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/*-------------------------------------------------------------------------
*
* generic-sunpro.h
* Atomic operations for solaris' CC
*
* Portions Copyright (c) 2013-2021, PostgreSQL Global Development Group
*
* NOTES:
*
* Documentation:
* * manpage for atomic_cas(3C)
* http://www.unix.com/man-page/opensolaris/3c/atomic_cas/
* http://docs.oracle.com/cd/E23824_01/html/821-1465/atomic-cas-3c.html
*
* src/include/port/atomics/generic-sunpro.h
*
* -------------------------------------------------------------------------
*/
#if defined(HAVE_ATOMICS)
#ifdef HAVE_MBARRIER_H
#include <mbarrier.h>
#define pg_compiler_barrier_impl() __compiler_barrier()
#ifndef pg_memory_barrier_impl
/*
* Despite the name this is actually a full barrier. Expanding to mfence/
* membar #StoreStore | #LoadStore | #StoreLoad | #LoadLoad on x86/sparc
* respectively.
*/
# define pg_memory_barrier_impl() __machine_rw_barrier()
#endif
#ifndef pg_read_barrier_impl
# define pg_read_barrier_impl() __machine_r_barrier()
#endif
#ifndef pg_write_barrier_impl
# define pg_write_barrier_impl() __machine_w_barrier()
#endif
#endif /* HAVE_MBARRIER_H */
/* Older versions of the compiler don't have atomic.h... */
#ifdef HAVE_ATOMIC_H
#include <atomic.h>
#define PG_HAVE_ATOMIC_U32_SUPPORT
typedef struct pg_atomic_uint32
{
volatile uint32 value;
} pg_atomic_uint32;
#define PG_HAVE_ATOMIC_U64_SUPPORT
typedef struct pg_atomic_uint64
{
/*
* Syntax to enforce variable alignment should be supported by versions
* supporting atomic.h, but it's hard to find accurate documentation. If
* it proves to be a problem, we'll have to add more version checks for 64
* bit support.
*/
volatile uint64 value pg_attribute_aligned(8);
} pg_atomic_uint64;
#endif /* HAVE_ATOMIC_H */
#endif /* defined(HAVE_ATOMICS) */
#if defined(HAVE_ATOMICS)
#ifdef HAVE_ATOMIC_H
#define PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U32
static inline bool
pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr,
uint32 *expected, uint32 newval)
{
bool ret;
uint32 current;
current = atomic_cas_32(&ptr->value, *expected, newval);
ret = current == *expected;
*expected = current;
return ret;
}
#define PG_HAVE_ATOMIC_COMPARE_EXCHANGE_U64
static inline bool
pg_atomic_compare_exchange_u64_impl(volatile pg_atomic_uint64 *ptr,
uint64 *expected, uint64 newval)
{
bool ret;
uint64 current;
current = atomic_cas_64(&ptr->value, *expected, newval);
ret = current == *expected;
*expected = current;
return ret;
}
#endif /* HAVE_ATOMIC_H */
#endif /* defined(HAVE_ATOMICS) */
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