48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
//@ run-pass
|
|
|
|
//@ aux-build:custom.rs
|
|
//@ aux-build:custom-as-global.rs
|
|
//@ aux-build:helper.rs
|
|
//@ no-prefer-dynamic
|
|
|
|
#![feature(allocator_api)]
|
|
|
|
extern crate custom;
|
|
extern crate custom_as_global;
|
|
extern crate helper;
|
|
|
|
use std::alloc::{alloc, dealloc, GlobalAlloc, System, Layout};
|
|
use std::sync::atomic::{AtomicUsize, Ordering};
|
|
|
|
static GLOBAL: custom::A = custom::A(AtomicUsize::new(0));
|
|
|
|
fn main() {
|
|
unsafe {
|
|
let n = custom_as_global::get();
|
|
let layout = Layout::from_size_align(4, 2).unwrap();
|
|
|
|
// Global allocator routes to the `custom_as_global` global
|
|
let ptr = alloc(layout.clone());
|
|
helper::work_with(&ptr);
|
|
assert_eq!(custom_as_global::get(), n + 1);
|
|
dealloc(ptr, layout.clone());
|
|
assert_eq!(custom_as_global::get(), n + 2);
|
|
|
|
// Usage of the system allocator avoids all globals
|
|
let ptr = System.alloc(layout.clone());
|
|
helper::work_with(&ptr);
|
|
assert_eq!(custom_as_global::get(), n + 2);
|
|
System.dealloc(ptr, layout.clone());
|
|
assert_eq!(custom_as_global::get(), n + 2);
|
|
|
|
// Usage of our personal allocator doesn't affect other instances
|
|
let ptr = GLOBAL.alloc(layout.clone());
|
|
helper::work_with(&ptr);
|
|
assert_eq!(custom_as_global::get(), n + 2);
|
|
assert_eq!(GLOBAL.0.load(Ordering::SeqCst), 1);
|
|
GLOBAL.dealloc(ptr, layout);
|
|
assert_eq!(custom_as_global::get(), n + 2);
|
|
assert_eq!(GLOBAL.0.load(Ordering::SeqCst), 2);
|
|
}
|
|
}
|