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949fba4b1f
* Making sure that `static inline` function are in the GIR (by first defining them, and make sure to mark as skiped) * Do not try to link to unexisting symbols * Also generate GIR information about gst_tracers
1109 lines
33 KiB
C
1109 lines
33 KiB
C
/* GStreamer
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* Copyright (C) 2005 David Schleef <ds@schleef.org>
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*
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* gstminiobject.h: Header for GstMiniObject
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstminiobject
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* @title: GstMiniObject
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* @short_description: Lightweight base class for the GStreamer object hierarchy
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*
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* #GstMiniObject is a simple structure that can be used to implement refcounted
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* types.
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*
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* Subclasses will include #GstMiniObject as the first member in their structure
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* and then call gst_mini_object_init() to initialize the #GstMiniObject fields.
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*
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* gst_mini_object_ref() and gst_mini_object_unref() increment and decrement the
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* refcount respectively. When the refcount of a mini-object reaches 0, the
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* dispose function is called first and when this returns %TRUE, the free
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* function of the miniobject is called.
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*
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* A copy can be made with gst_mini_object_copy().
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*
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* gst_mini_object_is_writable() will return %TRUE when the refcount of the
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* object is exactly 1 and there is no parent or a single parent exists and is
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* writable itself, meaning the current caller has the only reference to the
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* object. gst_mini_object_make_writable() will return a writable version of
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* the object, which might be a new copy when the refcount was not 1.
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*
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* Opaque data can be associated with a #GstMiniObject with
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* gst_mini_object_set_qdata() and gst_mini_object_get_qdata(). The data is
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* meant to be specific to the particular object and is not automatically copied
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* with gst_mini_object_copy() or similar methods.
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*
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* A weak reference can be added and remove with gst_mini_object_weak_ref()
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* and gst_mini_object_weak_unref() respectively.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gst/gst_private.h"
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#include "gst/gstminiobject.h"
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#include "gst/gstinfo.h"
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#include <gobject/gvaluecollector.h>
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/* Mutex used for weak referencing */
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G_LOCK_DEFINE_STATIC (qdata_mutex);
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static GQuark weak_ref_quark;
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#define SHARE_ONE (1 << 16)
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#define SHARE_TWO (2 << 16)
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#define SHARE_MASK (~(SHARE_ONE - 1))
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#define IS_SHARED(state) (state >= SHARE_TWO)
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#define LOCK_ONE (GST_LOCK_FLAG_LAST)
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#define FLAG_MASK (GST_LOCK_FLAG_LAST - 1)
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#define LOCK_MASK ((SHARE_ONE - 1) - FLAG_MASK)
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#define LOCK_FLAG_MASK (SHARE_ONE - 1)
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/* For backwards compatibility reasons we use the
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* guint and gpointer in the GstMiniObject struct in
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* a rather complicated way to store the parent(s) and qdata.
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* Originally the were just the number of qdatas and the qdata.
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*
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* The guint is used as an atomic state integer with the following
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* states:
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* - Locked: 0, basically a spinlock
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* - No parent, no qdata: 1 (pointer is NULL)
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* - One parent: 2 (pointer contains the parent)
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* - Multiple parents or qdata: 3 (pointer contains a PrivData struct)
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*
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* Unless we're in state 3, we always have to move to Locking state
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* atomically and release that again later to the target state whenever
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* accessing the pointer. When we're in state 3, we will never move to lower
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* states again
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*
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* FIXME 2.0: We should store this directly inside the struct, possibly
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* keeping space directly allocated for a couple of parents
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*/
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enum
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{
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PRIV_DATA_STATE_LOCKED = 0,
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PRIV_DATA_STATE_NO_PARENT = 1,
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PRIV_DATA_STATE_ONE_PARENT = 2,
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PRIV_DATA_STATE_PARENTS_OR_QDATA = 3,
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};
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typedef struct
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{
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GQuark quark;
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GstMiniObjectNotify notify;
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gpointer data;
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GDestroyNotify destroy;
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} GstQData;
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typedef struct
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{
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/* Atomic spinlock: 1 if locked, 0 otherwise */
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gint parent_lock;
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guint n_parents, n_parents_len;
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GstMiniObject **parents;
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guint n_qdata, n_qdata_len;
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GstQData *qdata;
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} PrivData;
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#define QDATA(q,i) (q->qdata)[(i)]
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#define QDATA_QUARK(o,i) (QDATA(o,i).quark)
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#define QDATA_NOTIFY(o,i) (QDATA(o,i).notify)
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#define QDATA_DATA(o,i) (QDATA(o,i).data)
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#define QDATA_DESTROY(o,i) (QDATA(o,i).destroy)
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void
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_priv_gst_mini_object_initialize (void)
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{
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weak_ref_quark = g_quark_from_static_string ("GstMiniObjectWeakRefQuark");
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}
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/**
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* gst_mini_object_init: (skip)
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* @mini_object: a #GstMiniObject
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* @flags: initial #GstMiniObjectFlags
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* @type: the #GType of the mini-object to create
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* @copy_func: (allow-none): the copy function, or %NULL
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* @dispose_func: (allow-none): the dispose function, or %NULL
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* @free_func: (allow-none): the free function or %NULL
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*
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* Initializes a mini-object with the desired type and copy/dispose/free
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* functions.
