rust/src/libstd/sys/common/util.rs
Alex Crichton f4be2026df std: Internalize almost all of std::rt
This commit does some refactoring to make almost all of the `std::rt` private.
Specifically, the following items are no longer part of its API:

* DEFAULT_ERROR_CODE
* backtrace
* unwind
* args
* at_exit
* cleanup
* heap (this is just alloc::heap)
* min_stack
* util

The module is now tagged as `#[doc(hidden)]` as the only purpose it's serve is
an entry point for the `panic!` macro via the `begin_unwind` and
`begin_unwind_fmt` reexports.
2015-09-11 11:19:20 -07:00

47 lines
1.5 KiB
Rust

// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use env;
use fmt;
use intrinsics;
use io::prelude::*;
use sync::atomic::{self, Ordering};
use sys::stdio::Stderr;
use thread;
pub fn min_stack() -> usize {
static MIN: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
match MIN.load(Ordering::SeqCst) {
0 => {}
n => return n - 1,
}
let amt = env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok());
let amt = amt.unwrap_or(2 * 1024 * 1024);
// 0 is our sentinel value, so ensure that we'll never see 0 after
// initialization has run
MIN.store(amt + 1, Ordering::SeqCst);
amt
}
pub fn dumb_print(args: fmt::Arguments) {
let _ = Stderr::new().map(|mut stderr| stderr.write_fmt(args));
}
pub fn abort(args: fmt::Arguments) -> ! {
dumb_print(format_args!("fatal runtime error: {}", args));
unsafe { intrinsics::abort(); }
}
#[allow(dead_code)] // stack overflow detection not enabled on all platforms
pub unsafe fn report_overflow() {
dumb_print(format_args!("\nthread '{}' has overflowed its stack",
thread::current().name().unwrap_or("<unknown>")));
}