LCOV - code coverage report
Current view: top level - glib/glib - garcbox.c (source / functions) Hit Total Coverage
Test: unnamed Lines: 38 38 100.0 %
Date: 2024-04-16 05:15:53 Functions: 7 7 100.0 %
Branches: 4 4 100.0 %

           Branch data     Line data    Source code
       1                 :            : /* garcbox.c: Atomically 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                 :            : #include "config.h"
      22                 :            : 
      23                 :            : #include "grcboxprivate.h"
      24                 :            : 
      25                 :            : #include "gmessages.h"
      26                 :            : #include "grefcount.h"
      27                 :            : 
      28                 :            : #ifdef ENABLE_VALGRIND
      29                 :            : #include "valgrind.h"
      30                 :            : #endif
      31                 :            : 
      32                 :            : #include "glib_trace.h"
      33                 :            : 
      34                 :            : #include <string.h>
      35                 :            : 
      36                 :            : #define G_ARC_BOX(p)            (GArcBox *) (((char *) (p)) - G_ARC_BOX_SIZE)
      37                 :            : 
      38                 :            : /**
      39                 :            :  * g_atomic_rc_box_alloc:
      40                 :            :  * @block_size: the size of the allocation, must be greater than 0
      41                 :            :  *
      42                 :            :  * Allocates @block_size bytes of memory, and adds atomic
      43                 :            :  * reference counting semantics to it.
      44                 :            :  *
      45                 :            :  * The data will be freed when its reference count drops to
      46                 :            :  * zero.
      47                 :            :  *
      48                 :            :  * The allocated data is guaranteed to be suitably aligned for any
      49                 :            :  * built-in type.
      50                 :            :  *
      51                 :            :  * Returns: (transfer full) (not nullable): a pointer to the allocated memory
      52                 :            :  *
      53                 :            :  * Since: 2.58
      54                 :            :  */
      55                 :            : gpointer
      56                 :          5 : g_atomic_rc_box_alloc (gsize block_size)
      57                 :            : {
      58                 :          5 :   g_return_val_if_fail (block_size > 0, NULL);
      59                 :            : 
      60                 :          5 :   return g_rc_box_alloc_full (block_size, STRUCT_ALIGNMENT, TRUE, FALSE);
      61                 :            : }
      62                 :            : 
      63                 :            : /**
      64                 :            :  * g_atomic_rc_box_alloc0:
      65                 :            :  * @block_size: the size of the allocation, must be greater than 0
      66                 :            :  *
      67                 :            :  * Allocates @block_size bytes of memory, and adds atomic
      68                 :            :  * reference counting semantics to it.
      69                 :            :  *
      70                 :            :  * The contents of the returned data is set to zero.
      71                 :            :  *
      72                 :            :  * The data will be freed when its reference count drops to
      73                 :            :  * zero.
      74                 :            :  *
      75                 :            :  * The allocated data is guaranteed to be suitably aligned for any
      76                 :            :  * built-in type.
      77                 :            :  *
      78                 :            :  * Returns: (transfer full) (not nullable): a pointer to the allocated memory
      79                 :            :  *
      80                 :            :  * Since: 2.58
      81                 :            :  */
      82                 :            : gpointer
      83                 :        765 : g_atomic_rc_box_alloc0 (gsize block_size)
      84                 :            : {
      85                 :        765 :   g_return_val_if_fail (block_size > 0, NULL);
      86                 :            : 
      87                 :        765 :   return g_rc_box_alloc_full (block_size, STRUCT_ALIGNMENT, TRUE, TRUE);
      88                 :            : }
      89                 :            : 
      90                 :            : /**
      91                 :            :  * g_atomic_rc_box_new:
      92                 :            :  * @type: the type to allocate, typically a structure name
      93                 :            :  *
      94                 :            :  * A convenience macro to allocate atomically reference counted
      95                 :            :  * data with the size of the given @type.
      96                 :            :  *
      97                 :            :  * This macro calls g_atomic_rc_box_alloc() with `sizeof (@type)` and
      98                 :            :  * casts the returned pointer to a pointer of the given @type,
      99                 :            :  * avoiding a type cast in the source code.
