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Make g_rc_box_dup()/g_arc_box_dup() more generic

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It's more useful to have a dup() function that copies any blob of memory
into a reference counted allocation, than to have a dup() that only
copies a reference counted allocation.
This commit is contained in:
Emmanuele Bassi 2018-06-11 17:14:12 +01:00
parent b607927a43
commit 8990c3c4d3
4 changed files with 103 additions and 33 deletions
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21
glib/garcbox.c
View File

@ -222,29 +222,28 @@ g_arc_box_alloc0 (gsize block_size)
/**
* g_arc_box_dup:
* @mem_block: (not nullable): a pointer to reference counted data
* @block_size: the number of bytes to copy
* @mem_block: (not nullable): the memory to copy
*
* Allocates a new block of data with atomic reference counting
* semantics, and copies the contents of @mem_block into
* it.
* Allocates a new block of data with atomit reference counting
* semantics, and copies @block_size bytes of @mem_block
* into it.
*
* Returns: (not nullable): a pointer to the allocated memory
*
* Since: 2.58
*/
gpointer
(g_arc_box_dup) (gpointer mem_block)
(g_arc_box_dup) (gsize block_size,
gconstpointer mem_block)
{
GArcBox *real_box = G_ARC_BOX (mem_block);
gpointer res;
g_return_val_if_fail (block_size > 0, NULL);
g_return_val_if_fail (mem_block != NULL, NULL);
#ifndef G_DISABLE_ASSERT
g_return_val_if_fail (real_box->magic == G_BOX_MAGIC, NULL);
#endif
res = g_rc_box_alloc_full (real_box->mem_size, TRUE, FALSE);
memcpy (res, mem_block, real_box->mem_size);
res = g_rc_box_alloc_full (block_size, TRUE, FALSE);
memcpy (res, mem_block, block_size);
return res;
}

19
glib/grcbox.c
View File

@ -286,29 +286,28 @@ g_rc_box_alloc0 (gsize block_size)
/**
* g_rc_box_dup:
* @mem_block: (not nullable): a pointer to reference counted data
* @block_size: the number of bytes to copy
* @mem_block: (not nullable): the memory to copy
*
* Allocates a new block of data with reference counting
* semantics, and copies the contents of @mem_block into
* it.
* semantics, and copies @block_size bytes of @mem_block
* into it.
*
* Returns: (not nullable): a pointer to the allocated memory
*
* Since: 2.58
*/
gpointer
(g_rc_box_dup) (gpointer mem_block)
(g_rc_box_dup) (gsize block_size,
gconstpointer mem_block)
{
GRcBox *real_box = G_RC_BOX (mem_block);
gpointer res;
g_return_val_if_fail (block_size > 0, NULL);
g_return_val_if_fail (mem_block != NULL, NULL);
#ifndef G_DISABLE_ASSERT
g_return_val_if_fail (real_box->magic == G_BOX_MAGIC, NULL);
#endif
res = g_rc_box_alloc_full (real_box->mem_size, FALSE, FALSE);
memcpy (res, mem_block, real_box->mem_size);
res = g_rc_box_alloc_full (block_size, FALSE, FALSE);
memcpy (res, mem_block, block_size);
return res;
}

