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Overview
Comment:Revise the MultithreadingTest to remove potential race conditions on slower systems.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
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SHA1: 0ccc54331a6ae6f65e62993a94d526e2752b7a92
User & Date: mistachkin 2011-07-23 04:01:47
Context
2011-07-23
04:39
Show version information for the interop assembly during testing. check-in: 6e630b74b2 user: mistachkin tags: trunk
04:01
Revise the MultithreadingTest to remove potential race conditions on slower systems. check-in: 0ccc54331a user: mistachkin tags: trunk
00:59
Merge interop changes for debug SQLite core testing and updated SQLite core itself. check-in: ff19f6474c user: mistachkin tags: trunk
Changes
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Changes to test/TestCases.cs.

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using System.Collections.Generic;
using System.Text;

namespace test
{
  internal class TestCases : TestCaseBase
  {



    private List<string> droptables = new List<string>();
    private List<string> maydroptable = new List<string>();
    private long logevents = 0;
    

    internal TestCases()
    {
................................................................................

    internal class MTTest
    {
      internal DbConnection cnn;
      internal Exception e;
      internal System.Threading.Thread t;
      internal int value;

    }

    [Test(Sequence=11)]
    internal void MultithreadingTest()
    {
      using (DbCommand cmd = _cnn.CreateCommand())
      {
................................................................................
          cmd.CommandText = "CREATE TABLE MultiThreadedTest(ID integer identity primary key, ThreadId integer, MyValue integer)";
        else
          cmd.CommandText = "CREATE TABLE MultiThreadedTest(ID integer primary key, ThreadId integer, MyValue integer)";

        cmd.ExecuteNonQuery();
      }


      MTTest[] arr = new MTTest[8];

      for (int n = 0; n < arr.Length; n++)
      {
        arr[n] = new MTTest();
        arr[n].t = new System.Threading.Thread(new System.Threading.ParameterizedThreadStart(MultithreadedTestThread));
        arr[n].t.IsBackground = true;
        arr[n].cnn = ((ICloneable)_cnn).Clone() as DbConnection;

        arr[n].t.Start(arr[n]);
      }

      System.Threading.Thread.Sleep(8000);

      bool failed = false;
      Exception e = null;

      for (int n = 0; n < arr.Length; n++)
      {
        if (arr[n].t.Join(0) == false)
        {
          failed = true;
          arr[n].t.Abort();

        }
        if (arr[n].e != null) e = arr[n].e;
        arr[n].cnn.Dispose();

      }
      if (failed) throw new Exception("One or more threads deadlocked");
      if (e != null) 
        throw e;
    }

    internal void MultithreadedTestThread(object obj)
................................................................................
        test.cnn.Open();

      int start = Environment.TickCount;
      try
      {
        using (DbCommand cmd = test.cnn.CreateCommand())
        {

          while (Environment.TickCount - start < 2000)
          {
            using (DbTransaction trans = test.cnn.BeginTransaction())
            {
              cmd.CommandText = String.Format("SELECT * FROM MultiThreadedTest WHERE ThreadId = {0}", test.t.ManagedThreadId);
              cmd.Transaction = trans;
              using (DbDataReader reader = cmd.ExecuteReader())
              {
................................................................................
                }
              }
              cmd.CommandText = String.Format("INSERT INTO MultiThreadedTest(ThreadId, MyValue) VALUES({0}, {1})", test.t.ManagedThreadId, Environment.TickCount);
              cmd.ExecuteNonQuery();

              trans.Commit();
            }


          }
        }
      }
      catch (Exception e)
      {
        test.e = e;
      }




    }

    [Test]
    internal void ParameterizedInsert()
    {
      using (DbCommand cmd = _cnn.CreateCommand())
      {







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using System.Collections.Generic;
using System.Text;

namespace test
{
  internal class TestCases : TestCaseBase
  {
    private const int NumThreads = 8;
    private const int ThreadTimeout = 60000;

    private List<string> droptables = new List<string>();
    private List<string> maydroptable = new List<string>();
    private long logevents = 0;
    

    internal TestCases()
    {
................................................................................

    internal class MTTest
    {
      internal DbConnection cnn;
      internal Exception e;
      internal System.Threading.Thread t;
      internal int value;
      internal System.Threading.ManualResetEvent ev;
    }

    [Test(Sequence=11)]
    internal void MultithreadingTest()
    {
      using (DbCommand cmd = _cnn.CreateCommand())
      {
................................................................................
          cmd.CommandText = "CREATE TABLE MultiThreadedTest(ID integer identity primary key, ThreadId integer, MyValue integer)";
        else
          cmd.CommandText = "CREATE TABLE MultiThreadedTest(ID integer primary key, ThreadId integer, MyValue integer)";

        cmd.ExecuteNonQuery();
      }

      System.Threading.ManualResetEvent[] events = new System.Threading.ManualResetEvent[NumThreads];
      MTTest[] arr = new MTTest[NumThreads];

      for (int n = 0; n < arr.Length; n++)
      {
        arr[n] = new MTTest();
        arr[n].t = new System.Threading.Thread(new System.Threading.ParameterizedThreadStart(MultithreadedTestThread));
        arr[n].t.IsBackground = true;
        arr[n].cnn = ((ICloneable)_cnn).Clone() as DbConnection;
        arr[n].ev = events[n] = new System.Threading.ManualResetEvent(false);
        arr[n].t.Start(arr[n]);
      }

      System.Threading.WaitHandle.WaitAll(events, ThreadTimeout);

      bool failed = false;
      Exception e = null;

      for (int n = 0; n < arr.Length; n++)
      {
        if (arr[n].t.Join(0) == false)
        {
          failed = true;
          arr[n].t.Abort();
          arr[n].t.Join();
        }
        if (arr[n].e != null) e = arr[n].e;
        arr[n].cnn.Dispose();
        arr[n].ev.Close();
      }
      if (failed) throw new Exception("One or more threads deadlocked");
      if (e != null) 
        throw e;
    }

    internal void MultithreadedTestThread(object obj)
................................................................................
        test.cnn.Open();

      int start = Environment.TickCount;
      try
      {
        using (DbCommand cmd = test.cnn.CreateCommand())
        {
          bool once = false;
          while (!once || ((Environment.TickCount - start) < 2000))
          {
            using (DbTransaction trans = test.cnn.BeginTransaction())
            {
              cmd.CommandText = String.Format("SELECT * FROM MultiThreadedTest WHERE ThreadId = {0}", test.t.ManagedThreadId);
              cmd.Transaction = trans;
              using (DbDataReader reader = cmd.ExecuteReader())
              {
................................................................................
                }
              }
              cmd.CommandText = String.Format("INSERT INTO MultiThreadedTest(ThreadId, MyValue) VALUES({0}, {1})", test.t.ManagedThreadId, Environment.TickCount);
              cmd.ExecuteNonQuery();

              trans.Commit();
            }

            once = true;
          }
        }
      }
      catch (Exception e)
      {
        test.e = e;
      }
      finally
      {
        test.ev.Set();
      }
    }

    [Test]
    internal void ParameterizedInsert()
    {
      using (DbCommand cmd = _cnn.CreateCommand())
      {