2 * Copyright (C) 2007 Chris Wilson
3 * Copyright (C) 2009 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
34 #ifndef HB_DEBUG_OBJECT
35 #define HB_DEBUG_OBJECT HB_DEBUG
40 #define HB_OBJECT_DEBUG_OUT(obj) fprintf (stderr, "%p refcount=%d %s\n", \
42 HB_REFERENCE_COUNT_GET_VALUE (obj->ref_count), \
45 #define HB_OBJECT_DEBUG_OUT(obj) (void) 0
49 /* Encapsulate operations on the object's reference count */
51 hb_atomic_int_t ref_count;
52 } hb_reference_count_t;
54 #define hb_reference_count_inc(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, 1)
55 #define hb_reference_count_dec(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, -1)
57 #define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
59 #define HB_REFERENCE_COUNT_GET_VALUE(RC) hb_atomic_int_get ((RC).ref_count)
60 #define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) hb_atomic_int_set ((RC).ref_count, (VALUE))
62 #define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
63 #define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
65 #define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE)
67 #define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0)
73 #define HB_OBJECT_IS_INERT(obj) \
74 (HB_UNLIKELY (HB_REFERENCE_COUNT_IS_INVALID ((obj)->ref_count)))
76 #define HB_OBJECT_DO_INIT_EXPR(obj) \
77 HB_REFERENCE_COUNT_INIT (obj->ref_count, 1)
79 #define HB_OBJECT_DO_INIT(obj) \
81 HB_OBJECT_DO_INIT_EXPR (obj); \
84 #define HB_OBJECT_DO_CREATE(Type, obj) \
86 (obj) = (Type *) calloc (1, sizeof (Type)), \
87 HB_OBJECT_DO_INIT_EXPR (obj), \
88 HB_OBJECT_DEBUG_OUT (obj), \
92 #define HB_OBJECT_DO_REFERENCE(obj) \
95 if (HB_UNLIKELY (!(obj) || HB_OBJECT_IS_INERT (obj))) \
97 HB_OBJECT_DEBUG_OUT (obj); \
98 old_count = hb_reference_count_inc (obj->ref_count); \
99 assert (old_count > 0); \
103 #define HB_OBJECT_DO_GET_REFERENCE_COUNT(obj) \
105 if (HB_UNLIKELY (!(obj) || HB_OBJECT_IS_INERT (obj))) \
107 return HB_REFERENCE_COUNT_GET_VALUE (obj->ref_count); \
110 #define HB_OBJECT_DO_DESTROY(obj) \
113 if (HB_UNLIKELY (!(obj) || HB_OBJECT_IS_INERT (obj))) \
115 HB_OBJECT_DEBUG_OUT (obj); \
116 old_count = hb_reference_count_dec (obj->ref_count); \
117 assert (old_count > 0); \
118 if (old_count != 1) \
123 #endif /* HB_REFCOUNT_PRIVATE_H */