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list.rs
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list.rs
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//! Tests for the list channel flavor.
extern crate crossbeam;
#[macro_use]
extern crate crossbeam_channel as channel;
extern crate rand;
mod wrappers;
macro_rules! tests {
($channel:path) => {
use std::sync::atomic::AtomicUsize;
use std::sync::atomic::Ordering;
use std::thread;
use std::time::Duration;
use $channel as channel;
use crossbeam;
use rand::{thread_rng, Rng};
fn ms(ms: u64) -> Duration {
Duration::from_millis(ms)
}
#[test]
fn smoke() {
let (s, r) = channel::unbounded();
s.send(7);
assert_eq!(r.try_recv(), Some(7));
s.send(8);
assert_eq!(r.recv(), Some(8));
assert_eq!(r.try_recv(), None);
select! {
recv(r) => panic!(),
recv(channel::after(ms(1000))) => {}
}
assert_eq!(s.capacity(), None);
assert_eq!(r.capacity(), None);
}
#[test]
fn capacity() {
let (s, r) = channel::unbounded::<()>();
assert_eq!(s.capacity(), None);
assert_eq!(r.capacity(), None);
}
#[test]
fn len_empty_full() {
let (s, r) = channel::unbounded();
assert_eq!(s.len(), 0);
assert_eq!(s.is_empty(), true);
assert_eq!(s.is_full(), false);
assert_eq!(r.len(), 0);
assert_eq!(r.is_empty(), true);
assert_eq!(r.is_full(), false);
s.send(());
assert_eq!(s.len(), 1);
assert_eq!(s.is_empty(), false);
assert_eq!(s.is_full(), false);
assert_eq!(r.len(), 1);
assert_eq!(r.is_empty(), false);
assert_eq!(r.is_full(), false);
r.recv().unwrap();
assert_eq!(s.len(), 0);
assert_eq!(s.is_empty(), true);
assert_eq!(s.is_full(), false);
assert_eq!(r.len(), 0);
assert_eq!(r.is_empty(), true);
assert_eq!(r.is_full(), false);
}
#[test]
fn recv() {
let (s, r) = channel::unbounded();
crossbeam::scope(|scope| {
scope.spawn(move || {
assert_eq!(r.recv(), Some(7));
thread::sleep(ms(1000));
assert_eq!(r.recv(), Some(8));
thread::sleep(ms(1000));
assert_eq!(r.recv(), Some(9));
assert_eq!(r.recv(), None);
});
scope.spawn(move || {
thread::sleep(ms(1500));
s.send(7);
s.send(8);
s.send(9);
});
});
}
#[test]
fn recv_timeout() {
let (s, r) = channel::unbounded::<i32>();
crossbeam::scope(|scope| {
scope.spawn(move || {
select! {
recv(r) => panic!(),
recv(channel::after(ms(1000))) => {}
}
select! {
recv(r, v) => assert_eq!(v, Some(7)),
recv(channel::after(ms(1000))) => panic!(),
}
select! {
recv(r, v) => assert_eq!(v, None),
recv(channel::after(ms(1000))) => panic!(),
}
});
scope.spawn(move || {
thread::sleep(ms(1500));
s.send(7);
});
});
}
#[test]
fn try_recv() {
let (s, r) = channel::unbounded();
crossbeam::scope(|scope| {
scope.spawn(move || {
assert_eq!(r.try_recv(), None);
thread::sleep(ms(1500));
assert_eq!(r.try_recv(), Some(7));
thread::sleep(ms(500));
assert_eq!(r.try_recv(), None);
});
scope.spawn(move || {
thread::sleep(ms(1000));
s.send(7);
});
});
}
#[test]
fn recv_after_close() {
let (s, r) = channel::unbounded();
s.send(1);
s.send(2);
s.send(3);
drop(s);
assert_eq!(r.recv(), Some(1));
assert_eq!(r.recv(), Some(2));
assert_eq!(r.recv(), Some(3));
assert_eq!(r.recv(), None);
}
#[test]
fn len() {
let (s, r) = channel::unbounded();
assert_eq!(s.len(), 0);
assert_eq!(r.len(), 0);
for i in 0..50 {
s.send(i);
assert_eq!(s.len(), i + 1);
}
for i in 0..50 {
r.recv().unwrap();
assert_eq!(r.len(), 50 - i - 1);
}
assert_eq!(s.len(), 0);
assert_eq!(r.len(), 0);
}
#[test]
fn close_wakes_receiver() {
let (s, r) = channel::unbounded::<()>();
crossbeam::scope(|scope| {
scope.spawn(move || {
