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Finish generic-xlc.h draft atomics implementation.

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Back-patch to 9.5, where commit b64d92f1a5
introduced this file.
This commit is contained in:
Noah Misch 2015-07-08 20:44:21 -04:00
parent aaf15ee33a
commit abf5190c07
1 changed files with 6 additions and 20 deletions
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26
src/include/port/atomics/generic-xlc.h
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@ -18,8 +18,6 @@
#if defined(HAVE_ATOMICS) #if defined(HAVE_ATOMICS)
#include <atomic.h>
#define PG_HAVE_ATOMIC_U32_SUPPORT #define PG_HAVE_ATOMIC_U32_SUPPORT
typedef struct pg_atomic_uint32 typedef struct pg_atomic_uint32
{ {
@ -48,9 +46,6 @@ static inline bool
pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr, pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr,
uint32 *expected, uint32 newval) uint32 *expected, uint32 newval)
{ {
bool ret;
uint64 current;
/* /*
* xlc's documentation tells us: * xlc's documentation tells us:
* "If __compare_and_swap is used as a locking primitive, insert a call to * "If __compare_and_swap is used as a locking primitive, insert a call to
@ -62,18 +57,15 @@ pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr,
* XXX: __compare_and_swap is defined to take signed parameters, but that * XXX: __compare_and_swap is defined to take signed parameters, but that
* shouldn't matter since we don't perform any arithmetic operations. * shouldn't matter since we don't perform any arithmetic operations.
*/ */
current = (uint32)__compare_and_swap((volatile int*)ptr->value, return __compare_and_swap((volatile int*)&ptr->value,
(int)*expected, (int)newval); (int *)expected, (int)newval);
ret = current == *expected;
*expected = current;
return ret;
} }
#define PG_HAVE_ATOMIC_FETCH_ADD_U32 #define PG_HAVE_ATOMIC_FETCH_ADD_U32
static inline uint32 static inline uint32
pg_atomic_fetch_add_u32_impl(volatile pg_atomic_uint32 *ptr, int32 add_) pg_atomic_fetch_add_u32_impl(volatile pg_atomic_uint32 *ptr, int32 add_)
{ {
return __fetch_and_add(&ptr->value, add_); return __fetch_and_add((volatile int *)&ptr->value, add_);
} }
#ifdef PG_HAVE_ATOMIC_U64_SUPPORT #ifdef PG_HAVE_ATOMIC_U64_SUPPORT
@ -83,23 +75,17 @@ static inline bool
pg_atomic_compare_exchange_u64_impl(volatile pg_atomic_uint64 *ptr, pg_atomic_compare_exchange_u64_impl(volatile pg_atomic_uint64 *ptr,
uint64 *expected, uint64 newval) uint64 *expected, uint64 newval)
{ {
bool ret;
uint64 current;
__isync(); __isync();
current = (uint64)__compare_and_swaplp((volatile long*)ptr->value, return __compare_and_swaplp((volatile long*)&ptr->value,
(long)*expected, (long)newval); (long *)expected, (long)newval);;
ret = current == *expected;
*expected = current;
return ret;
} }
#define PG_HAVE_ATOMIC_FETCH_ADD_U64 #define PG_HAVE_ATOMIC_FETCH_ADD_U64
static inline uint64 static inline uint64
pg_atomic_fetch_add_u64_impl(volatile pg_atomic_uint64 *ptr, int64 add_) pg_atomic_fetch_add_u64_impl(volatile pg_atomic_uint64 *ptr, int64 add_)
{ {
return __fetch_and_addlp(&ptr->value, add_); return __fetch_and_addlp((volatile long *)&ptr->value, add_);
} }
#endif /* PG_HAVE_ATOMIC_U64_SUPPORT */ #endif /* PG_HAVE_ATOMIC_U64_SUPPORT */