ThreadMonitor can enter extended wait on monitor without first checking that the evaluation isn't already complete

[LG987234122]

Within ThreadMonitor.run, there's code of the form:

synchronized (monitor) {
      long waitTime = getCheckInterval(runtime);

      if (waitTime == 0) {
          waitTime = 1;
      }
      monitor.wait(waitTime);
  }

The problem here is that if the JS evaluation has completed just prior to entering the synchronized block, the monitor thread won't notice and enter its extended wait. Placing a check for stop within the synchronized block allows the monitor thread to notice the JS evaluation is already complete, avoiding the unecessary wait.

synchronized (monitor) {
          if (stop.get())
          {
        return;
          }

      long waitTime = getCheckInterval(runtime);

      if (waitTime == 0) {
          waitTime = 1;
      }
      monitor.wait(waitTime);
  }

[mxro]

Thank you for raising this issue and suggesting the fix!

The changes has been applied and releases with 0.4.4