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7e69305657
This is based on g_clear_object(). Basically, you can use this instead of using gst_mini_object_unref (which needs to be preceded by a NULL-check). Also fixes #275
308 lines
9.8 KiB
C
308 lines
9.8 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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#ifndef __GST_MINI_OBJECT_H__
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#define __GST_MINI_OBJECT_H__
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#include <gst/gstconfig.h>
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#include <glib-object.h>
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G_BEGIN_DECLS
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#define GST_IS_MINI_OBJECT_TYPE(obj,type) ((obj) && GST_MINI_OBJECT_TYPE(obj) == (type))
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#define GST_MINI_OBJECT_CAST(obj) ((GstMiniObject*)(obj))
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#define GST_MINI_OBJECT_CONST_CAST(obj) ((const GstMiniObject*)(obj))
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#define GST_MINI_OBJECT(obj) (GST_MINI_OBJECT_CAST(obj))
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typedef struct _GstMiniObject GstMiniObject;
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/**
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* GstMiniObjectCopyFunction:
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* @obj: MiniObject to copy
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*
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* Function prototype for methods to create copies of instances.
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*
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* Returns: reference to cloned instance.
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*/
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typedef GstMiniObject * (*GstMiniObjectCopyFunction) (const GstMiniObject *obj);
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/**
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* GstMiniObjectDisposeFunction:
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* @obj: MiniObject to dispose
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*
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* Function prototype for when a miniobject has lost its last refcount.
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* Implementation of the mini object are allowed to revive the
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* passed object by doing a gst_mini_object_ref(). If the object is not
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* revived after the dispose function, the function should return %TRUE
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* and the memory associated with the object is freed.
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*
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* Returns: %TRUE if the object should be cleaned up.
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*/
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typedef gboolean (*GstMiniObjectDisposeFunction) (GstMiniObject *obj);
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/**
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* GstMiniObjectFreeFunction:
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* @obj: MiniObject to free
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*
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* Virtual function prototype for methods to free resources used by
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* mini-objects.
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*/
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typedef void (*GstMiniObjectFreeFunction) (GstMiniObject *obj);
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/**
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* GstMiniObjectNotify:
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* @user_data: data that was provided when the notify was added
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* @obj: the mini object
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*
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* A #GstMiniObjectNotify function can be added to a mini object as a
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* callback that gets triggered when gst_mini_object_unref() drops the
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* last ref and @obj is about to be freed.
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*/
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typedef void (*GstMiniObjectNotify) (gpointer user_data, GstMiniObject * obj);
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/**
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* GST_MINI_OBJECT_TYPE:
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* @obj: MiniObject to return type for.
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*
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* This macro returns the type of the mini-object.
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*/
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#define GST_MINI_OBJECT_TYPE(obj) (GST_MINI_OBJECT_CAST(obj)->type)
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/**
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* GST_MINI_OBJECT_FLAGS:
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* @obj: MiniObject to return flags for.
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*
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* This macro returns the entire set of flags for the mini-object.
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*/
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#define GST_MINI_OBJECT_FLAGS(obj) (GST_MINI_OBJECT_CAST(obj)->flags)
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/**
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* GST_MINI_OBJECT_FLAG_IS_SET:
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* @obj: MiniObject to check for flags.
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* @flag: Flag to check for
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*
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* This macro checks to see if the given flag is set.
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*/
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#define GST_MINI_OBJECT_FLAG_IS_SET(obj,flag) !!(GST_MINI_OBJECT_FLAGS (obj) & (flag))
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/**
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* GST_MINI_OBJECT_FLAG_SET:
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* @obj: MiniObject to set flag in.
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* @flag: Flag to set, can by any number of bits in guint32.
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*
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* This macro sets the given bits.
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*/
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#define GST_MINI_OBJECT_FLAG_SET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) |= (flag))
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/**
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* GST_MINI_OBJECT_FLAG_UNSET:
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* @obj: MiniObject to unset flag in.
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* @flag: Flag to set, must be a single bit in guint32.
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*
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* This macro unsets the given bits.
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*/
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#define GST_MINI_OBJECT_FLAG_UNSET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) &= ~(flag))
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/**
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* GstMiniObjectFlags:
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* @GST_MINI_OBJECT_FLAG_LOCKABLE: the object can be locked and unlocked with
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* gst_mini_object_lock() and gst_mini_object_unlock().
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* @GST_MINI_OBJECT_FLAG_LOCK_READONLY: the object is permanently locked in
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* READONLY mode. Only read locks can be performed on the object.
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* @GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED: the object is expected to stay alive
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* even after gst_deinit() has been called and so should be ignored by leak
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* detection tools. (Since 1.10)
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* @GST_MINI_OBJECT_FLAG_LAST: first flag that can be used by subclasses.
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*
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* Flags for the mini object
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*/
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typedef enum
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{
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GST_MINI_OBJECT_FLAG_LOCKABLE = (1 << 0),
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GST_MINI_OBJECT_FLAG_LOCK_READONLY = (1 << 1),
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GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED = (1 << 2),
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/* padding */
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GST_MINI_OBJECT_FLAG_LAST = (1 << 4)
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} GstMiniObjectFlags;
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/**
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* GST_MINI_OBJECT_IS_LOCKABLE:
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* @obj: a #GstMiniObject
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*
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* Check if @obj is lockable. A lockable object can be locked and unlocked with
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* gst_mini_object_lock() and gst_mini_object_unlock().