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*/
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void
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gst_mini_object_init (GstMiniObject * mini_object, guint flags, GType type,
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GstMiniObjectCopyFunction copy_func,
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GstMiniObjectDisposeFunction dispose_func,
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GstMiniObjectFreeFunction free_func)
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{
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mini_object->type = type;
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mini_object->refcount = 1;
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mini_object->lockstate = 0;
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mini_object->flags = flags;
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mini_object->copy = copy_func;
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mini_object->dispose = dispose_func;
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mini_object->free = free_func;
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g_atomic_int_set ((gint *) & mini_object->priv_uint,
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PRIV_DATA_STATE_NO_PARENT);
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mini_object->priv_pointer = NULL;
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GST_TRACER_MINI_OBJECT_CREATED (mini_object);
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}
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/**
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* gst_mini_object_copy: (skip)
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* @mini_object: the mini-object to copy
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*
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* Creates a copy of the mini-object.
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*
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* MT safe
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*
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* Returns: (transfer full) (nullable): the new mini-object if copying is
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* possible, %NULL otherwise.
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*/
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GstMiniObject *
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gst_mini_object_copy (const GstMiniObject * mini_object)
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{
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GstMiniObject *copy;
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g_return_val_if_fail (mini_object != NULL, NULL);
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if (mini_object->copy)
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copy = mini_object->copy (mini_object);
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else
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copy = NULL;
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return copy;
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}
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/**
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* gst_mini_object_lock:
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* @object: the mini-object to lock
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* @flags: #GstLockFlags
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*
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* Lock the mini-object with the specified access mode in @flags.
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*
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* Returns: %TRUE if @object could be locked.
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*/
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gboolean
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gst_mini_object_lock (GstMiniObject * object, GstLockFlags flags)
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{
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gint access_mode, state, newstate;
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g_return_val_if_fail (object != NULL, FALSE);
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g_return_val_if_fail (GST_MINI_OBJECT_IS_LOCKABLE (object), FALSE);
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if (G_UNLIKELY (object->flags & GST_MINI_OBJECT_FLAG_LOCK_READONLY &&
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flags & GST_LOCK_FLAG_WRITE))
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return FALSE;
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do {
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access_mode = flags & FLAG_MASK;
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newstate = state = g_atomic_int_get (&object->lockstate);
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GST_CAT_TRACE (GST_CAT_LOCKING, "lock %p: state %08x, access_mode %d",
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object, state, access_mode);
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if (access_mode & GST_LOCK_FLAG_EXCLUSIVE) {
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/* shared ref */
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newstate += SHARE_ONE;
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access_mode &= ~GST_LOCK_FLAG_EXCLUSIVE;
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}
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/* shared counter > 1 and write access is not allowed */
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if (((state & GST_LOCK_FLAG_WRITE) != 0
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|| (access_mode & GST_LOCK_FLAG_WRITE) != 0)
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&& IS_SHARED (newstate))
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goto lock_failed;
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if (access_mode) {
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if ((state & LOCK_FLAG_MASK) == 0) {
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/* nothing mapped, set access_mode */
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newstate |= access_mode;
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} else {
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/* access_mode must match */
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if ((state & access_mode) != access_mode)
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goto lock_failed;
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}
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/* increase refcount */
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newstate += LOCK_ONE;
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}
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} while (!g_atomic_int_compare_and_exchange (&object->lockstate, state,
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newstate));
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return TRUE;
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lock_failed:
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{
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GST_CAT_DEBUG (GST_CAT_LOCKING,
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"lock failed %p: state %08x, access_mode %d", object, state,
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access_mode);
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return FALSE;
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}
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}
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/**
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* gst_mini_object_unlock:
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* @object: the mini-object to unlock
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* @flags: #GstLockFlags
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*
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* Unlock the mini-object with the specified access mode in @flags.
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*/
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void
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gst_mini_object_unlock (GstMiniObject * object, GstLockFlags flags)
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{
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gint access_mode, state, newstate;
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g_return_if_fail (object != NULL);
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g_return_if_fail (GST_MINI_OBJECT_IS_LOCKABLE (object));
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do {
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access_mode = flags & FLAG_MASK;
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newstate = state = g_atomic_int_get (&object->lockstate);
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GST_CAT_TRACE (GST_CAT_LOCKING, "unlock %p: state %08x, access_mode %d",
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object, state, access_mode);
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if (access_mode & GST_LOCK_FLAG_EXCLUSIVE) {
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/* shared counter */
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g_return_if_fail (state >= SHARE_ONE);
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newstate -= SHARE_ONE;
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access_mode &= ~GST_LOCK_FLAG_EXCLUSIVE;
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}
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if (access_mode) {
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g_return_if_fail ((state & access_mode) == access_mode);
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/* decrease the refcount */
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newstate -= LOCK_ONE;
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/* last refcount, unset access_mode */
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if ((newstate & LOCK_FLAG_MASK) == access_mode)
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newstate &= ~LOCK_FLAG_MASK;
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}
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} while (!g_atomic_int_compare_and_exchange (&object->lockstate, state,
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newstate));
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}
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/* Locks the priv pointer and sets the priv uint to PRIV_DATA_STATE_LOCKED,
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* unless the full struct was already stored in the priv pointer.
