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
Theatomic_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
HISTORY
The atomic_or functions first appeared in
NetBSD 5.0.