124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/*
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* Copyright (C) 2007 Chris Wilson
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, a text shaping 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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* Red Hat Author(s): Behdad Esfahbod
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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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#ifndef HB_DEBUG_OBJECT
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#define HB_DEBUG_OBJECT HB_DEBUG
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#endif
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#if HB_DEBUG_OBJECT
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#include <stdio.h>
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#define HB_OBJECT_DEBUG_OUT(obj) fprintf (stderr, "%p refcount=%d %s\n", \
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obj, \
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HB_REFERENCE_COUNT_GET_VALUE (obj->ref_count), \
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__FUNCTION__)
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#else
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#define HB_OBJECT_DEBUG_OUT(obj) (void) 0
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#endif
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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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#define hb_reference_count_inc(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, 1)
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#define hb_reference_count_dec(RC) hb_atomic_int_fetch_and_add ((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) hb_atomic_int_get ((RC).ref_count)
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#define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) hb_atomic_int_set ((RC).ref_count, (VALUE))
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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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/* Helper macros */
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#define HB_OBJECT_IS_INERT(obj) \
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(HB_UNLIKELY (HB_REFERENCE_COUNT_IS_INVALID ((obj)->ref_count)))
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#define HB_OBJECT_DO_INIT_EXPR(obj) \
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HB_REFERENCE_COUNT_INIT (obj->ref_count, 1)
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#define HB_OBJECT_DO_INIT(obj) \
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HB_STMT_START { \
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HB_OBJECT_DO_INIT_EXPR (obj); \
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} HB_STMT_END
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#define HB_OBJECT_DO_CREATE(Type, obj) \
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HB_LIKELY (( \
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(obj) = (Type *) calloc (1, sizeof (Type)), \
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HB_OBJECT_DO_INIT_EXPR (obj), \
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HB_OBJECT_DEBUG_OUT (obj), \
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(obj) \
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))
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#define HB_OBJECT_DO_REFERENCE(obj) \
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HB_STMT_START { \
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int old_count; \
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if (HB_UNLIKELY (!(obj) || HB_OBJECT_IS_INERT (obj))) \
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return obj; \
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HB_OBJECT_DEBUG_OUT (obj); \
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old_count = hb_reference_count_inc (obj->ref_count); \
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assert (old_count > 0); \
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return obj; \
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} HB_STMT_END
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#define HB_OBJECT_DO_GET_REFERENCE_COUNT(obj) \
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HB_STMT_START { \
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if (HB_UNLIKELY (!(obj) || HB_OBJECT_IS_INERT (obj))) \
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return 0; \
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return HB_REFERENCE_COUNT_GET_VALUE (obj->ref_count); \
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} HB_STMT_END
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#define HB_OBJECT_DO_DESTROY(obj) \
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HB_STMT_START { \
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int old_count; \
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if (HB_UNLIKELY (!(obj) || HB_OBJECT_IS_INERT (obj))) \
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return; \
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HB_OBJECT_DEBUG_OUT (obj); \
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old_count = hb_reference_count_dec (obj->ref_count); \
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assert (old_count > 0); \
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if (old_count != 1) \
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return; \
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} HB_STMT_END
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#endif /* HB_REFCOUNT_PRIVATE_H */
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