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*
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* Returns the previous state of the priv uint
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*/
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static guint
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lock_priv_pointer (GstMiniObject * object)
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{
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gint priv_state = g_atomic_int_get ((gint *) & object->priv_uint);
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if (priv_state != PRIV_DATA_STATE_PARENTS_OR_QDATA) {
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/* As long as the struct was not allocated yet and either someone else
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* locked it or our priv_state is out of date, try to lock it */
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while (priv_state != PRIV_DATA_STATE_PARENTS_OR_QDATA &&
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(priv_state == PRIV_DATA_STATE_LOCKED ||
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!g_atomic_int_compare_and_exchange ((gint *) & object->priv_uint,
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priv_state, PRIV_DATA_STATE_LOCKED)))
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priv_state = g_atomic_int_get ((gint *) & object->priv_uint);
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/* Note that if we got the full struct, we did not store
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* PRIV_DATA_STATE_LOCKED and did not actually lock the priv pointer */
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}
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return priv_state;
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}
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/**
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* gst_mini_object_is_writable:
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* @mini_object: the mini-object to check
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*
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* If @mini_object has the LOCKABLE flag set, check if the current EXCLUSIVE
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* lock on @object is the only one, this means that changes to the object will
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* not be visible to any other object.
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*
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* If the LOCKABLE flag is not set, check if the refcount of @mini_object is
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* exactly 1, meaning that no other reference exists to the object and that the
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* object is therefore writable.
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*
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* Modification of a mini-object should only be done after verifying that it
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* is writable.
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*
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* Returns: %TRUE if the object is writable.
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*/
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gboolean
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gst_mini_object_is_writable (const GstMiniObject * mini_object)
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{
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gboolean result;
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gint priv_state;
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g_return_val_if_fail (mini_object != NULL, FALSE);
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/* Let's first check our own writability. If this already fails there's
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* no point in checking anything else */
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if (GST_MINI_OBJECT_IS_LOCKABLE (mini_object)) {
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result = !IS_SHARED (g_atomic_int_get (&mini_object->lockstate));
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} else {
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result = (GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) == 1);
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}
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if (!result)
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return result;
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/* We are writable ourselves, but are there parents and are they all
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* writable too? */
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priv_state = lock_priv_pointer (GST_MINI_OBJECT_CAST (mini_object));
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/* Now we either have to check the full struct and all the
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* parents in there, or if there is exactly one parent we
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* can check that one */
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if (priv_state == PRIV_DATA_STATE_PARENTS_OR_QDATA) {
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PrivData *priv_data = mini_object->priv_pointer;
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/* Lock parents */
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while (!g_atomic_int_compare_and_exchange (&priv_data->parent_lock, 0, 1));
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/* If we have one parent, we're only writable if that parent is writable.
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* Otherwise if we have multiple parents we are not writable, and if
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* we have no parent, we are writable */
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if (priv_data->n_parents == 1)
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result = gst_mini_object_is_writable (priv_data->parents[0]);
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else if (priv_data->n_parents == 0)
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result = TRUE;
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else
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result = FALSE;
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/* Unlock again */
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g_atomic_int_set (&priv_data->parent_lock, 0);
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} else {
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if (priv_state == PRIV_DATA_STATE_ONE_PARENT) {
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result = gst_mini_object_is_writable (mini_object->priv_pointer);
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} else {
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g_assert (priv_state == PRIV_DATA_STATE_NO_PARENT);
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result = TRUE;
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}
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/* Unlock again */
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g_atomic_int_set ((gint *) & mini_object->priv_uint, priv_state);
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}
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return result;
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}
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|
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/**
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* gst_mini_object_make_writable: (skip)
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* @mini_object: (transfer full): the mini-object to make writable
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*
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* Checks if a mini-object is writable. If not, a writable copy is made and
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* returned. This gives away the reference to the original mini object,
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* and returns a reference to the new object.
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*
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* MT safe
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*
|
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* Returns: (transfer full): a mini-object (possibly the same pointer) that
|
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* is writable.
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*/
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GstMiniObject *
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gst_mini_object_make_writable (GstMiniObject * mini_object)
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{
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GstMiniObject *ret;
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g_return_val_if_fail (mini_object != NULL, NULL);
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if (gst_mini_object_is_writable (mini_object)) {
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ret = mini_object;
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} else {
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ret = gst_mini_object_copy (mini_object);
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GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy %s miniobject %p -> %p",
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g_type_name (GST_MINI_OBJECT_TYPE (mini_object)), mini_object, ret);
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gst_mini_object_unref (mini_object);
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}
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return ret;
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}
|
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|
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/**
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* gst_mini_object_ref: (skip)
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* @mini_object: the mini-object
|
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*
|
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* Increase the reference count of the mini-object.
