest, opts)?;
self.wakers
.lock()
.expect("Poisoned PollBundle")
.insert(token.val, waker_ptr);
Ok(token)
}
}
#[cfg(test)]
mod tests {}