1  /* grcboxprivate.h: Reference counted data
       2   *
       3   * Copyright 2018  Emmanuele Bassi
       4   *
       5   * SPDX-License-Identifier: LGPL-2.1-or-later
       6   *
       7   * This library is free software; you can redistribute it and/or
       8   * modify it under the terms of the GNU Lesser General Public
       9   * License as published by the Free Software Foundation; either
      10   * version 2.1 of the License, or (at your option) any later version.
      11   *
      12   * This library is distributed in the hope that it will be useful,
      13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15   * Lesser General Public License for more details.
      16   *
      17   * You should have received a copy of the GNU Lesser General Public
      18   * License along with this library; if not, see <http://www.gnu.org/licenses/>.
      19   */
      20  
      21  #pragma once
      22  
      23  #include "gtypes.h"
      24  #include "grcbox.h"
      25  
      26  G_BEGIN_DECLS
      27  
      28  typedef struct {
      29    grefcount ref_count;
      30  
      31    gsize mem_size;
      32    gsize private_offset;
      33  
      34  #ifndef G_DISABLE_ASSERT
      35    /* A "magic" number, used to perform additional integrity
      36     * checks on the allocated data
      37     */
      38    guint32 magic;
      39  #endif
      40  } GRcBox;
      41  
      42  typedef struct {
      43    gatomicrefcount ref_count;
      44  
      45    gsize mem_size;
      46    gsize private_offset;
      47  
      48  #ifndef G_DISABLE_ASSERT
      49    guint32 magic;
      50  #endif
      51  } GArcBox;
      52  
      53  #define G_BOX_MAGIC             0x44ae2bf0
      54  
      55  /* Keep the two refcounted boxes identical in size */
      56  G_STATIC_ASSERT (sizeof (GRcBox) == sizeof (GArcBox));
      57  
      58  /* This is the default alignment we use when allocating the
      59   * refcounted memory blocks; it's similar to the alignment
      60   * guaranteed by the malloc() in GNU's libc and by the GSlice
      61   * allocator
      62   */
      63  #define STRUCT_ALIGNMENT (2 * sizeof (gsize))
      64  
      65  #define G_RC_BOX_SIZE sizeof (GRcBox)
      66  #define G_ARC_BOX_SIZE sizeof (GArcBox)
      67  
      68  gpointer        g_rc_box_alloc_full     (gsize    block_size,
      69                                           gsize    alignment,
      70                                           gboolean atomic,
      71                                           gboolean clear);
      72  
      73  G_END_DECLS