|
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*
|
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* Note that the refcount affects the writability
|
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* of @mini-object, see gst_mini_object_is_writable(). It is
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* important to note that keeping additional references to
|
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* GstMiniObject instances can potentially increase the number
|
|
* of memcpy operations in a pipeline, especially if the miniobject
|
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* is a #GstBuffer.
|
|
*
|
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* Returns: (transfer full): the mini-object.
|
|
*/
|
|
GstMiniObject *
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gst_mini_object_ref (GstMiniObject * mini_object)
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{
|
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gint old_refcount, new_refcount;
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|
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g_return_val_if_fail (mini_object != NULL, NULL);
|
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/* we can't assert that the refcount > 0 since the _free functions
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* increments the refcount from 0 to 1 again to allow resurrecting
|
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* the object
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g_return_val_if_fail (mini_object->refcount > 0, NULL);
|
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*/
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|
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old_refcount = g_atomic_int_add (&mini_object->refcount, 1);
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new_refcount = old_refcount + 1;
|
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|
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GST_CAT_TRACE (GST_CAT_REFCOUNTING, "%p ref %d->%d", mini_object,
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old_refcount, new_refcount);
|
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|
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GST_TRACER_MINI_OBJECT_REFFED (mini_object, new_refcount);
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|
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return mini_object;
|
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}
|
|
|
|
/* Called with global qdata lock */
|
|
static gint
|
|
find_notify (GstMiniObject * object, GQuark quark, gboolean match_notify,
|
|
GstMiniObjectNotify notify, gpointer data)
|
|
{
|
|
guint i;
|
|
gint priv_state = g_atomic_int_get ((gint *) & object->priv_uint);
|
|
PrivData *priv_data;
|
|
|
|
if (priv_state != PRIV_DATA_STATE_PARENTS_OR_QDATA)
|
|
return -1;
|
|
|
|
priv_data = object->priv_pointer;
|
|
|
|
for (i = 0; i < priv_data->n_qdata; i++) {
|
|
if (QDATA_QUARK (priv_data, i) == quark) {
|
|
/* check if we need to match the callback too */
|
|
if (!match_notify || (QDATA_NOTIFY (priv_data, i) == notify &&
|
|
QDATA_DATA (priv_data, i) == data))
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static void
|
|
remove_notify (GstMiniObject * object, gint index)
|
|
{
|
|
gint priv_state = g_atomic_int_get ((gint *) & object->priv_uint);
|
|
PrivData *priv_data;
|
|
|
|
g_assert (priv_state == PRIV_DATA_STATE_PARENTS_OR_QDATA);
|
|
priv_data = object->priv_pointer;
|
|
|
|
/* remove item */
|
|
priv_data->n_qdata--;
|
|
if (index != priv_data->n_qdata) {
|
|
QDATA (priv_data, index) = QDATA (priv_data, priv_data->n_qdata);
|
|
}
|
|
}
|
|
|
|
/* Make sure we allocate the PrivData of this object if not happened yet */
|
|
static void
|
|
ensure_priv_data (GstMiniObject * object)
|
|
{
|
|
gint priv_state;
|
|
PrivData *priv_data;
|
|
GstMiniObject *parent = NULL;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
|
|
"allocating private data %s miniobject %p",
|
|
g_type_name (GST_MINI_OBJECT_TYPE (object)), object);
|
|
|
|
priv_state = lock_priv_pointer (object);
|
|
if (priv_state == PRIV_DATA_STATE_PARENTS_OR_QDATA)
|
|
return;
|
|
|
|
/* Now we're either locked, or someone has already allocated the struct
|
|
* before us and we can just go ahead
|
|
*
|
|
* Note: if someone else allocated it in the meantime, we don't have to
|
|
* unlock as we didn't lock! */
|
|
if (priv_state != PRIV_DATA_STATE_PARENTS_OR_QDATA) {
|
|
if (priv_state == PRIV_DATA_STATE_ONE_PARENT)
|
|
parent = object->priv_pointer;
|
|
|
|
object->priv_pointer = priv_data = g_new0 (PrivData, 1);
|
|
|
|
if (parent) {
|
|
priv_data->parents = g_new (GstMiniObject *, 16);
|
|