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*/
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#define GST_MINI_OBJECT_IS_LOCKABLE(obj) GST_MINI_OBJECT_FLAG_IS_SET(obj, GST_MINI_OBJECT_FLAG_LOCKABLE)
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/**
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* GstLockFlags:
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* @GST_LOCK_FLAG_READ: lock for read access
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* @GST_LOCK_FLAG_WRITE: lock for write access
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* @GST_LOCK_FLAG_EXCLUSIVE: lock for exclusive access
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* @GST_LOCK_FLAG_LAST: first flag that can be used for custom purposes
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*
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* Flags used when locking miniobjects
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*/
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typedef enum {
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GST_LOCK_FLAG_READ = (1 << 0),
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GST_LOCK_FLAG_WRITE = (1 << 1),
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GST_LOCK_FLAG_EXCLUSIVE = (1 << 2),
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GST_LOCK_FLAG_LAST = (1 << 8)
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} GstLockFlags;
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/**
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* GST_LOCK_FLAG_READWRITE: (value 3) (type GstLockFlags)
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*
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* GstLockFlags value alias for GST_LOCK_FLAG_READ | GST_LOCK_FLAG_WRITE
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*/
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#define GST_LOCK_FLAG_READWRITE ((GstLockFlags) (GST_LOCK_FLAG_READ | GST_LOCK_FLAG_WRITE))
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/**
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* GST_MINI_OBJECT_REFCOUNT:
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* @obj: a #GstMiniObject
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*
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* Get access to the reference count field of the mini-object.
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*/
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#define GST_MINI_OBJECT_REFCOUNT(obj) ((GST_MINI_OBJECT_CAST(obj))->refcount)
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/**
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* GST_MINI_OBJECT_REFCOUNT_VALUE:
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* @obj: a #GstMiniObject
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*
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* Get the reference count value of the mini-object.
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*/
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#define GST_MINI_OBJECT_REFCOUNT_VALUE(obj) (g_atomic_int_get (&(GST_MINI_OBJECT_CAST(obj))->refcount))
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/**
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* GstMiniObject: (ref-func gst_mini_object_ref) (unref-func gst_mini_object_unref) (set-value-func g_value_set_boxed) (get-value-func g_value_get_boxed)
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* @type: the GType of the object
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* @refcount: atomic refcount
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* @lockstate: atomic state of the locks
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* @flags: extra flags.
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* @copy: a copy function
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* @dispose: a dispose function
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* @free: the free function
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*
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* Base class for refcounted lightweight objects.
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*/
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struct _GstMiniObject {
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GType type;
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/*< public >*/ /* with COW */
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gint refcount;
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gint lockstate;
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guint flags;
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GstMiniObjectCopyFunction copy;
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GstMiniObjectDisposeFunction dispose;
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GstMiniObjectFreeFunction free;
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/* < private > */
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/* Used to keep track of parents, weak ref notifies and qdata */
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guint priv_uint;
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gpointer priv_pointer;
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};
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GST_API
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void gst_mini_object_init (GstMiniObject *mini_object,
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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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/* refcounting */
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GST_API
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GstMiniObject * gst_mini_object_ref (GstMiniObject *mini_object);
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GST_API
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void gst_mini_object_unref (GstMiniObject *mini_object);
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GST_API
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void gst_clear_mini_object (volatile GstMiniObject **object_ptr);
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#define gst_clear_mini_object(object_ptr) g_clear_pointer ((object_ptr), gst_mini_object_unref)
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GST_API
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void gst_mini_object_weak_ref (GstMiniObject *object,
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GstMiniObjectNotify notify,
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gpointer data);
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GST_API
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void gst_mini_object_weak_unref (GstMiniObject *object,
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GstMiniObjectNotify notify,
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gpointer data);
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/* locking */
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GST_API
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gboolean gst_mini_object_lock (GstMiniObject *object, GstLockFlags flags);
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GST_API
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void gst_mini_object_unlock (GstMiniObject *object, GstLockFlags flags);
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GST_API
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gboolean gst_mini_object_is_writable (const GstMiniObject *mini_object);
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GST_API
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GstMiniObject * gst_mini_object_make_writable (GstMiniObject *mini_object) G_GNUC_WARN_UNUSED_RESULT;
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/* copy */
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GST_API
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GstMiniObject * gst_mini_object_copy (const GstMiniObject *mini_object) G_GNUC_MALLOC G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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void gst_mini_object_set_qdata (GstMiniObject *object, GQuark quark,
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gpointer data, GDestroyNotify destroy);
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GST_API
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gpointer gst_mini_object_get_qdata (GstMiniObject *object, GQuark quark);
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GST_API
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gpointer gst_mini_object_steal_qdata (GstMiniObject *object, GQuark quark);
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GST_API
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void gst_mini_object_add_parent (GstMiniObject *object, GstMiniObject *parent);
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GST_API
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void gst_mini_object_remove_parent (GstMiniObject *object, GstMiniObject *parent);
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GST_API
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gboolean gst_mini_object_replace (GstMiniObject **olddata, GstMiniObject *newdata);
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GST_API
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gboolean gst_mini_object_take (GstMiniObject **olddata, GstMiniObject *newdata);
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GST_API
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GstMiniObject * gst_mini_object_steal (GstMiniObject **olddata) G_GNUC_WARN_UNUSED_RESULT;
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/**
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* GST_DEFINE_MINI_OBJECT_TYPE:
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* @TypeName: name of the new type in CamelCase
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* @type_name: name of the new type
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*
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* Define a new mini-object type with the given name
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*/
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#define GST_DEFINE_MINI_OBJECT_TYPE(TypeName,type_name) \
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G_DEFINE_BOXED_TYPE(TypeName,type_name, \
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(GBoxedCopyFunc) gst_mini_object_ref, \
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(GBoxedFreeFunc) gst_mini_object_unref)
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G_END_DECLS
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#endif
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