src/test/ui/intrinsics/intrinsic-atomics.rs

   1 // run-pass
   2 #![feature(intrinsics)]
   3
   4 mod rusti {
   5     extern "rust-intrinsic" {
   6         pub fn atomic_cxchg<T>(dst: *mut T, old: T, src: T) -> (T, bool);
   7         pub fn atomic_cxchg_acq<T>(dst: *mut T, old: T, src: T) -> (T, bool);
   8         pub fn atomic_cxchg_rel<T>(dst: *mut T, old: T, src: T) -> (T, bool);
   9
  10         pub fn atomic_cxchgweak<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  11         pub fn atomic_cxchgweak_acq<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  12         pub fn atomic_cxchgweak_rel<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  13
  14         pub fn atomic_load<T>(src: *const T) -> T;
  15         pub fn atomic_load_acq<T>(src: *const T) -> T;
  16
  17         pub fn atomic_store<T>(dst: *mut T, val: T);
  18         pub fn atomic_store_rel<T>(dst: *mut T, val: T);
  19
  20         pub fn atomic_xchg<T>(dst: *mut T, src: T) -> T;
  21         pub fn atomic_xchg_acq<T>(dst: *mut T, src: T) -> T;
  22         pub fn atomic_xchg_rel<T>(dst: *mut T, src: T) -> T;
  23
  24         pub fn atomic_xadd<T>(dst: *mut T, src: T) -> T;
  25         pub fn atomic_xadd_acq<T>(dst: *mut T, src: T) -> T;
  26         pub fn atomic_xadd_rel<T>(dst: *mut T, src: T) -> T;
  27
  28         pub fn atomic_xsub<T>(dst: *mut T, src: T) -> T;
  29         pub fn atomic_xsub_acq<T>(dst: *mut T, src: T) -> T;
  30         pub fn atomic_xsub_rel<T>(dst: *mut T, src: T) -> T;
  31     }
  32 }
  33
  34 pub fn main() {
  35     unsafe {
  36         let mut x: Box<_> = Box::new(1);
  37
  38         assert_eq!(rusti::atomic_load(&*x), 1);
  39         *x = 5;
  40         assert_eq!(rusti::atomic_load_acq(&*x), 5);
  41
  42         rusti::atomic_store(&mut *x,3);
  43         assert_eq!(*x, 3);
  44         rusti::atomic_store_rel(&mut *x,1);
  45         assert_eq!(*x, 1);
  46
  47         assert_eq!(rusti::atomic_cxchg(&mut *x, 1, 2), (1, true));
  48         assert_eq!(*x, 2);
  49
  50         assert_eq!(rusti::atomic_cxchg_acq(&mut *x, 1, 3), (2, false));
  51         assert_eq!(*x, 2);
  52
  53         assert_eq!(rusti::atomic_cxchg_rel(&mut *x, 2, 1), (2, true));
  54         assert_eq!(*x, 1);
  55
  56         assert_eq!(rusti::atomic_xchg(&mut *x, 0), 1);
  57         assert_eq!(*x, 0);
  58
  59         assert_eq!(rusti::atomic_xchg_acq(&mut *x, 1), 0);
  60         assert_eq!(*x, 1);
  61
  62         assert_eq!(rusti::atomic_xchg_rel(&mut *x, 0), 1);
  63         assert_eq!(*x, 0);
  64
  65         assert_eq!(rusti::atomic_xadd(&mut *x, 1), 0);
  66         assert_eq!(rusti::atomic_xadd_acq(&mut *x, 1), 1);
  67         assert_eq!(rusti::atomic_xadd_rel(&mut *x, 1), 2);
  68         assert_eq!(*x, 3);
  69
  70         assert_eq!(rusti::atomic_xsub(&mut *x, 1), 3);
  71         assert_eq!(rusti::atomic_xsub_acq(&mut *x, 1), 2);
  72         assert_eq!(rusti::atomic_xsub_rel(&mut *x, 1), 1);
  73         assert_eq!(*x, 0);
  74
  75         loop {
  76             let res = rusti::atomic_cxchgweak(&mut *x, 0, 1);
  77             assert_eq!(res.0, 0);
  78             if res.1 {
  79                 break;
  80             }
  81         }
  82         assert_eq!(*x, 1);
  83
  84         loop {
  85             let res = rusti::atomic_cxchgweak_acq(&mut *x, 1, 2);
  86             assert_eq!(res.0, 1);
  87             if res.1 {
  88                 break;
  89             }
  90         }
  91         assert_eq!(*x, 2);
  92
  93         loop {
  94             let res = rusti::atomic_cxchgweak_rel(&mut *x, 2, 3);
  95             assert_eq!(res.0, 2);
  96             if res.1 {
  97                 break;
  98             }
  99         }
 100         assert_eq!(*x, 3);
 101     }
 102 }