priv_data->n_parents_len = 16;
|
|
priv_data->n_parents = 1;
|
|
priv_data->parents[0] = parent;
|
|
}
|
|
|
|
/* Unlock */
|
|
g_atomic_int_set ((gint *) & object->priv_uint,
|
|
PRIV_DATA_STATE_PARENTS_OR_QDATA);
|
|
}
|
|
}
|
|
|
|
static void
|
|
set_notify (GstMiniObject * object, gint index, GQuark quark,
|
|
GstMiniObjectNotify notify, gpointer data, GDestroyNotify destroy)
|
|
{
|
|
PrivData *priv_data;
|
|
|
|
ensure_priv_data (object);
|
|
priv_data = object->priv_pointer;
|
|
|
|
if (index == -1) {
|
|
/* add item */
|
|
index = priv_data->n_qdata++;
|
|
if (index >= priv_data->n_qdata_len) {
|
|
priv_data->n_qdata_len *= 2;
|
|
if (priv_data->n_qdata_len == 0)
|
|
priv_data->n_qdata_len = 16;
|
|
|
|
priv_data->qdata =
|
|
g_realloc (priv_data->qdata,
|
|
sizeof (GstQData) * priv_data->n_qdata_len);
|
|
}
|
|
}
|
|
|
|
QDATA_QUARK (priv_data, index) = quark;
|
|
QDATA_NOTIFY (priv_data, index) = notify;
|
|
QDATA_DATA (priv_data, index) = data;
|
|
QDATA_DESTROY (priv_data, index) = destroy;
|
|
}
|
|
|
|
static void
|
|
free_priv_data (GstMiniObject * obj)
|
|
{
|
|
guint i;
|
|
gint priv_state = g_atomic_int_get ((gint *) & obj->priv_uint);
|
|
PrivData *priv_data;
|
|
|
|
if (priv_state != PRIV_DATA_STATE_PARENTS_OR_QDATA) {
|
|
if (priv_state == PRIV_DATA_STATE_LOCKED) {
|
|
g_warning
|
|
("%s: object finalizing but has locked private data (object:%p)",
|
|
G_STRFUNC, obj);
|
|
} else if (priv_state == PRIV_DATA_STATE_ONE_PARENT) {
|
|
g_warning
|
|
("%s: object finalizing but still has parent (object:%p, parent:%p)",
|
|
G_STRFUNC, obj, obj->priv_pointer);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
priv_data = obj->priv_pointer;
|
|
|
|
for (i = 0; i < priv_data->n_qdata; i++) {
|
|
if (QDATA_QUARK (priv_data, i) == weak_ref_quark)
|
|
QDATA_NOTIFY (priv_data, i) (QDATA_DATA (priv_data, i), obj);
|
|
if (QDATA_DESTROY (priv_data, i))
|
|
QDATA_DESTROY (priv_data, i) (QDATA_DATA (priv_data, i));
|
|
}
|
|
g_free (priv_data->qdata);
|
|
|
|
if (priv_data->n_parents)
|
|
g_warning ("%s: object finalizing but still has %d parents (object:%p)",
|
|
G_STRFUNC, priv_data->n_parents, obj);
|
|
g_free (priv_data->parents);
|
|
|
|
g_free (priv_data);
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_unref: (skip)
|
|
* @mini_object: the mini-object
|
|
*
|
|
* Decreases the reference count of the mini-object, possibly freeing
|
|
* the mini-object.
|
|
*/
|
|
void
|
|
gst_mini_object_unref (GstMiniObject * mini_object)
|
|
{
|
|
gint old_refcount, new_refcount;
|
|
|
|
g_return_if_fail (mini_object != NULL);
|
|
g_return_if_fail (GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0);
|
|
|
|
old_refcount = g_atomic_int_add (&mini_object->refcount, -1);
|
|
new_refcount = old_refcount - 1;
|
|
|
|
g_return_if_fail (old_refcount > 0);
|
|
|
|
GST_CAT_TRACE (GST_CAT_REFCOUNTING, "%p unref %d->%d",
|
|
mini_object, old_refcount, new_refcount);
|
|
|
|
GST_TRACER_MINI_OBJECT_UNREFFED (mini_object, new_refcount);
|
|
|
|
if (new_refcount == 0) {
|
|
gboolean do_free;
|
|
|
|
if (mini_object->dispose)
|
|
do_free = mini_object->dispose (mini_object);
|
|
else
|
|
do_free = TRUE;
|
|
|
|
/* if the subclass recycled the object (and returned FALSE) we don't
|
|
* want to free the instance anymore */
|
|
if (G_LIKELY (do_free)) {
|
|
/* there should be no outstanding locks */
|
|
g_return_if_fail ((g_atomic_int_get (&mini_object->lockstate) & LOCK_MASK)
|
|
< 4);
|
|
|
|
free_priv_data (mini_object);
|
|
|
|
GST_TRACER_MINI_OBJECT_DESTROYED (mini_object);
|
|
if (mini_object->free)
|
|
mini_object->free (mini_object);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_clear_mini_object: (skip)
|
|
* @object_ptr: a pointer to a #GstMiniObject reference
|
|
*
|
|
* Clears a reference to a #GstMiniObject.
|
|
*
|
|
* @object_ptr must not be %NULL.
|
|
*
|
|
* If the reference is %NULL then this function does nothing.
|
|
* Otherwise, the reference count of the object is decreased using
|
|
* gst_mini_object_unref() and the pointer is set to %NULL.
|
|
*
|
|
* A macro is also included that allows this function to be used without
|
|
* pointer casts.
|
|
*
|
|
* Since: 1.16
|
|
**/
|
|
#undef gst_clear_mini_object
|
|
void
|
|
gst_clear_mini_object (GstMiniObject ** object_ptr)
|
|
{
|
|
g_clear_pointer (object_ptr, gst_mini_object_unref);
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_replace:
|
|
* @olddata: (inout) (transfer full) (nullable): pointer to a pointer to a
|
|
* mini-object to be replaced
|
|
* @newdata: (allow-none): pointer to new mini-object
|
|
*
|
|
* Atomically modifies a pointer to point to a new mini-object.
|
|
* The reference count of @olddata is decreased and the reference count of
|
|
* @newdata is increased.
