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-rw-r--r--third_party/rust/crossbeam-channel/tests/mpsc.rs2129
1 files changed, 2129 insertions, 0 deletions
diff --git a/third_party/rust/crossbeam-channel/tests/mpsc.rs b/third_party/rust/crossbeam-channel/tests/mpsc.rs
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index 0000000000..d7cc8e25f4
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+++ b/third_party/rust/crossbeam-channel/tests/mpsc.rs
@@ -0,0 +1,2129 @@
+//! Tests copied from `std::sync::mpsc`.
+//!
+//! This is a copy of tests for the `std::sync::mpsc` channels from the standard library, but
+//! modified to work with `crossbeam-channel` instead.
+//!
+//! Minor tweaks were needed to make the tests compile:
+//!
+//! - Replace `box` syntax with `Box::new`.
+//! - Replace all uses of `Select` with `select!`.
+//! - Change the imports.
+//! - Join all spawned threads.
+//! - Removed assertion from oneshot_multi_thread_send_close_stress tests.
+//!
+//! Source:
+//! - https://github.com/rust-lang/rust/tree/master/src/libstd/sync/mpsc
+//!
+//! Copyright & License:
+//! - Copyright 2013-2014 The Rust Project Developers
+//! - Apache License, Version 2.0 or MIT license, at your option
+//! - https://github.com/rust-lang/rust/blob/master/COPYRIGHT
+//! - https://www.rust-lang.org/en-US/legal.html
+
+#![allow(
+ clippy::drop_copy,
+ clippy::match_single_binding,
+ clippy::redundant_clone
+)]
+
+use std::sync::mpsc::{RecvError, RecvTimeoutError, TryRecvError};
+use std::sync::mpsc::{SendError, TrySendError};
+use std::thread::JoinHandle;
+use std::time::Duration;
+
+use crossbeam_channel as cc;
+
+pub struct Sender<T> {
+ pub inner: cc::Sender<T>,
+}
+
+impl<T> Sender<T> {
+ pub fn send(&self, t: T) -> Result<(), SendError<T>> {
+ self.inner.send(t).map_err(|cc::SendError(m)| SendError(m))
+ }
+}
+
+impl<T> Clone for Sender<T> {
+ fn clone(&self) -> Sender<T> {
+ Sender {
+ inner: self.inner.clone(),
+ }
+ }
+}
+
+pub struct SyncSender<T> {
+ pub inner: cc::Sender<T>,
+}
+
+impl<T> SyncSender<T> {
+ pub fn send(&self, t: T) -> Result<(), SendError<T>> {
+ self.inner.send(t).map_err(|cc::SendError(m)| SendError(m))
+ }
+
+ pub fn try_send(&self, t: T) -> Result<(), TrySendError<T>> {
+ self.inner.try_send(t).map_err(|err| match err {
+ cc::TrySendError::Full(m) => TrySendError::Full(m),
+ cc::TrySendError::Disconnected(m) => TrySendError::Disconnected(m),
+ })
+ }
+}
+
+impl<T> Clone for SyncSender<T> {
+ fn clone(&self) -> SyncSender<T> {
+ SyncSender {
+ inner: self.inner.clone(),
+ }
+ }
+}
+
+pub struct Receiver<T> {
+ pub inner: cc::Receiver<T>,
+}
+
+impl<T> Receiver<T> {
+ pub fn try_recv(&self) -> Result<T, TryRecvError> {
+ self.inner.try_recv().map_err(|err| match err {
+ cc::TryRecvError::Empty => TryRecvError::Empty,
+ cc::TryRecvError::Disconnected => TryRecvError::Disconnected,
+ })
+ }
+
+ pub fn recv(&self) -> Result<T, RecvError> {
+ self.inner.recv().map_err(|_| RecvError)
+ }
+
+ pub fn recv_timeout(&self, timeout: Duration) -> Result<T, RecvTimeoutError> {
+ self.inner.recv_timeout(timeout).map_err(|err| match err {
+ cc::RecvTimeoutError::Timeout => RecvTimeoutError::Timeout,
+ cc::RecvTimeoutError::Disconnected => RecvTimeoutError::Disconnected,
+ })
+ }
+
+ pub fn iter(&self) -> Iter<T> {
+ Iter { inner: self }
+ }
+
+ pub fn try_iter(&self) -> TryIter<T> {
+ TryIter { inner: self }
+ }
+}
+
+impl<'a, T> IntoIterator for &'a Receiver<T> {
+ type Item = T;
+ type IntoIter = Iter<'a, T>;
+
+ fn into_iter(self) -> Iter<'a, T> {
+ self.iter()
+ }
+}
+
+impl<T> IntoIterator for Receiver<T> {
+ type Item = T;
+ type IntoIter = IntoIter<T>;
+
+ fn into_iter(self) -> IntoIter<T> {
+ IntoIter { inner: self }
+ }
+}
+
+pub struct TryIter<'a, T: 'a> {
+ inner: &'a Receiver<T>,
+}
+
+impl<'a, T> Iterator for TryIter<'a, T> {
+ type Item = T;
+
+ fn next(&mut self) -> Option<T> {
+ self.inner.try_recv().ok()
+ }
+}
+
+pub struct Iter<'a, T: 'a> {
+ inner: &'a Receiver<T>,
+}
+
+impl<'a, T> Iterator for Iter<'a, T> {
+ type Item = T;
+
+ fn next(&mut self) -> Option<T> {
+ self.inner.recv().ok()
+ }
+}
+
+pub struct IntoIter<T> {
+ inner: Receiver<T>,
+}
+
+impl<T> Iterator for IntoIter<T> {
+ type Item = T;
+
+ fn next(&mut self) -> Option<T> {
+ self.inner.recv().ok()
+ }
+}
+
+pub fn channel<T>() -> (Sender<T>, Receiver<T>) {
+ let (s, r) = cc::unbounded();
+ let s = Sender { inner: s };
+ let r = Receiver { inner: r };
+ (s, r)
+}
+
+pub fn sync_channel<T>(bound: usize) -> (SyncSender<T>, Receiver<T>) {
+ let (s, r) = cc::bounded(bound);
+ let s = SyncSender { inner: s };
+ let r = Receiver { inner: r };
+ (s, r)
+}
+
+macro_rules! select {
+ (
+ $($name:pat = $rx:ident.$meth:ident() => $code:expr),+
+ ) => ({
+ cc::crossbeam_channel_internal! {
+ $(
+ $meth(($rx).inner) -> res => {
+ let $name = res.map_err(|_| ::std::sync::mpsc::RecvError);
+ $code
+ }
+ )+
+ }
+ })
+}
+
+// Source: https://github.com/rust-lang/rust/blob/master/src/libstd/sync/mpsc/mod.rs
+mod channel_tests {
+ use super::*;
+
+ use std::env;
+ use std::thread;
+ use std::time::{Duration, Instant};
+
+ pub fn stress_factor() -> usize {
+ match env::var("RUST_TEST_STRESS") {
+ Ok(val) => val.parse().unwrap(),
+ Err(..) => 1,
+ }
+ }
+
+ #[test]
+ fn smoke() {
+ let (tx, rx) = channel::<i32>();
+ tx.send(1).unwrap();
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+
+ #[test]
+ fn drop_full() {
+ let (tx, _rx) = channel::<Box<isize>>();
+ tx.send(Box::new(1)).unwrap();
+ }
+
+ #[test]
+ fn drop_full_shared() {
