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Replace mio polling with filedescriptor's poll() (#735)

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Jonathan 2023-01-11 21:15:32 +02:00 committed by GitHub
parent 3fe13e18d8
commit 05229b71f9
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9 changed files with 611 additions and 276 deletions
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4
Cargo.toml
View File

@ -29,6 +29,7 @@ all-features = true
default = ["bracketed-paste"]
bracketed-paste = []
event-stream = ["futures-core"]
use-dev-tty = ["filedescriptor"]
#
# Shared dependencies
@ -56,8 +57,9 @@ crossterm_winapi = "0.9"
#
[target.'cfg(unix)'.dependencies]
libc = "0.2"
mio = { version = "0.8", features = ["os-poll"] }
signal-hook = { version = "0.3.13" }
filedescriptor = { version = "0.8", optional = true }
mio = { version = "0.8", features = ["os-poll"] }
signal-hook-mio = { version = "0.2.3", features = ["support-v0_8"] }
#

246
src/event/source/unix.rs
View File

@ -1,241 +1,11 @@
use std::{collections::VecDeque, io, time::Duration};
#[cfg(feature = "use-dev-tty")]
pub(crate) mod tty;
use mio::{unix::SourceFd, Events, Interest, Poll, Token};
use signal_hook_mio::v0_8::Signals;
#[cfg(not(feature = "use-dev-tty"))]
pub(crate) mod mio;
use crate::Result;
#[cfg(feature = "use-dev-tty")]
pub(crate) use self::tty::UnixInternalEventSource;
#[cfg(feature = "event-stream")]
use super::super::sys::Waker;
use super::super::{
source::EventSource,
sys::unix::{
file_descriptor::{tty_fd, FileDesc},
parse::parse_event,
},
timeout::PollTimeout,
Event, InternalEvent,
};
// Tokens to identify file descriptor
const TTY_TOKEN: Token = Token(0);
const SIGNAL_TOKEN: Token = Token(1);
#[cfg(feature = "event-stream")]
const WAKE_TOKEN: Token = Token(2);
// I (@zrzka) wasn't able to read more than 1_022 bytes when testing
// reading on macOS/Linux -> we don't need bigger buffer and 1k of bytes
// is enough.
const TTY_BUFFER_SIZE: usize = 1_024;
pub(crate) struct UnixInternalEventSource {
poll: Poll,
events: Events,
parser: Parser,
tty_buffer: [u8; TTY_BUFFER_SIZE],
tty_fd: FileDesc,
signals: Signals,
#[cfg(feature = "event-stream")]
waker: Waker,
}
impl UnixInternalEventSource {
pub fn new() -> Result<Self> {
UnixInternalEventSource::from_file_descriptor(tty_fd()?)
}
pub(crate) fn from_file_descriptor(input_fd: FileDesc) -> Result<Self> {
let poll = Poll::new()?;
let registry = poll.registry();
let tty_raw_fd = input_fd.raw_fd();
let mut tty_ev = SourceFd(&tty_raw_fd);
registry.register(&mut tty_ev, TTY_TOKEN, Interest::READABLE)?;
let mut signals = Signals::new(&[signal_hook::consts::SIGWINCH])?;
registry.register(&mut signals, SIGNAL_TOKEN, Interest::READABLE)?;
#[cfg(feature = "event-stream")]
let waker = Waker::new(registry, WAKE_TOKEN)?;
Ok(UnixInternalEventSource {
poll,
events: Events::with_capacity(3),
parser: Parser::default(),
tty_buffer: [0u8; TTY_BUFFER_SIZE],
tty_fd: input_fd,
signals,
#[cfg(feature = "event-stream")]
waker,
})
}
}
impl EventSource for UnixInternalEventSource {
fn try_read(&mut self, timeout: Option<Duration>) -> Result<Option<InternalEvent>> {
if let Some(event) = self.parser.next() {
return Ok(Some(event));
}
let timeout = PollTimeout::new(timeout);
loop {
if let Err(e) = self.poll.poll(&mut self.events, timeout.leftover()) {
// Mio will throw an interrupted error in case of cursor position retrieval. We need to retry until it succeeds.
// Previous versions of Mio (< 0.7) would automatically retry the poll call if it was interrupted (if EINTR was returned).
// https://docs.rs/mio/0.7.0/mio/struct.Poll.html#notes
if e.kind() == io::ErrorKind::Interrupted {
continue;
} else {
return Err(e);
}
};
if self.events.is_empty() {
