title: How can I write a conditional lock in C#?
body: <p>The thing is I've been using the <a href="http://msdn.microsoft.com/en-us/library/c5kehkcz.aspx" rel="noreferrer">lock statement</a> to protect a critical part of my code, but now, I realize I could allow concurrent execution of that critical code is some conditions are met.<br>
  Is there a way to condition the lock?</p>