     100                 :            :  *
     101                 :            :  * Returns: (transfer full) (not nullable): a pointer to the allocated
     102                 :            :  *   memory, cast to a pointer for the given @type
     103                 :            :  *
     104                 :            :  * Since: 2.58
     105                 :            :  */
     106                 :            : 
     107                 :            : /**
     108                 :            :  * g_atomic_rc_box_new0:
     109                 :            :  * @type: the type to allocate, typically a structure name
     110                 :            :  *
     111                 :            :  * A convenience macro to allocate atomically reference counted
     112                 :            :  * data with the size of the given @type, and set its contents
     113                 :            :  * to zero.
     114                 :            :  *
     115                 :            :  * This macro calls g_atomic_rc_box_alloc0() with `sizeof (@type)` and
     116                 :            :  * casts the returned pointer to a pointer of the given @type,
     117                 :            :  * avoiding a type cast in the source code.
     118                 :            :  *
     119                 :            :  * Returns: (transfer full) (not nullable): a pointer to the allocated
     120                 :            :  *   memory, cast to a pointer for the given @type
     121                 :            :  *
     122                 :            :  * Since: 2.58
     123                 :            :  */
     124                 :            : 
     125                 :            : /**
     126                 :            :  * g_atomic_rc_box_dup:
     127                 :            :  * @block_size: the number of bytes to copy, must be greater than 0
     128                 :            :  * @mem_block: (not nullable): the memory to copy
     129                 :            :  *
     130                 :            :  * Allocates a new block of data with atomic reference counting
     131                 :            :  * semantics, and copies @block_size bytes of @mem_block
     132                 :            :  * into it.
     133                 :            :  *
     134                 :            :  * Returns: (transfer full) (not nullable): a pointer to the allocated
     135                 :            :  *   memory
     136                 :            :  *
     137                 :            :  * Since: 2.58
     138                 :            :  */
     139                 :            : gpointer
     140                 :          6 : (g_atomic_rc_box_dup) (gsize         block_size,
     141                 :            :                        gconstpointer mem_block)
     142                 :            : {
     143                 :            :   gpointer res;
     144                 :            : 
     145                 :          6 :   g_return_val_if_fail (block_size > 0, NULL);
     146                 :          6 :   g_return_val_if_fail (mem_block != NULL, NULL);
     147                 :            : 
     148                 :          6 :   res = g_rc_box_alloc_full (block_size, STRUCT_ALIGNMENT, TRUE, FALSE);
     149                 :          6 :   memcpy (res, mem_block, block_size);
     150                 :            : 
     151                 :          6 :   return res;
     152                 :            : }
     153                 :            : 
     154                 :            : /**
     155                 :            :  * g_atomic_rc_box_acquire:
     156                 :            :  * @mem_block: (not nullable): a pointer to reference counted data
     157                 :            :  *
     158                 :            :  * Atomically acquires a reference on the data pointed by @mem_block.
     159                 :            :  *
     160                 :            :  * Returns: (transfer full) (not nullable): a pointer to the data,
     161                 :            :  *   with its reference count increased
     162                 :            :  *
     163                 :            :  * Since: 2.58
     164                 :            :  */
     165                 :            : gpointer
     166                 :        718 : (g_atomic_rc_box_acquire) (gpointer mem_block)
     167                 :            : {
     168                 :        718 :   GArcBox *real_box = G_ARC_BOX (mem_block);
     169                 :            : 
     170                 :        718 :   g_return_val_if_fail (mem_block != NULL, NULL);
     171                 :            : #ifndef G_DISABLE_ASSERT
     172                 :        718 :   g_return_val_if_fail (real_box->magic == G_BOX_MAGIC, NULL);
     173                 :            : #endif
     174                 :            : 
     175                 :        718 :   g_atomic_ref_count_inc (&real_box->ref_count);
     176                 :            : 
     177                 :        718 :   TRACE (GLIB_RCBOX_ACQUIRE (mem_block, 1));
     178                 :            : 
     179                 :        718 :   return mem_block;
     180                 :            : }
     181                 :            : 
     182                 :            : /**
     183                 :            :  * g_atomic_rc_box_release:
     184                 :            :  * @mem_block: (transfer full) (not nullable): a pointer to reference counted data
     185                 :            :  *
     186                 :            :  * Atomically releases a reference on the data pointed by @mem_block.
