Detect synchronized

Question

Are there any java methods of doing the following pseudocode:
public synchronized foo() {
  // foo does stuff that takes a while
public void threadLoop() {
  new Thread() {
    public void run() {
      Thread.sleep(5 minutes);
      if ( !foo.isCurrentlySynchronized() ) {
        foo();
  }.start();
// users may be able to call foo from a GUI or other interface,
// causing it to be executed elsewhere from the anonymous threadIn other words, if the method foo is currently executing, don't call it. I could do this with booleans, objects, making foo private with a wrapper function, etc.; but I'm looking for the safe and proper way to do this - if at all possible.
Thank you.

Answer 1

Object.wait() with a very short non-zero timeout will
tell you that.I think you have that the wrong way around. You can't call wait() until you own the lock, and you are trying to determine if the lock is owned.
You could use a java.util.concurrent.locks.ReentrantLock instead of synchronized and then you could use tryLock to see if the lock is available and hence foo() is not running.