// No readiness events = timeout
return Ok(None);
}
for token in self.events.iter().map(|x| x.token()) {
match token {
TTY_TOKEN => {
loop {
match self.tty_fd.read(&mut self.tty_buffer, TTY_BUFFER_SIZE) {
Ok(read_count) => {
if read_count > 0 {
self.parser.advance(
&self.tty_buffer[..read_count],
read_count == TTY_BUFFER_SIZE,
);
}
}
Err(e) => {
// No more data to read at the moment. We will receive another event
if e.kind() == io::ErrorKind::WouldBlock {
break;
}
// once more data is available to read.
else if e.kind() == io::ErrorKind::Interrupted {
continue;
}
}
};
if let Some(event) = self.parser.next() {
return Ok(Some(event));
}
}
}
SIGNAL_TOKEN => {
for signal in self.signals.pending() {
match signal {
signal_hook::consts::SIGWINCH => {
// TODO Should we remove tput?
//
// This can take a really long time, because terminal::size can
// launch new process (tput) and then it parses its output. It's
// not a really long time from the absolute time point of view, but
// it's a really long time from the mio, async-std/tokio executor, ...
// point of view.
let new_size = crate::terminal::size()?;
return Ok(Some(InternalEvent::Event(Event::Resize(
new_size.0, new_size.1,
))));
}
_ => unreachable!("Synchronize signal registration & handling"),
};
}
}
#[cfg(feature = "event-stream")]
WAKE_TOKEN => {
return Err(std::io::Error::new(
std::io::ErrorKind::Interrupted,
"Poll operation was woken up by `Waker::wake`",
));
}
_ => unreachable!("Synchronize Evented handle registration & token handling"),
}
}
// Processing above can take some time, check if timeout expired
if timeout.elapsed() {
return Ok(None);
}
}
}
#[cfg(feature = "event-stream")]
fn waker(&self) -> Waker {
self.waker.clone()
}
}
//
// Following `Parser` structure exists for two reasons:
//
// * mimic anes Parser interface
// * move the advancing, parsing, ... stuff out of the `try_read` method
//
#[derive(Debug)]
struct Parser {
buffer: Vec<u8>,
internal_events: VecDeque<InternalEvent>,
}
impl Default for Parser {
fn default() -> Self {
Parser {
// This buffer is used for -> 1 <- ANSI escape sequence. Are we
// aware of any ANSI escape sequence that is bigger? Can we make
// it smaller?
//
// Probably not worth spending more time on this as "there's a plan"
// to use the anes crate parser.
buffer: Vec::with_capacity(256),
// TTY_BUFFER_SIZE is 1_024 bytes. How many ANSI escape sequences can
// fit? What is an average sequence length? Let's guess here
// and say that the average ANSI escape sequence length is 8 bytes. Thus
// the buffer size should be 1024/8=128 to avoid additional allocations
// when processing large amounts of data.
//
// There's no need to make it bigger, because when you look at the `try_read`
// method implementation, all events are consumed before the next TTY_BUFFER
// is processed -> events pushed.
internal_events: VecDeque::with_capacity(128),
}
}
}
impl Parser {
fn advance(&mut self, buffer: &[u8], more: bool) {
for (idx, byte) in buffer.iter().enumerate() {
let more = idx + 1 < buffer.len() || more;
self.buffer.push(*byte);
match parse_event(&self.buffer, more) {
Ok(Some(ie)) => {
self.internal_events.push_back(ie);
self.buffer.clear();
}
Ok(None) => {
// Event can't be parsed, because we don't have enough bytes for
// the current sequence. Keep the buffer and process next bytes.
}
Err(_) => {
// Event can't be parsed (not enough parameters, parameter is not a number, ...).
// Clear the buffer and continue with another sequence.
self.buffer.clear();
}
}
}
}
}
impl Iterator for Parser {
type Item = InternalEvent;
fn next(&mut self) -> Option<Self::Item> {
self.internal_events.pop_front()
}
}
#[cfg(not(feature = "use-dev-tty"))]
pub(crate) use self::mio::UnixInternalEventSource;

