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|
//! Tests for level triggered and edge triggered mode.
#![allow(clippy::unused_io_amount)]
use std::io::{self, prelude::*};
use std::net::{TcpListener, TcpStream};
use std::time::Duration;
use polling::{Event, Events, PollMode, Poller};
#[test]
fn level_triggered() {
// Create our streams.
let (mut reader, mut writer) = tcp_pair().unwrap();
let reader_token = 1;
// Create our poller and register our streams.
let poller = Poller::new().unwrap();
if unsafe { poller.add_with_mode(&reader, Event::readable(reader_token), PollMode::Level) }
.is_err()
{
// Only panic if we're on a platform that should support level mode.
cfg_if::cfg_if! {
if #[cfg(any(target_os = "solaris", target_os = "illumos"))] {
return;
} else {
panic!("Level mode should be supported on this platform");
}
}
}
// Write some data to the writer.
let data = [1, 2, 3, 4, 5];
writer.write_all(&data).unwrap();
// A "readable" notification should be delivered.
let mut events = Events::new();
poller
.wait(&mut events, Some(Duration::from_secs(10)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(
events.iter().next().unwrap().with_no_extra(),
Event::readable(reader_token)
);
// If we read some of the data, the notification should still be available.
reader.read_exact(&mut [0; 3]).unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_secs(10)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(
events.iter().next().unwrap().with_no_extra(),
Event::readable(reader_token)
);
// If we read the rest of the data, the notification should be gone.
reader.read_exact(&mut [0; 2]).unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_secs(0)))
.unwrap();
assert!(events.is_empty());
// After modifying the stream and sending more data, it should be oneshot.
poller
.modify_with_mode(&reader, Event::readable(reader_token), PollMode::Oneshot)
.unwrap();
writer.write(&data).unwrap();
events.clear();
// BUG: Somehow, the notification here is delayed?
poller
.wait(&mut events, Some(Duration::from_secs(10)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(
events.iter().next().unwrap().with_no_extra(),
Event::readable(reader_token)
);
// After reading, the notification should vanish.
reader.read(&mut [0; 5]).unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_secs(0)))
.unwrap();
assert!(events.is_empty());
}
#[test]
fn edge_triggered() {
// Create our streams.
let (mut reader, mut writer) = tcp_pair().unwrap();
let reader_token = 1;
// Create our poller and register our streams.
let poller = Poller::new().unwrap();
if unsafe { poller.add_with_mode(&reader, Event::readable(reader_token), PollMode::Edge) }
.is_err()
{
// Only panic if we're on a platform that should support level mode.
cfg_if::cfg_if! {
if #[cfg(all(
any(
target_os = "linux",
target_os = "android",
target_vendor = "apple",
target_os = "freebsd",
target_os = "netbsd",
target_os = "openbsd",
target_os = "dragonfly"
),
not(polling_test_poll_backend)
))] {
panic!("Edge mode should be supported on this platform");
} else {
return;
}
}
}
// Write some data to the writer.
let data = [1, 2, 3, 4, 5];
writer.write_all(&data).unwrap();
// A "readable" notification should be delivered.
let mut events = Events::new();
poller
.wait(&mut events, Some(Duration::from_secs(10)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(
events.iter().next().unwrap().with_no_extra(),
Event::readable(reader_token)
);
// If we read some of the data, the notification should not still be available.
reader.read_exact(&mut [0; 3]).unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_secs(0)))
.unwrap();
assert!(events.is_empty());
// If we write more data, a notification should be delivered.
writer.write_all(&data).unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_secs(10)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(
events.iter().next().unwrap().with_no_extra(),
Event::readable(reader_token)
);
// After modifying the stream and sending more data, it should be oneshot.
poller
.modify_with_mode(&reader, Event::readable(reader_token), PollMode::Oneshot)
.unwrap();
writer.write_all(&data).unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_secs(10)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(
events.iter().next().unwrap().with_no_extra(),
Event::readable(reader_token)
);
}
#[test]
fn edge_oneshot_triggered() {
// Create our streams.
let (mut reader, mut writer) = tcp_pair().unwrap();
let reader_token = 1;
// Create our poller and register our streams.
let poller = Poller::new().unwrap();
if unsafe {
poller.add_with_mode(
&reader,
Event::readable(reader_token),
PollMode::EdgeOneshot,
)
}
.is_err()
{
// Only panic if we're on a platform that should support level mode.
cfg_if::cfg_if! {
if #[cfg(all(
any(
target_os = "linux",
target_os = "android",
target_vendor = "apple",
target_os = "freebsd",
target_os = "netbsd",
target_os = "openbsd",
target_os = "dragonfly"
),
not(polling_test_poll_backend)
))] {
panic!("Edge mode should be supported on this platform");
} else {
return;
}
}
}
// Write some data to the writer.
let data = [1, 2, 3, 4, 5];
writer.write_all(&data).unwrap();
// A "readable" notification should be delivered.
let mut events = Events::new();
poller
.wait(&mut events, Some(Duration::from_secs(10)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(
events.iter().next().unwrap().with_no_extra(),
Event::readable(reader_token)
);
// If we read some of the data, the notification should not still be available.
reader.read_exact(&mut [0; 3]).unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_secs(0)))
.unwrap();
assert!(events.is_empty());
// If we modify to re-enable the notification, it should be delivered.
poller
.modify_with_mode(
&reader,
Event::readable(reader_token),
PollMode::EdgeOneshot,
)
.unwrap();
events.clear();
poller
.wait(&mut events, Some(Duration::from_secs(0)))
.unwrap();
assert_eq!(events.len(), 1);
assert_eq!(
events.iter().next().unwrap().with_no_extra(),
Event::readable(reader_token)
);
}
fn tcp_pair() -> io::Result<(TcpStream, TcpStream)> {
let listener = TcpListener::bind("127.0.0.1:0")?;
let a = TcpStream::connect(listener.local_addr()?)?;
let (b, _) = listener.accept()?;
Ok((a, b))
}
|
