/*-*- 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. * * DO NOT USE THIS UNLESS YOU ACTUALLY CARE ABOUT THREAD SAFETY! */ 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 })