+ let (tx, _rx) = channel::<Box<isize>>();
+ drop(tx.clone());
+ drop(tx.clone());
+ tx.send(Box::new(1)).unwrap();
+ }
+
+ #[test]
+ fn smoke_shared() {
+ let (tx, rx) = channel::<i32>();
+ tx.send(1).unwrap();
+ assert_eq!(rx.recv().unwrap(), 1);
+ let tx = tx.clone();
+ tx.send(1).unwrap();
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+
+ #[test]
+ fn smoke_threads() {
+ let (tx, rx) = channel::<i32>();
+ let t = thread::spawn(move || {
+ tx.send(1).unwrap();
+ });
+ assert_eq!(rx.recv().unwrap(), 1);
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn smoke_port_gone() {
+ let (tx, rx) = channel::<i32>();
+ drop(rx);
+ assert!(tx.send(1).is_err());
+ }
+
+ #[test]
+ fn smoke_shared_port_gone() {
+ let (tx, rx) = channel::<i32>();
+ drop(rx);
+ assert!(tx.send(1).is_err())
+ }
+
+ #[test]
+ fn smoke_shared_port_gone2() {
+ let (tx, rx) = channel::<i32>();
+ drop(rx);
+ let tx2 = tx.clone();
+ drop(tx);
+ assert!(tx2.send(1).is_err());
+ }
+
+ #[test]
+ fn port_gone_concurrent() {
+ let (tx, rx) = channel::<i32>();
+ let t = thread::spawn(move || {
+ rx.recv().unwrap();
+ });
+ while tx.send(1).is_ok() {}
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn port_gone_concurrent_shared() {
+ let (tx, rx) = channel::<i32>();
+ let tx2 = tx.clone();
+ let t = thread::spawn(move || {
+ rx.recv().unwrap();
+ });
+ while tx.send(1).is_ok() && tx2.send(1).is_ok() {}
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn smoke_chan_gone() {
+ let (tx, rx) = channel::<i32>();
+ drop(tx);
+ assert!(rx.recv().is_err());
+ }
+
+ #[test]
+ fn smoke_chan_gone_shared() {
+ let (tx, rx) = channel::<()>();
+ let tx2 = tx.clone();
+ drop(tx);
+ drop(tx2);
+ assert!(rx.recv().is_err());
+ }
+
+ #[test]
+ fn chan_gone_concurrent() {
+ let (tx, rx) = channel::<i32>();
+ let t = thread::spawn(move || {
+ tx.send(1).unwrap();
+ tx.send(1).unwrap();
+ });
+ while rx.recv().is_ok() {}
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn stress() {
+ #[cfg(miri)]
+ const COUNT: usize = 100;
+ #[cfg(not(miri))]
+ const COUNT: usize = 10000;
+
+ let (tx, rx) = channel::<i32>();
+ let t = thread::spawn(move || {
+ for _ in 0..COUNT {
+ tx.send(1).unwrap();
+ }
+ });
+ for _ in 0..COUNT {
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+ t.join().ok().unwrap();
+ }
+
+ #[test]
+ fn stress_shared() {
+ let amt: u32 = if cfg!(miri) { 100 } else { 10_000 };
+ let nthreads: u32 = if cfg!(miri) { 4 } else { 8 };
+ let (tx, rx) = channel::<i32>();
+
+ let t = thread::spawn(move || {
+ for _ in 0..amt * nthreads {
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+ assert!(rx.try_recv().is_err());
+ });
+
+ let mut ts = Vec::with_capacity(nthreads as usize);
+ for _ in 0..nthreads {
+ let tx = tx.clone();
+ let t = thread::spawn(move || {
+ for _ in 0..amt {
+ tx.send(1).unwrap();
+ }
+ });
+ ts.push(t);
+ }
+ drop(tx);
+ t.join().ok().unwrap();
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn send_from_outside_runtime() {
+ let (tx1, rx1) = channel::<()>();
+ let (tx2, rx2) = channel::<i32>();
+ let t1 = thread::spawn(move || {
+ tx1.send(()).unwrap();
+ for _ in 0..40 {
+ assert_eq!(rx2.recv().unwrap(), 1);
+ }
+ });
+ rx1.recv().unwrap();
+ let t2 = thread::spawn(move || {
+ for _ in 0..40 {
+ tx2.send(1).unwrap();
+ }
+ });
+ t1.join().ok().unwrap();
+ t2.join().ok().unwrap();
+ }
+
+ #[test]
+ fn recv_from_outside_runtime() {
+ let (tx, rx) = channel::<i32>();
+ let t = thread::spawn(move || {
+ for _ in 0..40 {
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+ });
+ for _ in 0..40 {
+ tx.send(1).unwrap();
+ }
+ t.join().ok().unwrap();
+ }
+
+ #[test]
+ fn no_runtime() {
+ let (tx1, rx1) = channel::<i32>();
+ let (tx2, rx2) = channel::<i32>();
+ let t1 = thread::spawn(move || {
+ assert_eq!(rx1.recv().unwrap(), 1);
+ tx2.send(2).unwrap();
+ });
+ let t2 = thread::spawn(move || {
+ tx1.send(1).unwrap();
+ assert_eq!(rx2.recv().unwrap(), 2);
+ });
+ t1.join().ok().unwrap();
+ t2.join().ok().unwrap();
+ }
+
+ #[test]
+ fn oneshot_single_thread_close_port_first() {
+ // Simple test of closing without sending
+ let (_tx, rx) = channel::<i32>();
+ drop(rx);
+ }
+
+ #[test]
+ fn oneshot_single_thread_close_chan_first() {
+ // Simple test of closing without sending
+ let (tx, _rx) = channel::<i32>();
+ drop(tx);
+ }
+
+ #[test]
+ fn oneshot_single_thread_send_port_close() {
+ // Testing that the sender cleans up the payload if receiver is closed
+ let (tx, rx) = channel::<Box<i32>>();
+ drop(rx);
+ assert!(tx.send(Box::new(0)).is_err());
+ }
+
+ #[test]
+ fn oneshot_single_thread_recv_chan_close() {
+ let (tx, rx) = channel::<i32>();
+ drop(tx);
+ assert_eq!(rx.recv(), Err(RecvError));
+ }
+
+ #[test]
+ fn oneshot_single_thread_send_then_recv() {
+ let (tx, rx) = channel::<Box<i32>>();
+ tx.send(Box::new(10)).unwrap();
+ assert!(*rx.recv().unwrap() == 10);
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_send_open() {
+ let (tx, rx) = channel::<i32>();
+ assert!(tx.send(10).is_ok());
+ assert!(rx.recv().unwrap() == 10);
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_send_closed() {
+ let (tx, rx) = channel::<i32>();
+ drop(rx);
+ assert!(tx.send(10).is_err());
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_recv_open() {
+ let (tx, rx) = channel::<i32>();
+ tx.send(10).unwrap();
+ assert!(rx.recv() == Ok(10));
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_recv_closed() {
+ let (tx, rx) = channel::<i32>();
+ drop(tx);
+ assert!(rx.recv().is_err());
+ }
+
+ #[test]
+ fn oneshot_single_thread_peek_data() {
+ let (tx, rx) = channel::<i32>();
