CODEWITHSUNDEEP
javamultithreading
overexchange
overexchange

Reputation: 1

Setting interrupt flag on a thread

For the below code,

static class SleeperThread  extends Thread {
  public void run() {
    int c;
    try {
        c = System.in.read();
    }
    ...
  }
}

As mentioned in this bug, If a thread is blocked on IO(System.in.read();), then, Can't the interrupt flag be set on that thread, by another thread?

Upvotes: 1

Views: 174

Answers (1)

ParkerHalo
ParkerHalo

Reputation: 4430

Since System.in doesn't react on Thread interrupts you have to implement something like it yourself.

To do that you can use the method available() of the System.in (of InputStream).

It might look somewhat like this:

class ReadWithInterrupt extends Thread{
    private byte[] result = null;
    public byte[] getResult(){
        return result;
    }

    @Override
    public void run(){
        try{
            while(true){
                if (this.isInterrupted()){
                    System.out.println("An interrupt occurred");
                    break;
                }
                int available = System.in.available();
                if (available>0){
                    result = new byte[available];
                    System.in.read(result, 0, available);
                    break;
                }
                else
                    Thread.sleep(500);
            }

        }
        catch (IOException e){
            e.printStackTrace();
        }
        catch (InterruptedException e){
            System.out.println("An interrupt occurred");
        }
    }
}

Upvotes: 1

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