Minimize lock time

[Kagamin]

Let's consider the following code:

synchronized(syncRoot)
{
  if(condition)opSuccess();
  else writeln(possibly,slow);
}

Suppose the else close doesn't need to be executed in lock domain and can be slow. How to minimize lock time here?

synchronized(syncRoot)
{
  if(condition)opSuccess();
  else goto Lwrite;
}
Lwrite: writeln(possibly,slow);

We can do this... but...