|
|
*
|
|
* Either @newdata and the value pointed to by @olddata may be %NULL.
|
|
*
|
|
* Returns: %TRUE if @newdata was different from @olddata
|
|
*/
|
|
gboolean
|
|
gst_mini_object_replace (GstMiniObject ** olddata, GstMiniObject * newdata)
|
|
{
|
|
GstMiniObject *olddata_val;
|
|
|
|
g_return_val_if_fail (olddata != NULL, FALSE);
|
|
|
|
GST_CAT_TRACE (GST_CAT_REFCOUNTING, "replace %p (%d) with %p (%d)",
|
|
*olddata, *olddata ? (*olddata)->refcount : 0,
|
|
newdata, newdata ? newdata->refcount : 0);
|
|
|
|
olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
|
|
|
|
if (G_UNLIKELY (olddata_val == newdata))
|
|
return FALSE;
|
|
|
|
if (newdata)
|
|
gst_mini_object_ref (newdata);
|
|
|
|
while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
|
|
olddata, olddata_val, newdata))) {
|
|
olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
|
|
if (G_UNLIKELY (olddata_val == newdata))
|
|
break;
|
|
}
|
|
|
|
if (olddata_val)
|
|
gst_mini_object_unref (olddata_val);
|
|
|
|
return olddata_val != newdata;
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_steal: (skip)
|
|
* @olddata: (inout) (transfer full): pointer to a pointer to a mini-object to
|
|
* be stolen
|
|
*
|
|
* Replace the current #GstMiniObject pointer to by @olddata with %NULL and
|
|
* return the old value.
|
|
*
|
|
* Returns: (nullable): the #GstMiniObject at @oldata
|
|
*/
|
|
GstMiniObject *
|
|
gst_mini_object_steal (GstMiniObject ** olddata)
|
|
{
|
|
GstMiniObject *olddata_val;
|
|
|
|
g_return_val_if_fail (olddata != NULL, NULL);
|
|
|
|
GST_CAT_TRACE (GST_CAT_REFCOUNTING, "steal %p (%d)",
|
|
*olddata, *olddata ? (*olddata)->refcount : 0);
|
|
|
|
do {
|
|
olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
|
|
if (olddata_val == NULL)
|
|
break;
|
|
} while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
|
|
olddata, olddata_val, NULL)));
|
|
|
|
return olddata_val;
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_take:
|
|
* @olddata: (inout) (transfer full): pointer to a pointer to a mini-object to
|
|
* be replaced
|
|
* @newdata: pointer to new mini-object
|
|
*
|
|
* Modifies a pointer to point to a new mini-object. The modification
|
|
* is done atomically. This version is similar to gst_mini_object_replace()
|
|
* except that it does not increase the refcount of @newdata and thus
|
|
* takes ownership of @newdata.
|
|
*
|
|
* Either @newdata and the value pointed to by @olddata may be %NULL.
|
|
*
|
|
* Returns: %TRUE if @newdata was different from @olddata
|
|
*/
|
|
gboolean
|
|
gst_mini_object_take (GstMiniObject ** olddata, GstMiniObject * newdata)
|
|
{
|
|
GstMiniObject *olddata_val;
|
|
|
|
g_return_val_if_fail (olddata != NULL, FALSE);
|
|
|
|
GST_CAT_TRACE (GST_CAT_REFCOUNTING, "take %p (%d) with %p (%d)",
|
|
*olddata, *olddata ? (*olddata)->refcount : 0,
|
|
newdata, newdata ? newdata->refcount : 0);
|
|
|
|
do {
|
|
olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
|
|
if (G_UNLIKELY (olddata_val == newdata))
|
|
break;
|
|
} while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
|
|
olddata, olddata_val, newdata)));
|
|
|
|
if (olddata_val)
|
|
gst_mini_object_unref (olddata_val);
|
|
|
|
return olddata_val != newdata;
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_weak_ref: (skip)
|
|
* @object: #GstMiniObject to reference weakly
|
|
* @notify: callback to invoke before the mini object is freed
|
|
* @data: extra data to pass to notify
|
|
*
|
|
* Adds a weak reference callback to a mini object. Weak references are
|
|
* used for notification when a mini object is finalized. They are called
|
|
* "weak references" because they allow you to safely hold a pointer
|
|
* to the mini object without calling gst_mini_object_ref()
|
|
* (gst_mini_object_ref() adds a strong reference, that is, forces the object
|
|
* to stay alive).
|
|
*/
|
|
void
|
|
gst_mini_object_weak_ref (GstMiniObject * object,
|
|
GstMiniObjectNotify notify, gpointer data)
|
|
{
|
|
g_return_if_fail (object != NULL);
|
|
g_return_if_fail (notify != NULL);
|
|
g_return_if_fail (GST_MINI_OBJECT_REFCOUNT_VALUE (object) >= 1);
|
|
|
|
G_LOCK (qdata_mutex);
|
|
set_notify (object, -1, weak_ref_quark, notify, data, NULL);
|
|
G_UNLOCK (qdata_mutex);
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_weak_unref: (skip)
|
|
* @object: #GstMiniObject to remove a weak reference from
|
|
* @notify: callback to search for
|
|
* @data: data to search for
|
|
*
|
|
* Removes a weak reference callback from a mini object.
