57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/* Copyright 2010, 2011, 2012 Tony Garnock-Jones <tonygarnockjones@gmail.com>.
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*
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* This file is part of Hop.
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*
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* Hop is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Hop is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Hop. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef cmsg_ref_h
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#define cmsg_ref_h
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typedef struct refcount_t_ {
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unsigned int count;
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} refcount_t;
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#define ZERO_REFCOUNT() ((refcount_t) { .count = 0 })
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#define INCREF(x) ({ \
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typeof(x) __x = (x); \
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if (__x != NULL) { \
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__x->refcount.count++; \
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} \
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__x; \
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})
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#define UNGRAB(x) ({ \
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typeof(x) __x = (x); \
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if (__x != NULL) { \
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assert(__x->refcount.count); \
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__x->refcount.count--; \
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} \
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__x; \
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})
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#define DECREF(x, dtor) ({ \
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typeof(x) __x = (x); \
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if (__x != NULL) { \
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assert(__x->refcount.count); \
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(__x->refcount.count)--; \
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if (__x->refcount.count == 0) { \
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(dtor)(__x); \
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} \
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} \
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(typeof(__x)) 0; \
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})
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#endif
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