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Add g_object_add/remove_toggle_ref() functions to get notification when a

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2005-05-05  Owen Taylor  <otaylor@redhat.com>

        * gobject.[ch] gobject.symbols: Add
        g_object_add/remove_toggle_ref() functions to get notification
        when a reference count is the last remaining reference; this
        enables better memory management for language bindings.
        (http://mail.gnome.org/archives/gtk-devel-list/2005-April/msg00095.html)

2005-05-05  Owen Taylor  <otaylor@redhat.com>

        * glib/gdataset.[ch] glib/gdatasetprivate.h: Add
        g_datalist_set/unset_flags(), g_datalist_get_flags() functions
        to squeeze some bits into a GDataSet... this is needed for
        efficient implementation of toggle references in GObject.

        * tests/gobject/references.c tests/gobject/Makefile.am:
        Add a test case for weak and toggle references.

        * glib/gfileutils.[ch]: Rename g_file_replace() back
        to g_file_set_contents().

        * glib/glib.symbols: Update.

2005-05-05  Owen Taylor  <otaylor@redhat.com>

        * glib/Makefile.am glib/glib-sections.txt gobject/gobject-sections.txt:
        Update

        * gobject/tmpl/objects.sgml: Document toggle-references.
This commit is contained in:
Owen Taylor
2005-05-05 14:57:29 +00:00
committed by Owen Taylor
parent 1167d7d6a7
commit 2ae1a46b4c
83 changed files with 1026 additions and 61 deletions
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121
gobject/gobject.c
View File