241
src/event/source/unix/mio.rs Normal file
View File

@ -0,0 +1,241 @@
use std::{collections::VecDeque, io, time::Duration};
use mio::{unix::SourceFd, Events, Interest, Poll, Token};
use signal_hook_mio::v0_8::Signals;
use crate::Result;
#[cfg(feature = "event-stream")]
use crate::event::sys::Waker;
use crate::event::{
source::EventSource,
sys::unix::{
file_descriptor::{tty_fd, FileDesc},
parse::parse_event,
},
timeout::PollTimeout,
Event, InternalEvent,
};
// Tokens to identify file descriptor
const TTY_TOKEN: Token = Token(0);
const SIGNAL_TOKEN: Token = Token(1);
#[cfg(feature = "event-stream")]
const WAKE_TOKEN: Token = Token(2);
// I (@zrzka) wasn't able to read more than 1_022 bytes when testing
// reading on macOS/Linux -> we don't need bigger buffer and 1k of bytes
// is enough.
const TTY_BUFFER_SIZE: usize = 1_024;
pub(crate) struct UnixInternalEventSource {
poll: Poll,
events: Events,
parser: Parser,
tty_buffer: [u8; TTY_BUFFER_SIZE],
tty_fd: FileDesc,
signals: Signals,
#[cfg(feature = "event-stream")]
waker: Waker,
}
impl UnixInternalEventSource {
pub fn new() -> Result<Self> {
UnixInternalEventSource::from_file_descriptor(tty_fd()?)
}
pub(crate) fn from_file_descriptor(input_fd: FileDesc) -> Result<Self> {
let poll = Poll::new()?;
let registry = poll.registry();
let tty_raw_fd = input_fd.raw_fd();
let mut tty_ev = SourceFd(&tty_raw_fd);
registry.register(&mut tty_ev, TTY_TOKEN, Interest::READABLE)?;
let mut signals = Signals::new([signal_hook::consts::SIGWINCH])?;
registry.register(&mut signals, SIGNAL_TOKEN, Interest::READABLE)?;
#[cfg(feature = "event-stream")]
let waker = Waker::new(registry, WAKE_TOKEN)?;
Ok(UnixInternalEventSource {
poll,
events: Events::with_capacity(3),
parser: Parser::default(),
tty_buffer: [0u8; TTY_BUFFER_SIZE],
tty_fd: input_fd,
signals,
#[cfg(feature = "event-stream")]
waker,
})
}
}
impl EventSource for UnixInternalEventSource {
fn try_read(&mut self, timeout: Option<Duration>) -> Result<Option<InternalEvent>> {
if let Some(event) = self.parser.next() {
return Ok(Some(event));
}
let timeout = PollTimeout::new(timeout);
loop {
if let Err(e) = self.poll.poll(&mut self.events, timeout.leftover()) {
// Mio will throw an interrupted error in case of cursor position retrieval. We need to retry until it succeeds.
// Previous versions of Mio (< 0.7) would automatically retry the poll call if it was interrupted (if EINTR was returned).
// https://docs.rs/mio/0.7.0/mio/struct.Poll.html#notes
if e.kind() == io::ErrorKind::Interrupted {
continue;
} else {
return Err(e);
}
};
if self.events.is_empty() {
// No readiness events = timeout
return Ok(None);
}
for token in self.events.iter().map(|x| x.token()) {
match token {
TTY_TOKEN => {
loop {
match self.tty_fd.read(&mut self.tty_buffer, TTY_BUFFER_SIZE) {
Ok(read_count) => {
if read_count > 0 {
self.parser.advance(
&self.tty_buffer[..read_count],
read_count == TTY_BUFFER_SIZE,
);
}
}
Err(e) => {
// No more data to read at the moment. We will receive another event
if e.kind() == io::ErrorKind::WouldBlock {
break;
}
// once more data is available to read.
else if e.kind() == io::ErrorKind::Interrupted {
continue;
}
}
};
if let Some(event) = self.parser.next() {
return Ok(Some(event));
}
}
}
SIGNAL_TOKEN => {
for signal in self.signals.pending() {
match signal {
signal_hook::consts::SIGWINCH => {
// TODO Should we remove tput?
//
// This can take a really long time, because terminal::size can
// launch new process (tput) and then it parses its output. It's
// not a really long time from the absolute time point of view, but
// it's a really long time from the mio, async-std/tokio executor, ...
// point of view.
let new_size = crate::terminal::size()?;
return Ok(Some(InternalEvent::Event(Event::Resize(
new_size.0, new_size.1,
))));
}
_ => unreachable!("Synchronize signal registration & handling"),
};
}
}
#[cfg(feature = "event-stream")]
WAKE_TOKEN => {
return Err(std::io::Error::new(
std::io::ErrorKind::Interrupted,
"Poll operation was woken up by `Waker::wake`",
));
}
_ => unreachable!("Synchronize Evented handle registration & token handling"),
}
}
// Processing above can take some time, check if timeout expired
if timeout.elapsed() {
return Ok(None);
}
}
}
#[cfg(feature = "event-stream")]
fn waker(&self) -> Waker {
self.waker.clone()
}
}
//
// Following `Parser` structure exists for two reasons:
//
// * mimic anes Parser interface
// * move the advancing, parsing, ... stuff out of the `try_read` method
//
#[derive(Debug)]
struct Parser {
buffer: Vec<u8>,
internal_events: VecDeque<InternalEvent>,
}
impl Default for Parser {
fn default() -> Self {
Parser {
// This buffer is used for -> 1 <- ANSI escape sequence. Are we
// aware of any ANSI escape sequence that is bigger? Can we make
// it smaller?
//
// Probably not worth spending more time on this as "there's a plan"
// to use the anes crate parser.
buffer: Vec::with_capacity(256),
// TTY_BUFFER_SIZE is 1_024 bytes. How many ANSI escape sequences can
// fit? What is an average sequence length? Let's guess here
// and say that the average ANSI escape sequence length is 8 bytes. Thus
// the buffer size should be 1024/8=128 to avoid additional allocations
// when processing large amounts of data.
//
// There's no need to make it bigger, because when you look at the `try_read`
// method implementation, all events are consumed before the next TTY_BUFFER
// is processed -> events pushed.
internal_events: VecDeque::with_capacity(128),
}
}
}
impl Parser {
fn advance(&mut self, buffer: &[u8], more: bool) {
for (idx, byte) in buffer.iter().enumerate() {
let more = idx + 1 < buffer.len() || more;
self.buffer.push(*byte);
match parse_event(&self.buffer, more) {
Ok(Some(ie)) => {
self.internal_events.push_back(ie);
self.buffer.clear();
}
Ok(None) => {
// Event can't be parsed, because we don't have enough bytes for
// the current sequence. Keep the buffer and process next bytes.
}
Err(_) => {
// Event can't be parsed (not enough parameters, parameter is not a number, ...).
// Clear the buffer and continue with another sequence.
self.buffer.clear();
}
}
}
}
}
impl Iterator for Parser {
type Item = InternalEvent;
fn next(&mut self) -> Option<Self::Item> {
self.internal_events.pop_front()
}
}

