diff options
Diffstat (limited to 'src/include/port/atomics/generic-gcc.h')
| -rw-r--r-- | src/include/port/atomics/generic-gcc.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/include/port/atomics/generic-gcc.h b/src/include/port/atomics/generic-gcc.h index da04e9f0dc3..de0e34cb60a 100644 --- a/src/include/port/atomics/generic-gcc.h +++ b/src/include/port/atomics/generic-gcc.h @@ -176,6 +176,23 @@ pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr, } #endif +/* + * __sync_lock_test_and_set() only supports setting the value to 1 on some + * platforms, so we only provide an __atomic implementation for + * pg_atomic_exchange. + * + * We assume the availability of 32-bit __atomic_compare_exchange_n() implies + * the availability of 32-bit __atomic_exchange_n(). + */ +#if !defined(PG_HAVE_ATOMIC_EXCHANGE_U32) && defined(HAVE_GCC__ATOMIC_INT32_CAS) +#define PG_HAVE_ATOMIC_EXCHANGE_U32 +static inline uint32 +pg_atomic_exchange_u32_impl(volatile pg_atomic_uint32 *ptr, uint32 newval) +{ + return __atomic_exchange_n(&ptr->value, newval, __ATOMIC_SEQ_CST); +} +#endif + /* if we have 32-bit __sync_val_compare_and_swap, assume we have these too: */ #if !defined(PG_HAVE_ATOMIC_FETCH_ADD_U32) && defined(HAVE_GCC__SYNC_INT32_CAS) @@ -243,6 +260,23 @@ pg_atomic_compare_exchange_u64_impl(volatile pg_atomic_uint64 *ptr, } #endif +/* + * __sync_lock_test_and_set() only supports setting the value to 1 on some + * platforms, so we only provide an __atomic implementation for + * pg_atomic_exchange. + * + * We assume the availability of 64-bit __atomic_compare_exchange_n() implies + * the availability of 64-bit __atomic_exchange_n(). + */ +#if !defined(PG_HAVE_ATOMIC_EXCHANGE_U64) && defined(HAVE_GCC__ATOMIC_INT64_CAS) +#define PG_HAVE_ATOMIC_EXCHANGE_U64 +static inline uint64 +pg_atomic_exchange_u64_impl(volatile pg_atomic_uint64 *ptr, uint64 newval) +{ + return __atomic_exchange_n(&ptr->value, newval, __ATOMIC_SEQ_CST); +} +#endif + /* if we have 64-bit __sync_val_compare_and_swap, assume we have these too: */ #if !defined(PG_HAVE_ATOMIC_FETCH_ADD_U64) && defined(HAVE_GCC__SYNC_INT64_CAS) |