pull.cs

public string PullAvailableEngineer()
{
  while (true)
  {
    var get = new GetCompareExchangeValueOperation<List<string>>(
    	key);
    var getResult = _store.Operations.Send(get);
    if(getResult == null)
    {
        // no support engineers, wait and retry
        Thread.Sleep(500);
        continue;
    }
    string engineer = getResult.Value[0];
    getResult.Value.RemoveAt(0);

    CompareExchangeResult<List<string>> result;
    if (getResult.Value.Count == 0)
    {
      var del = 
     	new DeleteCompareExchangeValueOperation<List<string>>(
	         key,
	         getResult.Index);
      result = _store.Operations.Send(del);
    }
    else
    {
      var put = 
     	new PutCompareExchangeValueOperation<List<string>>(
	         key,
	         getResult.Value,
	         getResult.Index);
      result = _store.Operations.Send(put);
    }

    if (result.Successful)
        return engineer;

    // someone took an available engineer
    // while we were running, let's try again...
  }
}