From e4ee6e5cc3e8e23e1ecc0d9fa756d9cc2534d218 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Thu, 16 May 2013 21:52:35 +0200 Subject: bus: make bus ref counting atomic This is preparation to allow sd_bus_message obejcts to be processed in a different thread from their originating sd_bus object. --- src/shared/refcnt.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 src/shared/refcnt.h (limited to 'src/shared/refcnt.h') diff --git a/src/shared/refcnt.h b/src/shared/refcnt.h new file mode 100644 index 0000000000..0502c20a2e --- /dev/null +++ b/src/shared/refcnt.h @@ -0,0 +1,34 @@ +/*-*- 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 . +***/ + +/* 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 }) -- cgit v1.2.3-54-g00ecf