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Revision 1.2, Sat Jun 16 08:11:32 2018 UTC (2 years, 3 months ago) by dholland
Branch: MAIN
CVS Tags: phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, netbsd-9-base, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, is-mlppp-base, is-mlppp, HEAD
Changes since 1.1: +3 -3 lines

atomic_and/atomic_or do bitwise ops, not logical ops.

.\"	$NetBSD: atomic_and.3,v 1.2 2018/06/16 08:11:32 dholland 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.
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.Dd April 11, 2007
.Dt ATOMIC_AND 3
.Os
.Sh NAME
.Nm atomic_and ,
.Nm atomic_and_32 ,
.Nm atomic_and_uint ,
.Nm atomic_and_ulong ,
.Nm atomic_and_64 ,
.Nm atomic_and_32_nv ,
.Nm atomic_and_uint_nv ,
.Nm atomic_and_ulong_nv ,
.Nm atomic_and_64_nv
.Nd atomic bitwise
.Sq and
operations
.\" .Sh LIBRARY
.\" .Lb libc
.Sh SYNOPSIS
.In sys/atomic.h
.Ft void
.Fn atomic_and_32 "volatile uint32_t *ptr" "uint32_t bits"
.Ft void
.Fn atomic_and_uint "volatile unsigned int *ptr" "unsigned int bits"
.Ft void
.Fn atomic_and_ulong "volatile unsigned long *ptr" "unsigned long bits"
.Ft void
.Fn atomic_and_64 "volatile uint64_t *ptr" "uint64_t bits"
.Ft uint32_t
.Fn atomic_and_32_nv "volatile uint32_t *ptr" "uint32_t bits"
.Ft unsigned int
.Fn atomic_and_uint_nv "volatile unsigned int *ptr" "unsigned int bits"
.Ft unsigned long
.Fn atomic_and_ulong_nv "volatile unsigned long *ptr" "unsigned long bits"
.Ft uint64_t
.Fn atomic_and_64_nv "volatile uint64_t *ptr" "uint64_t bits"
.Sh DESCRIPTION
The
.Nm atomic_and
family of functions load the value of the variable referenced by
.Fa ptr ,
perform a bitwise
.Sq and
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_and
functions first appeared in
.Nx 5.0 .