StackOverflow:RU:588475

gistfile1.txt

public void DoWork()
{
    //Your code goes here

    Task.Factory.StartNew(() => 
      {
          var coat = human.Coar("2");

          if (!coat.SetOwner(human)) return;

          // some logic

          coat.SetOwner(null);
      });
}

public class Human
{
    //your code here
}

public class Coat
{        
    public Human Owner {get; private set; }

    private object _lockObject = new object();

    public bool SetOwner(Human owner)
    {
        if (Owner != null) return false;
        lock(_lockObject)
        {
            if (Owner != null) return false;

            Owner = owner;
            return true;
        }
    }      

}