264
src/event/source/unix/tty.rs Normal file
View File

@ -0,0 +1,264 @@
use std::os::unix::prelude::AsRawFd;
use std::{collections::VecDeque, io, os::unix::net::UnixStream, time::Duration};
use signal_hook::low_level::pipe;
use crate::event::timeout::PollTimeout;
use crate::event::Event;
use crate::Result;
use filedescriptor::{poll, pollfd, POLLIN};
#[cfg(feature = "event-stream")]
use crate::event::sys::Waker;
use crate::{
event::{
sys::unix::{
file_descriptor::{tty_fd, FileDesc},
parse::parse_event,
},
InternalEvent,
source::EventSource,
},
};
/// Holds a prototypical Waker and a receiver we can wait on when doing select().
#[cfg(feature = "event-stream")]
struct WakePipe {
receiver: UnixStream,
waker: Waker,
}
#[cfg(feature = "event-stream")]
impl WakePipe {
fn new() -> Result<Self> {
let (receiver, sender) = nonblocking_unix_pair()?;
Ok(WakePipe {
receiver,
waker: Waker::new(sender),
})
}
}
// I (@zrzka) wasn't able to read more than 1_022 bytes when testing
// reading on macOS/Linux -> we don't need bigger buffer and 1k of bytes
// is enough.
const TTY_BUFFER_SIZE: usize = 1_024;
pub(crate) struct UnixInternalEventSource {
parser: Parser,
tty_buffer: [u8; TTY_BUFFER_SIZE],
tty: FileDesc,
winch_signal_receiver: UnixStream,
#[cfg(feature = "event-stream")]
wake_pipe: WakePipe,
}
fn nonblocking_unix_pair() -> Result<(UnixStream, UnixStream)> {
let (receiver, sender) = UnixStream::pair()?;
receiver.set_nonblocking(true)?;
sender.set_nonblocking(true)?;
Ok((receiver, sender))
}
impl UnixInternalEventSource {
pub fn new() -> Result<Self> {
UnixInternalEventSource::from_file_descriptor(tty_fd()?)
}
pub(crate) fn from_file_descriptor(input_fd: FileDesc) -> Result<Self> {
Ok(UnixInternalEventSource {
parser: Parser::default(),
tty_buffer: [0u8; TTY_BUFFER_SIZE],
tty: input_fd,
winch_signal_receiver: {
let (receiver, sender) = nonblocking_unix_pair()?;
// Unregistering is unnecessary because EventSource is a singleton
pipe::register(libc::SIGWINCH, sender)?;
receiver
},
#[cfg(feature = "event-stream")]
wake_pipe: WakePipe::new()?,
})
}
}
/// read_complete reads from a non-blocking file descriptor
/// until the buffer is full or it would block.
///
/// Similar to `std::io::Read::read_to_end`, except this function
/// only fills the given buffer and does not read beyond that.
fn read_complete(fd: &FileDesc, buf: &mut [u8]) -> Result<usize> {
loop {
match fd.read(buf, buf.len()) {
Ok(x) => return Ok(x),
Err(e) => match e.kind() {
io::ErrorKind::WouldBlock => return Ok(0),
io::ErrorKind::Interrupted => continue,
_ => return Err(e),
},
}
}
}
impl EventSource for UnixInternalEventSource {
fn try_read(&mut self, timeout: Option<Duration>) -> Result<Option<InternalEvent>> {
let timeout = PollTimeout::new(timeout);
fn make_pollfd<F: AsRawFd>(fd: &F) -> pollfd {
pollfd {
fd: fd.as_raw_fd(),
events: POLLIN,
revents: 0,
}
}
#[cfg(not(feature = "event-stream"))]
let mut fds = [
make_pollfd(&self.tty),
make_pollfd(&self.winch_signal_receiver),
];
#[cfg(feature = "event-stream")]
let mut fds = [
make_pollfd(&self.tty),
make_pollfd(&self.winch_signal_receiver),
make_pollfd(&self.wake_pipe.receiver),
];
while timeout.leftover().map_or(true, |t| !t.is_zero()) {
// check if there are buffered events from the last read
if let Some(event) = self.parser.next() {
return Ok(Some(event));
}
match poll(&mut fds, timeout.leftover()) {
