A task scheduler which will escape current tick if is busy with previous

TaskScheduler.cs

public class TaskScheduler 
    {
        private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private readonly Timer _timer;

        public ServiceContext(DrawingsController controller, IAppConfig config): base(controller)
        {
            var _interval = 1000 * 60 * config.DrawEveryNMinutes;

            _timer = new Timer(_interval) { AutoReset = true };

            Log.DebugFormat("Drawing will be executed every {0} min", _interval);
        }

        // This is the synchronization point that prevents events
        // from running concurrently, and prevents the main thread 
        // from executing code after the Stop method until any 
        // event handlers are done executing.
        private static int syncPoint = 0;

        public override void OnInit()
        {
            _timer.Start();
            _timer.Elapsed += (sender, e) =>
            {
                  Log.DebugFormat("Executing as time elapsed at: {0}", DateTime.Now);

                  if (Interlocked.CompareExchange(ref syncPoint, 1, 0) == 0){
                      Execute();
                      syncPoint = 0;
                  }
                  else
                      Log.DebugFormat("Previous Drawing is still going on, this one will be skipped");
              };
        }

        public override void Dispose()
        {
            _timer.Stop();
        }
    }