Code RoomReference escapes thread scope

HardPrep Room Coding #1808

Reference escapes thread scope

Code reviewConcurrencySenior–Staff~35 min

Review this Rust code that shares a slice with a scoped-looking thread.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix, specific and kind.

0:00 of about 35 min

Mark a line and say what kind of problem it is.0 findings

1use std::thread;

2

3fn process(data: &[u8]) -> u32 {

4 data.iter().map(|&b| b as u32).sum()

5}

6

7fn run() -> u32 {

8 let buf = vec![1u8, 2, 3, 4];

9 let r = &buf;

10 let handle = thread::spawn(move || process(r));

11 let total = handle.join().unwrap();

12 drop(buf);

13 total

14}

Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.