mirror of
https://github.com/awesomeWM/awesome
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ea646e7077
put *item to NULL on unref, as we cannot know if the pointer is valid after an unref, so just segfault rather than hide a problem. Also return *item on ref() it allow short versions like: foo_list_push(&list, foo_ref(&elem)); which is kind of readable _and_ handy. Signed-off-by: Pierre Habouzit <madcoder@debian.org>
41 lines
2 KiB
C
41 lines
2 KiB
C
/*
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* refcount.h - useful reference counter handling header
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*
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* Copyright © 2008 Julien Danjou <julien@danjou.info>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef AWESOME_COMMON_REFCOUNT_H
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#define AWESOME_COMMON_REFCOUNT_H
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#include <assert.h>
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#define DO_RCNT(type, prefix, dtor) \
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static inline void prefix##_unref(type **item) \
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{ \
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if(*item && --(*item)->refcount <= 0) \
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dtor(item); \
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*item = NULL; \
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} \
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\
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static inline type *prefix##_ref(type **item) \
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{ \
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(*item)->refcount++; \
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return *item; \
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}
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#endif
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// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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