模拟jdk1.5中reentrantlock
选自：java线程2e。类似于jdk1.5中的reentrantlock实现。
package com.cxz.tools;public class BusyFlag {protected Thread busyFlag = null;protected int busyCount = 0;public synchronized void getBusyFlag() throws InterruptedException {while (tryGetBusyFlag() == false) {wait();}}public synchronized void freeBusyFlag() {if (busyFlag == Thread.currentThread()) {busyCount--;if (busyCount == 0) {busyFlag = null;notify();}}}private boolean tryGetBusyFlag() {if (busyFlag == null) {busyFlag = Thread.currentThread();busyCount = 1;return true;}if (busyFlag == Thread.currentThread()) {busyCount++;return true;}return false;}}
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