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;
当CountDownLatch初始化的时候会传入业务需要先执行的线程数目count值,后续线程调用await()方法则加入阻塞队列等待其他线程执行完成。countDown()方法则是在某个线程业务完成后将计数器count值减一,表示这个线程已经执行。如果所有先行线程执行完成,最终count值等于0,此时CountDownLatch就会唤醒阻塞队列中的线程继续执行。 ...
should only happen if no monotonic clock // not a guarantee() because JVM should not abort on kernel/glibc bugs assert(!Linux::supports_monotonic_clock(), "time moving backwards"); } else { millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; } if(millis <= 0) break...
Move loop invariants outside the loop. Make tests as simple as possible. Perform the loop backwards (this actually performs slightly faster than forward loops do). [Actually it is converting the test to compare against 0 that makes the difference]. Use only local variables inside a loop; assi...
// Go through the elements backwards // by adjusting the for-loop public void forAllBackwards(int[] nums) { for (int i = nums.length-1; i>=0; i--) { System.out.println( nums[i] ); } } With this sort of code, we have to be careful with the exact specification of the for...
It is the direct successor of Apache Storm, built to be backwards compatible with Storm's topology API but with a wide array of architectural improvements. . http://heronstreaming.io License: Apache 2. Apache ZooKeeper - ZooKeeper is a centralized service for maintaining configuration information...
0and1. The following example code shows how to use aforloop to print a Fibonacci sequence: publicclassPrintFibonacci{publicstaticvoidprintFibonacciSequence(intcount){inta=0;int=1;intc=1for(inti=1;i<=count;i++){System.out.print(a+", ");a=b;b=c;c=a+b;}}publicstaticvoidmain(String[...
commands in the batch executed successfully and which ones they are. For example, if five commands executed successfully, the array will contain five numbers: the first one being the update count for the first command, the second one being the update count for the second command, and so on....
(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);//绘制背景图像g.setColor(window.getBackground());g.fillRect(0,0,screen.getWidth(),screen.getHeight());//绘制需要显示的消息g.setColor(window.getForeground());int y=FONT_SIZE;//绘制文字在互屏幕中去for(int i=0;...
int nextIndex(); //Returns the index of the element that would be returned by a subsequent call to next(); // For iteration in backward direction boolean hasPrevious(); E previous(); //Returns the previous element in the list and moves the cursor position backwards. int previousIndex();...