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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.

NetBSD 10.99                    April 11, 2007                    NetBSD 10.99