2009-07-30 21:33:57 +02:00
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/*
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2009-08-02 01:30:31 +02:00
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* Copyright (C) 2007 Chris Wilson
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* Copyright (C) 2009 Red Hat, Inc.
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2009-07-30 21:33:57 +02:00
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*
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* This is part of HarfBuzz, an OpenType Layout engine library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Contributor(s):
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* Chris Wilson <chris@chris-wilson.co.uk>
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2009-08-02 01:30:31 +02:00
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* Red Hat Author(s): Behdad Esfahbod
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2009-07-30 21:33:57 +02:00
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*/
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#ifndef HB_REFCOUNT_PRIVATE_H
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#define HB_REFCOUNT_PRIVATE_H
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typedef int hb_atomic_int_t;
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/* Encapsulate operations on the object's reference count */
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typedef struct {
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hb_atomic_int_t ref_count;
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} hb_reference_count_t;
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/* XXX add real atomic ops */
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#define _hb_reference_count_inc(RC) ((RC).ref_count++)
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#define _hb_reference_count_dec_and_test(RC) ((RC).ref_count-- == 1)
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#define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
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#define HB_REFERENCE_COUNT_GET_VALUE(RC) ((RC).ref_count+0)
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#define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) ((RC).ref_count = (VALUE), 0)
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#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
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#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
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#define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE)
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#define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0)
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2009-08-02 01:30:31 +02:00
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/* Helper macros */
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#define HB_REFERENCE_COUNT_DO_CREATE(obj) \
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HB_STMT_START { \
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HB_REFERENCE_COUNT_INIT (obj->ref_count, 1); \
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} HB_STMT_END
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#define HB_REFERENCE_COUNT_DO_REFERENCE(obj) \
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HB_STMT_START { \
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if (obj == NULL || HB_REFERENCE_COUNT_IS_INVALID (obj->ref_count)) \
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return obj; \
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assert (HB_REFERENCE_COUNT_HAS_REFERENCE (obj->ref_count)); \
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_hb_reference_count_inc (obj->ref_count); \
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return obj; \
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} HB_STMT_END
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#define HB_REFERENCE_COUNT_DO_DESTROY(obj) \
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HB_STMT_START { \
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if (obj == NULL || HB_REFERENCE_COUNT_IS_INVALID (obj->ref_count)) \
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return; \
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assert (HB_REFERENCE_COUNT_HAS_REFERENCE (obj->ref_count)); \
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if (!_hb_reference_count_dec_and_test (obj->ref_count)) \
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return; \
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} HB_STMT_END
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2009-07-30 21:33:57 +02:00
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#endif /* HB_REFCOUNT_PRIVATE_H */
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