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Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
atomic_add, atomic_add_8, atomic_add_char, atomic_add_16, atomic_add_short, atomic_add_32, atomic_add_int, atomic_add_long, atomic_add_64, atomic_add_ptr, atomic_add_8_nv, atomic_add_char_nv, atomic_add_16_nv, atomic_add_short_nv, atomic_add_32_nv, atomic_add_int_nv, atomic_add_long_nv, atomic_add_64_nv, atomic_add_ptr_nv - atomic add operations

#include <sys/atomic.h>

void atomic_add_8(volatile uint8_t *target, int8_t delta);

void atomic_add_char(volatile uchar_t *target, signed char delta);

void atomic_add_16(volatile uint16_t *target, int16_t delta);

void atomic_add_short(volatile ushort_t *target, short delta);

void atomic_add_32(volatile uint32_t *target, int32_t delta);

void atomic_add_int(volatile uint_t *target, int delta);

void atomic_add_long(volatile ulong_t *target, long delta);

void atomic_add_64(volatile uint64_t *target, int64_t delta);

void atomic_add_ptr(volatile void *target, ssize_t delta);

uint8_t atomic_add_8_nv(volatile uint8_t *target, int8_t delta);

uchar_t atomic_add_char_nv(volatile uchar_t *target, signed char delta);

uint16_t atomic_add_16_nv(volatile uint16_t *target, int16_t delta);

ushort_t atomic_add_short_nv(volatile ushort_t *target, shortdelta);

uint32_t atomic_add_32_nv(volatile uint32_t *target, int32_t delta);

uint_t atomic_add_int_nv(volatile uint_t *target, int delta);

ulong_t atomic_add_long_nv(volatile ulong_t *target, long delta);

uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta);

void *atomic_add_ptr_nv(volatile void *target, ssize_t delta);

These functions enable the addition of delta to the value stored in target to occur in an atomic manner.

The *_nv() variants of these functions return the new value of target.

No errors are defined.

These functions can be called from user, interrupt, or kernel context.

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Committed

atomic_ops (3C), attributes (7), atomic_and (9F), atomic_bits (9F), atomic_cas (9F), atomic_dec (9F), atomic_inc (9F), atomic_or (9F), atomic_swap (9F), membar_ops (9F)

The *_nv() variants are substantially more expensive on some platforms than the versions that do not return values. Do not use them unless you need to know the new value atomically (for example, when decrementing a reference count and checking whether it went to zero).