2 * Copyright © 2007 Chris Wilson
4 * This is part of HarfBuzz, an OpenType Layout engine library.
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 * Chris Wilson <chris@chris-wilson.co.uk>
28 #ifndef HB_REFCOUNT_PRIVATE_H
29 #define HB_REFCOUNT_PRIVATE_H
31 typedef int hb_atomic_int_t;
33 /* Encapsulate operations on the object's reference count */
35 hb_atomic_int_t ref_count;
36 } hb_reference_count_t;
38 /* XXX add real atomic ops */
39 #define _hb_reference_count_inc(RC) ((RC).ref_count++)
40 #define _hb_reference_count_dec_and_test(RC) ((RC).ref_count-- == 1)
42 #define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
44 #define HB_REFERENCE_COUNT_GET_VALUE(RC) ((RC).ref_count+0)
45 #define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) ((RC).ref_count = (VALUE), 0)
47 #define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
48 #define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
50 #define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE)
52 #define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0)
54 #endif /* HB_REFCOUNT_PRIVATE_H */