Description
I was trying to troubleshoot this issue: jonhoo/bus#18 and eventually we figured out that on my machine park_timeout wasn't waking up. I wrote this simple test code which demonstrates the issue:
use std::thread;
use std::time::Duration;
fn main() {
let t1 = thread::spawn(|| {
let sleep = Duration::new(0,100_000);
for _ in 0..100 {
println!("Parking1");
thread::park_timeout(sleep);
}
});
let t2 = thread::spawn(|| {
let sleep = Duration::new(0,100_000);
for _ in 0..100 {
println!("Parking2");
thread::park_timeout(sleep);
}
});
t1.join().expect("Couldn't join thread 1");
t2.join().expect("Couldn't join thread 2");
}Most of the time it will only print this:
Parking1
Parking2
Every once in a while it will finish normally. This behavior happens on stable and nightly and I tried a handfull of stable versions all the way back to 1.12 and they all got stuck. Windows (both msvc and gnu appear to never get stuck (at least I couldn't reproduce the issue)). I was able to duplicate this an another mac as well (both running 10.14)
If only a single thread is started (or the park happens on the main thread) then I can't reproduce.
I'm on 10.14; uname: Darwin 34363bc7dc9c 18.2.0 Darwin Kernel Version 18.2.0: Thu Dec 20 20:46:53 PST 2018; root:xnu-4903.241.1~1/RELEASE_X86_64 x86_64 i386 MacBookPro11,3 Darwin
rustc 1.33.0 (2aa4c46cf 2019-02-28)
binary: rustc
commit-hash: 2aa4c46cfdd726e97360c2734835aa3515e8c858
commit-date: 2019-02-28
host: x86_64-apple-darwin
release: 1.33.0
LLVM version: 8.0