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Document unstable::atomics fetch_* return values

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This commit is contained in:
Ben Blum 2013-06-10 22:13:17 -04:00
parent d809f54a7c
commit 0ca2056e46
1 changed files with 6 additions and 0 deletions
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6
src/libstd/unstable/atomics.rs
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@ -155,11 +155,13 @@ impl AtomicInt {
unsafe { atomic_compare_and_swap(&mut self.v, old, new, order) }
}
/// Returns the old value (like __sync_fetch_and_add).
#[inline(always)]
pub fn fetch_add(&mut self, val: int, order: Ordering) -> int {
unsafe { atomic_add(&mut self.v, val, order) }
}
/// Returns the old value (like __sync_fetch_and_sub).
#[inline(always)]
pub fn fetch_sub(&mut self, val: int, order: Ordering) -> int {
unsafe { atomic_sub(&mut self.v, val, order) }
@ -191,11 +193,13 @@ impl AtomicUint {
unsafe { atomic_compare_and_swap(&mut self.v, old, new, order) }
}
/// Returns the old value (like __sync_fetch_and_add).
#[inline(always)]
pub fn fetch_add(&mut self, val: uint, order: Ordering) -> uint {
unsafe { atomic_add(&mut self.v, val, order) }
}
/// Returns the old value (like __sync_fetch_and_sub)..
#[inline(always)]
pub fn fetch_sub(&mut self, val: uint, order: Ordering) -> uint {
unsafe { atomic_sub(&mut self.v, val, order) }
@ -315,6 +319,7 @@ pub unsafe fn atomic_swap<T>(dst: &mut T, val: T, order: Ordering) -> T {
})
}
/// Returns the old value (like __sync_fetch_and_add).
#[inline(always)]
pub unsafe fn atomic_add<T>(dst: &mut T, val: T, order: Ordering) -> T {
let dst = cast::transmute(dst);
@ -327,6 +332,7 @@ pub unsafe fn atomic_add<T>(dst: &mut T, val: T, order: Ordering) -> T {
})
}
/// Returns the old value (like __sync_fetch_and_sub).
#[inline(always)]
pub unsafe fn atomic_sub<T>(dst: &mut T, val: T, order: Ordering) -> T {
let dst = cast::transmute(dst);