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
use super::*;
use log::debug;
use std::{collections::VecDeque, marker::PhantomPinned, pin::Pin, sync::Mutex};
pub struct SimpleAioWorkQueue {
worker: Pin<Box<AioQueue>>,
}
impl SimpleAioWorkQueue {
pub fn new() -> Result<Self> {
let worker = AioQueue::new()?;
Ok(Self { worker })
}
}
impl AioWorkQueue for SimpleAioWorkQueue {
fn push_back(&mut self, obj: AioWorkRequest) {
let inner: &mut _ = unsafe {
let mut_ref = Pin::as_mut(&mut self.worker);
Pin::get_unchecked_mut(mut_ref)
};
let mut shared = inner.shared.lock().unwrap();
match shared.state {
State::Idle => {
shared.state = State::Busy;
obj.begin(&inner.aio);
}
State::Busy => {}
}
shared.queue.push_back(obj);
}
}
#[derive(Debug, PartialEq)]
enum State {
Idle,
Busy,
}
impl Default for State {
fn default() -> Self {
State::Idle
}
}
#[derive(Default)]
struct SharedQueueData {
state: State,
queue: VecDeque<AioWorkRequest>,
}
struct AioQueue {
aio: NngAio,
shared: Mutex<SharedQueueData>,
_phantom: PhantomPinned,
}
impl AioQueue {
fn new_with_aio(aio: NngAio) -> AioQueue {
Self {
aio,
shared: Default::default(),
_phantom: PhantomPinned,
}
}
pub fn new() -> Result<AioArg<AioQueue>> {
NngAio::create(Self::new_with_aio, native_callback)
}
fn callback(&mut self) {
let mut shared = self.shared.lock().unwrap();
let front = shared.queue.pop_front();
if shared.state != State::Idle {
if let Some(mut front) = front {
front.finish(self.aio());
if let Some(next) = shared.queue.front() {
next.begin(self.aio());
} else {
shared.state = State::Idle;
}
return;
}
}
let res = unsafe { nng_int_to_result(nng_aio_result(self.aio.nng_aio())) };
debug!("Unexpected callback: {:?}", res);
}
}
impl Aio for AioQueue {
fn aio(&self) -> &NngAio {
&self.aio
}
fn aio_mut(&mut self) -> &mut NngAio {
&mut self.aio
}
}
impl std::fmt::Display for AioQueue {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "AioQueue {:?}", self.aio)
}
}
unsafe extern "C" fn native_callback(arg: AioArgPtr) {
let ctx = &mut *(arg as *mut AioQueue);
ctx.callback();
}