标签：== code dex lock article distrib blog 就会 获取
所谓不可重入锁，即若当前线程执行某个方法已经获取了该锁，那么在方法中尝试再次获取锁时，就会获取不到被阻塞。我们尝试设计一个不可重入锁（使用synchronized关键字设计）
不可重入锁
public class Lock{ private boolean isLocked = false; public synchronized void lock() throws InterruptedException{ while(isLocked){ wait(); } isLocked = true; } public synchronized void unlock(){ isLocked = false; notify(); } }
public class Count{ Lock lock = new Lock(); public void print(){ lock.lock(); doAdd(); lock.unlock(); } public void doAdd(){ lock.lock(); //do something lock.unlock(); } }
可重入锁
public class Lock{ boolean isLocked = false; Thread lockedBy = null; int lockedCount = 0; public synchronized void lock() throws InterruptedException{ Thread thread = Thread.currentThread(); while(isLocked && lockedBy != thread){ wait(); } isLocked = true; lockedCount++; lockedBy = thread; } public synchronized void unlock(){ if(Thread.currentThread() == this.lockedBy){ lockedCount--; if(lockedCount == 0){ isLocked = false; notify(); } } } }
标签：== code dex lock article distrib blog 就会 获取
原文地址：https://www.cnblogs.com/lt123/p/12835222.html