@@ -18,6 +18,7 @@
*/
#include "gobject.h"
#include "gobjectalias.h"
#include <glib/gdatasetprivate.h>
/*
* MT safe
@@ -39,6 +40,10 @@
#define PARAM_SPEC_PARAM_ID(pspec) ((pspec)->param_id)
#define PARAM_SPEC_SET_PARAM_ID(pspec, id) ((pspec)->param_id = (id))
#define OBJECT_HAS_TOGGLE_REF_FLAG 0x1
#define OBJECT_HAS_TOGGLE_REF(object) \
((G_DATALIST_GET_FLAGS(&(object)->qdata) & OBJECT_HAS_TOGGLE_REF_FLAG) != 0)
/* --- signals --- */
enum {
@@ -105,6 +110,7 @@ static void object_interface_check_properties (gpointer func_da
/* --- variables --- */
static GQuark quark_closure_array = 0;
static GQuark quark_weak_refs = 0;
static GQuark quark_toggle_refs = 0;
static GParamSpecPool *pspec_pool = NULL;
static GObjectNotifyContext property_notify_context = { 0, };
static gulong gobject_signals[LAST_SIGNAL] = { 0, };
@@ -241,6 +247,7 @@ g_object_do_class_init (GObjectClass *class)
quark_closure_array = g_quark_from_static_string ("GObject-closure-array");
quark_weak_refs = g_quark_from_static_string ("GObject-weak-references");
quark_toggle_refs = g_quark_from_static_string ("GObject-toggle-references");
pspec_pool = g_param_spec_pool_new (TRUE);
property_notify_context.quark_notify_queue = g_quark_from_static_string ("GObject-notify-queue");
property_notify_context.dispatcher = g_object_notify_dispatcher;
@@ -1519,10 +1526,8 @@ g_object_weak_unref (GObject *object,
found_one = TRUE;
wstack->n_weak_refs -= 1;
if (i != wstack->n_weak_refs)
{
wstack->weak_refs[i].notify = wstack->weak_refs[wstack->n_weak_refs].notify;
wstack->weak_refs[i].data = wstack->weak_refs[wstack->n_weak_refs].data;
}
wstack->weak_refs[i] = wstack->weak_refs[wstack->n_weak_refs];
break;
}
}
@@ -1554,6 +1559,106 @@ g_object_remove_weak_pointer (GObject *object,
weak_pointer_location);
}
typedef struct {
GObject *object;
guint n_toggle_refs;
struct {
GToggleNotify notify;
gpointer data;
} toggle_refs[1]; /* flexible array */
} ToggleRefStack;
static void
toggle_refs_notify (GObject *object,
gboolean is_last_ref)
{
ToggleRefStack *tstack = g_datalist_id_get_data (&object->qdata, quark_toggle_refs);
/* Reentrancy here is not as tricky as it seems, because a toggle reference
* will only be notified when there is exactly one of them.
*/
g_assert (tstack->n_toggle_refs == 1);
tstack->toggle_refs[0].notify (tstack->toggle_refs[0].data, tstack->object, is_last_ref);
}
void
g_object_add_toggle_ref (GObject *object,
GToggleNotify notify,
gpointer data)
{
ToggleRefStack *tstack;
guint i;
g_return_if_fail (G_IS_OBJECT (object));
g_return_if_fail (notify != NULL);
g_return_if_fail (object->ref_count >= 1);
g_object_ref (object);
tstack = g_datalist_id_remove_no_notify (&object->qdata, quark_toggle_refs);
if (tstack)
{
i = tstack->n_toggle_refs++;
/* allocate i = tstate->n_toggle_refs - 1 positions beyond the 1 declared
* in tstate->toggle_refs */
tstack = g_realloc (tstack, sizeof (*tstack) + sizeof (tstack->toggle_refs[0]) * i);
}
else
{
tstack = g_renew (ToggleRefStack, NULL, 1);
tstack->object = object;
tstack->n_toggle_refs = 1;
i = 0;
}
/* Set a flag for fast lookup after adding the first toggle reference */
if (tstack->n_toggle_refs == 1)
G_DATALIST_SET_FLAGS (&object->qdata, OBJECT_HAS_TOGGLE_REF_FLAG);
tstack->toggle_refs[i].notify = notify;
tstack->toggle_refs[i].data = data;
g_datalist_id_set_data_full (&object->qdata, quark_toggle_refs, tstack,
(GDestroyNotify)g_free);
}
void
g_object_remove_toggle_ref (GObject *object,
GToggleNotify notify,
gpointer data)
{
ToggleRefStack *tstack;
gboolean found_one = FALSE;
g_return_if_fail (G_IS_OBJECT (object));
g_return_if_fail (notify != NULL);
tstack = g_datalist_id_get_data (&object->qdata, quark_toggle_refs);
if (tstack)
{
guint i;
for (i = 0; i < tstack->n_toggle_refs; i++)
if (tstack->toggle_refs[i].notify == notify &&
tstack->toggle_refs[i].data == data)
{
found_one = TRUE;
tstack->n_toggle_refs -= 1;
if (i != tstack->n_toggle_refs)
tstack->toggle_refs[i] = tstack->toggle_refs[tstack->n_toggle_refs];
if (tstack->n_toggle_refs == 0)
G_DATALIST_UNSET_FLAGS (&object->qdata, OBJECT_HAS_TOGGLE_REF_FLAG);
g_object_unref (object);
break;
}
}
if (!found_one)
g_warning ("%s: couldn't find toggle ref %p(%p)", G_STRFUNC, notify, data);
}
gpointer
g_object_ref (gpointer _object)
{
@@ -1568,6 +1673,8 @@ g_object_ref (gpointer _object)
#endif /* G_ENABLE_DEBUG */
object->ref_count += 1;
if (object->ref_count == 2 && OBJECT_HAS_TOGGLE_REF (object))
toggle_refs_notify (object, FALSE);
return object;
}
@@ -1586,7 +1693,11 @@ g_object_unref (gpointer _object)
#endif /* G_ENABLE_DEBUG */
if (object->ref_count > 1)
object->ref_count -= 1;
{
object->ref_count -= 1;
if (object->ref_count == 1 && OBJECT_HAS_TOGGLE_REF (object))
toggle_refs_notify (object, TRUE);
}
else
g_object_last_unref (object);
}