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.\" $OpenBSD: atomic_setbits_int.9,v 1.3 2014/02/13 14:25:21 jmc Exp $
.\"
.\" Copyright (c) 2007 Artur Grabowski <art@openbsd.org>
.\" All rights reserved.
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.Dd $Mdocdate: February 13 2014 $
.Dt ATOMIC_SETBITS_INT 9
.Os
.Sh NAME
.Nm atomic_setbits_int ,
.Nm atomic_clearbits_int
.Nd interface to perform atomic operations on data
.Sh SYNOPSIS
.In sys/atomic.h
.Ft void
.Fn atomic_setbits_int "unsigned int *p" "unsigned int b"
.Ft void
.Fn atomic_clearbits_int "unsigned int *p" "unsigned int b"
.Sh DESCRIPTION
The atomic bits set of functions provide an interface for changing data atomically with respect to interrupts and multiple processors in the system.
.Pp
The
.Fn atomic_setbits_int
function sets the bits in
.Fa b
in the integer pointed to by
.Fa p .
It is equivalent to
.Bd -literal -offset indent
*p |= b;
.Ed
.Pp
The
.Fn atomic_clearbits_int
function clears the bits in
.Fa b
in the integer pointed to by
.Fa p .
It is equivalent to
.Bd -literal -offset indent
*p &= ~b;
.Ed
.Sh CONTEXT
.Fn atomic_setbits_int ,
and
.Fn atomic_clearbits_int
can be called during autoconf, from process context, or from interrupt context.
.Sh SEE ALSO
.Xr atomic_add_int 9 ,
.Xr atomic_cas_uint 9 ,
.Xr atomic_dec_int 9 ,
.Xr atomic_inc_int 9 ,
.Xr atomic_sub_int 9 ,
.Xr atomic_swap_uint 9
.Sh HISTORY
The
.Nm
functions first appeared in
.Ox 4.1 .