NAME
atomic_add,
atomic_add_32,
atomic_add_int,
atomic_add_long,
atomic_add_ptr,
atomic_add_64,
atomic_add_32_nv,
atomic_add_int_nv,
atomic_add_long_nv,
atomic_add_ptr_nv,
atomic_add_64_nv —
atomic add
operations
SYNOPSIS
#include <sys/atomic.h>
void
atomic_add_32(
volatile
uint32_t *ptr,
int32_t
delta);
void
atomic_add_int(
volatile
unsigned int *ptr,
int
delta);
void
atomic_add_long(
volatile
unsigned long *ptr,
long
delta);
void
atomic_add_ptr(
volatile
void *ptr,
ssize_t
delta);
void
atomic_add_64(
volatile
uint64_t *ptr,
int64_t
delta);
uint32_t
atomic_add_32_nv(
volatile
uint32_t *ptr,
int32_t
delta);
unsigned int
atomic_add_int_nv(
volatile
unsigned int *ptr,
int
delta);
unsigned long
atomic_add_long_nv(
volatile
unsigned long *ptr,
long
delta);
void *
atomic_add_ptr_nv(
volatile
void *ptr,
ssize_t
delta);
uint64_t
atomic_add_64_nv(
volatile
uint64_t *ptr,
int64_t
delta);
DESCRIPTION
The
atomic_add family of functions add a signed value
delta to the variable referenced by
ptr in an atomic fashion.
The
*_nv() variants of these functions return the new value.
The 64-bit variants of these functions are available only on platforms that can
support atomic 64-bit memory access. Applications can check for the
availability of 64-bit atomic memory operations by testing if the
pre-processor macro
__HAVE_ATOMIC64_OPS
is defined.
SEE ALSO
atomic_ops(3)
HISTORY
The
atomic_add functions first appeared in
NetBSD 5.0.