mono/tests/finalizer-wait.cs

   1 using System;
   2 using System.Threading;
   3 using System.Runtime.ConstrainedExecution;
   4
   5 class P
   6 {
   7         int index;
   8         ManualResetEvent mre;
   9
  10         public static int Count = 0;
  11
  12         public P (int index, ManualResetEvent mre)
  13         {
  14                 this.index = index;
  15                 this.mre = mre;
  16         }
  17
  18         ~P ()
  19         {
  20                 mre.Set ();
  21
  22                 Console.Write (String.Format ("[{0}] Finalize\n", index));
  23                 Count ++;
  24                 Console.Write (String.Format ("[{0}] Finalize -- end\n", index));
  25         }
  26 }
  27
  28 class Driver
  29 {
  30         static int Main ()
  31         {
  32                 Thread thread;
  33                 ManualResetEvent mre;
  34                 int collected, total = 100;
  35
  36                 for (int i = 1; i <= 1000; ++i) {
  37                         P.Count = 0;
  38
  39                         mre = new ManualResetEvent (false);
  40
  41                         thread = new Thread (() => {
  42                                 for (int j = 0; j < total; ++j)
  43                                         new P (i, mre);
  44                         });
  45                         thread.Start ();
  46                         thread.Join ();
  47
  48                         GC.Collect ();
  49
  50                         Console.Write (String.Format ("[{0}] Wait for pending finalizers\n", i));
  51                         GC.WaitForPendingFinalizers ();
  52                         Console.Write (String.Format ("[{0}] Wait for pending finalizers -- end\n", i));
  53
  54                         collected = P.Count;
  55                         if (collected == 0) {
  56                                 if (!mre.WaitOne (5000)) {
  57                                         Console.Write (String.Format ("[{0}] Finalizer never started\n", i));
  58                                         return 1;
  59                                 }
  60
  61                                 Console.Write (String.Format ("[{0}] Wait for pending finalizers (2)\n", i));
  62                                 GC.WaitForPendingFinalizers ();
  63                                 Console.Write (String.Format ("[{0}] Wait for pending finalizers (2) -- end\n", i));
  64
  65                                 collected = P.Count;
  66                                 if (collected == 0) {
  67                                         /* At least 1 finalizer started (as mre has been Set), but P.Count has not been incremented */
  68                                         Console.Write (String.Format ("[{0}] Did not wait for finalizers to run\n", i));
  69                                         return 2;
  70                                 }
  71                         }
  72
  73                         if (collected != total) {
  74                                 /* Not all finalizer finished, before returning from WaitForPendingFinalizers. Or not all objects
  75                                  * have been garbage collected; this might be due to false pinning */
  76                                 Console.Write (String.Format ("[{0}] Finalized {1} of {2} objects\n", i, collected, total));
  77                         }
  78                 }
  79                 return 0;
  80         }
  81 }