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Empty));
+ tx.send(10).unwrap();
+ assert_eq!(rx.try_recv(), Ok(10));
+ }
+
+ #[test]
+ fn oneshot_single_thread_peek_close() {
+ let (tx, rx) = channel::<i32>();
+ drop(tx);
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected));
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected));
+ }
+
+ #[test]
+ fn oneshot_single_thread_peek_open() {
+ let (_tx, rx) = channel::<i32>();
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Empty));
+ }
+
+ #[test]
+ fn oneshot_multi_task_recv_then_send() {
+ let (tx, rx) = channel::<Box<i32>>();
+ let t = thread::spawn(move || {
+ assert!(*rx.recv().unwrap() == 10);
+ });
+
+ tx.send(Box::new(10)).unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn oneshot_multi_task_recv_then_close() {
+ let (tx, rx) = channel::<Box<i32>>();
+ let t = thread::spawn(move || {
+ drop(tx);
+ });
+ thread::spawn(move || {
+ assert_eq!(rx.recv(), Err(RecvError));
+ })
+ .join()
+ .unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn oneshot_multi_thread_close_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = channel::<i32>();
+ let t = thread::spawn(move || {
+ drop(rx);
+ });
+ ts.push(t);
+ drop(tx);
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn oneshot_multi_thread_send_close_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(2 * stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = channel::<i32>();
+ let t = thread::spawn(move || {
+ drop(rx);
+ });
+ ts.push(t);
+ thread::spawn(move || {
+ let _ = tx.send(1);
+ })
+ .join()
+ .unwrap();
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn oneshot_multi_thread_recv_close_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(2 * stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = channel::<i32>();
+ let t = thread::spawn(move || {
+ thread::spawn(move || {
+ assert_eq!(rx.recv(), Err(RecvError));
+ })
+ .join()
+ .unwrap();
+ });
+ ts.push(t);
+ let t2 = thread::spawn(move || {
+ let t = thread::spawn(move || {
+ drop(tx);
+ });
+ t.join().unwrap();
+ });
+ ts.push(t2);
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn oneshot_multi_thread_send_recv_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = channel::<Box<isize>>();
+ let t = thread::spawn(move || {
+ tx.send(Box::new(10)).unwrap();
+ });
+ ts.push(t);
+ assert!(*rx.recv().unwrap() == 10);
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn stream_send_recv_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(2 * stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = channel();
+
+ if let Some(t) = send(tx, 0) {
+ ts.push(t);
+ }
+ if let Some(t2) = recv(rx, 0) {
+ ts.push(t2);
+ }
+
+ fn send(tx: Sender<Box<i32>>, i: i32) -> Option<JoinHandle<()>> {
+ if i == 10 {
+ return None;
+ }
+
+ Some(thread::spawn(move || {
+ tx.send(Box::new(i)).unwrap();
+ send(tx, i + 1);
+ }))
+ }
+
+ fn recv(rx: Receiver<Box<i32>>, i: i32) -> Option<JoinHandle<()>> {
+ if i == 10 {
+ return None;
+ }
+
+ Some(thread::spawn(move || {
+ assert!(*rx.recv().unwrap() == i);
+ recv(rx, i + 1);
+ }))
+ }
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn oneshot_single_thread_recv_timeout() {
+ let (tx, rx) = channel();
+ tx.send(()).unwrap();
+ assert_eq!(rx.recv_timeout(Duration::from_millis(1)), Ok(()));
+ assert_eq!(
+ rx.recv_timeout(Duration::from_millis(1)),
+ Err(RecvTimeoutError::Timeout)
+ );
+ tx.send(()).unwrap();
+ assert_eq!(rx.recv_timeout(Duration::from_millis(1)), Ok(()));
+ }
+
+ #[test]
+ fn stress_recv_timeout_two_threads() {
+ let (tx, rx) = channel();
+ let stress = stress_factor() + 100;
+ let timeout = Duration::from_millis(100);
+
+ let t = thread::spawn(move || {
+ for i in 0..stress {
+ if i % 2 == 0 {
+ thread::sleep(timeout * 2);
+ }
+ tx.send(1usize).unwrap();
+ }
+ });
+
+ let mut recv_count = 0;
+ loop {
+ match rx.recv_timeout(timeout) {
+ Ok(n) => {
+ assert_eq!(n, 1usize);
+ recv_count += 1;
+ }
+ Err(RecvTimeoutError::Timeout) => continue,
+ Err(RecvTimeoutError::Disconnected) => break,
+ }
+ }
+
+ assert_eq!(recv_count, stress);
+ t.join().unwrap()
+ }
+
+ #[test]
+ fn recv_timeout_upgrade() {
+ let (tx, rx) = channel::<()>();
+ let timeout = Duration::from_millis(1);
+ let _tx_clone = tx.clone();
+
+ let start = Instant::now();
+ assert_eq!(rx.recv_timeout(timeout), Err(RecvTimeoutError::Timeout));
+ assert!(Instant::now() >= start + timeout);
+ }
+
+ #[test]
+ fn stress_recv_timeout_shared() {
+ let (tx, rx) = channel();
+ let stress = stress_factor() + 100;
+
+ let mut ts = Vec::with_capacity(stress);
+ for i in 0..stress {
+ let tx = tx.clone();
+ let t = thread::spawn(move || {
+ thread::sleep(Duration::from_millis(i as u64 * 10));
+ tx.send(1usize).unwrap();
+ });
+ ts.push(t);
+ }
+
+ drop(tx);
+
+ let mut recv_count = 0;
+ loop {
+ match rx.recv_timeout(Duration::from_millis(10)) {
+ Ok(n) => {
+ assert_eq!(n, 1usize);
+ recv_count += 1;
+ }
+ Err(RecvTimeoutError::Timeout) => continue,
+ Err(RecvTimeoutError::Disconnected) => break,
+ }
+ }
+
+ assert_eq!(recv_count, stress);
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn recv_a_lot() {
+ #[cfg(miri)]
+ const N: usize = 50;
+ #[cfg(not(miri))]
+ const N: usize = 10000;
+
+ // Regression test that we don't run out of stack in scheduler context
+ let (tx, rx) = channel();
+ for _ in 0..N {
+ tx.send(()).unwrap();
+ }
+ for _ in 0..N {
+ rx.recv().unwrap();
+ }
+ }
+
+ #[test]
+ fn shared_recv_timeout() {
+ let (tx, rx) = channel();
+ let total = 5;
+ let mut ts = Vec::with_capacity(total);