Err(filedescriptor::Error::Io(e)) => return Err(e),
res => res.expect("polling tty"),
};
if fds[0].revents & POLLIN != 0 {
loop {
let read_count = read_complete(&self.tty, &mut self.tty_buffer)?;
if read_count > 0 {
self.parser.advance(
&self.tty_buffer[..read_count],
read_count == TTY_BUFFER_SIZE,
);
}
if let Some(event) = self.parser.next() {
return Ok(Some(event));
}
if read_count == 0 {
break;
}
}
}
if fds[1].revents & POLLIN != 0 {
let fd = FileDesc::new(self.winch_signal_receiver.as_raw_fd(), false);
// drain the pipe
while read_complete(&fd, &mut [0; 1024])? != 0 {}
// TODO Should we remove tput?
//
// This can take a really long time, because terminal::size can
// launch new process (tput) and then it parses its output. It's
// not a really long time from the absolute time point of view, but
// it's a really long time from the mio, async-std/tokio executor, ...
// point of view.
let new_size = crate::terminal::size()?;
return Ok(Some(InternalEvent::Event(Event::Resize(
new_size.0, new_size.1,
))));
}
#[cfg(feature = "event-stream")]
if fds[2].revents & POLLIN != 0 {
let fd = FileDesc::new(self.wake_pipe.receiver.as_raw_fd(), false);
// drain the pipe
while read_complete(&fd, &mut [0; 1024])? != 0 {}
return Err(std::io::Error::new(
std::io::ErrorKind::Interrupted,
"Poll operation was woken up by `Waker::wake`",
));
}
}
Ok(None)
}
#[cfg(feature = "event-stream")]
fn waker(&self) -> Waker {
self.wake_pipe.waker.clone()
}
}
//
// Following `Parser` structure exists for two reasons:
//
// * mimic anes Parser interface
// * move the advancing, parsing, ... stuff out of the `try_read` method
//
#[derive(Debug)]
struct Parser {
buffer: Vec<u8>,
internal_events: VecDeque<InternalEvent>,
}
impl Default for Parser {
fn default() -> Self {
Parser {
// This buffer is used for -> 1 <- ANSI escape sequence. Are we
// aware of any ANSI escape sequence that is bigger? Can we make
// it smaller?
//
// Probably not worth spending more time on this as "there's a plan"
// to use the anes crate parser.
buffer: Vec::with_capacity(256),
// TTY_BUFFER_SIZE is 1_024 bytes. How many ANSI escape sequences can
// fit? What is an average sequence length? Let's guess here
// and say that the average ANSI escape sequence length is 8 bytes. Thus
// the buffer size should be 1024/8=128 to avoid additional allocations
// when processing large amounts of data.
//
// There's no need to make it bigger, because when you look at the `try_read`
// method implementation, all events are consumed before the next TTY_BUFFER
// is processed -> events pushed.
internal_events: VecDeque::with_capacity(128),
}
}
}
impl Parser {
fn advance(&mut self, buffer: &[u8], more: bool) {
for (idx, byte) in buffer.iter().enumerate() {
let more = idx + 1 < buffer.len() || more;
self.buffer.push(*byte);
match parse_event(&self.buffer, more) {
Ok(Some(ie)) => {
self.internal_events.push_back(ie);
self.buffer.clear();
}
Ok(None) => {
// Event can't be parsed, because we don't have enough bytes for
// the current sequence. Keep the buffer and process next bytes.
}
Err(_) => {
// Event can't be parsed (not enough parameters, parameter is not a number, ...).
// Clear the buffer and continue with another sequence.
self.buffer.clear();
}
}
}
}
}
impl Iterator for Parser {
type Item = InternalEvent;
fn next(&mut self) -> Option<Self::Item> {
self.internal_events.pop_front()
}
}

