code: public long getPID() {
  		long currentPID = cachedPID.get();
  		if (currentPID != 0) {
  			return currentPID;
  		}
  		try {
  			currentPID = detectPID();
  		} catch (Throwable cause) {
  			logger.info("Unable to detect process ID!", cause);
  		}
  		if (currentPID == 0) {
  			currentPID = System.nanoTime();
  			if (!cachedPID.compareAndSet(0, currentPID)) {
  				currentPID = cachedPID.get();
  			}
  		} else {
  			cachedPID.set(currentPID);
  		}
  		return currentPID;
  	}
docs: Returns the cached PID of Java VM.
  
  @return current Java VM's process ID