|
|
*/
|
|
void
|
|
gst_mini_object_weak_unref (GstMiniObject * object,
|
|
GstMiniObjectNotify notify, gpointer data)
|
|
{
|
|
gint i;
|
|
|
|
g_return_if_fail (object != NULL);
|
|
g_return_if_fail (notify != NULL);
|
|
|
|
G_LOCK (qdata_mutex);
|
|
if ((i = find_notify (object, weak_ref_quark, TRUE, notify, data)) != -1) {
|
|
remove_notify (object, i);
|
|
} else {
|
|
g_warning ("%s: couldn't find weak ref %p (object:%p data:%p)", G_STRFUNC,
|
|
notify, object, data);
|
|
}
|
|
G_UNLOCK (qdata_mutex);
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_set_qdata:
|
|
* @object: a #GstMiniObject
|
|
* @quark: A #GQuark, naming the user data pointer
|
|
* @data: An opaque user data pointer
|
|
* @destroy: Function to invoke with @data as argument, when @data
|
|
* needs to be freed
|
|
*
|
|
* This sets an opaque, named pointer on a miniobject.
|
|
* The name is specified through a #GQuark (retrieved e.g. via
|
|
* g_quark_from_static_string()), and the pointer
|
|
* can be gotten back from the @object with gst_mini_object_get_qdata()
|
|
* until the @object is disposed.
|
|
* Setting a previously set user data pointer, overrides (frees)
|
|
* the old pointer set, using %NULL as pointer essentially
|
|
* removes the data stored.
|
|
*
|
|
* @destroy may be specified which is called with @data as argument
|
|
* when the @object is disposed, or the data is being overwritten by
|
|
* a call to gst_mini_object_set_qdata() with the same @quark.
|
|
*/
|
|
void
|
|
gst_mini_object_set_qdata (GstMiniObject * object, GQuark quark,
|
|
gpointer data, GDestroyNotify destroy)
|
|
{
|
|
gint i;
|
|
gpointer old_data = NULL;
|
|
GDestroyNotify old_notify = NULL;
|
|
|
|
g_return_if_fail (object != NULL);
|
|
g_return_if_fail (quark > 0);
|
|
|
|
G_LOCK (qdata_mutex);
|
|
if ((i = find_notify (object, quark, FALSE, NULL, NULL)) != -1) {
|
|
PrivData *priv_data = object->priv_pointer;
|
|
|
|
old_data = QDATA_DATA (priv_data, i);
|
|
old_notify = QDATA_DESTROY (priv_data, i);
|
|
|
|
if (data == NULL)
|
|
remove_notify (object, i);
|
|
}
|
|
if (data != NULL)
|
|
set_notify (object, i, quark, NULL, data, destroy);
|
|
G_UNLOCK (qdata_mutex);
|
|
|
|
if (old_notify)
|
|
old_notify (old_data);
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_get_qdata:
|
|
* @object: The GstMiniObject to get a stored user data pointer from
|
|
* @quark: A #GQuark, naming the user data pointer
|
|
*
|
|
* This function gets back user data pointers stored via
|
|
* gst_mini_object_set_qdata().
|
|
*
|
|
* Returns: (transfer none) (nullable): The user data pointer set, or
|
|
* %NULL
|
|
*/
|
|
gpointer
|
|
gst_mini_object_get_qdata (GstMiniObject * object, GQuark quark)
|
|
{
|
|
guint i;
|
|
gpointer result;
|
|
|
|
g_return_val_if_fail (object != NULL, NULL);
|
|
g_return_val_if_fail (quark > 0, NULL);
|
|
|
|
G_LOCK (qdata_mutex);
|
|
if ((i = find_notify (object, quark, FALSE, NULL, NULL)) != -1) {
|
|
PrivData *priv_data = object->priv_pointer;
|
|
result = QDATA_DATA (priv_data, i);
|
|
} else {
|
|
result = NULL;
|
|
}
|
|
G_UNLOCK (qdata_mutex);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_mini_object_steal_qdata:
|
|
* @object: The GstMiniObject to get a stored user data pointer from
|
|
* @quark: A #GQuark, naming the user data pointer
|
|
*
|
|
* This function gets back user data pointers stored via gst_mini_object_set_qdata()
|
|
* and removes the data from @object without invoking its `destroy()` function (if
|
|
* any was set).
|
|
*
|
|
* Returns: (transfer full) (nullable): The user data pointer set, or
|
|
* %NULL
|
|
*/
|
|
gpointer
|
|
gst_mini_object_steal_qdata (GstMiniObject * object, GQuark quark)
|
|
{
|
|
guint i;
|
|
gpointer result;
|
|
|
|
g_return_val_if_fail (object != NULL, NULL);
|
|
g_return_val_if_fail (quark > 0, NULL);
|
|
|
|
G_LOCK (qdata_mutex);
|
|
if ((i = find_notify (object, quark, FALSE, NULL, NULL)) != -1) {
|
|
PrivData *priv_data = object->priv_pointer;
|
|
result = QDATA_DATA (priv_data, i);
|
|
remove_notify (object, i);
|
|
} else {
|
|
result = NULL;
|
|
}
|
|
G_UNLOCK (qdata_mutex);
|
|
|
|
return result;
|
|
}
|
|
|
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/**
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* gst_mini_object_add_parent:
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* @object: a #GstMiniObject
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* @parent: a parent #GstMiniObject
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*
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* This adds @parent as a parent for @object. Having one ore more parents affects the
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* writability of @object: if a @parent is not writable, @object is also not
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* writable, regardless of its refcount. @object is only writable if all
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* the parents are writable and its own refcount is exactly 1.
