ATOMIC_OR(3) | 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 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.

April 11, 2007 | NetBSD 9.1