java CyclicBarrier“ count”字段未使用final定义。如何确保计数字段的安全发布

Question

我最近正在学习Java并发编程。我知道final关键字可以保证安全的发布。但是，当我阅读“ CyclicBarrier”源代码时，发现“ count”字段未使用final关键字。因此，当第一次调用“ dowait”时，“ count”是否有可能是0而不是初始值

public class CyclicBarrier 
...
private int count;
...
public CyclicBarrier(int parties, Runnable barrierAction) 
        if (parties <= 0) throw new IllegalArgumentException();
        this.parties = parties;
        this.count = parties;
        this.barrierCommand = barrierAction;

public int await() throws InterruptedException, BrokenBarrierException 
        try 
            return dowait(false, 0L);
         catch (TimeoutException toe) 
            throw new Error(toe); // cannot happen
        
    
private int dowait(boolean timed, long nanos)
        throws InterruptedException, BrokenBarrierException,
               TimeoutException 
        final ReentrantLock lock = this.lock;
        lock.lock();
        try 
            final Generation g = generation;

            if (g.broken)
                throw new BrokenBarrierException();

            if (Thread.interrupted()) 
                breakBarrier();
                throw new InterruptedException();
            

            int index = --count;
            if (index == 0)   // tripped
                boolean ranAction = false;
                try 
                    final Runnable command = barrierCommand;
                    if (command != null)
                        command.run();
                    ranAction = true;
                    nextGeneration();
                    return 0;
                 finally 
                    if (!ranAction)
                        breakBarrier();
                
            

            // loop until tripped, broken, interrupted, or timed out
            for (;;) 
                try 
                    if (!timed)
                        trip.await();
                    else if (nanos > 0L)
                        nanos = trip.awaitNanos(nanos);
                 catch (InterruptedException ie) 
                    if (g == generation && ! g.broken) 
                        breakBarrier();
                        throw ie;
                     else 
                        // We're about to finish waiting even if we had not
                        // been interrupted, so this interrupt is deemed to
                        // "belong" to subsequent execution.
                        Thread.currentThread().interrupt();
                    
                

                if (g.broken)
                    throw new BrokenBarrierException();

                if (g != generation)
                    return index;

                if (timed && nanos <= 0L) 
                    breakBarrier();
                    throw new TimeoutException();
                
            
         finally 
            lock.unlock();

有人可以帮我吗？