14
glib/grcbox.h
View File

@ -31,7 +31,8 @@ gpointer g_rc_box_alloc (gsize block_size) G_GNUC_MALL
GLIB_AVAILABLE_IN_2_58
gpointer g_rc_box_alloc0 (gsize block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer g_rc_box_dup (gpointer mem_block) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
gpointer g_rc_box_dup (gsize block_size,
gconstpointer mem_block) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer g_rc_box_acquire (gpointer mem_block);
GLIB_AVAILABLE_IN_2_58
@ -45,7 +46,8 @@ gpointer g_arc_box_alloc (gsize block_size) G_GNUC_MALL
GLIB_AVAILABLE_IN_2_58
gpointer g_arc_box_alloc0 (gsize block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer g_arc_box_dup (gpointer mem_block) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
gpointer g_arc_box_dup (gsize block_size,
gconstpointer mem_block) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
GLIB_AVAILABLE_IN_2_58
gpointer g_arc_box_acquire (gpointer mem_block);
GLIB_AVAILABLE_IN_2_58
@ -71,10 +73,10 @@ void g_arc_box_release_full (gpointer mem_block,
((__typeof__(mem_block)) (g_arc_box_acquire) (mem_block))
/* Type check to avoid duplicating data to different types */
# define g_rc_box_dup(mem_block) \
((__typeof__(mem_block)) (g_rc_box_dup) (mem_block))
# define g_arc_box_dup(mem_block) \
((__typeof__(mem_block)) (g_arc_box_dup) (mem_block))
# define g_rc_box_dup(block_size,mem_block) \
((__typeof__(mem_block)) (g_rc_box_dup) (block_size,mem_block))
# define g_arc_box_dup(block_size,mem_block) \
((__typeof__(mem_block)) (g_arc_box_dup) (block_size,mem_block))
#endif
G_END_DECLS

82
glib/tests/rcbox.c
View File

@ -1,3 +1,21 @@
/* rcbox.c: Reference counted data
*
* Copyright 2018 Emmanuele Bassi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <glib.h>
typedef struct {
@ -6,6 +24,7 @@ typedef struct {
static Point *global_point;
/* test_rcbox_new: Test g_rc_box_new() */
static void
test_rcbox_new (void)
{
@ -27,14 +46,18 @@ static void
point_clear (Point *p)
{
g_assert_nonnull (p);
g_assert_true (global_point == p);
g_assert_cmpfloat (p->x, ==, 42.0f);
g_assert_cmpfloat (p->y, ==, 47.0f);
g_assert_true (global_point == p);
g_test_message ("global_point = %p", p);
global_point = NULL;
}
/* test_rcbox_release_full: Verify that g_rc_box_release_full() calls
* the clear function only when the last reference is released
*/
static void
test_rcbox_release_full (void)
{
@ -56,16 +79,63 @@ test_rcbox_release_full (void)
g_assert_null (global_point);
}
static Point *global_point_a;
static Point *global_point_b;
static void
point_clear_dup_a (Point *a)
{
g_assert_true (a == global_point_a);
g_test_message ("global_point_a = %p", a);
global_point_a = NULL;
}
static void
point_clear_dup_b (Point *b)
{
g_assert_true (b == global_point_b);
g_test_message ("global_point_b = %p", b);
global_point_b = NULL;
}
/* test_rcbox_dup: Verify that g_rc_box_dup() copies only the
* data and does not change the reference count of the original
*/
static void
test_rcbox_dup (void)
{
Point *a = g_rc_box_new (Point);
Point *b = g_rc_box_dup (a);
Point *a, *b;
a = g_rc_box_new (Point);
a->x = 10.f;
a->y = 5.f;
b = g_rc_box_dup (sizeof (Point), a);
g_assert_true (a != b);
g_assert_cmpfloat (a->x, ==, b->x);
g_assert_cmpfloat (a->y, ==, b->y);
g_rc_box_release (a);
g_rc_box_release (b);
global_point_a = a;
global_point_b = b;
a->x = 1.f;
a->y = 1.f;
g_assert_cmpfloat (a->x, !=, b->x);
g_assert_cmpfloat (a->y, !=, b->y);
b->x = 5.f;
b->y = 10.f;
g_assert_cmpfloat (a->x, !=, b->x);
g_assert_cmpfloat (a->y, !=, b->y);
g_rc_box_release_full (a, (GDestroyNotify) point_clear_dup_a);
g_assert_null (global_point_a);
g_assert_nonnull (global_point_b);
g_rc_box_release_full (b, (GDestroyNotify) point_clear_dup_b);
g_assert_null (global_point_b);
}
int
@ -75,8 +145,8 @@ main (int argc,
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/rcbox/new", test_rcbox_new);
g_test_add_func ("/rcbox/dup", test_rcbox_dup);
g_test_add_func ("/rcbox/release-full", test_rcbox_release_full);
g_test_add_func ("/rcbox/dup", test_rcbox_dup);
return g_test_run ();
}