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use std::os::unix::io::{AsRawFd, RawFd};
use std::sync::atomic;
use std::{io, ptr};
use crate::register::execute;
use crate::register::Probe;
use crate::squeue::SubmissionQueue;
use crate::sys;
use crate::util::{cast_ptr, unsync_load, Fd};
pub struct Submitter<'a> {
fd: &'a Fd,
flags: u32,
sq_head: *const atomic::AtomicU32,
sq_tail: *const atomic::AtomicU32,
sq_flags: *const atomic::AtomicU32,
}
impl<'a> Submitter<'a> {
#[inline]
pub(crate) const fn new(fd: &'a Fd, flags: u32, sq: &SubmissionQueue) -> Submitter<'a> {
Submitter {
fd,
flags,
sq_head: sq.head,
sq_tail: sq.tail,
sq_flags: sq.flags,
}
}
fn sq_len(&self) -> usize {
unsafe {
let head = (*self.sq_head).load(atomic::Ordering::Acquire);
let tail = unsync_load(self.sq_tail);
tail.wrapping_sub(head) as usize
}
}
fn sq_need_wakeup(&self) -> bool {
unsafe {
(*self.sq_flags).load(atomic::Ordering::Acquire) & sys::IORING_SQ_NEED_WAKEUP != 0
}
}
pub unsafe fn enter(
&self,
to_submit: u32,
min_complete: u32,
flag: u32,
sig: Option<&libc::sigset_t>,
) -> io::Result<usize> {
let sig = sig.map(|sig| sig as *const _).unwrap_or_else(ptr::null);
let result = sys::io_uring_enter(self.fd.as_raw_fd(), to_submit, min_complete, flag, sig);
if result >= 0 {
Ok(result as _)
} else {
Err(io::Error::last_os_error())
}
}
#[inline]
pub fn submit(&self) -> io::Result<usize> {
self.submit_and_wait(0)
}
pub fn submit_and_wait(&self, want: usize) -> io::Result<usize> {
let len = self.sq_len();
let mut flags = 0;
if want > 0 {
flags |= sys::IORING_ENTER_GETEVENTS;
}
if self.flags & sys::IORING_SETUP_SQPOLL != 0 {
if self.sq_need_wakeup() {
flags |= sys::IORING_ENTER_SQ_WAKEUP;
} else if want == 0 {
return Ok(len);
}
}
unsafe { self.enter(len as _, want as _, flags, None) }
}
pub fn register_buffers(&self, bufs: &[libc::iovec]) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_REGISTER_BUFFERS,
bufs.as_ptr() as *const _,
bufs.len() as _,
)
.map(drop)
}
pub fn register_files(&self, fds: &[RawFd]) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_REGISTER_FILES,
fds.as_ptr() as *const _,
fds.len() as _,
)
.map(drop)
}
pub fn register_eventfd(&self, eventfd: RawFd) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_REGISTER_EVENTFD,
cast_ptr::<RawFd>(&eventfd) as *const _,
1,
)
.map(drop)
}
pub fn register_files_update(&self, offset: u32, fds: &[RawFd]) -> io::Result<usize> {
let fu = sys::io_uring_files_update {
offset,
resv: 0,
fds: fds.as_ptr() as _,
};
let fu = cast_ptr::<sys::io_uring_files_update>(&fu);
let ret = execute(
self.fd.as_raw_fd(),
sys::IORING_REGISTER_FILES_UPDATE,
fu as *const _,
fds.len() as _,
)?;
Ok(ret as _)
}
pub fn register_eventfd_async(&self, eventfd: RawFd) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_REGISTER_EVENTFD_ASYNC,
cast_ptr::<RawFd>(&eventfd) as *const _,
1,
)
.map(drop)
}
pub fn register_probe(&self, probe: &mut Probe) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_REGISTER_PROBE,
probe.as_mut_ptr() as *const _,
Probe::COUNT as _,
)
.map(drop)
}
pub fn register_personality(&self) -> io::Result<i32> {
execute(
self.fd.as_raw_fd(),
sys::IORING_REGISTER_PERSONALITY,
ptr::null(),
0,
)
}
pub fn unregister_buffers(&self) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_UNREGISTER_BUFFERS,
ptr::null(),
0,
)
.map(drop)
}
pub fn unregister_files(&self) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_UNREGISTER_FILES,
ptr::null(),
0,
)
.map(drop)
}
pub fn unregister_eventfd(&self) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_UNREGISTER_EVENTFD,
ptr::null(),
0,
)
.map(drop)
}
pub fn unregister_personality(&self, id: i32) -> io::Result<()> {
execute(
self.fd.as_raw_fd(),
sys::IORING_UNREGISTER_PERSONALITY,
ptr::null(),
id as _,
)
.map(drop)
}
}