tests/ui/lint/lint-invalid-atomic-ordering-exchange.rs

   1 // only-x86_64
   2 use std::sync::atomic::{AtomicUsize, Ordering};
   3
   4 fn main() {
   5     // `compare_exchange` (not weak) testing
   6     let x = AtomicUsize::new(0);
   7
   8     // Allowed ordering combos
   9     let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Relaxed);
  10     let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Acquire);
  11     let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::SeqCst);
  12     let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Relaxed);
  13     let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Acquire);
  14     let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::SeqCst);
  15     let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Relaxed);
  16     let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Acquire);
  17     let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::SeqCst);
  18     let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Relaxed);
  19     let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Acquire);
  20     let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::SeqCst);
  21     let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Relaxed);
  22     let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Acquire);
  23     let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::SeqCst);
  24
  25     // AcqRel is always forbidden as a failure ordering
  26     let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::AcqRel);
  27     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  28     let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::AcqRel);
  29     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  30     let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::AcqRel);
  31     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  32     let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::AcqRel);
  33     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  34     let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::AcqRel);
  35     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  36
  37     // Release is always forbidden as a failure ordering
  38     let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Release);
  39     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  40     let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Release);
  41     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  42     let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Release);
  43     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  44     let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Release);
  45     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  46     let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Release);
  47     //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
  48 }