source: rtems-libbsd/freebsd/sys/sys/_domainset.h @ 9561e24

6-freebsd-12
Last change on this file since 9561e24 was 9561e24, checked in by Stefan Eßer <se@…>, on 12/05/21 at 21:27:33

sys/bitset.h: reduce visibility of BIT_* macros

Add two underscore characters "" to names of BIT_* and BITSET_*
macros to move them to the implementation name space and to prevent
a name space pollution due to BIT_* macros in 3rd party programs with
conflicting parameter signatures.

These prefixed macro names are used in kernel header files to define
macros in e.g. sched.h, sys/cpuset.h and sys/domainset.h.

If C programs are built with either -D_KERNEL (automatically passed
when building a kernel or kernel modules) or -D_WANT_FREENBSD_BITSET
(or this macros is defined in the source code before including the
bitset macros), then all macros are made visible with their previous
names, too. E.g., both BIT_SET() and BIT_SET() are visible with
either of _KERNEL or _WANT_FREEBSD_BITSET defined.

The main reason for this change is that some 3rd party sources
including sched.h have been found to contain conflicting BIT_*
macros.

As a work-around, parts of shed.h have been made conditional and
depend on _WITH_CPU_SET_T being set when sched.h is included.
Ports that expect the full functionality provided by sched.h need
to be built with -D_WITH_CPU_SET_T. But this leads to conflicts if
BIT_* macros are defined in that program, too.

This patch set makes all of sched.h visible again without this
parameter being passed and without any name space pollution due
to BIT_* macros becoming visible when sched.h is included.

This patch set will be backported to the STABLE branches, but ports
will need to use -D_WITH_CPU_SET_T as long as there are supported
releases that do not contain these patches.

Reviewed by: kib, markj
MFC after: 1 month
Relnotes: yes
Differential Revision: ​https://reviews.freebsd.org/D33235
  • Property mode set to 100644
File size: 2.0 KB
Line 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2017,  Jeffrey Roberson <jeff@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#ifndef _SYS__DOMAINSET_H_
32#define _SYS__DOMAINSET_H_
33
34#include <sys/_bitset.h>
35
36#ifdef _KERNEL
37#define DOMAINSET_SETSIZE       MAXMEMDOM
38#endif
39
40#define DOMAINSET_MAXSIZE       256
41
42#ifndef DOMAINSET_SETSIZE
43#define DOMAINSET_SETSIZE       DOMAINSET_MAXSIZE
44#endif
45
46__BITSET_DEFINE(_domainset, DOMAINSET_SETSIZE);
47typedef struct _domainset domainset_t;
48
49/*
50 * This structure is intended to be embedded in objects which have policy
51 * attributes.  Each object keeps its own iterator so round-robin is
52 * synchronized and accurate.
53 */
54struct domainset;
55struct domainset_ref {
56        struct domainset * volatile     dr_policy;
57        unsigned int                    dr_iter;
58};
59
60#endif /* !_SYS__DOMAINSET_H_ */
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