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*
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* Note: This function does not take ownership of @parent and also does not
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* take an additional reference. It is the responsibility of the caller to
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* remove the parent again at a later time.
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*
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* Since: 1.16
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*/
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void
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gst_mini_object_add_parent (GstMiniObject * object, GstMiniObject * parent)
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{
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gint priv_state;
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g_return_if_fail (object != NULL);
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GST_CAT_TRACE (GST_CAT_REFCOUNTING, "adding parent %p to object %p", parent,
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object);
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priv_state = lock_priv_pointer (object);
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/* If we already had one parent, we need to allocate the full struct now */
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if (priv_state == PRIV_DATA_STATE_ONE_PARENT) {
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/* Unlock again */
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g_atomic_int_set ((gint *) & object->priv_uint, priv_state);
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ensure_priv_data (object);
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priv_state = PRIV_DATA_STATE_PARENTS_OR_QDATA;
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}
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/* Now we either have to add the new parent to the full struct, or add
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* our one and only parent to the pointer field */
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if (priv_state == PRIV_DATA_STATE_PARENTS_OR_QDATA) {
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PrivData *priv_data = object->priv_pointer;
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/* Lock parents */
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while (!g_atomic_int_compare_and_exchange (&priv_data->parent_lock, 0, 1));
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if (priv_data->n_parents >= priv_data->n_parents_len) {
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priv_data->n_parents_len *= 2;
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if (priv_data->n_parents_len == 0)
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priv_data->n_parents_len = 16;
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priv_data->parents =
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g_realloc (priv_data->parents,
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priv_data->n_parents_len * sizeof (GstMiniObject *));
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}
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priv_data->parents[priv_data->n_parents] = parent;
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priv_data->n_parents++;
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/* Unlock again */
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g_atomic_int_set (&priv_data->parent_lock, 0);
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} else if (priv_state == PRIV_DATA_STATE_NO_PARENT) {
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object->priv_pointer = parent;
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/* Unlock again */
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g_atomic_int_set ((gint *) & object->priv_uint, PRIV_DATA_STATE_ONE_PARENT);
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} else {
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g_assert_not_reached ();
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}
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}
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/**
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* gst_mini_object_remove_parent:
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* @object: a #GstMiniObject
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* @parent: a parent #GstMiniObject
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*
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* This removes @parent as a parent for @object. See
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* gst_mini_object_add_parent().
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*
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* Since: 1.16
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*/
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void
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gst_mini_object_remove_parent (GstMiniObject * object, GstMiniObject * parent)
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{
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gint priv_state;
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g_return_if_fail (object != NULL);
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GST_CAT_TRACE (GST_CAT_REFCOUNTING, "removing parent %p from object %p",
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parent, object);
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priv_state = lock_priv_pointer (object);
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/* Now we either have to add the new parent to the full struct, or add
|
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* our one and only parent to the pointer field */
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if (priv_state == PRIV_DATA_STATE_PARENTS_OR_QDATA) {
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PrivData *priv_data = object->priv_pointer;
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guint i;
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/* Lock parents */
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while (!g_atomic_int_compare_and_exchange (&priv_data->parent_lock, 0, 1));
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for (i = 0; i < priv_data->n_parents; i++)
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if (parent == priv_data->parents[i])
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break;
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if (i != priv_data->n_parents) {
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priv_data->n_parents--;
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if (priv_data->n_parents != i)
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priv_data->parents[i] = priv_data->parents[priv_data->n_parents];
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} else {
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g_warning ("%s: couldn't find parent %p (object:%p)", G_STRFUNC,
|
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object, parent);
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}
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/* Unlock again */
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g_atomic_int_set (&priv_data->parent_lock, 0);
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} else if (priv_state == PRIV_DATA_STATE_ONE_PARENT) {
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if (object->priv_pointer != parent) {
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g_warning ("%s: couldn't find parent %p (object:%p)", G_STRFUNC,
|
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object, parent);
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/* Unlock again */
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g_atomic_int_set ((gint *) & object->priv_uint, priv_state);
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} else {
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object->priv_pointer = NULL;
|
|
/* Unlock again */
|
|
g_atomic_int_set ((gint *) & object->priv_uint,
|
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PRIV_DATA_STATE_NO_PARENT);
|
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}
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} else {
|
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/* Unlock again */
|
|
g_atomic_int_set ((gint *) & object->priv_uint, PRIV_DATA_STATE_NO_PARENT);
|
|
}
|
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}
|