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57 lines
2.0 KiB
Rust
57 lines
2.0 KiB
Rust
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// aux-build:custom.rs
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// aux-build:custom-as-global.rs
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// aux-build:helper.rs
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// no-prefer-dynamic
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#![feature(heap_api, allocator_api)]
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extern crate custom;
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extern crate custom_as_global;
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extern crate helper;
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use std::heap::{Heap, Alloc, System, Layout};
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use std::sync::atomic::{Ordering, ATOMIC_USIZE_INIT};
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static GLOBAL: custom::A = custom::A(ATOMIC_USIZE_INIT);
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fn main() {
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unsafe {
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let n = custom_as_global::get();
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let layout = Layout::from_size_align(4, 2).unwrap();
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// Global allocator routes to the `custom_as_global` global
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let ptr = Heap.alloc(layout.clone()).unwrap();
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helper::work_with(&ptr);
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assert_eq!(custom_as_global::get(), n + 1);
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Heap.dealloc(ptr, layout.clone());
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assert_eq!(custom_as_global::get(), n + 2);
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// Usage of the system allocator avoids all globals
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let ptr = System.alloc(layout.clone()).unwrap();
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helper::work_with(&ptr);
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assert_eq!(custom_as_global::get(), n + 2);
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System.dealloc(ptr, layout.clone());
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assert_eq!(custom_as_global::get(), n + 2);
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// Usage of our personal allocator doesn't affect other instances
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let ptr = (&GLOBAL).alloc(layout.clone()).unwrap();
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helper::work_with(&ptr);
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assert_eq!(custom_as_global::get(), n + 2);
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assert_eq!(GLOBAL.0.load(Ordering::SeqCst), 1);
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(&GLOBAL).dealloc(ptr, layout);
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assert_eq!(custom_as_global::get(), n + 2);
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assert_eq!(GLOBAL.0.load(Ordering::SeqCst), 2);
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}
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}
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