assert_eq!(r.recv(), None);
});
scope.spawn(move || {
thread::sleep(ms(1000));
drop(s);
});
});
}
#[test]
fn spsc() {
const COUNT: usize = 100_000;
let (s, r) = channel::unbounded();
crossbeam::scope(|scope| {
scope.spawn(move || {
for i in 0..COUNT {
assert_eq!(r.recv(), Some(i));
}
assert_eq!(r.recv(), None);
});
scope.spawn(move || {
for i in 0..COUNT {
s.send(i);
}
});
});
}
#[test]
fn mpmc() {
const COUNT: usize = 25_000;
const THREADS: usize = 4;
let (s, r) = channel::unbounded::<usize>();
let v = (0..COUNT).map(|_| AtomicUsize::new(0)).collect::<Vec<_>>();
crossbeam::scope(|scope| {
for _ in 0..THREADS {
scope.spawn(|| {
for _ in 0..COUNT {
let n = r.recv().unwrap();
v[n].fetch_add(1, Ordering::SeqCst);
}
});
}
for _ in 0..THREADS {
scope.spawn(|| {
for i in 0..COUNT {
s.send(i);
}
});
}
});
assert_eq!(r.try_recv(), None);
for c in v {
assert_eq!(c.load(Ordering::SeqCst), THREADS);
}
}
#[test]
fn stress_timeout_two_threads() {
const COUNT: usize = 100;
let (s, r) = channel::unbounded();
crossbeam::scope(|scope| {
scope.spawn(|| {
for i in 0..COUNT {
if i % 2 == 0 {
thread::sleep(ms(50));
}
s.send(i);
}
});
scope.spawn(|| {
for i in 0..COUNT {
if i % 2 == 0 {
thread::sleep(ms(50));
}
loop {
select! {
recv(r, v) => {
assert_eq!(v, Some(i));
break;
}
recv(channel::after(ms(10))) => {}
}
}
}
});
});
}
#[test]
fn drops() {
static DROPS: AtomicUsize = AtomicUsize::new(0);
#[derive(Debug, PartialEq)]
struct DropCounter;
impl Drop for DropCounter {
fn drop(&mut self) {
DROPS.fetch_add(1, Ordering::SeqCst);
}
}
let mut rng = thread_rng();
for _ in 0..100 {
let steps = rng.gen_range(0, 10_000);
let additional = rng.gen_range(0, 1000);
DROPS.store(0, Ordering::SeqCst);
let (s, r) = channel::unbounded::<DropCounter>();
crossbeam::scope(|scope| {
scope.spawn(|| {
for _ in 0..steps {
r.recv().unwrap();
}
});
scope.spawn(|| {
for _ in 0..steps {
s.send(DropCounter);
}
});
});
for _ in 0..additional {
s.send(DropCounter);
}
assert_eq!(DROPS.load(Ordering::SeqCst), steps);
drop(s);
drop(r);
assert_eq!(DROPS.load(Ordering::SeqCst), steps + additional);
}
}
#[test]
fn linearizable() {
const COUNT: usize = 25_000;
const THREADS: usize = 4;
let (s, r) = channel::unbounded();
crossbeam::scope(|scope| {
for _ in 0..THREADS {
scope.spawn(|| {
for _ in 0..COUNT {
s.send(0);
r.try_recv().unwrap();
}
});
}
});
}
#[test]
fn fairness() {
const COUNT: usize = 10_000;
let (s1, r1) = channel::unbounded::<()>();
let (s2, r2) = channel::unbounded::<()>();
for _ in 0..COUNT {
s1.send(());
s2.send(());
}
let mut hits = [0usize; 2];
for _ in 0..COUNT {
select! {
recv(r1) => hits[0] += 1,
recv(r2) => hits[1] += 1,
}
}
assert!(hits.iter().all(|x| *x >= COUNT / hits.len() / 2));
}
#[test]
fn fairness_duplicates() {
const COUNT: usize = 10_000;
let (s, r) = channel::unbounded();
for _ in 0..COUNT {
s.send(());
}
let mut hits = [0usize; 5];
for _ in 0..COUNT {
select! {
recv(r) => hits[0] += 1,
recv(r) => hits[1] += 1,
recv(r) => hits[2] += 1,
recv(r) => hits[3] += 1,
recv(r) => hits[4] += 1,
}
}
assert!(hits.iter().all(|x| *x >= COUNT / hits.len() / 2));
}
#[test]
fn recv_in_send() {
let (s, r) = channel::unbounded();
s.send(());
select! {
send(s, assert_eq!(r.recv(), Some(()))) => {}
}
}
};
}
mod normal {
tests!(wrappers::normal);
}
mod cloned {
tests!(wrappers::cloned);
}
mod select {
tests!(wrappers::select);
}
mod select_spin {
tests!(wrappers::select_spin);
}
mod select_multi {
tests!(wrappers::select_multi);
}