Java Community | Help. Code. Learn.•10mo ago

could you explain what this code is doing in terms of implementing the problem in the picture?

like what is the logic is

5 Replies

JavaBot•10mo ago

⌛ This post has been reserved for your question.

Hey @SidKid! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically marked as dormant after 300 minutes of inactivity.

TIP: Narrow down your issue to simple and precise questions to maximize the chance that others will reply in here.

SidKidOP•10mo ago

class Counter {  
 
    private int count = 0;  
 
   
 
    public int getCount() {  
 
        return count;  
 
    }  
 
   
 
    public void increment() {  
 
        count++;  
 
    }  
 
   
 
    //The synchronized keyword makes this method thread-safe.  
 
    public synchronized void synchronizedIncrement() {  
 
        count++;  
 
    }  
 
   
 
   
 
    public void brokenIncrement() {  
 
        int temp = count; // Read  
 
        count = temp + 1; // Write  
 
    }  
 
   
 
    public void betterIncrement() {  
 
        count++;  
 
    }  
 
}

class Counter {  
 
    private int count = 0;  
 
   
 
    public int getCount() {  
 
        return count;  
 
    }  
 
   
 
    public void increment() {  
 
        count++;  
 
    }  
 
   
 
    //The synchronized keyword makes this method thread-safe.  
 
    public synchronized void synchronizedIncrement() {  
 
        count++;  
 
    }  
 
   
 
   
 
    public void brokenIncrement() {  
 
        int temp = count; // Read  
 
        count = temp + 1; // Write  
 
    }  
 
   
 
    public void betterIncrement() {  
 
        count++;  
 
    }  
 
}

public class RaceConditionExample {  
 
   
 
    public static void main(String[] args) throws InterruptedException {  
 
        int numThreads = 1000;  
 
        int numIncrements = 1000;  
 
   
 
        // Example 1: Demonstrating the race condition with brokenIncrement()  
 
        Counter counter1 = new Counter();  
 
        Thread[] threads1 = new Thread[numThreads];  
 
   
 
        for (int i = 0; i < numThreads; i++) {  
 
            threads1[i] = new Thread(() -> {  
 
                for (int j = 0; j < numIncrements; j++) {  
 
                    counter1.brokenIncrement();  
 
                }  
 
            });  
 
            threads1[i].start();  
 
        }  
 
   
 
        for (Thread thread : threads1) {  
 
            thread.join(); // Wait for all threads to finish  
 
        }  
 
   
 
        System.out.println("Race Condition Example (brokenIncrement): Expected: " + (numThreads * numIncrements) + ", Actual: " + counter1.getCount());

public class RaceConditionExample {  
 
   
 
    public static void main(String[] args) throws InterruptedException {  
 
        int numThreads = 1000;  
 
        int numIncrements = 1000;  
 
   
 
        // Example 1: Demonstrating the race condition with brokenIncrement()  
 
        Counter counter1 = new Counter();  
 
        Thread[] threads1 = new Thread[numThreads];  
 
   
 
        for (int i = 0; i < numThreads; i++) {  
 
            threads1[i] = new Thread(() -> {  
 
                for (int j = 0; j < numIncrements; j++) {  
 
                    counter1.brokenIncrement();  
 
                }  
 
            });  
 
            threads1[i].start();  
 
        }  
 
   
 
        for (Thread thread : threads1) {  
 
            thread.join(); // Wait for all threads to finish  
 
        }  
 
   
 
        System.out.println("Race Condition Example (brokenIncrement): Expected: " + (numThreads * numIncrements) + ", Actual: " + counter1.getCount());

// Example 2: Showing a correct implementation with synchronizedIncrement()  
 
        Counter counter2 = new Counter();  
 
        Thread[] threads2 = new Thread[numThreads];  
 
   
 
        for (int i = 0; i < numThreads; i++) {  
 
            threads2[i] = new Thread(() -> {  
 
                for (int j = 0; j < numIncrements; j++) {  
 
                    counter2.synchronizedIncrement();  
 
                }  
 
            });  
 
            threads2[i].start();  
 
        }  
 
   
 
        for (Thread thread : threads2) {  
 
            thread.join();  
 
        }  
 
   
 
        System.out.println("Synchronized Example: Expected: " + (numThreads * numIncrements) + ", Actual: " + counter2.getCount()); 

// Example 3: Showing a correct implementation with betterIncrement() (atomic)  
 
        Counter counter3 = new Counter();  
 
        Thread[] threads3 = new Thread[numThreads];  
 
   
 
        for (int i = 0; i < numThreads; i++) {  
 
            threads3[i] = new Thread(() -> {  
 
                for (int j = 0; j < numIncrements; j++) {  
 
                    counter3.betterIncrement();  
 
                }  
 
            });  
 
            threads3[i].start();  
 
        }  
 
   
 
        for (Thread thread : threads3) {  
 
            thread.join();  
 
        }  
 
   
 
        System.out.println("Atomic Example: Expected: " + (numThreads * numIncrements) + ", Actual: " + counter3.getCount());  
 
   
 
    }  
 
}

// Example 2: Showing a correct implementation with synchronizedIncrement()  
 
        Counter counter2 = new Counter();  
 
        Thread[] threads2 = new Thread[numThreads];  
 
   
 
        for (int i = 0; i < numThreads; i++) {  
 
            threads2[i] = new Thread(() -> {  
 
                for (int j = 0; j < numIncrements; j++) {  
 
                    counter2.synchronizedIncrement();  
 
                }  
 
            });  
 
            threads2[i].start();  
 
        }  
 
   
 
        for (Thread thread : threads2) {  
 
            thread.join();  
 
        }  
 
   
 
        System.out.println("Synchronized Example: Expected: " + (numThreads * numIncrements) + ", Actual: " + counter2.getCount()); 

// Example 3: Showing a correct implementation with betterIncrement() (atomic)  
 
        Counter counter3 = new Counter();  
 
        Thread[] threads3 = new Thread[numThreads];  
 
   
 
        for (int i = 0; i < numThreads; i++) {  
 
            threads3[i] = new Thread(() -> {  
 
                for (int j = 0; j < numIncrements; j++) {  
 
                    counter3.betterIncrement();  
 
                }  
 
            });  
 
            threads3[i].start();  
 
        }  
 
   
 
        for (Thread thread : threads3) {  
 
            thread.join();  
 
        }  
 
   
 
        System.out.println("Atomic Example: Expected: " + (numThreads * numIncrements) + ", Actual: " + counter3.getCount());  
 
   
 
    }  
 
}

^thats all one code, discord was saying it is too long to be in one block

JavaBot•10mo ago

💤 Post marked as dormant

This post has been inactive for over 300 minutes, thus, it has been archived. If your question was not answered yet, feel free to re-open this post or create a new one. In case your post is not getting any attention, you can try to use /help ping. Warning: abusing this will result in moderative actions taken against you.

dan1st•10mo ago

there is no read difference between brokenIncrement and betterIncrement - both aren't thread safe and well the code is trying to increment numbers a given amount of time but due to it not being thread safe, counter1 and counter3 might be too low

JavaBot•10mo ago

💤 Post marked as dormant

This post has been inactive for over 300 minutes, thus, it has been archived. If your question was not answered yet, feel free to re-open this post or create a new one. In case your post is not getting any attention, you can try to use /help ping. Warning: abusing this will result in moderative actions taken against you.

Gaming

Programming

could you explain what this code is doing in terms of implementing the problem in the picture?

Did you find this page helpful?