mono/tests/monitor-resurrection.cs

   1 using System;
   2 using System.Collections;
   3 using System.Threading;
   4 using System.Collections.Generic;
   5
   6 public class Foo  {
   7         static Foo resurrect;
   8         static Foo reference;
   9         static List<Foo> list = new List<Foo> ();
  10
  11         ~Foo() {
  12                 resurrect = this;
  13         }
  14
  15         public static void EnterMonitor (object obj)
  16         {
  17                 for (int i = 0; i < 257; i++)
  18                         Monitor.Enter (obj);
  19         }
  20
  21         public static void ExitMonitor (object obj)
  22         {
  23                 for (int i = 0; i < 257; i++)
  24                         Monitor.Exit (obj);
  25         }
  26
  27         public static void CreateFoo (int level)
  28         {
  29                 if (level == 0) {
  30                         reference = new Foo ();
  31
  32                         /* Allocate a MonoThreadsSync for the object */
  33                         EnterMonitor (reference);
  34                         ExitMonitor (reference);
  35                         reference = null;
  36                 } else {
  37                         CreateFoo (level - 1);
  38                 }
  39         }
  40
  41         public static int Main() {
  42                 /* Allocate an object down the stack so it doesn't get pinned */
  43                 CreateFoo (100);
  44
  45                 Console.WriteLine (".");
  46
  47                 /* resurrect obj */
  48                 GC.Collect ();
  49                 GC.WaitForPendingFinalizers ();
  50
  51                 /* Allocate MonoThreadsSyncs for another thread that are locked */
  52                 Thread t = new Thread (new ThreadStart (resurrect.Func));
  53                 t.Start ();
  54                 t.Join ();
  55
  56                 /* Make sure that none of the other structures overlap with the original one */
  57                 Monitor.Enter (resurrect);
  58                 return 0;
  59         }
  60
  61         public void Func () {
  62                 for (int i = 0; i < 100; i++) {
  63                         Foo foo = new Foo ();
  64                         /* Make sure these are not collected */
  65                         list.Add (foo);
  66
  67                         EnterMonitor (foo);
  68                 }
  69         }
  70 }
  71