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Change compare_exchange to return a Result<T, T> #32244

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Merged
merged 1 commit into from
Mar 19, 2016
Merged

Change compare_exchange to return a Result<T, T> #32244

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24 changes: 20 additions & 4 deletions src/libcore/intrinsics.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -53,19 +53,35 @@ extern "rust-intrinsic" {
// NB: These intrinsics take raw pointers because they mutate aliased
// memory, which is not valid for either `&` or `&mut`.

#[cfg(stage0)]
pub fn atomic_cxchg<T>(dst: *mut T, old: T, src: T) -> T;
#[cfg(stage0)]
pub fn atomic_cxchg_acq<T>(dst: *mut T, old: T, src: T) -> T;
#[cfg(stage0)]
pub fn atomic_cxchg_rel<T>(dst: *mut T, old: T, src: T) -> T;
#[cfg(stage0)]
pub fn atomic_cxchg_acqrel<T>(dst: *mut T, old: T, src: T) -> T;
#[cfg(stage0)]
pub fn atomic_cxchg_relaxed<T>(dst: *mut T, old: T, src: T) -> T;

#[cfg(not(stage0))]
pub fn atomic_cxchg<T>(dst: *mut T, old: T, src: T) -> (T, bool);
#[cfg(not(stage0))]
pub fn atomic_cxchg_acq<T>(dst: *mut T, old: T, src: T) -> (T, bool);
#[cfg(not(stage0))]
pub fn atomic_cxchg_rel<T>(dst: *mut T, old: T, src: T) -> (T, bool);
#[cfg(not(stage0))]
pub fn atomic_cxchg_acqrel<T>(dst: *mut T, old: T, src: T) -> (T, bool);
#[cfg(not(stage0))]
pub fn atomic_cxchg_relaxed<T>(dst: *mut T, old: T, src: T) -> (T, bool);
#[cfg(not(stage0))]
pub fn atomic_cxchg_failrelaxed<T>(dst: *mut T, old: T, src: T) -> T;
pub fn atomic_cxchg_failrelaxed<T>(dst: *mut T, old: T, src: T) -> (T, bool);
#[cfg(not(stage0))]
pub fn atomic_cxchg_failacq<T>(dst: *mut T, old: T, src: T) -> T;
pub fn atomic_cxchg_failacq<T>(dst: *mut T, old: T, src: T) -> (T, bool);
#[cfg(not(stage0))]
pub fn atomic_cxchg_acq_failrelaxed<T>(dst: *mut T, old: T, src: T) -> T;
pub fn atomic_cxchg_acq_failrelaxed<T>(dst: *mut T, old: T, src: T) -> (T, bool);
#[cfg(not(stage0))]
pub fn atomic_cxchg_acqrel_failrelaxed<T>(dst: *mut T, old: T, src: T) -> T;
pub fn atomic_cxchg_acqrel_failrelaxed<T>(dst: *mut T, old: T, src: T) -> (T, bool);

#[cfg(not(stage0))]
pub fn atomic_cxchgweak<T>(dst: *mut T, old: T, src: T) -> (T, bool);
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