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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); }