minix/lib/nbsd_libc/atomic/atomic_or.3
Gianluca Guida b6cbf7203b Import unmodified NetBSD libc in trunk
This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.
2011-02-14 19:36:03 +00:00

95 lines
3.1 KiB
Groff

.\" $NetBSD: atomic_or.3,v 1.1 2008/06/23 10:22:40 ad Exp $
.\"
.\" Copyright (c) 2007 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd April 11, 2007
.Dt ATOMIC_OR 3
.Os
.Sh NAME
.Nm atomic_or ,
.Nm atomic_or_32 ,
.Nm atomic_or_uint ,
.Nm atomic_or_ulong ,
.Nm atomic_or_64 ,
.Nm atomic_or_32_nv ,
.Nm atomic_or_uint_nv ,
.Nm atomic_or_ulong_nv ,
.Nm atomic_or_64_nv
.Nd atomic logical
.Sq or
operations
.\" .Sh LIBRARY
.\" .Lb libc
.Sh SYNOPSIS
.In sys/atomic.h
.Ft void
.Fn atomic_or_32 "volatile uint32_t *ptr" "uint32_t bits"
.Ft void
.Fn atomic_or_uint "volatile unsigned int *ptr" "unsigned int bits"
.Ft void
.Fn atomic_or_ulong "volatile unsigned long *ptr" "unsigned long bits"
.Ft void
.Fn atomic_or_64 "volatile uint64_t *ptr" "uint64_t bits"
.Ft uint32_t
.Fn atomic_or_32_nv "volatile uint32_t *ptr" "uint32_t bits"
.Ft unsigned int
.Fn atomic_or_uint_nv "volatile unsigned int *ptr" "unsigned int bits"
.Ft unsigned long
.Fn atomic_or_ulong_nv "volatile unsigned long *ptr" "unsigned long bits"
.Ft uint64_t
.Fn atomic_or_64_nv "volatile uint64_t *ptr" "uint64_t bits"
.Sh DESCRIPTION
The
.Nm atomic_or
family of functions load the value of the variable referenced by
.Fa ptr ,
perform a logical
.Sq or
with the value
.Fa bits ,
and store the result back to the variable referenced by
.Fa ptr
in an atomic fashion.
.Pp
The
.Fn *_nv
variants of these functions return the new value.
.Pp
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
.Dv __HAVE_ATOMIC64_OPS
is defined.
.Sh SEE ALSO
.Xr atomic_ops 3
.Sh HISTORY
The
.Nm atomic_or
functions first appeared in
.Nx 5.0 .