Learn from the beginning multithreading-2.24 modifying the Monitor's effect on synchronization

In this chapter we will discuss the effect of modifying the monitor on synchronization.

1. Do not modify the monitor, sync the

Package com.ray.deepintothread.ch02.topic_24;/** * * @author Raylee * */public class Synchofstaticinnerclass {public stat IC void Main (string[] args) {thread thread = new Thread (new Runnable () {public void run () {Myservice.updatea ()}}); Thread.Start (); Thread thread2 = new Thread (new Runnable () {public void run () {myservice.updateb ()}); Thread2.start ();}} Class MyService {private static int id = 0;private static String lock = "A";p ublic static void UpdateA () {Synchronized (LO CK) {for (int i = 0; i < i++) {System.out.println ("Thread name:" + Thread.CurrentThread (). GetName () + "ID:" + id++ try {thread.sleep;} catch (Interruptedexception e) {e.printstacktrace ()}}} public static void Updateb () {synchronized (lock) {for (int i = 0; i <; i++) {System.out.println ("Thread name:" + Th Read.currentthread (). GetName () + "ID:" + id++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}}

Output:

Thread name:thread-0 id:0
Thread name:thread-0 id:1
Thread name:thread-0 Id:2
Thread name:thread-0 Id:3
Thread name:thread-0 Id:4
Thread name:thread-0 Id:5
Thread name:thread-0 Id:6
Thread name:thread-0 Id:7
Thread name:thread-0 Id:8
Thread name:thread-0 Id:9
Thread name:thread-1 Id:10
Thread name:thread-1 id:11
Thread name:thread-1 Id:12
Thread name:thread-1 id:13
Thread name:thread-1 id:14
Thread name:thread-1 id:15
Thread name:thread-1 id:16
Thread name:thread-1 id:17
Thread name:thread-1 id:18
Thread name:thread-1 id:19

2. When the modification occurs, the synchronization becomes asynchronous when the thread starts

Package com.ray.deepintothread.ch02.topic_24;/** * * @author Raylee * */public class SynchOfStaticInnerClass2 {public STA tic void Main (string[] args) {thread thread = new Thread (new Runnable () {public void run () {Myservice2.updatea ()}); Thread.Start (); Thread thread2 = new Thread (new Runnable () {public void run () {myservice2.updateb ()}); Thread2.start ();}} Class MyService2 {private static int a = 0;private static object lock = new Object ();p ublic static void UpdateA () {Synchro Nized (lock) {lock = new Object (); for (int i = 0; i < i++) {System.out.println ("Thread name:" + Thread.currentthrea D (). GetName () + "A:" + a++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}} public static void Updateb () {synchronized (lock) {for (int i = 0; i <; i++) {System.out.println ("Thread name:" + Th Read.currentthread (). GetName () + "A:" + a++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}}

Output:

Thread name:thread-1 a:0
Thread name:thread-0 a:0
Thread name:thread-1 a:1
Thread name:thread-0 A:2
Thread name:thread-0 A:3
Thread name:thread-1 A:4
Thread name:thread-0 A:5
Thread name:thread-1 A:6
Thread name:thread-0 A:7
Thread name:thread-1 A:8
Thread name:thread-1 A:9
Thread name:thread-0 A:10
Thread name:thread-0 a:11
Thread name:thread-1 A:12
Thread name:thread-1 a:13
Thread name:thread-0 a:14
Thread name:thread-0 a:15
Thread name:thread-1 a:16
Thread name:thread-0 a:17
Thread name:thread-1 a:18

Here the reason is unclear, I have tried in for each execution once on the output of the corresponding lock, are the same, but, from the output is already visible, in fact, it is not synchronized

3. There is no effect on synchronization after a period of time when the thread has started to change

Package com.ray.deepintothread.ch02.topic_24;/** * * @author Raylee * */public class SYNCHOFSTATICINNERCLASS3 {public STA tic void Main (string[] args) {thread thread = new Thread (new Runnable () {public void run () {Myservice3.updatea ()}); Thread.Start (); Thread thread2 = new Thread (new Runnable () {public void run () {myservice3.updateb ()}); Thread2.start ();}} Class MyService3 {private static int a = 0;private static object lock = new Object ();p ublic static void UpdateA () {Synchro Nized (Lock) {for (int i = 0; i <; i++) {if (i = = 5) {//Change the monitor to a delay of lock = new Object ();} System.out.println ("Thread name:" + Thread.CurrentThread (). GetName () + "A:" + a++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}} public static void Updateb () {synchronized (lock) {for (int i = 0; i <; i++) {System.out.println ("Thread name:" + Th Read.currentthread (). GetName () + "A:" + a++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}}

Output:

