windows-threading lifetime soundness issue #3695
Description
Summary
After looking into #3694, I was confused how the windows_threading::Pool example worked vs (scoped) threads without unsafe. I suspected there may be a lifetime bug in pool.submit and i was able to get a segfault when executing an example.
PS C:\Users\prussian\source\example-winthread> cargo run
Compiling example-winsvc v0.1.0 (C:\Users\prussian\source\example-winthread)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.24s
Running `target\debug\example-winthread.exe`
error: process didn't exit successfully: `target\debug\example-winthread.exe` (exit code: 0xc0000005, STATUS_ACCESS_VIOLATION)
see example code below.
Crate manifest
[package]
name = "example-winthread"
version = "0.1.0"
edition = "2024"
[dependencies]
windows-threading = "0.1"Crate code
fn main() {
use windows_threading::Pool;
let pool = Pool::new();
pool.set_thread_limits(1, 2);
pool.submit(|| {
let s = "Hello, world!";
pool.submit(|| println!("{s}"));
});
pool.join();
}