13
src/event/sys/unix/file_descriptor.rs
View File

@ -1,6 +1,9 @@
use std::{
fs, io,
os::unix::io::{IntoRawFd, RawFd},
os::unix::{
io::{IntoRawFd, RawFd},
prelude::AsRawFd,
},
};
use libc::size_t;
@ -34,7 +37,7 @@ impl FileDesc {
self.fd,
buffer.as_mut_ptr() as *mut libc::c_void,
size as size_t,
) as isize
)
};
if result < 0 {
@ -63,6 +66,12 @@ impl Drop for FileDesc {
}
}
impl AsRawFd for FileDesc {
fn as_raw_fd(&self) -> RawFd {
self.raw_fd()
}
}
/// Creates a file descriptor pointing to the standard input or `/dev/tty`.
pub fn tty_fd() -> Result<FileDesc> {
let (fd, close_on_drop) = if unsafe { libc::isatty(libc::STDIN_FILENO) == 1 } {

4
src/event/sys/unix/parse.rs
View File

@ -105,11 +105,11 @@ pub(crate) fn parse_event(buffer: &[u8], input_available: bool) -> Result<Option
KeyCode::Backspace.into(),
)))),
c @ b'\x01'..=b'\x1A' => Ok(Some(InternalEvent::Event(Event::Key(KeyEvent::new(
KeyCode::Char((c as u8 - 0x1 + b'a') as char),
KeyCode::Char((c - 0x1 + b'a') as char),
KeyModifiers::CONTROL,
))))),
c @ b'\x1C'..=b'\x1F' => Ok(Some(InternalEvent::Event(Event::Key(KeyEvent::new(
KeyCode::Char((c as u8 - 0x1C + b'4') as char),
KeyCode::Char((c - 0x1C + b'4') as char),
KeyModifiers::CONTROL,
))))),
b'\0' => Ok(Some(InternalEvent::Event(Event::Key(KeyEvent::new(

