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/*-------------------------------------------------------------------------
*
* generic-xlc.h
* Atomic operations for IBM's CC
*
* Portions Copyright (c) 2013-2015, PostgreSQL Global Development Group
*
* NOTES:
*
* Documentation:
* * Synchronization and atomic built-in functions
* http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/topic/com.ibm.xlcpp8l.doc/compiler/ref/bif_sync.htm
*
* src/include/port/atomics/generic-xlc.h
*
* -------------------------------------------------------------------------
*/
#if defined(HAVE_ATOMICS)
#include <atomic.h>
#define PG_HAVE_ATOMIC_U32_SUPPORT
typedef struct pg_atomic_uint32
{
volatile uint32 value;
} pg_atomic_uint32;
/* 64bit atomics are only supported in 64bit mode */
#ifdef __64BIT__
#define PG_HAVE_ATOMIC_U64_SUPPORT
typedef struct pg_atomic_uint64
{
volatile uint64 value __attribute__((__aligned__(8)));
} pg_atomic_uint64;
#endif /* __64BIT__ */
#endif /* defined(HAVE_ATOMICS) */
#if defined(PG_USE_INLINE) || defined(ATOMICS_INCLUDE_DEFINITIONS)
#if defined(HAVE_ATOMICS)
#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;
uint64 current;
/*
* xlc's documentation tells us:
* "If __compare_and_swap is used as a locking primitive, insert a call to
* the __isync built-in function at the start of any critical sections."
*/
__isync();
/*
* XXX: __compare_and_swap is defined to take signed parameters, but that
* shouldn't matter since we don't perform any arithmetic operations.
*/
current = (uint32)__compare_and_swap((volatile int*)ptr->value,
(int)*expected, (int)newval);
ret = current == *expected;
*expected = current;
return ret;
}
#define PG_HAVE_ATOMIC_FETCH_ADD_U32
static inline uint32
pg_atomic_fetch_add_u32_impl(volatile pg_atomic_uint32 *ptr, int32 add_)
{
return __fetch_and_add(&ptr->value, add_);
}
#ifdef PG_HAVE_ATOMIC_U64_SUPPORT
#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;
__isync();
current = (uint64)__compare_and_swaplp((volatile long*)ptr->value,
(long)*expected, (long)newval);
ret = current == *expected;
*expected = current;
return ret;
}
#define PG_HAVE_ATOMIC_FETCH_ADD_U64
static inline uint64
pg_atomic_fetch_add_u64_impl(volatile pg_atomic_uint64 *ptr, int64 add_)
{
return __fetch_and_addlp(&ptr->value, add_);
}
#endif /* PG_HAVE_ATOMIC_U64_SUPPORT */
#endif /* defined(HAVE_ATOMICS) */
#endif /* defined(PG_USE_INLINE) || defined(ATOMICS_INCLUDE_DEFINITIONS) */
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