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48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
//@ run-pass
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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(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::alloc::{alloc, dealloc, GlobalAlloc, System, Layout};
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use std::sync::atomic::{AtomicUsize, Ordering};
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static GLOBAL: custom::A = custom::A(AtomicUsize::new(0));
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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 = alloc(layout.clone());
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helper::work_with(&ptr);
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assert_eq!(custom_as_global::get(), n + 1);
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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());
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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());
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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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