41
src/event/sys/unix/waker.rs
View File

@ -1,36 +1,11 @@
use std::sync::{Arc, Mutex};
#[cfg(feature = "use-dev-tty")]
pub(crate) mod tty;
use mio::{Registry, Token};
#[cfg(not(feature = "use-dev-tty"))]
pub(crate) mod mio;
use crate::Result;
#[cfg(feature = "use-dev-tty")]
pub(crate) use self::tty::Waker;
/// Allows to wake up the `mio::Poll::poll()` method.
/// This type wraps `mio::Waker`, for more information see its documentation.
#[derive(Clone, Debug)]
pub(crate) struct Waker {
inner: Arc<Mutex<mio::Waker>>,
}
impl Waker {
/// Create a new `Waker`.
pub(crate) fn new(registry: &Registry, waker_token: Token) -> Result<Self> {
Ok(Self {
inner: Arc::new(Mutex::new(mio::Waker::new(registry, waker_token)?)),
})
}
/// Wake up the [`Poll`] associated with this `Waker`.
///
/// Readiness is set to `Ready::readable()`.
pub(crate) fn wake(&self) -> Result<()> {
self.inner.lock().unwrap().wake()
}
/// Resets the state so the same waker can be reused.
///
/// This function is not impl
#[allow(dead_code, clippy::clippy::unnecessary_wraps)]
pub(crate) fn reset(&self) -> Result<()> {
Ok(())
}
}
#[cfg(not(feature = "use-dev-tty"))]
pub(crate) use self::mio::Waker;

36
src/event/sys/unix/waker/mio.rs Normal file
View File

@ -0,0 +1,36 @@
use std::sync::{Arc, Mutex};
use mio::{Registry, Token};
use crate::Result;
/// Allows to wake up the `mio::Poll::poll()` method.
/// This type wraps `mio::Waker`, for more information see its documentation.
#[derive(Clone, Debug)]
pub(crate) struct Waker {
inner: Arc<Mutex<mio::Waker>>,
}
impl Waker {
/// Create a new `Waker`.
pub(crate) fn new(registry: &Registry, waker_token: Token) -> Result<Self> {
Ok(Self {
inner: Arc::new(Mutex::new(mio::Waker::new(registry, waker_token)?)),
})
}
/// Wake up the [`Poll`] associated with this `Waker`.
///
/// Readiness is set to `Ready::readable()`.
pub(crate) fn wake(&self) -> Result<()> {
self.inner.lock().unwrap().wake()
}
/// Resets the state so the same waker can be reused.
///
/// This function is not impl
#[allow(dead_code, clippy::clippy::unnecessary_wraps)]
pub(crate) fn reset(&self) -> Result<()> {
Ok(())
}
}

38
src/event/sys/unix/waker/tty.rs Normal file
View File

@ -0,0 +1,38 @@
use std::{
io::Write,
os::unix::net::UnixStream,
sync::{Arc, Mutex},
};
use crate::Result;
/// Allows to wake up the EventSource::try_read() method.
#[derive(Clone, Debug)]
pub(crate) struct Waker {
inner: Arc<Mutex<UnixStream>>,
}
impl Waker {
/// Create a new `Waker`.
pub(crate) fn new(writer: UnixStream) -> Self {
Self {
inner: Arc::new(Mutex::new(writer)),
}
}
/// Wake up the [`Poll`] associated with this `Waker`.
///
/// Readiness is set to `Ready::readable()`.
pub(crate) fn wake(&self) -> Result<()> {
self.inner.lock().unwrap().write(&[0])?;
Ok(())
}
/// Resets the state so the same waker can be reused.
///
/// This function is not impl
#[allow(dead_code, clippy::clippy::unnecessary_wraps)]
pub(crate) fn reset(&self) -> Result<()> {
Ok(())
}
}