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87f0a5a219
We need stronger alignment guarantees for the memory allocations done through g_rc_box_alloc_full(): while the passed block size may be aligned, we're not aligning the private data size; this means the overall allocation may become unaligned, and this could raise issues when we use the private data size as an offset to access the reference count. Fixes: #1581
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* grcboxprivate.h: Reference counted data
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*
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* Copyright 2018 Emmanuele Bassi
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "gtypes.h"
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#include "grcbox.h"
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G_BEGIN_DECLS
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typedef struct {
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grefcount ref_count;
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gsize mem_size;
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gsize private_offset;
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#ifndef G_DISABLE_ASSERT
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/* A "magic" number, used to perform additional integrity
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* checks on the allocated data
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*/
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guint32 magic;
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#endif
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} GRcBox;
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typedef struct {
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gatomicrefcount ref_count;
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gsize mem_size;
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gsize private_offset;
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#ifndef G_DISABLE_ASSERT
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guint32 magic;
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#endif
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} GArcBox;
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#define G_BOX_MAGIC 0x44ae2bf0
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/* Keep the two refcounted boxes identical in size */
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G_STATIC_ASSERT (sizeof (GRcBox) == sizeof (GArcBox));
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/* This is the default alignment we use when allocating the
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* refcounted memory blocks; it's similar to the alignment
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* guaranteed by the malloc() in GNU's libc and by the GSlice
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* allocator
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*/
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#define STRUCT_ALIGNMENT (2 * sizeof (gsize))
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#define G_RC_BOX_SIZE sizeof (GRcBox)
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#define G_ARC_BOX_SIZE sizeof (GArcBox)
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gpointer g_rc_box_alloc_full (gsize block_size,
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gsize alignment,
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gboolean atomic,
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gboolean clear);
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G_END_DECLS
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