     187                 :            :  *
     188                 :            :  * If the reference was the last one, it will free the
     189                 :            :  * resources allocated for @mem_block.
     190                 :            :  *
     191                 :            :  * Since: 2.58
     192                 :            :  */
     193                 :            : void
     194                 :          6 : g_atomic_rc_box_release (gpointer mem_block)
     195                 :            : {
     196                 :          6 :   g_atomic_rc_box_release_full (mem_block, NULL);
     197                 :          6 : }
     198                 :            : 
     199                 :            : /**
     200                 :            :  * g_atomic_rc_box_release_full:
     201                 :            :  * @mem_block: (transfer full) (not nullable): a pointer to reference counted data
     202                 :            :  * @clear_func: (not nullable): a function to call when clearing the data
     203                 :            :  *
     204                 :            :  * Atomically releases a reference on the data pointed by @mem_block.
     205                 :            :  *
     206                 :            :  * If the reference was the last one, it will call @clear_func
     207                 :            :  * to clear the contents of @mem_block, and then will free the
     208                 :            :  * resources allocated for @mem_block.
     209                 :            :  *
     210                 :            :  * Since: 2.58
     211                 :            :  */
     212                 :            : void
     213                 :       1494 : g_atomic_rc_box_release_full (gpointer       mem_block,
     214                 :            :                               GDestroyNotify clear_func)
     215                 :            : {
     216                 :       1494 :   GArcBox *real_box = G_ARC_BOX (mem_block);
     217                 :            : 
     218                 :       1494 :   g_return_if_fail (mem_block != NULL);
     219                 :            : #ifndef G_DISABLE_ASSERT
     220                 :       1494 :   g_return_if_fail (real_box->magic == G_BOX_MAGIC);
     221                 :            : #endif
     222                 :            : 
     223         [ +  + ]:       1494 :   if (g_atomic_ref_count_dec (&real_box->ref_count))
     224                 :            :     {
     225                 :        776 :       char *real_mem = (char *) real_box - real_box->private_offset;
     226                 :            : 
     227                 :        776 :       TRACE (GLIB_RCBOX_RELEASE (mem_block, 1));
     228                 :            : 
     229         [ +  + ]:        776 :       if (clear_func != NULL)
     230                 :        770 :         clear_func (mem_block);
     231                 :            : 
     232                 :        776 :       TRACE (GLIB_RCBOX_FREE (mem_block));
     233                 :        776 :       g_free (real_mem);
     234                 :            :     }
     235                 :            : }
     236                 :            : 
     237                 :            : /**
     238                 :            :  * g_atomic_rc_box_get_size:
     239                 :            :  * @mem_block: (not nullable): a pointer to reference counted data
     240                 :            :  *
     241                 :            :  * Retrieves the size of the reference counted data pointed by @mem_block.
     242                 :            :  *
     243                 :            :  * Returns: the size of the data, in bytes
     244                 :            :  *
     245                 :            :  * Since: 2.58
     246                 :            :  */
     247                 :            : gsize
     248                 :          5 : g_atomic_rc_box_get_size (gpointer mem_block)
     249                 :            : {
     250                 :          5 :   GArcBox *real_box = G_ARC_BOX (mem_block);
     251                 :            : 
     252                 :          5 :   g_return_val_if_fail (mem_block != NULL, 0);
     253                 :            : #ifndef G_DISABLE_ASSERT
     254                 :          5 :   g_return_val_if_fail (real_box->magic == G_BOX_MAGIC, 0);
     255                 :            : #endif
     256                 :            : 
     257                 :          5 :   return real_box->mem_size;
     258                 :            : }

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