29 lines
906 B
Rust
29 lines
906 B
Rust
use crate::env;
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use crate::sync::atomic::{self, Ordering};
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use crate::sys::stack_overflow;
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use crate::sys::thread as imp;
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#[allow(dead_code)]
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pub unsafe fn start_thread(main: *mut u8) {
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// Next, set up our stack overflow handler which may get triggered if we run
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// out of stack.
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let _handler = stack_overflow::Handler::new();
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// Finally, let's run some code.
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Box::from_raw(main as *mut Box<dyn FnOnce()>)()
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}
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pub fn min_stack() -> usize {
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static MIN: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
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match MIN.load(Ordering::SeqCst) {
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0 => {}
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n => return n - 1,
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}
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let amt = env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok());
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let amt = amt.unwrap_or(imp::DEFAULT_MIN_STACK_SIZE);
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// 0 is our sentinel value, so ensure that we'll never see 0 after
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// initialization has run
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MIN.store(amt + 1, Ordering::SeqCst);
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amt
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}
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