昆山规建设局网站,温州专业营销网站制作,潼南国外免费自助建站,可以自己设计房子的软件偏向状态
一个对象创建时#xff1a;
如果开启了偏向锁#xff08;默认开启#xff09;#xff0c;那么对象创建后#xff0c;markword 值为 0x05 即最后 3 位为 101#xff0c;这时它的thread、epoch、age 都为 0。偏向锁是默认是延迟的#xff0c;不会在程序启动时立…偏向状态
一个对象创建时
如果开启了偏向锁默认开启那么对象创建后markword 值为 0x05 即最后 3 位为 101这时它的thread、epoch、age 都为 0。偏向锁是默认是延迟的不会在程序启动时立即生效如果想避免延迟可以加 VM 参数 -XX:BiasedLockingStartupDelay0 来禁用延迟。如果没有开启偏向锁那么对象创建后markword 值为 0x01 即最后 3 位为 001这时它的 hashcode、 age 都为 0第一次用到 hashcode 时才会赋值。
1 测试延迟特性
2 测试偏向锁
class Dog {}利用 jol 第三方工具来查看对象头信息
// 添加虚拟机参数 -XX:BiasedLockingStartupDelay0 public static void main(String[] args) throws IOException {Dog d new Dog();ClassLayout classLayout ClassLayout.parseInstance(d);new Thread(() - {log.debug(synchronized 前);System.out.println(classLayout.toPrintableSimple(true));synchronized (d) {log.debug(synchronized 中);System.out.println(classLayout.toPrintableSimple(true));}log.debug(synchronized 后);System.out.println(classLayout.toPrintableSimple(true));}, t1).start();}输出
11:08:58.117 c.TestBiased [t1] - synchronized 前
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000101
11:08:58.121 c.TestBiased [t1] - synchronized 中
00000000 00000000 00000000 00000000 00011111 11101011 11010000 00000101
11:08:58.121 c.TestBiased [t1] - synchronized 后
00000000 00000000 00000000 00000000 00011111 11101011 11010000 00000101注意:
处于偏向锁的对象解锁后线程 id 仍存储于对象头中。
3 测试禁用
在上面测试代码运行时在添加 VM 参数 -XX:-UseBiasedLocking 禁用偏向锁。
输出
11:13:10.018 c.TestBiased [t1] - synchronized 前
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
11:13:10.021 c.TestBiased [t1] - synchronized 中
00000000 00000000 00000000 00000000 00100000 00010100 11110011 10001000
11:13:10.021 c.TestBiased [t1] - synchronized 后
00000000 00000000 00000000 00000000 00000000 00000000 00000000 000000014 测试 hashCode
正常状态对象一开始是没有 hashCode 的第一次调用才生成。
撤销 - 调用对象 hashCode
调用了对象的 hashCode但偏向锁的对象 MarkWord 中存储的是线程 id如果调用 hashCode 会导致偏向锁被撤销。
轻量级锁会在锁记录中记录 hashCode重量级锁会在 Monitor 中记录 hashCode
在调用 hashCode 后使用偏向锁记得去掉 -XX:-UseBiasedLocking。
输出
11:22:10.386 c.TestBiased [main] - 调用 hashCode:1778535015
11:22:10.391 c.TestBiased [t1] - synchronized 前
00000000 00000000 00000000 01101010 00000010 01001010 01100111 00000001
11:22:10.393 c.TestBiased [t1] - synchronized 中
00000000 00000000 00000000 00000000 00100000 11000011 11110011 01101000
11:22:10.393 c.TestBiased [t1] - synchronized 后
00000000 00000000 00000000 01101010 00000010 01001010 01100111 00000001撤销 - 其它线程使用对象
当有其它线程使用偏向锁对象时会将偏向锁升级为轻量级锁。 private static void test2() throws InterruptedException {Dog d new Dog();Thread t1 new Thread(() - {synchronized (d) {log.debug(ClassLayout.parseInstance(d).toPrintableSimple(true));}synchronized (TestBiased.class) {TestBiased.class.notify();}// 如果不用 wait/notify 使用 join 必须打开下面的注释// 因为t1 线程不能结束否则底层线程可能被 jvm 重用作为 t2 线程底层线程 id 是一样的/*try {System.in.read();} catch (IOException e) {e.printStackTrace();}*/}, t1);t1.start();Thread t2 new Thread(() - {synchronized (TestBiased.class) {try {TestBiased.class.wait();} catch (InterruptedException e) {e.printStackTrace();}}log.debug(ClassLayout.parseInstance(d).toPrintableSimple(true));synchronized (d) {log.debug(ClassLayout.parseInstance(d).toPrintableSimple(true));}log.debug(ClassLayout.parseInstance(d).toPrintableSimple(true));}, t2);t2.start();}输出
[t1] - 00000000 00000000 00000000 00000000 00011111 01000001 00010000 00000101
[t2] - 00000000 00000000 00000000 00000000 00011111 01000001 00010000 00000101
[t2] - 00000000 00000000 00000000 00000000 00011111 10110101 11110000 01000000
[t2] - 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001撤销 - 调用 wait/notify public static void main(String[] args) throws InterruptedException {Dog d new Dog();Thread t1 new Thread(() - {log.debug(ClassLayout.parseInstance(d).toPrintableSimple(true));synchronized (d) {log.debug(ClassLayout.parseInstance(d).toPrintableSimple(true));try {d.wait();} catch (InterruptedException e) {e.printStackTrace();}log.debug(ClassLayout.parseInstance(d).toPrintableSimple(true));}}, t1);t1.start();new Thread(() - {try {Thread.sleep(6000);} catch (InterruptedException e) {e.printStackTrace();}synchronized (d) {log.debug(notify);d.notify();}}, t2).start();}输出
[t1] - 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000101
[t1] - 00000000 00000000 00000000 00000000 00011111 10110011 11111000 00000101
[t2] - notify
[t1] - 00000000 00000000 00000000 00000000 00011100 11010100 00001101 11001010批量重偏向
如果对象虽然被多个线程访问但没有竞争这时偏向了线程 T1 的对象仍有机会重新偏向 T2重偏向会重置对象 的 Thread ID。
当撤销偏向锁阈值超过 20 次后jvm 会这样觉得我是不是偏向错了呢于是会在给这些对象加锁时重新偏向至加锁线程。 private static void test3() throws InterruptedException {VectorDog list new Vector();Thread t1 new Thread(() - {for (int i 0; i 30; i) {Dog d new Dog();list.add(d);synchronized (d) {log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));}}synchronized (list) {list.notify();}}, t1);t1.start();Thread t2 new Thread(() - {synchronized (list) {try {list.wait();} catch (InterruptedException e) {e.printStackTrace();}}log.debug( );for (int i 0; i 30; i) {Dog d list.get(i);log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));synchronized (d) {log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));}log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));}}, t2);t2.start();}输出
[t1] - 0 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 1 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 2 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 3 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 4 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 5 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 6 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 7 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 8 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 9 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 10 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 11 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 12 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 13 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 14 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 15 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 16 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 17 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 18 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 19 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 20 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 21 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 22 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 23 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 24 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 25 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 26 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 27 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 28 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t1] - 29 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] -
