1.釋放鎖
2.輪詢檢查線程是否在同步線程上，如果在則退出自旋。否則檢查是否已超過解除掛起時(shí)間，如果超過，則退出掛起，否則繼續(xù)掛起線程到等待解除掛起。
3.退出掛起之后，采用自旋的方式競(jìng)爭(zhēng)鎖。

 public final long awaitNanos(long nanosTimeout)
                throws InterruptedException {
            if (Thread.interrupted())
                throw new InterruptedException();
          //將 
            Node node = addConditionWaiter(); 
         //
            long savedState = fullyRelease(node);
            final long deadline = System.nanoTime() + nanosTimeout;
            int interruptMode = 0;
        //采用自旋的方式檢查是否已在同步隊(duì)列當(dāng)中
            while (!isOnSyncQueue(node)) {
                //如果掛起超過一定的時(shí)間，則退出
                if (nanosTimeout <= 0L) {
                    transferAfterCancelledWait(node);
                    break;
                }
                //繼續(xù)掛起線程
                if (nanosTimeout >= spinForTimeoutThreshold)
                    LockSupport.parkNanos(this, nanosTimeout);
                if ((interruptMode = checkInterruptWhileWaiting(node)) != 0)
                    break;
                nanosTimeout = deadline - System.nanoTime();
            }
          //采用自旋的方式競(jìng)爭(zhēng)鎖
            if (acquireQueued(node, savedState) && interruptMode != THROW_IE)
                interruptMode = REINTERRUPT;
            if (node.nextWaiter != null)
                unlinkCancelledWaiters();
            if (interruptMode != 0)
                reportInterruptAfterWait(interruptMode);
            return deadline - System.nanoTime();
        }