+ for _ in 0..total {
+ let tx = tx.clone();
+ let t = thread::spawn(move || {
+ tx.send(()).unwrap();
+ });
+ ts.push(t);
+ }
+
+ for _ in 0..total {
+ rx.recv().unwrap();
+ }
+
+ assert_eq!(
+ rx.recv_timeout(Duration::from_millis(1)),
+ Err(RecvTimeoutError::Timeout)
+ );
+ tx.send(()).unwrap();
+ assert_eq!(rx.recv_timeout(Duration::from_millis(1)), Ok(()));
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn shared_chan_stress() {
+ let (tx, rx) = channel();
+ let total = stress_factor() + 100;
+ let mut ts = Vec::with_capacity(total);
+ for _ in 0..total {
+ let tx = tx.clone();
+ let t = thread::spawn(move || {
+ tx.send(()).unwrap();
+ });
+ ts.push(t);
+ }
+
+ for _ in 0..total {
+ rx.recv().unwrap();
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn test_nested_recv_iter() {
+ let (tx, rx) = channel::<i32>();
+ let (total_tx, total_rx) = channel::<i32>();
+
+ let t = thread::spawn(move || {
+ let mut acc = 0;
+ for x in rx.iter() {
+ acc += x;
+ }
+ total_tx.send(acc).unwrap();
+ });
+
+ tx.send(3).unwrap();
+ tx.send(1).unwrap();
+ tx.send(2).unwrap();
+ drop(tx);
+ assert_eq!(total_rx.recv().unwrap(), 6);
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn test_recv_iter_break() {
+ let (tx, rx) = channel::<i32>();
+ let (count_tx, count_rx) = channel();
+
+ let t = thread::spawn(move || {
+ let mut count = 0;
+ for x in rx.iter() {
+ if count >= 3 {
+ break;
+ } else {
+ count += x;
+ }
+ }
+ count_tx.send(count).unwrap();
+ });
+
+ tx.send(2).unwrap();
+ tx.send(2).unwrap();
+ tx.send(2).unwrap();
+ let _ = tx.send(2);
+ drop(tx);
+ assert_eq!(count_rx.recv().unwrap(), 4);
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn test_recv_try_iter() {
+ let (request_tx, request_rx) = channel();
+ let (response_tx, response_rx) = channel();
+
+ // Request `x`s until we have `6`.
+ let t = thread::spawn(move || {
+ let mut count = 0;
+ loop {
+ for x in response_rx.try_iter() {
+ count += x;
+ if count == 6 {
+ return count;
+ }
+ }
+ request_tx.send(()).unwrap();
+ }
+ });
+
+ for _ in request_rx.iter() {
+ if response_tx.send(2).is_err() {
+ break;
+ }
+ }
+
+ assert_eq!(t.join().unwrap(), 6);
+ }
+
+ #[test]
+ fn test_recv_into_iter_owned() {
+ let mut iter = {
+ let (tx, rx) = channel::<i32>();
+ tx.send(1).unwrap();
+ tx.send(2).unwrap();
+
+ rx.into_iter()
+ };
+ assert_eq!(iter.next().unwrap(), 1);
+ assert_eq!(iter.next().unwrap(), 2);
+ assert!(iter.next().is_none());
+ }
+
+ #[test]
+ fn test_recv_into_iter_borrowed() {
+ let (tx, rx) = channel::<i32>();
+ tx.send(1).unwrap();
+ tx.send(2).unwrap();
+ drop(tx);
+ let mut iter = (&rx).into_iter();
+ assert_eq!(iter.next().unwrap(), 1);
+ assert_eq!(iter.next().unwrap(), 2);
+ assert!(iter.next().is_none());
+ }
+
+ #[test]
+ fn try_recv_states() {
+ let (tx1, rx1) = channel::<i32>();
+ let (tx2, rx2) = channel::<()>();
+ let (tx3, rx3) = channel::<()>();
+ let t = thread::spawn(move || {
+ rx2.recv().unwrap();
+ tx1.send(1).unwrap();
+ tx3.send(()).unwrap();
+ rx2.recv().unwrap();
+ drop(tx1);
+ tx3.send(()).unwrap();
+ });
+
+ assert_eq!(rx1.try_recv(), Err(TryRecvError::Empty));
+ tx2.send(()).unwrap();
+ rx3.recv().unwrap();
+ assert_eq!(rx1.try_recv(), Ok(1));
+ assert_eq!(rx1.try_recv(), Err(TryRecvError::Empty));
+ tx2.send(()).unwrap();
+ rx3.recv().unwrap();
+ assert_eq!(rx1.try_recv(), Err(TryRecvError::Disconnected));
+ t.join().unwrap();
+ }
+
+ // This bug used to end up in a livelock inside of the Receiver destructor
+ // because the internal state of the Shared packet was corrupted
+ #[test]
+ fn destroy_upgraded_shared_port_when_sender_still_active() {
+ let (tx, rx) = channel();
+ let (tx2, rx2) = channel();
+ let t = thread::spawn(move || {
+ rx.recv().unwrap(); // wait on a oneshot
+ drop(rx); // destroy a shared
+ tx2.send(()).unwrap();
+ });
+ // make sure the other thread has gone to sleep
+ for _ in 0..5000 {
+ thread::yield_now();
+ }
+
+ // upgrade to a shared chan and send a message
+ let tx2 = tx.clone();
+ drop(tx);
+ tx2.send(()).unwrap();
+
+ // wait for the child thread to exit before we exit
+ rx2.recv().unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn issue_32114() {
+ let (tx, _) = channel();
+ let _ = tx.send(123);
+ assert_eq!(tx.send(123), Err(SendError(123)));
+ }
+}
+
+// Source: https://github.com/rust-lang/rust/blob/master/src/libstd/sync/mpsc/mod.rs
+mod sync_channel_tests {
+ use super::*;
+
+ use std::env;
+ use std::thread;
+ use std::time::Duration;
+
+ pub fn stress_factor() -> usize {
+ match env::var("RUST_TEST_STRESS") {
+ Ok(val) => val.parse().unwrap(),
+ Err(..) => 1,
+ }
+ }
+
+ #[test]
+ fn smoke() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ tx.send(1).unwrap();
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+
+ #[test]
+ fn drop_full() {
+ let (tx, _rx) = sync_channel::<Box<isize>>(1);
+ tx.send(Box::new(1)).unwrap();
+ }
+
+ #[test]
+ fn smoke_shared() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ tx.send(1).unwrap();
+ assert_eq!(rx.recv().unwrap(), 1);
+ let tx = tx.clone();
+ tx.send(1).unwrap();
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+
+ #[test]
+ fn recv_timeout() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ assert_eq!(
+ rx.recv_timeout(Duration::from_millis(1)),
+ Err(RecvTimeoutError::Timeout)
+ );
+ tx.send(1).unwrap();
+ assert_eq!(rx.recv_timeout(Duration::from_millis(1)), Ok(1));
+ }
+
+ #[test]
+ fn smoke_threads() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ tx.send(1).unwrap();
+ });
+ assert_eq!(rx.recv().unwrap(), 1);
