atomic_or(3) - NetBSD Manual Pages

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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 refer-
     enced 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.

NetBSD 6.0                      April 11, 2007                      NetBSD 6.0