//! ```
use core::atomic;
+use core::atomic::Ordering::{Relaxed, Release, Acquire, SeqCst};
use core::borrow::BorrowFrom;
use core::clone::Clone;
use core::fmt::{mod, Show};
#[experimental = "Weak pointers may not belong in this module."]
pub fn downgrade(&self) -> Weak<T> {
// See the clone() impl for why this is relaxed
- self.inner().weak.fetch_add(1, atomic::Relaxed);
+ self.inner().weak.fetch_add(1, Relaxed);
Weak { _ptr: self._ptr }
}
}
/// Get the number of weak references to this value.
#[inline]
#[experimental]
-pub fn weak_count<T>(this: &Arc<T>) -> uint { this.inner().weak.load(atomic::SeqCst) - 1 }
+pub fn weak_count<T>(this: &Arc<T>) -> uint { this.inner().weak.load(SeqCst) - 1 }
/// Get the number of strong references to this value.
#[inline]
#[experimental]
-pub fn strong_count<T>(this: &Arc<T>) -> uint { this.inner().strong.load(atomic::SeqCst) }
+pub fn strong_count<T>(this: &Arc<T>) -> uint { this.inner().strong.load(SeqCst) }
#[stable]
impl<T> Clone for Arc<T> {
// must already provide any required synchronization.
//
// [1]: (www.boost.org/doc/libs/1_55_0/doc/html/atomic/usage_examples.html)
- self.inner().strong.fetch_add(1, atomic::Relaxed);
+ self.inner().strong.fetch_add(1, Relaxed);
Arc { _ptr: self._ptr }
}
}
pub fn make_unique(&mut self) -> &mut T {
// Note that we hold a strong reference, which also counts as a weak reference, so we only
// clone if there is an additional reference of either kind.
- if self.inner().strong.load(atomic::SeqCst) != 1 ||
- self.inner().weak.load(atomic::SeqCst) != 1 {
+ if self.inner().strong.load(SeqCst) != 1 ||
+ self.inner().weak.load(SeqCst) != 1 {
*self = Arc::new((**self).clone())
}
// This unsafety is ok because we're guaranteed that the pointer returned is the *only*
// Because `fetch_sub` is already atomic, we do not need to synchronize with other threads
// unless we are going to delete the object. This same logic applies to the below
// `fetch_sub` to the `weak` count.
- if self.inner().strong.fetch_sub(1, atomic::Release) != 1 { return }
+ if self.inner().strong.fetch_sub(1, Release) != 1 { return }
// This fence is needed to prevent reordering of use of the data and deletion of the data.
// Because it is marked `Release`, the decreasing of the reference count synchronizes with
// > operation before deleting the object.
//
// [1]: (www.boost.org/doc/libs/1_55_0/doc/html/atomic/usage_examples.html)
- atomic::fence(atomic::Acquire);
+ atomic::fence(Acquire);
// Destroy the data at this time, even though we may not free the box allocation itself
// (there may still be weak pointers lying around).
unsafe { drop(ptr::read(&self.inner().data)); }
- if self.inner().weak.fetch_sub(1, atomic::Release) == 1 {
- atomic::fence(atomic::Acquire);
+ if self.inner().weak.fetch_sub(1, Release) == 1 {
+ atomic::fence(Acquire);
unsafe { deallocate(ptr as *mut u8, size_of::<ArcInner<T>>(),
min_align_of::<ArcInner<T>>()) }
}
// count hits 0 is must never be above 0.
let inner = self.inner();
loop {
- let n = inner.strong.load(atomic::SeqCst);
+ let n = inner.strong.load(SeqCst);
if n == 0 { return None }
- let old = inner.strong.compare_and_swap(n, n + 1, atomic::SeqCst);
+ let old = inner.strong.compare_and_swap(n, n + 1, SeqCst);
if old == n { return Some(Arc { _ptr: self._ptr }) }
}
}
#[inline]
fn clone(&self) -> Weak<T> {
// See comments in Arc::clone() for why this is relaxed
- self.inner().weak.fetch_add(1, atomic::Relaxed);
+ self.inner().weak.fetch_add(1, Relaxed);
Weak { _ptr: self._ptr }
}
}
// If we find out that we were the last weak pointer, then its time to deallocate the data
// entirely. See the discussion in Arc::drop() about the memory orderings
- if self.inner().weak.fetch_sub(1, atomic::Release) == 1 {
- atomic::fence(atomic::Acquire);
+ if self.inner().weak.fetch_sub(1, Release) == 1 {
+ atomic::fence(Acquire);
unsafe { deallocate(ptr as *mut u8, size_of::<ArcInner<T>>(),
min_align_of::<ArcInner<T>>()) }
}
unsafe {
match *self {
Canary(c) => {
- (*c).fetch_add(1, atomic::SeqCst);
+ (*c).fetch_add(1, SeqCst);
}
}
}
let mut canary = atomic::AtomicUint::new(0);
let x = Arc::new(Canary(&mut canary as *mut atomic::AtomicUint));
drop(x);
- assert!(canary.load(atomic::Acquire) == 1);
+ assert!(canary.load(Acquire) == 1);
}
#[test]
let mut canary = atomic::AtomicUint::new(0);
let arc = Arc::new(Canary(&mut canary as *mut atomic::AtomicUint));
let arc_weak = arc.downgrade();
- assert!(canary.load(atomic::Acquire) == 0);
+ assert!(canary.load(Acquire) == 0);
drop(arc);
- assert!(canary.load(atomic::Acquire) == 1);
+ assert!(canary.load(Acquire) == 1);
drop(arc_weak);
}