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2bbee634d0
Add a sample to illustrate the point of having a GLibSynchronizationContext, but with the async/await code ifdef'ed out because we don't require Mono 3.0 for now. Instead, provide a crude equivalent of what would be generated by the compiler, to show that it works.
110 lines
2.6 KiB
C#
110 lines
2.6 KiB
C#
// AsyncSample.cs - Async call using SynchronizationContext
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//
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// Author: Bertrand Lorentz <bertrand.lorentz@gmail.com>
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//
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// Copyright (c) 2012 Bertrand Lorentz
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the Lesser GNU General
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// Public License as published by the Free Software Foundation.
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//
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// This program 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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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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namespace Samples
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{
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using Gtk;
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using Gdk;
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using System;
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using System.Threading;
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public class AsyncSample
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{
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static Label msg;
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static Label label;
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static Button button;
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static int count;
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static Thread main_thread;
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public static int Main (string[] args)
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{
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Application.Init ();
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main_thread = Thread.CurrentThread;
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Gtk.Window win = new Gtk.Window ("Gtk# Hello Async World");
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win.DeleteEvent += new DeleteEventHandler (Window_Delete);
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label = new Label ("Doing nothing");
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msg = new Label ("Do Work");
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button = new Button (msg);
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button.Clicked += delegate { DoWork (); };
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VBox box = new VBox (true, 8);
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box.Add (label);
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box.Add (button);
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win.Add (box);
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win.BorderWidth = 4;
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win.ShowAll ();
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Application.Run ();
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return 0;
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}
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#if NET_4_5 // Enable this when we require Mono 3.0
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static async void DoWork ()
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{
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label.Text = "Starting Work";
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int res = await DoLongOperation ();
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CheckThread ("Updating UI");
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label.Text = String.Format ("Work Done ({0})", res);
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}
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#else
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static void DoWork ()
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{
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label.Text = "Starting Work";
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var sc = SynchronizationContext.Current;
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ThreadPool.QueueUserWorkItem (delegate {
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int res = DoLongOperation ();
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sc.Post (delegate {
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CheckThread ("Updating UI");
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label.Text = String.Format ("Work Done ({0})", res);
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}, null);
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});
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}
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#endif
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static int DoLongOperation ()
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{
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count++;
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CheckThread ("Doing long operation");
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Thread.Sleep (2000);
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return count;
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}
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static void CheckThread (string msg)
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{
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if (Thread.CurrentThread == main_thread) {
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Console.WriteLine ("In main thread - {0}", msg);
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} else {
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Console.WriteLine ("Not in main thread - {0}", msg);
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}
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}
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static void Window_Delete (object obj, DeleteEventArgs args)
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{
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Application.Quit ();
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args.RetVal = true;
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}
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}
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}
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