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use std::io;
use std::time::Duration;
use super::DriverContext;
use crate::io::Cqe;
pub trait Completion {
fn drain(&mut self, buf: &mut [Cqe]) -> usize;
fn wait(&mut self, timeout: Option<Duration>) -> io::Result<()>;
}
cfg_select! {
target_os = "linux" => {
use io_uring::types::{SubmitArgs, Timespec};
use crate::backend::uring::driver::{Disposition, Uring};
impl Completion for DriverContext<'_, '_> {
fn drain(&mut self, buf: &mut [Cqe]) -> usize {
self.flush_returned_buffers();
let state = self.backend();
let mut n = 0;
{
let Uring {
uring,
setsockopt,
files,
provided,
routes,
..
} = state;
let mut cq = uring.completion();
while n < buf.len() {
let Some(item) = cq.next() else { break };
let result = item.result();
let user_data = match Uring::complete_cqe(
setsockopt,
files,
routes,
item.user_data(),
result,
item.flags(),
) {
Disposition::Drop | Disposition::Internal => continue,
Disposition::DropBuffer(bid) => {
provided.defer(bid);
continue;
}
Disposition::Public(user_data) => user_data,
};
buf[n] = Cqe {
user_data,
result,
flags: item.flags(),
};
n += 1;
}
cq.sync();
}
state.flush_deferred_close();
state.flush_ready_create();
state.provided.flush();
n
}
fn wait(&mut self, timeout: Option<Duration>) -> io::Result<()> {
self.flush_returned_buffers();
let state = self.backend();
state.flush_deferred_close();
state.flush_ready_create();
state.provided.flush();
match timeout {
Some(timeout) => {
let timespec = Timespec::from(timeout);
let args = SubmitArgs::new().timespec(×pec);
match state.uring.submitter().submit_with_args(1, &args) {
Ok(_) => Ok(()),
Err(error) if error.raw_os_error() == Some(libc::ETIME) => Ok(()),
Err(error) => Err(error),
}
}
None => state.uring.submitter().submit_and_wait(1).map(|_| ()),
}
}
}
}
_ => {
use std::mem::MaybeUninit;
use std::slice;
use crate::backend::kqueue::driver::MAX_DRAIN_PER_FD;
use crate::backend::kqueue::driver::pending::PendingCompletion;
use crate::backend::kqueue::driver::read::dispatch::Dispatch;
use crate::driver::token::SHUTDOWN;
use crate::io::{BUFFER, BUFFER_SHIFT, MORE};
impl Completion for DriverContext<'_, '_> {
fn drain(&mut self, buf: &mut [Cqe]) -> usize {
self.flush_returned_buffers();
if self.backend_ref().pending.is_empty() {
let _ = Completion::wait(self, Some(Duration::ZERO));
}
let state = self.backend();
let mut n = 0;
while n < buf.len() {
let Some(pending) = state.pending.pop_front() else {
break;
};
buf[n] = match pending {
PendingCompletion::Accept { ud, result, more } => Cqe {
user_data: ud.raw(),
result,
flags: if more { MORE } else { 0 },
},
PendingCompletion::Recv {
ud,
result,
more,
bid,
} => {
let mut flags = if more { MORE } else { 0 };
if let Some(bid) = bid {
flags |= BUFFER | ((bid as u32) << BUFFER_SHIFT);
}
Cqe {
user_data: ud.raw(),
result,
flags,
}
}
PendingCompletion::Write { ud, result } => Cqe {
user_data: ud.raw(),
result,
flags: 0,
},
PendingCompletion::Create { ud, result, .. } => Cqe {
user_data: ud.raw(),
result,
flags: 0,
},
PendingCompletion::Timer { ud } => Cqe {
user_data: ud.raw(),
result: 0,
flags: 0,
},
PendingCompletion::Shutdown => Cqe {
user_data: SHUTDOWN.raw(),
result: 0,
flags: 0,
},
};
n += 1;
}
n
}
fn wait(&mut self, timeout: Option<Duration>) -> io::Result<()> {
self.flush_returned_buffers();
let state = self.backend();
state.resume_pending();
let mut events: [MaybeUninit<libc::kevent>; 64] = [const { MaybeUninit::uninit() }; 64];
if state.pending.remaining_capacity() < events.len() * MAX_DRAIN_PER_FD {
return Ok(());
}
let n = state.kevent_call(&mut events, timeout)?;
let ready = unsafe { slice::from_raw_parts(events.as_ptr().cast::<libc::kevent>(), n) };
for event in ready {
state.dispatch_event(event);
}
Ok(())
}
}
}
}