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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e4ee6e5c LP |
2 | #pragma once |
3 | ||
4 | /*** | |
5 | This file is part of systemd. | |
6 | ||
7 | Copyright 2013 Lennart Poettering | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
57de20dd LP |
23 | /* A type-safe atomic refcounter. |
24 | * | |
25 | * DO NOT USE THIS UNLESS YOU ACTUALLY CARE ABOUT THREAD SAFETY! */ | |
e4ee6e5c LP |
26 | |
27 | typedef struct { | |
28 | volatile unsigned _value; | |
29 | } RefCount; | |
30 | ||
31 | #define REFCNT_GET(r) ((r)._value) | |
32 | #define REFCNT_INC(r) (__sync_add_and_fetch(&(r)._value, 1)) | |
33 | #define REFCNT_DEC(r) (__sync_sub_and_fetch(&(r)._value, 1)) | |
34 | ||
35 | #define REFCNT_INIT ((RefCount) { ._value = 1 }) |