Thread name:thread-0 a:0
Thread name:thread-0 a:1
Thread name:thread-0 A:2
Thread name:thread-0 A:3
Thread name:thread-0 A:4
Thread name:thread-0 A:5
Thread name:thread-0 A:6
Thread name:thread-0 A:7
Thread name:thread-0 A:8
Thread name:thread-0 A:9
Thread name:thread-1 A:10
Thread name:thread-1 a:11
Thread name:thread-1 A:12
Thread name:thread-1 a:13
Thread name:thread-1 a:14
Thread name:thread-1 a:15
Thread name:thread-1 a:16
Thread name:thread-1 a:17
Thread name:thread-1 a:18
Thread name:thread-1 a:19

Package com.ray.deepintothread.ch02.topic_24;/** * * @author Raylee * */public class SynchOfStaticInnerClass4 {public STA tic void Main (string[] args) {thread thread = new Thread (new Runnable () {public void run () {try {Myservice4.updatea ();} CA TCH (interruptedexception e) {e.printstacktrace ();}}); Thread.Start (); Thread thread2 = new Thread (new Runnable () {public void run () {myservice4.updateb ()}); Thread2.start ();}} Class MyService4 {private static int a = 0;private static object lock = new Object ();p ublic static void UpdateA () throws I nterruptedexception {synchronized (lock) {thread.sleep (300);//delay the change to the monitor .lock = new Object (), for (int i = 0; i < i++) {System.out.println ("Thread name:" + Thread.CurrentThread (). GetName () + "A:" + a++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}} public static void Updateb () {synchronized (lock) {for (int i = 0; i <; i++) {System.out.println ("Thread name:" + Th Read.currentthread (). GetName () + "A:" + a++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}}

Output:

Thread name:thread-0 a:0
Thread name:thread-0 a:1
Thread name:thread-0 A:2
Thread name:thread-0 A:3
Thread name:thread-0 A:4
Thread name:thread-0 A:5
Thread name:thread-0 A:6
Thread name:thread-0 A:7
Thread name:thread-0 A:8
Thread name:thread-0 A:9
Thread name:thread-1 A:10
Thread name:thread-1 a:11
Thread name:thread-1 A:12
Thread name:thread-1 a:13
Thread name:thread-1 a:14
Thread name:thread-1 a:15
Thread name:thread-1 a:16
Thread name:thread-1 a:17
Thread name:thread-1 a:18
Thread name:thread-1 a:19

4. Modify the properties of the monitor object without affecting synchronization

Package com.ray.deepintothread.ch02.topic_24;/** * * @author Raylee * */public class SYNCHOFSTATICINNERCLASS5 {public STA tic void Main (string[] args) {MyService5 myService5 = new MyService5 (); Thread thread = new Thread (new Runnable () {public void run () {try {Myservice5.updatea ()} catch (Interruptedexception e) { E.printstacktrace ();}}); Thread.Start (); Thread thread2 = new Thread (new Runnable () {public void run () {myservice5.updateb ()}); Thread2.start ();}}  Class MyService5 {private static int a = 0;private static Monitor lock;public MyService5 () {lock = new monitor (); lock.id = 1;}  public void UpdateA () throws Interruptedexception {synchronized (lock) {lock.id = 2;//Modify the properties of the object Thread.Sleep (+); for (int i = 0; I < 10; i++) {System.out.println ("Thread name:" + Thread.CurrentThread (). GetName () + "A:" + a++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}} public void Updateb () {synchronized (lock) {for (int i = 0; i <; i++) {System.out.println ("ThreadName: "+ Thread.CurrentThread (). GetName () +" A: "+ a++); try {thread.sleep (50);} catch (Interruptedexception e) {e.printstacktrace ();}}}} Class Monitor {public int id = 0;}

Output:

Thread name:thread-0 a:0
Thread name:thread-0 a:1
Thread name:thread-0 A:2
Thread name:thread-0 A:3
Thread name:thread-0 A:4
Thread name:thread-0 A:5
Thread name:thread-0 A:6
Thread name:thread-0 A:7
Thread name:thread-0 A:8
Thread name:thread-0 A:9
Thread name:thread-1 A:10
Thread name:thread-1 a:11
Thread name:thread-1 A:12
Thread name:thread-1 a:13
Thread name:thread-1 a:14
Thread name:thread-1 a:15
Thread name:thread-1 a:16
Thread name:thread-1 a:17
Thread name:thread-1 a:18
Thread name:thread-1 a:19

Summary: In this chapter we summarize the effects of several modifications to the monitor on synchronization.

This chapter is here, thank you.

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Catalog: http://blog.csdn.net/raylee2007/article/details/51204573

Learn from the beginning multithreading-2.24 modifying the Monitor's effect on synchronization