\"      $NetBSD: atomic_and.3,v 1.2 2018/06/16 08:11:32 dholland Exp $
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\" Copyright (c) 2007 The NetBSD Foundation, Inc.
\" All rights reserved.
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\" 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 .

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