use std::io;
use std::sync::atomic::Ordering;
#[cfg(feature = "io_timeout")]
use std::time::Duration;
use super::super::{co_io_result, from_nix_error, IoData};
#[cfg(feature = "io_cancel")]
use crate::coroutine_impl::co_cancel_data;
use crate::coroutine_impl::{is_coroutine, CoroutineImpl, EventSource};
use crate::io::AsIoData;
use crate::yield_now::yield_with_io;
use nix::unistd::read;
pub struct SocketRead<'a> {
io_data: &'a IoData,
buf: &'a mut [u8],
#[cfg(feature = "io_timeout")]
timeout: Option<Duration>,
pub(crate) is_coroutine: bool,
}
impl<'a> SocketRead<'a> {
pub fn new<T: AsIoData>(
s: &'a T,
buf: &'a mut [u8],
#[cfg(feature = "io_timeout")] timeout: Option<Duration>,
) -> Self {
SocketRead {
io_data: s.as_io_data(),
buf,
#[cfg(feature = "io_timeout")]
timeout,
is_coroutine: is_coroutine(),
}
}
pub fn done(&mut self) -> io::Result<usize> {
loop {
co_io_result(self.is_coroutine)?;
self.io_data.io_flag.store(false, Ordering::Relaxed);
match read(self.io_data.fd, self.buf) {
Ok(n) => return Ok(n),
Err(e) => {
if e == nix::errno::Errno::EAGAIN {
} else {
return Err(from_nix_error(e));
}
}
}
if self.io_data.io_flag.load(Ordering::Relaxed) {
continue;
}
yield_with_io(self, self.is_coroutine);
}
}
}
impl<'a> EventSource for SocketRead<'a> {
fn subscribe(&mut self, co: CoroutineImpl) {
#[cfg(feature = "io_cancel")]
let cancel = co_cancel_data(&co);
let io_data = self.io_data;
#[cfg(feature = "io_timeout")]
if let Some(dur) = self.timeout {
crate::scheduler::get_scheduler()
.get_selector()
.add_io_timer(self.io_data, dur);
}
io_data.co.store(co);
if io_data.io_flag.load(Ordering::Acquire) {
#[allow(clippy::needless_return)]
return io_data.fast_schedule();
}
#[cfg(feature = "io_cancel")]
{
cancel.set_io((*io_data).clone());
if cancel.is_canceled() {
unsafe { cancel.cancel() };
}
}
}
}