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
164
165
166
167
168
169
170
use std::fmt;
use std::io;
use std::ptr::{self, NonNull};
use std::marker::PhantomData;
use std::slice;
use std::time::Duration;
use std::sync::atomic::{self, Ordering};
use super::{IoUring, SQE, SQEs, resultify};
pub struct SubmissionQueue<'ring> {
ring: NonNull<uring_sys::io_uring>,
_marker: PhantomData<&'ring mut IoUring>,
}
impl<'ring> SubmissionQueue<'ring> {
pub(crate) fn new(ring: &'ring IoUring) -> SubmissionQueue<'ring> {
SubmissionQueue {
ring: NonNull::from(&ring.ring),
_marker: PhantomData,
}
}
pub fn prepare_sqe<'a>(&'a mut self) -> Option<SQE<'a>> {
unsafe {
prepare_sqe(self.ring.as_mut())
}
}
pub fn prepare_sqes<'a>(&'a mut self, count: u32) -> Option<SQEs<'a>> {
unsafe {
let sq: &mut uring_sys::io_uring_sq = &mut (*self.ring.as_ptr()).sq;
prepare_sqes(sq, count)
}
}
pub fn submit(&mut self) -> io::Result<u32> {
resultify(unsafe { uring_sys::io_uring_submit(self.ring.as_ptr()) })
}
pub fn submit_and_wait(&mut self, wait_for: u32) -> io::Result<u32> {
resultify(unsafe { uring_sys::io_uring_submit_and_wait(self.ring.as_ptr(), wait_for as _) })
}
pub fn submit_and_wait_with_timeout(&mut self, wait_for: u32, duration: Duration)
-> io::Result<u32>
{
let ts = uring_sys::__kernel_timespec {
tv_sec: duration.as_secs() as _,
tv_nsec: duration.subsec_nanos() as _
};
loop {
if let Some(mut sqe) = self.prepare_sqe() {
sqe.clear();
unsafe {
sqe.prep_timeout(&ts, 0, crate::sqe::TimeoutFlags::empty());
sqe.set_user_data(uring_sys::LIBURING_UDATA_TIMEOUT);
return resultify(uring_sys::io_uring_submit_and_wait(self.ring.as_ptr(), wait_for as _))
}
}
self.submit()?;
}
}
pub fn ready(&self) -> u32 {
unsafe { uring_sys::io_uring_sq_ready(self.ring.as_ptr()) as u32 }
}
pub fn space_left(&self) -> u32 {
unsafe { uring_sys::io_uring_sq_space_left(self.ring.as_ptr()) as u32 }
}
}
impl fmt::Debug for SubmissionQueue<'_> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let fd = unsafe { self.ring.as_ref().ring_fd };
f.debug_struct(std::any::type_name::<Self>()).field("fd", &fd).finish()
}
}
unsafe impl<'ring> Send for SubmissionQueue<'ring> { }
unsafe impl<'ring> Sync for SubmissionQueue<'ring> { }
pub(crate) unsafe fn prepare_sqe<'a>(ring: &mut uring_sys::io_uring) -> Option<SQE<'a>> {
let sqe = uring_sys::io_uring_get_sqe(ring);
if sqe != ptr::null_mut() {
let mut sqe = SQE::new(&mut *sqe);
sqe.clear();
Some(sqe)
} else {
None
}
}
pub(crate) unsafe fn prepare_sqes<'a>(sq: &mut uring_sys::io_uring_sq, count: u32)
-> Option<SQEs<'a>>
{
atomic::fence(Ordering::Acquire);
let head: u32 = *sq.khead;
let next: u32 = sq.sqe_tail + count;
if next - head <= *sq.kring_entries {
let sqe = sq.sqes.offset((sq.sqe_tail & *sq.kring_mask) as isize);
sq.sqe_tail = next;
Some(SQEs::new(slice::from_raw_parts_mut(sqe, count as usize)))
} else {
None
}
}