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#![feature(test)]
extern crate futures;
extern crate test;
use futures::{Async, Poll};
use futures::executor;
use futures::executor::{Notify, NotifyHandle};
use futures::sync::BiLock;
use futures::sync::BiLockAcquire;
use futures::sync::BiLockAcquired;
use futures::future::Future;
use futures::stream::Stream;
use test::Bencher;
fn notify_noop() -> NotifyHandle {
struct Noop;
impl Notify for Noop {
fn notify(&self, _id: usize) {}
}
const NOOP : &'static Noop = &Noop;
NotifyHandle::from(NOOP)
}
/// Pseudo-stream which simply calls `lock.poll()` on `poll`
struct LockStream {
lock: BiLockAcquire<u32>,
}
impl LockStream {
fn new(lock: BiLock<u32>) -> LockStream {
LockStream {
lock: lock.lock()
}
}
/// Release a lock after it was acquired in `poll`,
/// so `poll` could be called again.
fn release_lock(&mut self, guard: BiLockAcquired<u32>) {
self.lock = guard.unlock().lock()
}
}
impl Stream for LockStream {
type Item = BiLockAcquired<u32>;
type Error = ();
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
self.lock.poll().map(|a| match a {
Async::Ready(a) => Async::Ready(Some(a)),
Async::NotReady => Async::NotReady,
})
}
}
#[bench]
fn contended(b: &mut Bencher) {
b.iter(|| {
let (x, y) = BiLock::new(1);
let mut x = executor::spawn(LockStream::new(x));
let mut y = executor::spawn(LockStream::new(y));
for _ in 0..1000 {
let x_guard = match x.poll_stream_notify(¬ify_noop(), 11) {
Ok(Async::Ready(Some(guard))) => guard,
_ => panic!(),
};
// Try poll second lock while first lock still holds the lock
match y.poll_stream_notify(¬ify_noop(), 11) {
Ok(Async::NotReady) => (),
_ => panic!(),
};
x.get_mut().release_lock(x_guard);
let y_guard = match y.poll_stream_notify(¬ify_noop(), 11) {
Ok(Async::Ready(Some(guard))) => guard,
_ => panic!(),
};
y.get_mut().release_lock(y_guard);
}
(x, y)
});
}
#[bench]
fn lock_unlock(b: &mut Bencher) {
b.iter(|| {
let (x, y) = BiLock::new(1);
let mut x = executor::spawn(LockStream::new(x));
let mut y = executor::spawn(LockStream::new(y));
for _ in 0..1000 {
let x_guard = match x.poll_stream_notify(¬ify_noop(), 11) {
Ok(Async::Ready(Some(guard))) => guard,
_ => panic!(),
};
x.get_mut().release_lock(x_guard);
let y_guard = match y.poll_stream_notify(¬ify_noop(), 11) {
Ok(Async::Ready(Some(guard))) => guard,
_ => panic!(),
};
y.get_mut().release_lock(y_guard);
}
(x, y)
})
}
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