private static Thread StartEvilThread(EvilThreadArgument arg)
{
ThreadStart entry = () => {
arg.ExceptionType = null;
try {
using (var command = arg.Connection.CreateCommand(arg.Statement)) {
arg.StartEvent.WaitOne();
command.ExecuteNonQuery();
}
}
catch (Exception exception) {
arg.ExceptionType = arg.Connection.Driver.GetExceptionType(exception);
}
arg.Connection.Rollback();
};
var thread = new Thread(entry);
thread.Start();
return(thread);
}
public virtual void DeadlockTest()
{
var table = schema.CreateTable(DeadlockTableName);
CreatePrimaryKey(table);
var column = table.CreateColumn("value", Driver.TypeMappings[typeof(int)].MapType());
column.IsNullable = true;
ExecuteNonQuery(SqlDdl.Create(table));
Connection.BeginTransaction();
var tableRef = SqlDml.TableRef(table);
var insert = SqlDml.Insert(tableRef);
insert.Values.Add(tableRef[IdColumnName], 1);
ExecuteNonQuery(insert);
insert.Values.Clear();
insert.Values.Add(tableRef[IdColumnName], 2);
ExecuteNonQuery(insert);
Connection.Commit();
var update1To1 = SqlDml.Update(tableRef);
update1To1.Where = tableRef[IdColumnName] == 1;
update1To1.Values.Add(tableRef[column.Name], 1);
var update1To2 = SqlDml.Update(tableRef);
update1To2.Where = tableRef[IdColumnName] == 1;
update1To2.Values.Add(tableRef[column.Name], 2);
var update2To1 = SqlDml.Update(tableRef);
update2To1.Where = tableRef[IdColumnName] == 2;
update2To1.Values.Add(tableRef[column.Name], 1);
var update2To2 = SqlDml.Update(tableRef);
update2To2.Where = tableRef[IdColumnName] == 2;
update2To2.Values.Add(tableRef[column.Name], 2);
using (var connectionOne = this.Driver.CreateConnection()) {
connectionOne.Open();
connectionOne.BeginTransaction(IsolationLevel.ReadCommitted);
using (var connectionTwo = Driver.CreateConnection()) {
connectionTwo.Open();
connectionTwo.BeginTransaction(IsolationLevel.ReadCommitted);
using (var command = connectionOne.CreateCommand(update1To1))
command.ExecuteNonQuery();
using (var command = connectionTwo.CreateCommand(update2To2))
command.ExecuteNonQuery();
var startEvent = new EventWaitHandle(false, EventResetMode.ManualReset);
var arg1 = new EvilThreadArgument
{
Connection = connectionOne,
StartEvent = startEvent,
Statement = update2To1
};
var arg2 = new EvilThreadArgument
{
Connection = connectionTwo,
StartEvent = startEvent,
Statement = update1To2
};
var thread1 = StartEvilThread(arg1);
var thread2 = StartEvilThread(arg2);
startEvent.Set();
thread1.Join();
thread2.Join();
startEvent.Close();
var actual = arg1.ExceptionType ?? arg2.ExceptionType ?? SqlExceptionType.Unknown;
AssertExceptionType(SqlExceptionType.Deadlock, actual);
}
}
}