2 * Copyright (C) 2007 Chris Wilson
3 * Copyright (C) 2009,2010 Red Hat, Inc.
5 * This is part of HarfBuzz, a text shaping library.
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
26 * Chris Wilson <chris@chris-wilson.co.uk>
27 * Red Hat Author(s): Behdad Esfahbod
30 #ifndef HB_REFCOUNT_PRIVATE_H
31 #define HB_REFCOUNT_PRIVATE_H
33 #include "hb-private.h"
37 /* Encapsulate operations on the object's reference count */
39 hb_atomic_int_t ref_count;
40 } hb_reference_count_t;
42 #define hb_reference_count_inc(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, 1)
43 #define hb_reference_count_dec(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, -1)
45 #define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
47 #define HB_REFERENCE_COUNT_GET_VALUE(RC) hb_atomic_int_get ((RC).ref_count)
48 #define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) hb_atomic_int_set ((RC).ref_count, (VALUE))
50 #define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
51 #define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
53 #define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE)
55 #define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0)
61 #ifndef HB_DEBUG_OBJECT
62 #define HB_DEBUG_OBJECT HB_DEBUG+0
65 static inline hb_bool_t /* always returns TRUE */
66 _hb_object_debug_out (const void *obj,
67 hb_reference_count_t *ref_count,
71 fprintf (stderr, "%p refcount=%d %s\n",
73 HB_REFERENCE_COUNT_GET_VALUE (*ref_count),
78 #define HB_OBJECT_DEBUG_OUT(obj) _hb_object_debug_out ((void *) obj, &obj->ref_count, __FUNCTION__)
82 /* Object allocation and lifecycle manamgement macros */
84 #define HB_OBJECT_IS_INERT(obj) \
85 (unlikely (HB_REFERENCE_COUNT_IS_INVALID ((obj)->ref_count)))
87 #define HB_OBJECT_DO_INIT_EXPR(obj) \
88 HB_REFERENCE_COUNT_INIT (obj->ref_count, 1)
90 #define HB_OBJECT_DO_INIT(obj) \
92 HB_OBJECT_DO_INIT_EXPR (obj); \
95 #define HB_OBJECT_DO_CREATE(Type, obj) \
98 ((obj) = (Type *) calloc (1, sizeof (Type))) && \
99 HB_OBJECT_DO_INIT_EXPR (obj) && \
100 HB_OBJECT_DEBUG_OUT (obj) \
105 #define HB_OBJECT_DO_REFERENCE(obj) \
108 if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
110 HB_OBJECT_DEBUG_OUT (obj); \
111 old_count = hb_reference_count_inc (obj->ref_count); \
112 assert (old_count > 0); \
116 #define HB_OBJECT_DO_GET_REFERENCE_COUNT(obj) \
118 if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
120 return HB_REFERENCE_COUNT_GET_VALUE (obj->ref_count); \
123 #define HB_OBJECT_DO_DESTROY(obj) \
126 if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
128 HB_OBJECT_DEBUG_OUT (obj); \
129 old_count = hb_reference_count_dec (obj->ref_count); \
130 assert (old_count > 0); \
131 if (old_count != 1) \
137 #endif /* HB_REFCOUNT_PRIVATE_H */