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/* object.c - Threads safe version of functions from GObject.
* Copyright (C) 2002 Evgeny Chukreev <codedj@echo.ru>
*
* This file is part of AlsaPlayer.
*
* AlsaPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* AlsaPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <glib-object.h>
#include "object.h"
/* --- prototypes --- */
static void ap_object_class_init (ApObjectClass *class);
static void ap_object_init (ApObject *object);
static void ap_object_finalize (GObject *object);
/* --- variables --- */
static gpointer parent_class = NULL;
static GStaticMutex ref_mutex = G_STATIC_MUTEX_INIT;
/* --- functions --- */
static void
ap_object_class_init (ApObjectClass *class)
{
/* Like aliases */
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
/* Peek parent class */
parent_class = g_type_class_peek_parent (class);
/* Init GObject Class */
gobject_class->finalize = ap_object_finalize;
} /* ap_object_class_init */
static void
ap_object_init (ApObject *object)
{
/* Local reference counter */
object->ref = 1;
/* Init mutex for this item */
g_static_rec_mutex_init (&object->mutex);
} /* ap_object_init() */
static void
ap_object_finalize (GObject *gobject)
{
ApObject *object = AP_OBJECT (gobject);
/* Destroy local mutex */
g_static_rec_mutex_free (&object->mutex);
G_OBJECT_CLASS (parent_class)->finalize (gobject);
} /* ap_object_finalize */
/* ******************************************************************** */
/* Public functions. */
/**
* @brief Register the #ApObjectClass if necessary,
* and returns the type ID associated to it.
*
* @return The type ID of the #ApObjectClass.
**/
GType
ap_object_get_type (void)
{
static GType type = 0;
static const GTypeInfo object_info = {
sizeof (ApObjectClass),
NULL,
NULL,
(GClassInitFunc) ap_object_class_init,
NULL,
NULL,
sizeof (ApObject),
0,
(GInstanceInitFunc) ap_object_init,
NULL
};
if (!type) {
/* First time create */
type = g_type_register_static (G_TYPE_OBJECT, /* Parent Type */
"ApObject", /* Name */
&object_info, /* Type Info */
0); /* Flags */
}
return type;
}; /* ap_object_get_type */
/**
* @param object An #ApObject.
*
* @brief Adds a reference to the given object.
*
* This function is the thread safe version of the g_object_ref().
*
* @see ap_object_unref()
**/
void
ap_object_ref (ApObject *object)
{
g_return_if_fail (AP_IS_OBJECT (object));
g_static_mutex_lock (&ref_mutex);
object->ref++;
g_static_mutex_unlock (&ref_mutex);
}
/**
* @param object An #ApObject.
*
* @brief Inverse of ap_object_unref().
*
* This functions is the thread safe version of the g_object_unref().
*
* @see ap_object_ref()
**/
void
ap_object_unref (ApObject *object)
{
g_return_if_fail (AP_IS_OBJECT (object));
g_static_mutex_lock (&ref_mutex);
if (object->ref == 1) {
g_static_mutex_unlock (&ref_mutex);
g_object_unref (object);
} else {
object->ref--;
g_static_mutex_unlock (&ref_mutex);
}
}
/**
* @param object An #ApObject.
*
* @brief Locks object.
*
* If object is already locked by another thread,
* the current thread will block until object
* in unlocked by the other thread.
*
* @note Object can be locked multiple times
* by one thread. If you enter it n times
* you have to unlock it n times again
* to let other threads lock it.
*
* @see ap_object_unlock()
**/
void
ap_object_lock (ApObject *object)
{
g_return_if_fail (AP_IS_OBJECT (object));
g_static_rec_mutex_lock (&object->mutex);
} /* ap_object_lock */
/**
* @param object An #ApObject.
*
* @brief Unlocks object.
*
* If another thread is blocked in a ap_object_lock()
* call for object, it will be woken and can lock object itself.
*
* @note Object can be locked multiple times
* by one thread. If you enter it n times
* you have to unlock it n times again
* to let other threads lock it.
*
* @see ap_object_lock()
**/
void
ap_object_unlock (ApObject *object)
{
g_return_if_fail (AP_IS_OBJECT (object));
g_static_rec_mutex_unlock (&object->mutex);
} /* ap_object_lock */
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