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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.

    #[cfg(target_has_atomic = "ptr")]
    pub use self::imp::set_oom_handler;
    use core::intrinsics;

    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() -> ! {
        self::imp::oom()
    }

    #[cfg(target_has_atomic = "ptr")]
    mod imp {
        use core::mem;
        use core::sync::atomic::{AtomicPtr, Ordering};

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

        #[inline(always)]
        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);
        }
    }

    #[cfg(not(target_has_atomic = "ptr"))]
    mod imp {
        #[inline(always)]
        pub fn oom() -> ! {
            super::default_oom_handler()
        }
    }

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