Is this a race condition problem?
Each threads increment the readStringCount.
Once the while loop detects that count is no longer greater than readStringCount,
and exits it the sends an interrupt to the 3 threads but in the meantime they may have already entered a new loop.
In my program the readStringCount ends up being greater than count in every run.
package com.codegym.task.task16.task1628;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
public class Solution {
public static volatile AtomicInteger readStringCount = new AtomicInteger(0);
public static volatile BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
public static void main(String[] args) throws IOException {
// Read string count
int count = Integer.parseInt(reader.readLine());
// Init threads
ReaderThread consoleReader1 = new ReaderThread();
ReaderThread consoleReader2 = new ReaderThread();
ReaderThread consoleReader3 = new ReaderThread();
consoleReader1.start();
consoleReader2.start();
consoleReader3.start();
while (count > readStringCount.get()) {
}
consoleReader1.interrupt();
consoleReader2.interrupt();
consoleReader3.interrupt();
System.out.println("#1:" + consoleReader1);
System.out.println("#2:" + consoleReader2);
System.out.println("#3:" + consoleReader3);
reader.close();
}
public static class ReaderThread extends Thread {
private List<String> result = new ArrayList<>();
public void run() {
//write your code here
try {
String input = reader.readLine();
result.add(input);
readStringCount.set(readStringCount.get() + 1);
}
catch (IOException e) {
}
}
@Override
public String toString() {
return result.toString();
}
}
}