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// GLib.ToggleRef.cs - GLib ToggleRef class implementation
//
// Author: Mike Kestner <mkestner@novell.com>
//
// Copyright <c> 2007, 2011 Novell, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the Lesser GNU General
// Public License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace GLib {
internal class ToggleRef : IDisposable {
bool hardened;
IntPtr handle;
object reference;
GCHandle gch;
public ToggleRef (GLib.Object target)
{
handle = target.Handle;
gch = GCHandle.Alloc (this);
reference = target;
g_object_add_toggle_ref (target.Handle, ToggleNotifyCallback, (IntPtr) gch);
g_object_unref (target.Handle);
}
public IntPtr Handle {
get { return handle; }
}
public GLib.Object Target {
get {
if (reference == null)
return null;
else if (reference is GLib.Object)
return reference as GLib.Object;
WeakReference weak = (WeakReference)reference;
return weak.Target as GLib.Object;
}
}
public void Dispose ()
{
lock (PendingDestroys) {
PendingDestroys.Remove (this);
}
Free ();
}
void Free ()
{
if (hardened)
g_object_unref (handle);
else
g_object_remove_toggle_ref (handle, ToggleNotifyCallback, (IntPtr) gch);
reference = null;
gch.Free ();
}
internal void Harden ()
{
// Added for the benefit of GnomeProgram. It releases a final ref in
// an atexit handler which causes toggle ref notifications to occur after
// our delegates are gone, so we need a mechanism to override the
// notifications. This method effectively leaks all objects which invoke it,
// but since it is only used by Gnome.Program, which is a singleton object
// with program duration persistence, who cares.
g_object_ref (handle);
g_object_remove_toggle_ref (handle, ToggleNotifyCallback, (IntPtr) gch);
if (reference is WeakReference)
reference = (reference as WeakReference).Target;
hardened = true;
}
void Toggle (bool is_last_ref)
{
if (is_last_ref && reference is GLib.Object)
reference = new WeakReference (reference);
else if (!is_last_ref && reference is WeakReference) {
WeakReference weak = reference as WeakReference;
reference = weak.Target;
}
}
[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
delegate void ToggleNotifyHandler (IntPtr data, IntPtr handle, bool is_last_ref);
static void RefToggled (IntPtr data, IntPtr handle, bool is_last_ref)
{
try {
GCHandle gch = (GCHandle) data;
ToggleRef tref = (ToggleRef)gch.Target;
tref.Toggle (is_last_ref);
} catch (Exception e) {
ExceptionManager.RaiseUnhandledException (e, false);
}
}
static ToggleNotifyHandler toggle_notify_callback;
static ToggleNotifyHandler ToggleNotifyCallback {
get {
if (toggle_notify_callback == null)
toggle_notify_callback = new ToggleNotifyHandler (RefToggled);
return toggle_notify_callback;
}
}
static List<ToggleRef> PendingDestroys = new List<ToggleRef> ();
static bool idle_queued;
public void QueueUnref ()
{
lock (PendingDestroys) {
PendingDestroys.Add (this);
if (!idle_queued){
Timeout.Add (50, new TimeoutHandler (PerformQueuedUnrefs));
idle_queued = true;
}
}
}
static bool PerformQueuedUnrefs ()
{
ToggleRef[] references;
lock (PendingDestroys){
references = new ToggleRef [PendingDestroys.Count];
PendingDestroys.CopyTo (references, 0);
PendingDestroys.Clear ();
idle_queued = false;
}
foreach (ToggleRef r in references)
r.Free ();
return false;
}
[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
static extern void g_object_add_toggle_ref (IntPtr raw, ToggleNotifyHandler notify_cb, IntPtr data);
[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
static extern void g_object_remove_toggle_ref (IntPtr raw, ToggleNotifyHandler notify_cb, IntPtr data);
[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
static extern IntPtr g_object_ref (IntPtr raw);
[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
static extern void g_object_unref (IntPtr raw);
}
}
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