1.\" $OpenBSD: atomic_setbits_int.9,v 1.3 2014/02/13 14:25:21 jmc Exp $ 2.\" 3.\" Copyright (c) 2007 Artur Grabowski <art@openbsd.org> 4.\" All rights reserved. 5.\" 6.\" Permission to use, copy, modify, and distribute this software for any 7.\" purpose with or without fee is hereby granted, provided that the above 8.\" copyright notice and this permission notice appear in all copies. 9.\" 10.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17.\" 18.Dd $Mdocdate: February 13 2014 $ 19.Dt ATOMIC_SETBITS_INT 9 20.Os 21.Sh NAME 22.Nm atomic_setbits_int , 23.Nm atomic_clearbits_int 24.Nd interface to perform atomic operations on data 25.Sh SYNOPSIS 26.In sys/atomic.h 27.Ft void 28.Fn atomic_setbits_int "unsigned int *p" "unsigned int b" 29.Ft void 30.Fn atomic_clearbits_int "unsigned int *p" "unsigned int b" 31.Sh DESCRIPTION 32The atomic bits set of functions provide an interface for changing data atomically with respect to interrupts and multiple processors in the system. 33.Pp 34The 35.Fn atomic_setbits_int 36function sets the bits in 37.Fa b 38in the integer pointed to by 39.Fa p . 40It is equivalent to 41.Bd -literal -offset indent 42*p |= b; 43.Ed 44.Pp 45The 46.Fn atomic_clearbits_int 47function clears the bits in 48.Fa b 49in the integer pointed to by 50.Fa p . 51It is equivalent to 52.Bd -literal -offset indent 53*p &= ~b; 54.Ed 55.Sh CONTEXT 56.Fn atomic_setbits_int , 57and 58.Fn atomic_clearbits_int 59can be called during autoconf, from process context, or from interrupt context. 60.Sh SEE ALSO 61.Xr atomic_add_int 9 , 62.Xr atomic_cas_uint 9 , 63.Xr atomic_dec_int 9 , 64.Xr atomic_inc_int 9 , 65.Xr atomic_sub_int 9 , 66.Xr atomic_swap_uint 9 67.Sh HISTORY 68The 69.Nm 70functions first appeared in 71.Ox 4.1 . 72