[t2] - 0 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 0 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 1 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 1 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 1 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 2 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 2 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 2 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 3 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 3 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 4 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 4 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 4 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 5 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 5 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 5 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 6 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 6 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 6 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 7 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 7 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 8 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 8 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 9 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 9 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 9 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 10 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 10 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 10 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 11 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 11 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 11 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 12 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 12 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 12 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 13 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 13 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 13 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 14 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 14 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 14 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 15 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 15 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 15 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 16 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 16 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 16 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 17 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 17 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 17 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 18 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 18 00000000 00000000 00000000 00000000 00100000 01011000 11110111 00000000
[t2] - 18 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001
[t2] - 19 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 19 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 19 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 20 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 20 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 20 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 21 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 21 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 21 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 22 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 22 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 22 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 23 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 23 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 23 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 24 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 24 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 24 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 25 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 25 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 25 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 26 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 26 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 26 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 27 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 27 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 27 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 28 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 28 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 28 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 29 00000000 00000000 00000000 00000000 00011111 11110011 11100000 00000101
[t2] - 29 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101
[t2] - 29 00000000 00000000 00000000 00000000 00011111 11110011 11110001 00000101批量撤销
当撤销偏向锁阈值超过 40 次后jvm 会这样觉得自己确实偏向错了根本就不该偏向。于是整个类的所有对象都会变为不可偏向的新建的对象也是不可偏向的。 private static void test4() throws InterruptedException {VectorDog list new Vector();int loopNumber 39;t1 new Thread(() - {for (int i 0; i loopNumber; i) {Dog d new Dog();list.add(d);synchronized (d) {log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));}}LockSupport.unpark(t2);}, t1);t1.start();t2 new Thread(() - {LockSupport.park();log.debug( );for (int i 0; i loopNumber; i) {Dog d list.get(i);log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));synchronized (d) {log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));}log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));}LockSupport.unpark(t3);}, t2);t2.start();t3 new Thread(() - {LockSupport.park();log.debug( );for (int i 0; i loopNumber; i) {Dog d list.get(i);log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));synchronized (d) {log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));}log.debug(i \t ClassLayout.parseInstance(d).toPrintableSimple(true));}}, t3);t3.start();t3.join();log.debug(ClassLayout.parseInstance(new Dog()).toPrintableSimple(true));}
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