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