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 vari-
     able 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.

NetBSD 5.0_STABLE               April 11, 2007               NetBSD 5.0_STABLE
