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Aug 25th, 2008

How do I pause a thread indefinitely?

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How do I pause a thread indefinitely? im creating a game and i need a thread to be paused when the user pauses the game and the thread will resume when the user unpauses the game. =) im using thread.sleep right now but it requires an integer to determine how long it will pause, but since i dont know how long the user is gonna pause the game, i think that method wont do me any good.

esy928

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Aug 25th, 2008

Re: How do I pause a thread indefinitely?

this might be an option

Java Syntax (Toggle Plain Text)
public static void pauze(){
     while(!isContinue()){
           //keep the duration small, so the game will be resumed shortly after 
          // the user presses resume
           sleep(500);
     }
}
 
public static boolean isContinue(){
boolean returnVal = false;
// this method checks in the rest of your code, whether or not your user pressed resume
//returnVal = ....
 
return returnVal;
}
public static void pauze(){
     while(!isContinue()){
           //keep the duration small, so the game will be resumed shortly after 
          // the user presses resume
           sleep(500);
     }
}

public static boolean isContinue(){
boolean returnVal = false;
// this method checks in the rest of your code, whether or not your user pressed resume
//returnVal = ....

return returnVal;
}

stultuske

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Aug 25th, 2008

Re: How do I pause a thread indefinitely?

thanks =) ill give it a try

esy928

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Aug 25th, 2008

Re: How do I pause a thread indefinitely?

Click to Expand / Collapse Quote originally posted by stultuske ...

this might be an option
Java Syntax (Toggle Plain Text)
public static void pauze(){
     while(!isContinue()){
           //keep the duration small, so the game will be resumed shortly after 
          // the user presses resume
           sleep(500);
     }
}
 
public static boolean isContinue(){
boolean returnVal = false;
// this method checks in the rest of your code, whether or not your user pressed resume
//returnVal = ....
 
return returnVal;
}
public static void pauze(){ while(!isContinue()){ //keep the duration small, so the game will be resumed shortly after // the user presses resume sleep(500); } } public static boolean isContinue(){ boolean returnVal = false; // this method checks in the rest of your code, whether or not your user pressed resume //returnVal = .... return returnVal; }

That's a very expensive method call. Your primary thread operation will have to wait for the calculation of isContinue() if you were to do it that way.

You may instead want to have a set method that sets the boolean expression in the loop to false so that the process can stop when it is desired for it to stop.

Alex Edwards

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Posting Shark

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Sep 14th, 2010

Logic to Pause Thread in JAVA

Actually there no ready maid method in Java to Pause the Thread directly by a single statement.
So, we have to do this by applying some Logic.
Here I apply that Run method chaked status of thread in every iteration of while loop untill all process has been completed And if in any iteration, PAUSE commnad is given than Current thread is sent in to sleep state for infinite time And when an invocation is given from MAIN thread (or Any other thread) the infinite look breaks and the Class thread continues to Run..
Look at this..

Java Syntax (Toggle Plain Text)
import java.util.logging.Level;
import java.util.logging.Logger;
public class PauseThreadDemo extends Thread{
    boolean isStop = false;
    boolean isCompleted = false;
    int i = 0;
 
    void setIsStop(boolean value){
        isStop = value;
    }
    boolean chkIsStop(){
        return isStop;
    }
 
    public void run(){
        while(!isCompleted){
            if(chkIsStop()){
                while(chkIsStop()){
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(PauseThreadDemo.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
            else{
                System.out.println("i = " + ++i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException ex) {
                    Logger.getLogger(PauseThreadDemo.class.getName()).log(Level.SEVERE, null, ex);
                }
                if(i==10){
                    isCompleted=true;
                }
            }
        }
    }
    public static void main(String[] args) throws InterruptedException {
 
		System.out.println("Main Thread Started..");
 
        PauseThreadDemo threadPauseDemo = new PauseThreadDemo();
        //Joined the Thread with the MAIN Thread
        try {
            threadPauseDemo.join();
        } catch (InterruptedException ex) {
            Logger.getLogger(PauseThreadDemo.class.getName()).log(Level.SEVERE, null, ex);
        }
        threadPauseDemo.start();
        System.out.println("Class Thread Started..");
 
        //Now after thread MAIN stop for 3 Seconds, we send the command to "threadPauseDemo" for waiting.
        Thread.sleep(3000);
        threadPauseDemo.setIsStop(true);
        System.out.println("Class thread stoped for 3 second..");
 
        //Now again after 3 seconds of MAIN thread, we send the command to "threadPauseDemo" to continue.
        Thread.sleep(3000);
        threadPauseDemo.setIsStop(false);
        System.out.println("Class thread Continues..");
    }
}
import java.util.logging.Level;
import java.util.logging.Logger;
public class PauseThreadDemo extends Thread{
    boolean isStop = false;
    boolean isCompleted = false;
    int i = 0;

    void setIsStop(boolean value){
        isStop = value;
    }
    boolean chkIsStop(){
        return isStop;
    }

    public void run(){
        while(!isCompleted){
            if(chkIsStop()){
                while(chkIsStop()){
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(PauseThreadDemo.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
            else{
                System.out.println("i = " + ++i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException ex) {
                    Logger.getLogger(PauseThreadDemo.class.getName()).log(Level.SEVERE, null, ex);
                }
                if(i==10){
                    isCompleted=true;
                }
            }
        }
    }
    public static void main(String[] args) throws InterruptedException {

		System.out.println("Main Thread Started..");

        PauseThreadDemo threadPauseDemo = new PauseThreadDemo();
        //Joined the Thread with the MAIN Thread
        try {
            threadPauseDemo.join();
        } catch (InterruptedException ex) {
            Logger.getLogger(PauseThreadDemo.class.getName()).log(Level.SEVERE, null, ex);
        }
        threadPauseDemo.start();
        System.out.println("Class Thread Started..");

        //Now after thread MAIN stop for 3 Seconds, we send the command to "threadPauseDemo" for waiting.
        Thread.sleep(3000);
        threadPauseDemo.setIsStop(true);
        System.out.println("Class thread stoped for 3 second..");

        //Now again after 3 seconds of MAIN thread, we send the command to "threadPauseDemo" to continue.
        Thread.sleep(3000);
        threadPauseDemo.setIsStop(false);
        System.out.println("Class thread Continues..");
    }
}

Most welcome for any type of Queries and Questionnaires and Suggestion.

<<snip>>

Last edited by Nick Evan; Sep 15th, 2010 at 4:37 am. Reason: Removed plug + mail

ankurgecr

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