дзеркало
https://github.com/rspamd/rspamd.git
synced 2024-07-29 20:17:47 +02:00
72 рядки
2.4 KiB
C
72 рядки
2.4 KiB
C
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/* Copyright (c) 2014, Vsevolod Stakhov
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef REF_H_
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#define REF_H_
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/**
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* @file ref.h
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* A set of macros to handle refcounts
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*/
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typedef void (*ref_dtor_cb_t)(void *data);
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typedef struct ref_entry_s {
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unsigned int refcount;
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ref_dtor_cb_t dtor;
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} ref_entry_t;
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#define REF_INIT(obj, dtor_cb) do { \
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(obj)->ref.refcount = 0; \
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(obj)->ref.dtor = (ref_dtor_cb_t)(dtor_cb); \
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} while (0)
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#define REF_INIT_RETAIN(obj, dtor_cb) do { \
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(obj)->ref.refcount = 1; \
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(obj)->ref.dtor = (ref_dtor_cb_t)(dtor_cb); \
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} while (0)
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#ifdef HAVE_ATOMIC_BUILTINS
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#define REF_RETAIN(obj) do { \
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__sync_add_and_fetch (&(obj)->ref.refcount, 1); \
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} while (0)
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#define REF_RELEASE(obj) do { \
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unsigned int rc = __sync_sub_and_fetch (&(obj)->ref.refcount, 1); \
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if (rc == 0 && (obj)->ref.dtor) { \
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(obj)->ref.dtor (obj); \
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} \
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} while (0)
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#else
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#define REF_RETAIN(obj) do { \
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(obj)->ref.refcount ++; \
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} while (0)
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#define REF_RELEASE(obj) do { \
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if (--(obj)->ref.refcount == 0 && (obj)->ref.dtor) { \
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(obj)->ref.dtor (obj); \
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} \
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} while (0)
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#endif
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#endif /* REF_H_ */
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