| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| #pragma once |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| /* A type-safe atomic refcounter */ |
| |
| typedef struct { |
| volatile unsigned _value; |
| } RefCount; |
| |
| #define REFCNT_GET(r) ((r)._value) |
| #define REFCNT_INC(r) (__sync_add_and_fetch(&(r)._value, 1)) |
| #define REFCNT_DEC(r) (__sync_sub_and_fetch(&(r)._value, 1)) |
| |
| #define REFCNT_INIT ((RefCount) { ._value = 1 }) |