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn smoke_port_gone() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ drop(rx);
+ assert!(tx.send(1).is_err());
+ }
+
+ #[test]
+ fn smoke_shared_port_gone2() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ drop(rx);
+ let tx2 = tx.clone();
+ drop(tx);
+ assert!(tx2.send(1).is_err());
+ }
+
+ #[test]
+ fn port_gone_concurrent() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ rx.recv().unwrap();
+ });
+ while tx.send(1).is_ok() {}
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn port_gone_concurrent_shared() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let tx2 = tx.clone();
+ let t = thread::spawn(move || {
+ rx.recv().unwrap();
+ });
+ while tx.send(1).is_ok() && tx2.send(1).is_ok() {}
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn smoke_chan_gone() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ drop(tx);
+ assert!(rx.recv().is_err());
+ }
+
+ #[test]
+ fn smoke_chan_gone_shared() {
+ let (tx, rx) = sync_channel::<()>(0);
+ let tx2 = tx.clone();
+ drop(tx);
+ drop(tx2);
+ assert!(rx.recv().is_err());
+ }
+
+ #[test]
+ fn chan_gone_concurrent() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ tx.send(1).unwrap();
+ tx.send(1).unwrap();
+ });
+ while rx.recv().is_ok() {}
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn stress() {
+ #[cfg(miri)]
+ const N: usize = 100;
+ #[cfg(not(miri))]
+ const N: usize = 10000;
+
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ for _ in 0..N {
+ tx.send(1).unwrap();
+ }
+ });
+ for _ in 0..N {
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn stress_recv_timeout_two_threads() {
+ #[cfg(miri)]
+ const N: usize = 100;
+ #[cfg(not(miri))]
+ const N: usize = 10000;
+
+ let (tx, rx) = sync_channel::<i32>(0);
+
+ let t = thread::spawn(move || {
+ for _ in 0..N {
+ tx.send(1).unwrap();
+ }
+ });
+
+ let mut recv_count = 0;
+ loop {
+ match rx.recv_timeout(Duration::from_millis(1)) {
+ Ok(v) => {
+ assert_eq!(v, 1);
+ recv_count += 1;
+ }
+ Err(RecvTimeoutError::Timeout) => continue,
+ Err(RecvTimeoutError::Disconnected) => break,
+ }
+ }
+
+ assert_eq!(recv_count, N);
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn stress_recv_timeout_shared() {
+ #[cfg(miri)]
+ const AMT: u32 = 100;
+ #[cfg(not(miri))]
+ const AMT: u32 = 1000;
+ const NTHREADS: u32 = 8;
+ let (tx, rx) = sync_channel::<i32>(0);
+ let (dtx, drx) = sync_channel::<()>(0);
+
+ let t = thread::spawn(move || {
+ let mut recv_count = 0;
+ loop {
+ match rx.recv_timeout(Duration::from_millis(10)) {
+ Ok(v) => {
+ assert_eq!(v, 1);
+ recv_count += 1;
+ }
+ Err(RecvTimeoutError::Timeout) => continue,
+ Err(RecvTimeoutError::Disconnected) => break,
+ }
+ }
+
+ assert_eq!(recv_count, AMT * NTHREADS);
+ assert!(rx.try_recv().is_err());
+
+ dtx.send(()).unwrap();
+ });
+
+ let mut ts = Vec::with_capacity(NTHREADS as usize);
+ for _ in 0..NTHREADS {
+ let tx = tx.clone();
+ let t = thread::spawn(move || {
+ for _ in 0..AMT {
+ tx.send(1).unwrap();
+ }
+ });
+ ts.push(t);
+ }
+
+ drop(tx);
+
+ drx.recv().unwrap();
+ for t in ts {
+ t.join().unwrap();
+ }
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn stress_shared() {
+ #[cfg(miri)]
+ const AMT: u32 = 100;
+ #[cfg(not(miri))]
+ const AMT: u32 = 1000;
+ const NTHREADS: u32 = 8;
+ let (tx, rx) = sync_channel::<i32>(0);
+ let (dtx, drx) = sync_channel::<()>(0);
+
+ let t = thread::spawn(move || {
+ for _ in 0..AMT * NTHREADS {
+ assert_eq!(rx.recv().unwrap(), 1);
+ }
+ assert!(rx.try_recv().is_err());
+ dtx.send(()).unwrap();
+ });
+
+ let mut ts = Vec::with_capacity(NTHREADS as usize);
+ for _ in 0..NTHREADS {
+ let tx = tx.clone();
+ let t = thread::spawn(move || {
+ for _ in 0..AMT {
+ tx.send(1).unwrap();
+ }
+ });
+ ts.push(t);
+ }
+ drop(tx);
+ drx.recv().unwrap();
+ for t in ts {
+ t.join().unwrap();
+ }
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn oneshot_single_thread_close_port_first() {
+ // Simple test of closing without sending
+ let (_tx, rx) = sync_channel::<i32>(0);
+ drop(rx);
+ }
+
+ #[test]
+ fn oneshot_single_thread_close_chan_first() {
+ // Simple test of closing without sending
+ let (tx, _rx) = sync_channel::<i32>(0);
+ drop(tx);
+ }
+
+ #[test]
+ fn oneshot_single_thread_send_port_close() {
+ // Testing that the sender cleans up the payload if receiver is closed
+ let (tx, rx) = sync_channel::<Box<i32>>(0);
+ drop(rx);
+ assert!(tx.send(Box::new(0)).is_err());
+ }
+
+ #[test]
+ fn oneshot_single_thread_recv_chan_close() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ drop(tx);
+ assert_eq!(rx.recv(), Err(RecvError));
+ }
+
+ #[test]
+ fn oneshot_single_thread_send_then_recv() {
+ let (tx, rx) = sync_channel::<Box<i32>>(1);
+ tx.send(Box::new(10)).unwrap();
+ assert!(*rx.recv().unwrap() == 10);
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_send_open() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ assert_eq!(tx.try_send(10), Ok(()));
+ assert!(rx.recv().unwrap() == 10);
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_send_closed() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ drop(rx);
+ assert_eq!(tx.try_send(10), Err(TrySendError::Disconnected(10)));
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_send_closed2() {
+ let (tx, _rx) = sync_channel::<i32>(0);
+ assert_eq!(tx.try_send(10), Err(TrySendError::Full(10)));
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_recv_open() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ tx.send(10).unwrap();
+ assert!(rx.recv() == Ok(10));
