gistfile1.java

wlock.lock();
rlock.lock();
try {
			
	long cur_time = System.nanoTime();
			
	if (cur_time > (lastUpdate + 1000000000L)) {
		setVersion(getVersion() + 1);
		setLastUpdate(cur_time);
	}
			
} finally {
	rlock.unlock();
	wlock.unlock();
}