ATOMIC_OR(3)

NAME
atomic_or, atomic_or_32, atomic_or_uint, atomic_or_ulong, atomic_or_64, atomic_or_32_nv, atomic_or_uint_nv, atomic_or_ulong_nv, atomic_or_64_nv - atomic bitwise ‘or’ operations

SYNOPSIS
#include <sys/atomic.h>
void
atomic_or_32(volatile uint32_t *ptr, uint32_t bits);
void
atomic_or_uint(volatile unsigned int *ptr, unsigned int bits);
void
atomic_or_ulong(volatile unsigned long *ptr, unsigned long bits);
void
atomic_or_64(volatile uint64_t *ptr, uint64_t bits);
uint32_t
atomic_or_32_nv(volatile uint32_t *ptr, uint32_t bits);
unsigned int
atomic_or_uint_nv(volatile unsigned int *ptr, unsigned int bits);
unsigned long
atomic_or_ulong_nv(volatile unsigned long *ptr, unsigned long bits);
uint64_t
atomic_or_64_nv(volatile uint64_t *ptr, uint64_t bits);

DESCRIPTION
The atomic_or family of functions load the value of the variable referenced by ptr, perform a bitwise ‘or’ with the value bits, and store the result back 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_or functions first appeared in NetBSD 5.0.