ATOMIC_ADD(3)

ATOMIC_ADD(3) | NetBSD Library Functions Manual | ATOMIC_ADD(3)

# 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.

April 11, 2007 | NetBSD 5.99