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

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // run-pass
  12 #![feature(box_syntax)]
  13 #![feature(intrinsics)]
  14
  15 mod rusti {
  16     extern "rust-intrinsic" {
  17         pub fn atomic_cxchg<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  18         pub fn atomic_cxchg_acq<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  19         pub fn atomic_cxchg_rel<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  20
  21         pub fn atomic_cxchgweak<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  22         pub fn atomic_cxchgweak_acq<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  23         pub fn atomic_cxchgweak_rel<T>(dst: *mut T, old: T, src: T) -> (T, bool);
  24
  25         pub fn atomic_load<T>(src: *const T) -> T;
  26         pub fn atomic_load_acq<T>(src: *const T) -> T;
  27
  28         pub fn atomic_store<T>(dst: *mut T, val: T);
  29         pub fn atomic_store_rel<T>(dst: *mut T, val: T);
  30
  31         pub fn atomic_xchg<T>(dst: *mut T, src: T) -> T;
  32         pub fn atomic_xchg_acq<T>(dst: *mut T, src: T) -> T;
  33         pub fn atomic_xchg_rel<T>(dst: *mut T, src: T) -> T;
  34
  35         pub fn atomic_xadd<T>(dst: *mut T, src: T) -> T;
  36         pub fn atomic_xadd_acq<T>(dst: *mut T, src: T) -> T;
  37         pub fn atomic_xadd_rel<T>(dst: *mut T, src: T) -> T;
  38
  39         pub fn atomic_xsub<T>(dst: *mut T, src: T) -> T;
  40         pub fn atomic_xsub_acq<T>(dst: *mut T, src: T) -> T;
  41         pub fn atomic_xsub_rel<T>(dst: *mut T, src: T) -> T;
  42     }
  43 }
  44
  45 pub fn main() {
  46     unsafe {
  47         let mut x: Box<_> = box 1;
  48
  49         assert_eq!(rusti::atomic_load(&*x), 1);
  50         *x = 5;
  51         assert_eq!(rusti::atomic_load_acq(&*x), 5);
  52
  53         rusti::atomic_store(&mut *x,3);
  54         assert_eq!(*x, 3);
  55         rusti::atomic_store_rel(&mut *x,1);
  56         assert_eq!(*x, 1);
  57
  58         assert_eq!(rusti::atomic_cxchg(&mut *x, 1, 2), (1, true));
  59         assert_eq!(*x, 2);
  60
  61         assert_eq!(rusti::atomic_cxchg_acq(&mut *x, 1, 3), (2, false));
  62         assert_eq!(*x, 2);
  63
  64         assert_eq!(rusti::atomic_cxchg_rel(&mut *x, 2, 1), (2, true));
  65         assert_eq!(*x, 1);
  66
  67         assert_eq!(rusti::atomic_xchg(&mut *x, 0), 1);
  68         assert_eq!(*x, 0);
  69
  70         assert_eq!(rusti::atomic_xchg_acq(&mut *x, 1), 0);
  71         assert_eq!(*x, 1);
  72
  73         assert_eq!(rusti::atomic_xchg_rel(&mut *x, 0), 1);
  74         assert_eq!(*x, 0);
  75
  76         assert_eq!(rusti::atomic_xadd(&mut *x, 1), 0);
  77         assert_eq!(rusti::atomic_xadd_acq(&mut *x, 1), 1);
  78         assert_eq!(rusti::atomic_xadd_rel(&mut *x, 1), 2);
  79         assert_eq!(*x, 3);
  80
  81         assert_eq!(rusti::atomic_xsub(&mut *x, 1), 3);
  82         assert_eq!(rusti::atomic_xsub_acq(&mut *x, 1), 2);
  83         assert_eq!(rusti::atomic_xsub_rel(&mut *x, 1), 1);
  84         assert_eq!(*x, 0);
  85
  86         loop {
  87             let res = rusti::atomic_cxchgweak(&mut *x, 0, 1);
  88             assert_eq!(res.0, 0);
  89             if res.1 {
  90                 break;
  91             }
  92         }
  93         assert_eq!(*x, 1);
  94
  95         loop {
  96             let res = rusti::atomic_cxchgweak_acq(&mut *x, 1, 2);
  97             assert_eq!(res.0, 1);
  98             if res.1 {
  99                 break;
 100             }
 101         }
 102         assert_eq!(*x, 2);
 103
 104         loop {
 105             let res = rusti::atomic_cxchgweak_rel(&mut *x, 2, 3);
 106             assert_eq!(res.0, 2);
 107             if res.1 {
 108                 break;
 109             }
 110         }
 111         assert_eq!(*x, 3);
 112     }
 113 }