linux-io-uring 0.0.4

The `io_uring` library for Rust.
Documentation 
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

use linux_io_uring::{ opcode, squeue, IoUring };


#[test]
fn test_io_drain() -> anyhow::Result<()> {
    let mut io_uring = IoUring::new(4)?;

    unsafe {
        let mut queue = io_uring.submission().available();
        queue.push(opcode::Nop::new().build().user_data(0x01))
            .map_err(drop)
            .expect("queue is full");
        queue.push(opcode::Nop::new().build().user_data(0x02))
            .map_err(drop)
            .expect("queue is full");
        queue.push(opcode::Nop::new().build().user_data(0x03).flags(squeue::Flags::IO_DRAIN))
            .map_err(drop)
            .expect("queue is full");
        queue.push(opcode::Nop::new().build().user_data(0x04))
            .map_err(drop)
            .expect("queue is full");
    }

    io_uring.submit_and_wait(4)?;

    let cqes = io_uring
        .completion()
        .available()
        .map(|entry| entry.user_data())
        .collect::<Vec<_>>();

    assert!(cqes[0] == 0x01 || cqes[0] == 0x02);
    assert!(cqes[1] == 0x01 || cqes[1] == 0x02);
    assert_ne!(cqes[0], cqes[1]);
    assert_eq!(cqes[2], 0x03);
    assert_eq!(cqes[3], 0x04);

    Ok(())
}

#[test]
fn test_io_link() -> anyhow::Result<()> {
    let mut io_uring = IoUring::new(4)?;

    unsafe {
        let mut queue = io_uring.submission().available();
        queue.push(opcode::Nop::new().build().user_data(0x01).flags(squeue::Flags::IO_LINK))
            .map_err(drop)
            .expect("queue is full");
        queue.push(opcode::Nop::new().build().user_data(0x02).flags(squeue::Flags::IO_LINK))
            .map_err(drop)
            .expect("queue is full");
        queue.push(opcode::Nop::new().build().user_data(0x03).flags(squeue::Flags::IO_LINK))
            .map_err(drop)
            .expect("queue is full");
        queue.push(opcode::Nop::new().build().user_data(0x04))
            .map_err(drop)
            .expect("queue is full");
    }

    io_uring.submit_and_wait(4)?;

    let cqes = io_uring
        .completion()
        .available()
        .map(|entry| entry.user_data())
        .collect::<Vec<_>>();

    assert_eq!(cqes, [0x01, 0x02, 0x03, 0x04]);

    Ok(())
}