109 lines
3.1 KiB
C#
109 lines
3.1 KiB
C#
//
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// GCTest.cs - NUnit Test Cases for GC
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//
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// Authors:
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// Marek Safar <marek.safar@gmail.com>
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//
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// Copyright (C) 2016 Xamarin Inc (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using NUnit.Framework;
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namespace MonoTests.System {
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[TestFixture]
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public class GCTest {
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static class FinalizerHelpers {
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private static IntPtr aptr;
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private static unsafe void NoPinActionHelper (int depth, Action act)
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{
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// Avoid tail calls
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int* values = stackalloc int [20];
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aptr = new IntPtr (values);
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if (depth <= 0) {
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//
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// When the action is called, this new thread might have not allocated
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// anything yet in the nursery. This means that the address of the first
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// object that would be allocated would be at the start of the tlab and
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// implicitly the end of the previous tlab (address which can be in use
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// when allocating on another thread, at checking if an object fits in
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// this other tlab). We allocate a new dummy object to avoid this type
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// of false pinning for most common cases.
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//
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new object ();
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act ();
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} else {
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NoPinActionHelper (depth - 1, act);
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}
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}
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public static void PerformNoPinAction (Action act)
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{
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Thread thr = new Thread (() => NoPinActionHelper (128, act));
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thr.Start ();
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thr.Join ();
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}
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}
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class MyFinalizeObject
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{
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public volatile static int finalized;
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~MyFinalizeObject ()
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{
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if (finalized++ == 0) {
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GC.ReRegisterForFinalize (this);
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}
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}
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}
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static void Run_ReRegisterForFinalizeTest ()
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{
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var m = new WeakReference<MyFinalizeObject> (new MyFinalizeObject ());
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m.SetTarget (null);
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}
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[Test]
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public void ReRegisterForFinalizeTest ()
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{
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FinalizerHelpers.PerformNoPinAction (delegate () {
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Run_ReRegisterForFinalizeTest ();
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});
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var t = Task.Factory.StartNew (() => {
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do {
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GC.Collect ();
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GC.WaitForPendingFinalizers ();
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Task.Yield ();
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} while (MyFinalizeObject.finalized != 2);
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});
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Assert.IsTrue (t.Wait (5000));
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}
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}
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}
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