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    // Copyright 2014-2015 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 core::sync::atomic::{AtomicPtr, Ordering};
    use core::mem;
    use core::intrinsics;

    static OOM_HANDLER: AtomicPtr<()> = AtomicPtr::new(default_oom_handler as *mut ());

    fn default_oom_handler() -> ! {
        // The default handler can't do much more since we can't assume the presence
        // of libc or any way of printing an error message.
        unsafe { intrinsics::abort() }
    }

    /// Common out-of-memory routine
    #[cold]
    #[inline(never)]
    #[unstable(feature = "oom", reason = "not a scrutinized interface",
               issue = "27700")]
    pub fn oom() -> ! {
        let value = OOM_HANDLER.load(Ordering::SeqCst);
        let handler: fn() -> ! = unsafe { mem::transmute(value) };
        handler();
    }

    /// Set a custom handler for out-of-memory conditions
    ///
    /// To avoid recursive OOM failures, it is critical that the OOM handler does
    /// not allocate any memory itself.
    #[unstable(feature = "oom", reason = "not a scrutinized interface",
               issue = "27700")]
    pub fn set_oom_handler(handler: fn() -> !) {
        OOM_HANDLER.store(handler as *mut (), Ordering::SeqCst);
    }

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