Java 死鎖
阿新 • • 發佈:2018-01-18
ron func run blog pub read 同步 lock println
/* 死鎖:常見情景之一:同步的嵌套。 */ class Test implements Runnable { private boolean flag; Test(boolean flag) { this.flag = flag; } public void run() { if(flag) { while(true) synchronized(MyLock.locka) { System.out.println(Thread.currentThread().getName()Output: Thread-0..if locka.... Thread-1..else lockb....+"..if locka...."); synchronized(MyLock.lockb) { System.out.println(Thread.currentThread().getName()+"..if lockb...."); } } } else {while(true) synchronized(MyLock.lockb) { System.out.println(Thread.currentThread().getName()+"..else lockb...."); synchronized(MyLock.locka) { System.out.println(Thread.currentThread().getName()+"..else locka...."); } } } } } class MyLock { public static final Object locka = new Object(); public static final Object lockb = new Object(); } class SynFunctionLockDemo { public static void main(String[] args) { Test a = new Test(true); Test b = new Test(false); Thread t1 = new Thread(a); Thread t2 = new Thread(b); t1.start(); t2.start(); } }
Java 死鎖