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[atomic] Use CONSUME, not ACQUIRE, memory-order for get() 

Although, all implementations just elevate that to ACQUIRE.
But requirement for us is just CONSUME.
This commit is contained in:
Behdad Esfahbod 2018-07-31 19:33:37 -07:00
parent 06b91d935d
commit 3dd1b88765
1 changed files with 3 additions and 3 deletions
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6
src/hb-atomic-private.hh
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@ -46,14 +46,14 @@
/* Defined externally, i.e. in config.h; must have typedef'ed hb_atomic_int_impl_t as well. */ /* Defined externally, i.e. in config.h; must have typedef'ed hb_atomic_int_impl_t as well. */
#elif !defined(HB_NO_MT) && defined(__ATOMIC_ACQUIRE) #elif !defined(HB_NO_MT) && defined(__ATOMIC_CONSUME)
/* C++11-style GCC primitives. */ /* C++11-style GCC primitives. */
typedef int hb_atomic_int_impl_t; typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add (&(AI), (V), __ATOMIC_ACQ_REL) #define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add (&(AI), (V), __ATOMIC_ACQ_REL)
#define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_ACQUIRE) #define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_CONSUME)
static inline bool static inline bool
_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N) _hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
{ {
@ -71,7 +71,7 @@ _hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
typedef int hb_atomic_int_impl_t; typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<int> *> (&AI)->fetch_add ((V), std::memory_order_acq_rel)) #define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<int> *> (&AI)->fetch_add ((V), std::memory_order_acq_rel))
#define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_acquire)) #define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_consume))
static inline bool static inline bool
_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N) _hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
{ {