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_recv_closed() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ drop(tx);
+ assert!(rx.recv().is_err());
+ }
+
+ #[test]
+ fn oneshot_single_thread_try_recv_closed_with_data() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ tx.send(10).unwrap();
+ drop(tx);
+ assert_eq!(rx.try_recv(), Ok(10));
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected));
+ }
+
+ #[test]
+ fn oneshot_single_thread_peek_data() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Empty));
+ tx.send(10).unwrap();
+ assert_eq!(rx.try_recv(), Ok(10));
+ }
+
+ #[test]
+ fn oneshot_single_thread_peek_close() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ drop(tx);
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected));
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected));
+ }
+
+ #[test]
+ fn oneshot_single_thread_peek_open() {
+ let (_tx, rx) = sync_channel::<i32>(0);
+ assert_eq!(rx.try_recv(), Err(TryRecvError::Empty));
+ }
+
+ #[test]
+ fn oneshot_multi_task_recv_then_send() {
+ let (tx, rx) = sync_channel::<Box<i32>>(0);
+ let t = thread::spawn(move || {
+ assert!(*rx.recv().unwrap() == 10);
+ });
+
+ tx.send(Box::new(10)).unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn oneshot_multi_task_recv_then_close() {
+ let (tx, rx) = sync_channel::<Box<i32>>(0);
+ let t = thread::spawn(move || {
+ drop(tx);
+ });
+ thread::spawn(move || {
+ assert_eq!(rx.recv(), Err(RecvError));
+ })
+ .join()
+ .unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn oneshot_multi_thread_close_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ drop(rx);
+ });
+ ts.push(t);
+ drop(tx);
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn oneshot_multi_thread_send_close_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ drop(rx);
+ });
+ ts.push(t);
+ thread::spawn(move || {
+ let _ = tx.send(1);
+ })
+ .join()
+ .unwrap();
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn oneshot_multi_thread_recv_close_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(2 * stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ thread::spawn(move || {
+ assert_eq!(rx.recv(), Err(RecvError));
+ })
+ .join()
+ .unwrap();
+ });
+ ts.push(t);
+ let t2 = thread::spawn(move || {
+ thread::spawn(move || {
+ drop(tx);
+ });
+ });
+ ts.push(t2);
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn oneshot_multi_thread_send_recv_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = sync_channel::<Box<i32>>(0);
+ let t = thread::spawn(move || {
+ tx.send(Box::new(10)).unwrap();
+ });
+ ts.push(t);
+ assert!(*rx.recv().unwrap() == 10);
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn stream_send_recv_stress() {
+ let stress_factor = stress_factor();
+ let mut ts = Vec::with_capacity(2 * stress_factor);
+ for _ in 0..stress_factor {
+ let (tx, rx) = sync_channel::<Box<i32>>(0);
+
+ if let Some(t) = send(tx, 0) {
+ ts.push(t);
+ }
+ if let Some(t) = recv(rx, 0) {
+ ts.push(t);
+ }
+
+ fn send(tx: SyncSender<Box<i32>>, i: i32) -> Option<JoinHandle<()>> {
+ if i == 10 {
+ return None;
+ }
+
+ Some(thread::spawn(move || {
+ tx.send(Box::new(i)).unwrap();
+ send(tx, i + 1);
+ }))
+ }
+
+ fn recv(rx: Receiver<Box<i32>>, i: i32) -> Option<JoinHandle<()>> {
+ if i == 10 {
+ return None;
+ }
+
+ Some(thread::spawn(move || {
+ assert!(*rx.recv().unwrap() == i);
+ recv(rx, i + 1);
+ }))
+ }
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn recv_a_lot() {
+ #[cfg(miri)]
+ const N: usize = 100;
+ #[cfg(not(miri))]
+ const N: usize = 10000;
+
+ // Regression test that we don't run out of stack in scheduler context
+ let (tx, rx) = sync_channel(N);
+ for _ in 0..N {
+ tx.send(()).unwrap();
+ }
+ for _ in 0..N {
+ rx.recv().unwrap();
+ }
+ }
+
+ #[test]
+ fn shared_chan_stress() {
+ let (tx, rx) = sync_channel(0);
+ let total = stress_factor() + 100;
+ let mut ts = Vec::with_capacity(total);
+ for _ in 0..total {
+ let tx = tx.clone();
+ let t = thread::spawn(move || {
+ tx.send(()).unwrap();
+ });
+ ts.push(t);
+ }
+
+ for _ in 0..total {
+ rx.recv().unwrap();
+ }
+ for t in ts {
+ t.join().unwrap();
+ }
+ }
+
+ #[test]
+ fn test_nested_recv_iter() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let (total_tx, total_rx) = sync_channel::<i32>(0);
+
+ let t = thread::spawn(move || {
+ let mut acc = 0;
+ for x in rx.iter() {
+ acc += x;
+ }
+ total_tx.send(acc).unwrap();
+ });
+
+ tx.send(3).unwrap();
+ tx.send(1).unwrap();
+ tx.send(2).unwrap();
+ drop(tx);
+ assert_eq!(total_rx.recv().unwrap(), 6);
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn test_recv_iter_break() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let (count_tx, count_rx) = sync_channel(0);
+
+ let t = thread::spawn(move || {
+ let mut count = 0;
+ for x in rx.iter() {
+ if count >= 3 {
+ break;
+ } else {
+ count += x;
+ }
+ }
+ count_tx.send(count).unwrap();
+ });
+
+ tx.send(2).unwrap();
+ tx.send(2).unwrap();
+ tx.send(2).unwrap();
+ let _ = tx.try_send(2);
+ drop(tx);
+ assert_eq!(count_rx.recv().unwrap(), 4);
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn try_recv_states() {
+ let (tx1, rx1) = sync_channel::<i32>(1);
+ let (tx2, rx2) = sync_channel::<()>(1);
+ let (tx3, rx3) = sync_channel::<()>(1);
+ let t = thread::spawn(move || {
+ rx2.recv().unwrap();
+ tx1.send(1).unwrap();
+ tx3.send(()).unwrap();
+ rx2.recv().unwrap();
+ drop(tx1);
+ tx3.send(()).unwrap();
+ });
+
+ assert_eq!(rx1.try_recv(), Err(TryRecvError::Empty));
+ tx2.send(()).unwrap();
+ rx3.recv().unwrap();
+ assert_eq!(rx1.try_recv(), Ok(1));
+ assert_eq!(rx1.try_recv(), Err(TryRecvError::Empty));
