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    // 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 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));
    }

    // Other platforms should use the appropriate platform-specific mechanism for
    // aborting the process.  If no platform-specific mechanism is available,
    // ::intrinsics::abort() may be used instead.  The above implementations cover
    // all targets currently supported by libstd.

    pub fn abort(args: fmt::Arguments) -> ! {
        dumb_print(format_args!("fatal runtime error: {}\n", args));
        unsafe { ::sys::abort_internal(); }
    }

    #[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\n",
                                thread::current().name().unwrap_or("<unknown>")));
    }

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