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// ThreadNotify.cs: implements a notification for the thread running the Gtk main
// loop from another thread
//
// Authors:
// Miguel de Icaza (miguel@ximian.com).
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// Copyright (c) 2002 Ximian, Inc.
// Copyright (c) 2004 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.
namespace Gtk {
using System.Runtime.InteropServices;
using System.Threading;
using System;
// <summary>
// This delegate will be invoked on the main Gtk thread.
// </summary>
public delegate void ReadyEvent ();
/// <summary>
/// Utility class to help writting multi-threaded Gtk applications
/// </summary>
/// <remarks/>
///
public class ThreadNotify : IDisposable {
bool disposed;
ReadyEvent re;
GLib.IdleHandler idle;
bool notified;
/// <summary>
/// The ReadyEvent delegate will be invoked on the current thread (which should
/// be the Gtk thread) when another thread wakes us up by calling WakeupMain
/// </summary>
public ThreadNotify (ReadyEvent re)
{
this.re = re;
idle = new GLib.IdleHandler (CallbackWrapper);
}
bool CallbackWrapper ()
{
lock (this) {
if (disposed)
return false;
notified = false;
}
re ();
return false;
}
/// <summary>
/// Invoke this function from a thread to call the `ReadyEvent'
/// delegate provided in the constructor on the Main Gtk thread
/// </summary>
public void WakeupMain ()
{
lock (this){
if (notified)
return;
notified = true;
GLib.Idle.Add (idle);
}
}
public void Close ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
~ThreadNotify ()
{
Dispose (false);
}
void IDisposable.Dispose ()
{
Close ();
}
protected virtual void Dispose (bool disposing)
{
lock (this) {
disposed = true;
}
}
}
}
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