*/publicsynchronizedvoiddraw(Graphics2D g){Window window=screen.getFullScreenWindow();//使用指定的算法实现图像的显示--要求“文本抗锯齿提示键”和"文本抗锯齿提示值"g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);//绘制背景图像g.setColor(window.getBackgroun...
c + SHARED_UNIT)) {if(sharedCount(c) ==0) {//指明当前线程为第一个ReaderfirstReader = current;//初始化第一个Reader的入锁次数firstReaderHoldCount =1;
File"<stdin>", line1,in<module> TypeError: unsupported operandtype(s)for+=:'frozenset'and'set'>>>A +=frozenset({6}) Traceback (most recent call last): File"<stdin>", line1,in<module> TypeError: unsupported operandtype(s)for+=:'frozenset'and'frozenset' 如您在上面的示例中看到的那样,...
此方法是独占模式(独占模式是通过isHeldByCurrentThread或getHoldCount方法进行判断的,也就是比较持有锁的线程是否是当前线程)下线程获取共享资源的顶层入口。如果获取到资源,线程直接返回,否则进入同步队列,直到获取到资源为止,且整个过程忽略中断的影响。这也正是lock()的语义,当然不仅仅只限于lock()。获取到资源后,线...
23 for(;;) {24 Node h =head;25 if (h != null && h !=tail) {26 int ws =h.waitStatus;27 if (ws ==Node.SIGNAL) {28 if (!compareAndSetWaitStatus(h, Node.SIGNAL, 0))29 continue; //loop to recheck cases30 //唤醒后续节点 ...
But if cancelled or apparently null, * traverse backwards from tail to find the actual * non-cancelled successor. */ Node s = node.next; if (s == null || s.waitStatus > 0) { s = null; for (Node t = tail; t != null && t != node; t = t.prev) if (t.waitStatus <= 0...
But if cancelled or apparently null, * traverse backwards from tail to find the actual * non-cancelled successor. */ Node s = node.next; if (s == null || s.waitStatus > 0) { s = null; for (Node t = tail; t != null && t != node; t = t.prev) if (t.waitStatus <= 0...
8047288 client-libs java.awt [macosx] Endless loop in EDT on Mac Changes in Java SE 8u20 b31 Please note that fixes from the prior BPR (8u11 b31) are included in this BPR. Bug Fixes BugIdComponentSubcomponentSummary 8029837 xml jaxp NPE seen in XMLDocumentFragmentScannerImpl.setProperty ...
for (; ; ) { int lastCount = getState(); int newCount = lastCount - reduceCount; if (newCount < 0 || compareAndSetState(lastCount, newCount)) { return newCount; } } } @Override protected boolean tryReleaseShared(int returnCount) { // 释放共享资源,因为可能有多个线程同时执行,所以需...
count; if (count <= 1) { readHolds.remove(); if (count <= 0) throw unmatchedUnlockException(); } --rh.count; } for (;;) { int c = getState(); int nextc = c - SHARED_UNIT; if (compareAndSetState(c, nextc)) // Releasing the read lock has no effect on readers, // ...