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Annotation of src/lib/libc/atomic/atomic_or.3, Revision 1.1.62.1

1.1.62.1! pgoyette    1: .\"    $NetBSD: atomic_or.3,v 1.2 2018/06/16 08:11:32 dholland Exp $
1.1       ad          2: .\"
                      3: .\" Copyright (c) 2007 The NetBSD Foundation, Inc.
                      4: .\" All rights reserved.
                      5: .\"
                      6: .\" This code is derived from software contributed to The NetBSD Foundation
                      7: .\" by Jason R. Thorpe.
                      8: .\"
                      9: .\" Redistribution and use in source and binary forms, with or without
                     10: .\" modification, are permitted provided that the following conditions
                     11: .\" are met:
                     12: .\" 1. Redistributions of source code must retain the above copyright
                     13: .\" notice, this list of conditions and the following disclaimer.
                     14: .\" 2. Redistributions in binary form must reproduce the above copyright
                     15: .\" notice, this list of conditions and the following disclaimer in the
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                     18: .\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     19: .\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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                     30: .Dd April 11, 2007
                     31: .Dt ATOMIC_OR 3
                     32: .Os
                     33: .Sh NAME
                     34: .Nm atomic_or ,
                     35: .Nm atomic_or_32 ,
                     36: .Nm atomic_or_uint ,
                     37: .Nm atomic_or_ulong ,
                     38: .Nm atomic_or_64 ,
                     39: .Nm atomic_or_32_nv ,
                     40: .Nm atomic_or_uint_nv ,
                     41: .Nm atomic_or_ulong_nv ,
                     42: .Nm atomic_or_64_nv
1.1.62.1! pgoyette   43: .Nd atomic bitwise
1.1       ad         44: .Sq or
                     45: operations
                     46: .\" .Sh LIBRARY
                     47: .\" .Lb libc
                     48: .Sh SYNOPSIS
                     49: .In sys/atomic.h
                     50: .Ft void
                     51: .Fn atomic_or_32 "volatile uint32_t *ptr" "uint32_t bits"
                     52: .Ft void
                     53: .Fn atomic_or_uint "volatile unsigned int *ptr" "unsigned int bits"
                     54: .Ft void
                     55: .Fn atomic_or_ulong "volatile unsigned long *ptr" "unsigned long bits"
                     56: .Ft void
                     57: .Fn atomic_or_64 "volatile uint64_t *ptr" "uint64_t bits"
                     58: .Ft uint32_t
                     59: .Fn atomic_or_32_nv "volatile uint32_t *ptr" "uint32_t bits"
                     60: .Ft unsigned int
                     61: .Fn atomic_or_uint_nv "volatile unsigned int *ptr" "unsigned int bits"
                     62: .Ft unsigned long
                     63: .Fn atomic_or_ulong_nv "volatile unsigned long *ptr" "unsigned long bits"
                     64: .Ft uint64_t
                     65: .Fn atomic_or_64_nv "volatile uint64_t *ptr" "uint64_t bits"
                     66: .Sh DESCRIPTION
                     67: The
                     68: .Nm atomic_or
                     69: family of functions load the value of the variable referenced by
                     70: .Fa ptr ,
1.1.62.1! pgoyette   71: perform a bitwise
1.1       ad         72: .Sq or
                     73: with the value
                     74: .Fa bits ,
                     75: and store the result back to the variable referenced by
                     76: .Fa ptr
                     77: in an atomic fashion.
                     78: .Pp
                     79: The
                     80: .Fn *_nv
                     81: variants of these functions return the new value.
                     82: .Pp
                     83: The 64-bit variants of these functions are available only on platforms
                     84: that can support atomic 64-bit memory access.
                     85: Applications can check for the availability of 64-bit atomic memory
                     86: operations by testing if the pre-processor macro
                     87: .Dv __HAVE_ATOMIC64_OPS
                     88: is defined.
                     89: .Sh SEE ALSO
                     90: .Xr atomic_ops 3
                     91: .Sh HISTORY
                     92: The
                     93: .Nm atomic_or
                     94: functions first appeared in
                     95: .Nx 5.0 .

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