2 use crate::sync::atomic::{self, Ordering};
3 use crate::sys::stack_overflow;
4 use crate::sys::thread as imp;
7 pub unsafe fn start_thread(main: *mut u8) {
8 // Next, set up our stack overflow handler which may get triggered if we run
10 let _handler = stack_overflow::Handler::new();
12 // Finally, let's run some code.
13 Box::from_raw(main as *mut Box<dyn FnOnce()>)()
16 pub fn min_stack() -> usize {
17 static MIN: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
18 match MIN.load(Ordering::SeqCst) {
22 let amt = env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok());
23 let amt = amt.unwrap_or(imp::DEFAULT_MIN_STACK_SIZE);
25 // 0 is our sentinel value, so ensure that we'll never see 0 after
26 // initialization has run
27 MIN.store(amt + 1, Ordering::SeqCst);