In Rust, a panic terminates the current thread but is not sent back to the main thread. The solution we are told is to use join
. However, this blocks the currently executing thread. So if my main thread spawns 2 threads, I cannot join both of them and immediately get a panic back.
let jh1 = thread::spawn(|| { println!("thread 1"); sleep(1000000); };
let jh2 = thread::spawn(|| { panic!("thread 2") };
In the above, if I join on thread 1 and then on thread 2 I will be waiting for 1 before ever receiving a panic from either thread
Although in some cases I desire the current behavior, my goal is to default to Go's behavior where I can spawn a thread and have it panic on that thread and then immediately end the main thread. (The Go specification also documents a protect
function, so it is easy to achieve Rust behavior in Go).