????publicvoidh() {
????// other operations should not be locked...
????System.out.println(Thread.currentThread().getName()
????+":not synchronized in h()");
????lock.lock();
????try{
????for(inti = 0; i < 5; i++) {
????System.out.println(Thread.currentThread().getName()
????+":synchronized in h()");
????try{
????TimeUnit.SECONDS.sleep(3);
????}catch(InterruptedException e) {
????e.printStackTrace();
????}
????}
????}finally{
????lock.unlock();
????}
????}
????publicstaticvoidmain(String[] args) {
????finalResource3 rs =newResource3();
????newThread() {
????publicvoidrun() {
????rs.f();
????}
????}.start();
????newThread() {
????publicvoidrun() {
????rs.g();
????}
????}.start();
????rs.h();
????}
????}
?????????
????Thread-0:not synchronized in f()
????Thread-0:synchronized in f()
????main:not synchronized in h()
????Thread-1:not synchronized in g()
????Thread-0:synchronized in f()
????Thread-0:synchronized in f()
????Thread-0:synchronized in f()
????Thread-0:synchronized in f()
????main:synchronized in h()
????main:synchronized in h()
????main:synchronized in h()
????main:synchronized in h()
????main:synchronized in h()
????Thread-1:synchronized in g()
????Thread-1:synchronized in g()
????Thread-1:synchronized in g()
????Thread-1:synchronized in g()
????Thread-1:synchronized in g()
????Resource4.java
????packagecom.zj.lock;
????importjava.util.concurrent.TimeUnit;
????importjava.util.concurrent.locks.Lock;
????importjava.util.concurrent.locks.ReentrantLock;
????publicclassResource4 {
????privateLocklock1=newReentrantLock();
????privateLocklock2=newReentrantLock();
????privateLocklock3=newReentrantLock();
????publicvoidf() {
????// other operations should not be locked...
????System.out.println(Thread.currentThread().getName()
????+":not synchronized in f()");
????lock1.lock();
????try{
????for(inti = 0; i < 5; i++) {
????System.out.println(Thread.currentThread().getName()
????+":synchronized in f()");
????try{
????TimeUnit.SECONDS.sleep(3);
????}catch(InterruptedException e) {
????e.printStackTrace();
????}
????}
????}finally{
????lock1.unlock();
????}
????}
????publicvoidg() {
????// other operations should not be locked...
????System.out.println(Thread.currentThread().getName()
????+":not synchronized in g()");
????lock2.lock();
????try{
????for(inti = 0; i < 5; i++) {
????System.out.println(Thread.currentThread().getName()
????+":synchronized in g()");
????try{
????TimeUnit.SECONDS.sleep(3);
????}catch(InterruptedException e) {
????e.printStackTrace();
????}
????}
????}finally{
????lock2.unlock();
????}
????}
????publicvoidh() {
????// other operations should not be locked...
????System.out.println(Thread.currentThread().getName()
????+":not synchronized in h()");
????lock3.lock();
????try{
????for(inti = 0; i < 5; i++) {
????System.out.println(Thread.currentThread().getName()
????+":synchronized in h()");
????try{
????TimeUnit.SECONDS.sleep(3);
????}catch(InterruptedException e) {
????e.printStackTrace();
????}
????}
????}finally{
????lock3.unlock();
????}
????}
????publicstaticvoidmain(String[] args) {
????finalResource4 rs =newResource4();
????newThread() {
????publicvoidrun() {
????rs.f();
????}
????}.start();
????newThread() {
????publicvoidrun() {
????rs.g();
????}
????}.start();
????rs.h();
????}
????}
?????????
????Thread-0:not synchronized in f()
????Thread-0:synchronized in f()
????main:not synchronized in h()
????main:synchronized in h()
????Thread-1:not synchronized in g()
????Thread-1:synchronized in g()
????Thread-0:synchronized in f()
????main:synchronized in h()
????Thread-1:synchronized in g()
????Thread-0:synchronized in f()
????main:synchronized in h()
????Thread-1:synchronized in g()
????Thread-0:synchronized in f()
????main:synchronized in h()
????Thread-1:synchronized in g()
????Thread-0:synchronized in f()
????main:synchronized in h()
????Thread-1:synchronized in g()
????synchronized??lock??????:
????Lock ?????????????????????? synchronized ???? JVM ??????????
????synchronized ???????????????????????JVM ??????????????????????????????????????????????????? Lock ?????????? JVM ?????????????????????????? finally ?????????????????????????
??????????????????????????￡??????????????????￡?synchronized???????????????????????????????????????synchronize???????????????????????ù?5.0???????????????????
????ReentrantLock:
????ReentrantLock????????????????????????????????????????Interrupt???????synchronized??????????Interrupt???????????????????????????￡??????????synchronized???????????????????????synchronized?????????????????ü????????ReentrantLock????????????
????Atomic:
??????????????????????????￡??????synchronized?????????????????????????????????Atomic???????????ReentrantLock??????????????????????????????????????δ??????????????Atomic???????????????????Ч???????????????Atomic????????