thread.rs - source
Description: Source of the Rust file `library/std/src/sys_common/thread.rs`.

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    use crate::env;
    use crate::sync::atomic::{self, Ordering};
    use crate::sys::thread as imp;

    pub fn min_stack() -> usize {
        static MIN: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
        match MIN.load(Ordering::Relaxed) {
            0 => {}
            n => return n - 1,
        }
        let amt = env::var_os("RUST_MIN_STACK").and_then(|s| s.to_str().and_then(|s| s.parse().ok()));
        let amt = amt.unwrap_or(imp::DEFAULT_MIN_STACK_SIZE);

        // 0 is our sentinel value, so ensure that we'll never see 0 after
        // initialization has run
        MIN.store(amt + 1, Ordering::Relaxed);
        amt
    }