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use crate::scope;
use std::any::Any;
use std::sync::mpsc::channel;
use std::sync::Mutex;
use super::{spawn, spawn_fifo};
use crate::ThreadPoolBuilder;
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn spawn_then_join_in_worker() {
let (tx, rx) = channel();
scope(move |_| {
spawn(move || tx.send(22).unwrap());
});
assert_eq!(22, rx.recv().unwrap());
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn spawn_then_join_outside_worker() {
let (tx, rx) = channel();
spawn(move || tx.send(22).unwrap());
assert_eq!(22, rx.recv().unwrap());
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore)]
fn panic_fwd() {
let (tx, rx) = channel();
let tx = Mutex::new(tx);
let panic_handler = move |err: Box<dyn Any + Send>| {
let tx = tx.lock().unwrap();
if let Some(&msg) = err.downcast_ref::<&str>() {
if msg == "Hello, world!" {
tx.send(1).unwrap();
} else {
tx.send(2).unwrap();
}
} else {
tx.send(3).unwrap();
}
};
let builder = ThreadPoolBuilder::new().panic_handler(panic_handler);
builder
.build()
.unwrap()
.spawn(move || panic!("Hello, world!"));
assert_eq!(1, rx.recv().unwrap());
}
/// Test what happens when the thread-pool is dropped but there are
/// still active asynchronous tasks. We expect the thread-pool to stay
/// alive and executing until those threads are complete.
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn termination_while_things_are_executing() {
let (tx0, rx0) = channel();
let (tx1, rx1) = channel();
// Create a thread-pool and spawn some code in it, but then drop
// our reference to it.
{
let thread_pool = ThreadPoolBuilder::new().build().unwrap();
thread_pool.spawn(move || {
let data = rx0.recv().unwrap();
// At this point, we know the "main" reference to the
// `ThreadPool` has been dropped, but there are still
// active threads. Launch one more.
spawn(move || {
tx1.send(data).unwrap();
});
});
}
tx0.send(22).unwrap();
let v = rx1.recv().unwrap();
assert_eq!(v, 22);
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore)]
fn custom_panic_handler_and_spawn() {
let (tx, rx) = channel();
// Create a parallel closure that will send panics on the
// channel; since the closure is potentially executed in parallel
// with itself, we have to wrap `tx` in a mutex.
let tx = Mutex::new(tx);
let panic_handler = move |e: Box<dyn Any + Send>| {
tx.lock().unwrap().send(e).unwrap();
};
// Execute an async that will panic.
let builder = ThreadPoolBuilder::new().panic_handler(panic_handler);
builder.build().unwrap().spawn(move || {
panic!("Hello, world!");
});
// Check that we got back the panic we expected.
let error = rx.recv().unwrap();
if let Some(&msg) = error.downcast_ref::<&str>() {
assert_eq!(msg, "Hello, world!");
} else {
panic!("did not receive a string from panic handler");
}
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore)]
fn custom_panic_handler_and_nested_spawn() {
let (tx, rx) = channel();
// Create a parallel closure that will send panics on the
// channel; since the closure is potentially executed in parallel
// with itself, we have to wrap `tx` in a mutex.
let tx = Mutex::new(tx);
let panic_handler = move |e| {
tx.lock().unwrap().send(e).unwrap();
};
// Execute an async that will (eventually) panic.
const PANICS: usize = 3;
let builder = ThreadPoolBuilder::new().panic_handler(panic_handler);
builder.build().unwrap().spawn(move || {
// launch 3 nested spawn-asyncs; these should be in the same
// thread-pool and hence inherit the same panic handler
for _ in 0..PANICS {
spawn(move || {
panic!("Hello, world!");
});
}
});
// Check that we get back the panics we expected.
for _ in 0..PANICS {
let error = rx.recv().unwrap();
if let Some(&msg) = error.downcast_ref::<&str>() {
assert_eq!(msg, "Hello, world!");
} else {
panic!("did not receive a string from panic handler");
}
}
}
macro_rules! test_order {
($outer_spawn:ident, $inner_spawn:ident) => {{
let builder = ThreadPoolBuilder::new().num_threads(1);
let pool = builder.build().unwrap();
let (tx, rx) = channel();
pool.install(move || {
for i in 0..10 {
let tx = tx.clone();
$outer_spawn(move || {
for j in 0..10 {
let tx = tx.clone();
$inner_spawn(move || {
tx.send(i * 10 + j).unwrap();
});
}
});
}
});
rx.iter().collect::<Vec<i32>>()
}};
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn lifo_order() {
// In the absence of stealing, `spawn()` jobs on a thread will run in LIFO order.
let vec = test_order!(spawn, spawn);
let expected: Vec<i32> = (0..100).rev().collect(); // LIFO -> reversed
assert_eq!(vec, expected);
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn fifo_order() {
// In the absence of stealing, `spawn_fifo()` jobs on a thread will run in FIFO order.
let vec = test_order!(spawn_fifo, spawn_fifo);
let expected: Vec<i32> = (0..100).collect(); // FIFO -> natural order
assert_eq!(vec, expected);
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn lifo_fifo_order() {
// LIFO on the outside, FIFO on the inside
let vec = test_order!(spawn, spawn_fifo);
let expected: Vec<i32> = (0..10)
.rev()
.flat_map(|i| (0..10).map(move |j| i * 10 + j))
.collect();
assert_eq!(vec, expected);
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn fifo_lifo_order() {
// FIFO on the outside, LIFO on the inside
let vec = test_order!(spawn_fifo, spawn);
let expected: Vec<i32> = (0..10)
.flat_map(|i| (0..10).rev().map(move |j| i * 10 + j))
.collect();
assert_eq!(vec, expected);
}
macro_rules! spawn_send {
($spawn:ident, $tx:ident, $i:expr) => {{
let tx = $tx.clone();
$spawn(move || tx.send($i).unwrap());
}};
}
/// Test mixed spawns pushing a series of numbers, interleaved such
/// such that negative values are using the second kind of spawn.
macro_rules! test_mixed_order {
($pos_spawn:ident, $neg_spawn:ident) => {{
let builder = ThreadPoolBuilder::new().num_threads(1);
let pool = builder.build().unwrap();
let (tx, rx) = channel();
pool.install(move || {
spawn_send!($pos_spawn, tx, 0);
spawn_send!($neg_spawn, tx, -1);
spawn_send!($pos_spawn, tx, 1);
spawn_send!($neg_spawn, tx, -2);
spawn_send!($pos_spawn, tx, 2);
spawn_send!($neg_spawn, tx, -3);
spawn_send!($pos_spawn, tx, 3);
});
rx.iter().collect::<Vec<i32>>()
}};
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn mixed_lifo_fifo_order() {
let vec = test_mixed_order!(spawn, spawn_fifo);
let expected = vec![3, -1, 2, -2, 1, -3, 0];
assert_eq!(vec, expected);
}
#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn mixed_fifo_lifo_order() {
let vec = test_mixed_order!(spawn_fifo, spawn);
let expected = vec![0, -3, 1, -2, 2, -1, 3];
assert_eq!(vec, expected);
}