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MINOR: threads: Implement __ha_barrier_atomic*.

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Implement __ha_barrier functions to be used when trying to protect data
modified by atomic operations (except when using HA_ATOMIC_STORE).
On intel, atomic operations either use the LOCK prefix and xchg, and both
atc as full barrier, so there's no need to add an extra barrier.
This commit is contained in:
Olivier Houchard 2019-03-07 18:45:00 +01:00 committed by Olivier Houchard
parent a51885621d
commit 9abcf6ef9a
1 changed files with 78 additions and 0 deletions
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78
include/common/hathreads.h
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@ -128,6 +128,18 @@ static inline void ha_set_tid(unsigned int tid)
{
}
static inline void __ha_barrier_atomic_load(void)
{
}
static inline void __ha_barrier_atomic_store(void)
{
}
static inline void __ha_barrier_atomic_full(void)
{
}
static inline void __ha_barrier_load(void)
{
}
@ -866,6 +878,27 @@ __ha_cas_dw(void *target, void *compare, const void *set)
return (ret);
}
/* Use __ha_barrier_atomic* when you're trying to protect data that are
* are modified using HA_ATOMIC* (except HA_ATOMIC_STORE)
*/
static __inline void
__ha_barrier_atomic_load(void)
{
__asm __volatile("" ::: "memory");
}
static __inline void
__ha_barrier_atomic_store(void)
{
__asm __volatile("" ::: "memory");
}
static __inline void
__ha_barrier_atomic_full(void)
{
__asm __volatile("" ::: "memory");
}
static __inline void
__ha_barrier_load(void)
{
@ -886,6 +919,27 @@ __ha_barrier_full(void)
#elif defined(__arm__) && (defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__))
/* Use __ha_barrier_atomic* when you're trying to protect data that are
* are modified using HA_ATOMIC* (except HA_ATOMIC_STORE)
*/
static __inline void
__ha_barrier_atomic_load(void)
{
__asm __volatile("dmb" ::: "memory");
}
static __inline void
__ha_barrier_atomic_store(void)
{
__asm __volatile("dsb" ::: "memory");
}
static __inline void
__ha_barrier_atomic_full(void)
{
__asm __volatile("dmb" ::: "memory");
}
static __inline void
__ha_barrier_load(void)
{
@ -927,6 +981,27 @@ static __inline int __ha_cas_dw(void *target, void *compare, const void *set)
#elif defined (__aarch64__)
/* Use __ha_barrier_atomic* when you're trying to protect data that are
* are modified using HA_ATOMIC* (except HA_ATOMIC_STORE)
*/
static __inline void
__ha_barrier_atomic_load(void)
{
__asm __volatile("dmb ishld" ::: "memory");
}
static __inline void
__ha_barrier_atomic_store(void)
{
__asm __volatile("dmb ishst" ::: "memory");
}
static __inline void
__ha_barrier_atomic_full(void)
{
__asm __volatile("dmb ish" ::: "memory");
}
static __inline void
__ha_barrier_load(void)
{
@ -972,6 +1047,9 @@ static __inline int __ha_cas_dw(void *target, void *compare, void *set)
}
#else
#define __ha_barrier_atomic_load __sync_synchronize
#define __ha_barrier_atomic_store __sync_synchronize
#define __ha_barrier_atomic_full __sync_synchronize
#define __ha_barrier_load __sync_synchronize
#define __ha_barrier_store __sync_synchronize
#define __ha_barrier_full __sync_synchronize