+ tx2.send(()).unwrap();
+ rx3.recv().unwrap();
+ assert_eq!(rx1.try_recv(), Err(TryRecvError::Disconnected));
+ t.join().unwrap();
+ }
+
+ // This bug used to end up in a livelock inside of the Receiver destructor
+ // because the internal state of the Shared packet was corrupted
+ #[test]
+ fn destroy_upgraded_shared_port_when_sender_still_active() {
+ let (tx, rx) = sync_channel::<()>(0);
+ let (tx2, rx2) = sync_channel::<()>(0);
+ let t = thread::spawn(move || {
+ rx.recv().unwrap(); // wait on a oneshot
+ drop(rx); // destroy a shared
+ tx2.send(()).unwrap();
+ });
+ // make sure the other thread has gone to sleep
+ for _ in 0..5000 {
+ thread::yield_now();
+ }
+
+ // upgrade to a shared chan and send a message
+ let tx2 = tx.clone();
+ drop(tx);
+ tx2.send(()).unwrap();
+
+ // wait for the child thread to exit before we exit
+ rx2.recv().unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn send1() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ rx.recv().unwrap();
+ });
+ assert_eq!(tx.send(1), Ok(()));
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn send2() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ drop(rx);
+ });
+ assert!(tx.send(1).is_err());
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn send3() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ assert_eq!(tx.send(1), Ok(()));
+ let t = thread::spawn(move || {
+ drop(rx);
+ });
+ assert!(tx.send(1).is_err());
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn send4() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let tx2 = tx.clone();
+ let (done, donerx) = channel();
+ let done2 = done.clone();
+ let t = thread::spawn(move || {
+ assert!(tx.send(1).is_err());
+ done.send(()).unwrap();
+ });
+ let t2 = thread::spawn(move || {
+ assert!(tx2.send(2).is_err());
+ done2.send(()).unwrap();
+ });
+ drop(rx);
+ donerx.recv().unwrap();
+ donerx.recv().unwrap();
+ t.join().unwrap();
+ t2.join().unwrap();
+ }
+
+ #[test]
+ fn try_send1() {
+ let (tx, _rx) = sync_channel::<i32>(0);
+ assert_eq!(tx.try_send(1), Err(TrySendError::Full(1)));
+ }
+
+ #[test]
+ fn try_send2() {
+ let (tx, _rx) = sync_channel::<i32>(1);
+ assert_eq!(tx.try_send(1), Ok(()));
+ assert_eq!(tx.try_send(1), Err(TrySendError::Full(1)));
+ }
+
+ #[test]
+ fn try_send3() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ assert_eq!(tx.try_send(1), Ok(()));
+ drop(rx);
+ assert_eq!(tx.try_send(1), Err(TrySendError::Disconnected(1)));
+ }
+
+ #[test]
+ fn issue_15761() {
+ fn repro() {
+ let (tx1, rx1) = sync_channel::<()>(3);
+ let (tx2, rx2) = sync_channel::<()>(3);
+
+ let _t = thread::spawn(move || {
+ rx1.recv().unwrap();
+ tx2.try_send(()).unwrap();
+ });
+
+ tx1.try_send(()).unwrap();
+ rx2.recv().unwrap();
+ }
+
+ for _ in 0..100 {
+ repro()
+ }
+ }
+}
+
+// Source: https://github.com/rust-lang/rust/blob/master/src/libstd/sync/mpsc/select.rs
+mod select_tests {
+ use super::*;
+
+ use std::thread;
+
+ #[test]
+ fn smoke() {
+ let (tx1, rx1) = channel::<i32>();
+ let (tx2, rx2) = channel::<i32>();
+ tx1.send(1).unwrap();
+ select! {
+ foo = rx1.recv() => assert_eq!(foo.unwrap(), 1),
+ _bar = rx2.recv() => panic!()
+ }
+ tx2.send(2).unwrap();
+ select! {
+ _foo = rx1.recv() => panic!(),
+ bar = rx2.recv() => assert_eq!(bar.unwrap(), 2)
+ }
+ drop(tx1);
+ select! {
+ foo = rx1.recv() => assert!(foo.is_err()),
+ _bar = rx2.recv() => panic!()
+ }
+ drop(tx2);
+ select! {
+ bar = rx2.recv() => assert!(bar.is_err())
+ }
+ }
+
+ #[test]
+ fn smoke2() {
+ let (_tx1, rx1) = channel::<i32>();
+ let (_tx2, rx2) = channel::<i32>();
+ let (_tx3, rx3) = channel::<i32>();
+ let (_tx4, rx4) = channel::<i32>();
+ let (tx5, rx5) = channel::<i32>();
+ tx5.send(4).unwrap();
+ select! {
+ _foo = rx1.recv() => panic!("1"),
+ _foo = rx2.recv() => panic!("2"),
+ _foo = rx3.recv() => panic!("3"),
+ _foo = rx4.recv() => panic!("4"),
+ foo = rx5.recv() => assert_eq!(foo.unwrap(), 4)
+ }
+ }
+
+ #[test]
+ fn closed() {
+ let (_tx1, rx1) = channel::<i32>();
+ let (tx2, rx2) = channel::<i32>();
+ drop(tx2);
+
+ select! {
+ _a1 = rx1.recv() => panic!(),
+ a2 = rx2.recv() => assert!(a2.is_err())
+ }
+ }
+
+ #[test]
+ fn unblocks() {
+ let (tx1, rx1) = channel::<i32>();
+ let (_tx2, rx2) = channel::<i32>();
+ let (tx3, rx3) = channel::<i32>();
+
+ let t = thread::spawn(move || {
+ for _ in 0..20 {
+ thread::yield_now();
+ }
+ tx1.send(1).unwrap();
+ rx3.recv().unwrap();
+ for _ in 0..20 {
+ thread::yield_now();
+ }
+ });
+
+ select! {
+ a = rx1.recv() => assert_eq!(a.unwrap(), 1),
+ _b = rx2.recv() => panic!()
+ }
+ tx3.send(1).unwrap();
+ select! {
+ a = rx1.recv() => assert!(a.is_err()),
+ _b = rx2.recv() => panic!()
+ }
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn both_ready() {
+ let (tx1, rx1) = channel::<i32>();
+ let (tx2, rx2) = channel::<i32>();
+ let (tx3, rx3) = channel::<()>();
+
+ let t = thread::spawn(move || {
+ for _ in 0..20 {
+ thread::yield_now();
+ }
+ tx1.send(1).unwrap();
+ tx2.send(2).unwrap();
+ rx3.recv().unwrap();
+ });
+
+ select! {
+ a = rx1.recv() => { assert_eq!(a.unwrap(), 1); },
+ a = rx2.recv() => { assert_eq!(a.unwrap(), 2); }
+ }
+ select! {
+ a = rx1.recv() => { assert_eq!(a.unwrap(), 1); },
+ a = rx2.recv() => { assert_eq!(a.unwrap(), 2); }
+ }
+ assert_eq!(rx1.try_recv(), Err(TryRecvError::Empty));
+ assert_eq!(rx2.try_recv(), Err(TryRecvError::Empty));
+ tx3.send(()).unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn stress() {
+ #[cfg(miri)]
+ const AMT: i32 = 100;
+ #[cfg(not(miri))]
+ const AMT: i32 = 10000;
+
