Java Multithreading (v) mode-guarded suspension

• Guarded suspension

• Multithreading shares a resource, and the use of that resource is conditional.

  • Applicable environment

    • The occupancy of a shared resource is conditional rather than directly occupied.

  • Sample Example

    • Early Childhood Education collection: Three bear children preschool education, two preschool education before a long table, a total of only two homework.

  • Bear Boy

  • Package Guardedsuspension;public class Child implements Runnable {private Table table=null;private String myname=null; private int Cnt=1;public Child (Table table,string myName) {this.table=table;this.myname=myname;} @Overridepublic void Run () {while (cnt<=20) {Assignment a=new Assignment (this.myname,this.myname+ "_" +cnt); System.out.println (this.myname+ "+cnt"); Table.put (a); cnt++;try {thread.sleep (100);} catch (Interruptedexception e) {}}}}

  • Early childhood education

  • Package Guardedsuspension;public class Teacher implements Runnable{private final String myname;private final table table; private int state=0;public Teacher (table table, String name) {this.myname=name;this.table=table;} public void setState (int state) {this.state=state;} @Overridepublic void Run () {while (state==0) {assignment a=table.get (); if (a!=null) {A.setresult (MyName, "Y"); A.showresult ();}}}

  • Table

  •  package guardedsuspension;import java.util.linkedlist;//guarded objectpublic  class table {private final linkedlist<assignment> table=new linkedlist< Assignment> ();p rivate final int size;private int state=0;public table (int  size) {this.size=size;} Guarded methodpublic synchronized void put (assignment assignment) {while (Table.size ( ) {>=size) {try {wait ();}  catch  (interruptedexception e)  {}}table.add (Assignment); Notifyall ();} State change methodpublic synchronized assignment get () {Assignment ret=null; while (Table.size () <=0&&state==0) {try {wait ();//wait,  //if the table state is not last woken up in the main thread, it needs to be timed. } catch  (interruptedexception e)  {}}ret=table.poll (); Notifyall (); return ret;} Public void setstate (int state) {this.state=state;}} 

  • Homework

  • Package Guardedsuspension;public class Assignment {Private final string childname;private final string assignmentname; Private String Teachername= "N/A";p rivate string result= "N/a";p ublic assignment (String childname,string assignmentname ) {this.childname=childname;this.assignmentname=assignmentname;} public void Setresult (String teachername,string result) {This.teachername=teachername;this.result=result;} public void Showresult () {System.out.println ("Child:" +childname+ "to Teacher:" +teachername+ "job:" +assignmentname+ "to correct the result:" + result);}}

  • Test class

  • Package guardedsuspension;public class test {public static void main (String [] args]  {table table=new table (2); Teacher t1=new teacher (table, "T1"); Teacher t2=new teacher (table, "T2"); Child c1=new child (table, "C1"); Child c2=new child (table, "C2"); Child c3=new child (table, "C3"); Thread tchild1=new thread (C1); Thread tchild2=new thread (C2); Thread tchild3=new thread (C3); Thread tteacher1=new thread (t1); Thread tteacher2=new thread (T2); Tchild1.start (); Tchild2.start (); Tchild3.start (); TTeacher1.start (); Tteacher2.start ();//wait for the children to complete all locks also try {tchild1.join (); Tchild2.join (); Tchild3.join ();}  catch  (interruptedexception e)  {}//If wait is timed in the table class, you can set the table state Table.setstate (-1) directly; to inform. Synchronized (table) {System.out.println ("All children have left");//Set teacher State t1.setstate ( -1); T2.setstate (-1);//Get the table lock, change its state , and notify all who are waiting at the table to leave. Table.setstate ( -1); tablE.notifyall ();}}} 

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Java Multithreading (v) mode-guarded suspension