ATOMIC_OR(3) | NetBSD Library Functions Manual | 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 logical ‘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 logical ‘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.

April 11, 2007 | NetBSD 5.99