+ let (tx1, rx1) = channel::<i32>();
+ let (tx2, rx2) = channel::<i32>();
+ let (tx3, rx3) = channel::<()>();
+
+ let t = thread::spawn(move || {
+ for i in 0..AMT {
+ if i % 2 == 0 {
+ tx1.send(i).unwrap();
+ } else {
+ tx2.send(i).unwrap();
+ }
+ rx3.recv().unwrap();
+ }
+ });
+
+ for i in 0..AMT {
+ select! {
+ i1 = rx1.recv() => { assert!(i % 2 == 0 && i == i1.unwrap()); },
+ i2 = rx2.recv() => { assert!(i % 2 == 1 && i == i2.unwrap()); }
+ }
+ tx3.send(()).unwrap();
+ }
+ t.join().unwrap();
+ }
+
+ #[allow(unused_must_use)]
+ #[test]
+ fn cloning() {
+ let (tx1, rx1) = channel::<i32>();
+ let (_tx2, rx2) = channel::<i32>();
+ let (tx3, rx3) = channel::<()>();
+
+ let t = thread::spawn(move || {
+ rx3.recv().unwrap();
+ tx1.clone();
+ assert_eq!(rx3.try_recv(), Err(TryRecvError::Empty));
+ tx1.send(2).unwrap();
+ rx3.recv().unwrap();
+ });
+
+ tx3.send(()).unwrap();
+ select! {
+ _i1 = rx1.recv() => {},
+ _i2 = rx2.recv() => panic!()
+ }
+ tx3.send(()).unwrap();
+ t.join().unwrap();
+ }
+
+ #[allow(unused_must_use)]
+ #[test]
+ fn cloning2() {
+ let (tx1, rx1) = channel::<i32>();
+ let (_tx2, rx2) = channel::<i32>();
+ let (tx3, rx3) = channel::<()>();
+
+ let t = thread::spawn(move || {
+ rx3.recv().unwrap();
+ tx1.clone();
+ assert_eq!(rx3.try_recv(), Err(TryRecvError::Empty));
+ tx1.send(2).unwrap();
+ rx3.recv().unwrap();
+ });
+
+ tx3.send(()).unwrap();
+ select! {
+ _i1 = rx1.recv() => {},
+ _i2 = rx2.recv() => panic!()
+ }
+ tx3.send(()).unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn cloning3() {
+ let (tx1, rx1) = channel::<()>();
+ let (tx2, rx2) = channel::<()>();
+ let (tx3, rx3) = channel::<()>();
+ let t = thread::spawn(move || {
+ select! {
+ _ = rx1.recv() => panic!(),
+ _ = rx2.recv() => {}
+ }
+ tx3.send(()).unwrap();
+ });
+
+ for _ in 0..1000 {
+ thread::yield_now();
+ }
+ drop(tx1.clone());
+ tx2.send(()).unwrap();
+ rx3.recv().unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn preflight1() {
+ let (tx, rx) = channel();
+ tx.send(()).unwrap();
+ select! {
+ _n = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn preflight2() {
+ let (tx, rx) = channel();
+ tx.send(()).unwrap();
+ tx.send(()).unwrap();
+ select! {
+ _n = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn preflight3() {
+ let (tx, rx) = channel();
+ drop(tx.clone());
+ tx.send(()).unwrap();
+ select! {
+ _n = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn preflight4() {
+ let (tx, rx) = channel();
+ tx.send(()).unwrap();
+ select! {
+ _ = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn preflight5() {
+ let (tx, rx) = channel();
+ tx.send(()).unwrap();
+ tx.send(()).unwrap();
+ select! {
+ _ = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn preflight6() {
+ let (tx, rx) = channel();
+ drop(tx.clone());
+ tx.send(()).unwrap();
+ select! {
+ _ = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn preflight7() {
+ let (tx, rx) = channel::<()>();
+ drop(tx);
+ select! {
+ _ = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn preflight8() {
+ let (tx, rx) = channel();
+ tx.send(()).unwrap();
+ drop(tx);
+ rx.recv().unwrap();
+ select! {
+ _ = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn preflight9() {
+ let (tx, rx) = channel();
+ drop(tx.clone());
+ tx.send(()).unwrap();
+ drop(tx);
+ rx.recv().unwrap();
+ select! {
+ _ = rx.recv() => {}
+ }
+ }
+
+ #[test]
+ fn oneshot_data_waiting() {
+ let (tx1, rx1) = channel();
+ let (tx2, rx2) = channel();
+ let t = thread::spawn(move || {
+ select! {
+ _n = rx1.recv() => {}
+ }
+ tx2.send(()).unwrap();
+ });
+
+ for _ in 0..100 {
+ thread::yield_now()
+ }
+ tx1.send(()).unwrap();
+ rx2.recv().unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn stream_data_waiting() {
+ let (tx1, rx1) = channel();
+ let (tx2, rx2) = channel();
+ tx1.send(()).unwrap();
+ tx1.send(()).unwrap();
+ rx1.recv().unwrap();
+ rx1.recv().unwrap();
+ let t = thread::spawn(move || {
+ select! {
+ _n = rx1.recv() => {}
+ }
+ tx2.send(()).unwrap();
+ });
+
+ for _ in 0..100 {
+ thread::yield_now()
+ }
+ tx1.send(()).unwrap();
+ rx2.recv().unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn shared_data_waiting() {
+ let (tx1, rx1) = channel();
+ let (tx2, rx2) = channel();
+ drop(tx1.clone());
+ tx1.send(()).unwrap();
+ rx1.recv().unwrap();
+ let t = thread::spawn(move || {
+ select! {
+ _n = rx1.recv() => {}
+ }
+ tx2.send(()).unwrap();
+ });
+
+ for _ in 0..100 {
+ thread::yield_now()
+ }
+ tx1.send(()).unwrap();
+ rx2.recv().unwrap();
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn sync1() {
+ let (tx, rx) = sync_channel::<i32>(1);
+ tx.send(1).unwrap();
+ select! {
+ n = rx.recv() => { assert_eq!(n.unwrap(), 1); }
+ }
+ }
+
+ #[test]
+ fn sync2() {
+ let (tx, rx) = sync_channel::<i32>(0);
+ let t = thread::spawn(move || {
+ for _ in 0..100 {
+ thread::yield_now()
+ }
+ tx.send(1).unwrap();
+ });
+ select! {
+ n = rx.recv() => { assert_eq!(n.unwrap(), 1); }
+ }
+ t.join().unwrap();
+ }
+
+ #[test]
+ fn sync3() {
+ let (tx1, rx1) = sync_channel::<i32>(0);
+ let (tx2, rx2): (Sender<i32>, Receiver<i32>) = channel();
+ let t = thread::spawn(move || {
+ tx1.send(1).unwrap();
+ });
+ let t2 = thread::spawn(move || {
+ tx2.send(2).unwrap();
+ });
+ select! {
+ n = rx1.recv() => {
+ let n = n.unwrap();
+ assert_eq!(n, 1);
+ assert_eq!(rx2.recv().unwrap(), 2);
+ },
+ n = rx2.recv() => {
+ let n = n.unwrap();
+ assert_eq!(n, 2);
+ assert_eq!(rx1.recv().unwrap(), 1);
+ }
+ }
+ t.join().unwrap();
+ t2.join().unwrap();
+ }
+}
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