1 //
2 // GCTest.cs - NUnit Test Cases for GC
3 //
4 // Authors:
5 //	Marek Safar  <marek.safar@gmail.com>
6 //
7 // Copyright (C) 2016 Xamarin Inc (http://www.xamarin.com)
8 //
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
16 //
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
19 //
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 //
28 
29 using System;
30 using System.Threading;
31 using System.Threading.Tasks;
32 
33 using NUnit.Framework;
34 
35 namespace MonoTests.System {
36 
37 	[TestFixture]
38 	public class GCTest {
39 
40 		class MyFinalizeObject
41 		{
42 			public volatile static int finalized;
43 
~MyFinalizeObject()44 			~MyFinalizeObject ()
45 			{
46 				if (finalized++ == 0) {
47 					GC.ReRegisterForFinalize (this);
48 				}
49 			}
50 		}
51 
Run_ReRegisterForFinalizeTest()52 		static void Run_ReRegisterForFinalizeTest ()
53 		{
54 			var m = new WeakReference<MyFinalizeObject> (new MyFinalizeObject ());
55 			m.SetTarget (null);
56 		}
57 
58 		[Test]
59 		[Category ("InterpreterNotWorking")]
ReRegisterForFinalizeTest()60 		public void ReRegisterForFinalizeTest ()
61 		{
62 			var thread =  new Thread (Run_ReRegisterForFinalizeTest);
63 			thread.Start ();
64 			thread.Join ();
65 
66 			var t = Task.Factory.StartNew (() => {
67 				do {
68 					GC.Collect ();
69 					GC.WaitForPendingFinalizers ();
70 					Task.Yield ();
71 				} while (MyFinalizeObject.finalized != 2);
72 			});
73 
74 			Assert.IsTrue (t.Wait (5000));
75 		}
76 	}
77 }
78