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#![feature(test)]
#[cfg(feature = "bilock")]
mod bench {
use futures::executor::LocalPool;
use futures::task::{Context, Waker};
use futures_util::lock::BiLock;
use futures_util::lock::BiLockAcquire;
use futures_util::lock::BiLockAcquired;
use futures_util::task::ArcWake;
use std::sync::Arc;
use test::Bencher;
fn notify_noop() -> Waker {
struct Noop;
impl ArcWake for Noop {
fn wake(_: &Arc<Self>) {}
}
ArcWake::into_waker(Arc::new(Noop))
}
/// Pseudo-stream which simply calls `lock.poll()` on `poll`
struct LockStream {
lock: BiLockAcquire<u32>,
}
impl LockStream {
fn new(lock: BiLock<u32>) -> Self {
Self { 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_next(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>, Self::Error> {
self.lock.poll(cx).map(|a| a.map(Some))
}
}
#[bench]
fn contended(b: &mut Bencher) {
let pool = LocalPool::new();
let mut exec = pool.executor();
let waker = notify_noop();
let mut map = task::LocalMap::new();
let mut waker = task::Context::new(&mut map, &waker, &mut exec);
b.iter(|| {
let (x, y) = BiLock::new(1);
let mut x = LockStream::new(x);
let mut y = LockStream::new(y);
for _ in 0..1000 {
let x_guard = match x.poll_next(&mut waker) {
Ok(Poll::Ready(Some(guard))) => guard,
_ => panic!(),
};
// Try poll second lock while first lock still holds the lock
match y.poll_next(&mut waker) {
Ok(Poll::Pending) => (),
_ => panic!(),
};
x.release_lock(x_guard);
let y_guard = match y.poll_next(&mut waker) {
Ok(Poll::Ready(Some(guard))) => guard,
_ => panic!(),
};
y.release_lock(y_guard);
}
(x, y)
});
}
#[bench]
fn lock_unlock(b: &mut Bencher) {
let pool = LocalPool::new();
let mut exec = pool.executor();
let waker = notify_noop();
let mut map = task::LocalMap::new();
let mut waker = task::Context::new(&mut map, &waker, &mut exec);
b.iter(|| {
let (x, y) = BiLock::new(1);
let mut x = LockStream::new(x);
let mut y = LockStream::new(y);
for _ in 0..1000 {
let x_guard = match x.poll_next(&mut waker) {
Ok(Poll::Ready(Some(guard))) => guard,
_ => panic!(),
};
x.release_lock(x_guard);
let y_guard = match y.poll_next(&mut waker) {
Ok(Poll::Ready(Some(guard))) => guard,
_ => panic!(),
};
y.release_lock(y_guard);
}
(x, y)
})
}
}
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