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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));
    }

    // On Unix-like platforms, libc::abort will unregister signal handlers
    // including the SIGABRT handler, preventing the abort from being blocked, and
    // fclose streams, with the side effect of flushing them so libc bufferred
    // output will be printed.  Additionally the shell will generally print a more
    // understandable error message like "Abort trap" rather than "Illegal
    // instruction" that intrinsics::abort would cause, as intrinsics::abort is
    // implemented as an illegal instruction.
    #[cfg(unix)]
    unsafe fn abort_internal() -> ! {
        ::libc::abort()
    }

    // On Windows, use the processor-specific __fastfail mechanism.  In Windows 8
    // and later, this will terminate the process immediately without running any
    // in-process exception handlers.  In earlier versions of Windows, this
    // sequence of instructions will be treated as an access violation,
    // terminating the process but without necessarily bypassing all exception
    // handlers.
    //
    // https://msdn.microsoft.com/en-us/library/dn774154.aspx
    #[cfg(all(windows, any(target_arch = "x86", target_arch = "x86_64")))]
    unsafe fn abort_internal() -> ! {
        asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
        ::intrinsics::unreachable();
    }

    // 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 { 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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