Lock Implementations in Java |

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Today we are going to explore Locks in Java.
Locks act like a token required to access a shared resource. If a thread has the token , it can access the resource. If not, it must wait until the token is available.
In this video we have explained what is a Reentrant, ReadWrite and Stamped Locks. With Real World Examples and Code Snippets.
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You can access the specific topic from the chapters given below
0:00 Introduction
0:23 What is #ReentrantLock?
0:48 Real World Example of ReentrantLock
1:11 #Code Implementation
2:00 Code #Walkthrough
2:54 Why #finally block to #release the #Locks?
3:34 What is #ReadWriteLock?
4:11 What is Exclusive Access?
4:40 Code Implementation
2:00 Code Walkthrough
5:23 Another Real Example of Locks
6:34 Use case for ReadWriteLock
7:29 What is StampedLock?
7:51 Real World Example
8:21 Purpose of Optimistic Read Locks
8:35 Code Implementation/Walkthrough
10:34 Use case for StampedLock
11:10 ReadWrite VS Stamped Lock
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Опубликовано:

28 июн 2024

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Комментарии : 3

@IndianPoliticsMemeShow 6 месяцев назад

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@Werewolf5684 25 дней назад

Hey I am facing some problem while implementing readWriteLock. Can you please let me know what is the problem I am making here So there is a class which having some value [so it is a critical section], Now from our main class I am creating 5 read thread to read the data from that critical section 5 times and 5 write thread to update the data. so the expectation is I want to have same value for a particular thread for every iteration, and while updating the value another thread should read the value import java.util.concurrent.locks.ReentrantReadWriteLock; public class Node extends ReentrantReadWriteLock { private T value; public Node(T value) { this.value = value; } public void setValue(T value) { this.value = value; } public T getValue() { return this.value; } } import java.util.concurrent.ThreadLocalRandom; public class ReadWriteLockDemo2 { private static Node resource = new Node(5); public static void main(String[] args) { for (int i = 0 ; i < 5 ; i++) { new Thread(() -> { resource.readLock(); try { for (int j = 0 ; j < 5 ; j++) { System.out.println(Thread.currentThread().getName() + " is reading the data " + resource.getValue()); try { Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 5000)); } catch (InterruptedException e) { throw new RuntimeException(e); } } } finally { resource.readLock().unlock(); } }).start(); } for (int i = 0 ; i < 5 ; i++) { new Thread(() -> { resource.writeLock(); try { int value = ThreadLocalRandom.current().nextInt(1, 100); System.out.println(Thread.currentThread().getName() + " is writing the data with " + value); resource.setValue(value); try { Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 5000)); } catch (InterruptedException e) { throw new RuntimeException(e); } } finally { resource.writeLock().unlock(); } }).start(); } } } I feel like locks are not working properly can you check I am getting first time iteration all read are working then all write are working and updating quickly [updating the value at the same time] where as they have to wait because that's a write lock but they are not waiting. Also I am getting this 2 error not sure where I am making this mistake, "attempt to unlock read lock, not locked by current thread"

@TheRealLazyProgrammer 7 дней назад

Your current code can lead to a deadlock scenario, If a read thread holds the read lock and a write thread tries to acquire the write lock, they’ll block each other indefinitely. Additionally, You have extended ReentrantReadWriteLock in your Node class. This is not the correct way to use it. Instead, create an instance of ReentrantReadWriteLock within your Node class and use it for synchronization. Can you try below code: import java.util.concurrent.locks.ReentrantReadWriteLock; class Node { private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); private T value; public Node(T value) { this.value = value; } public void setValue(T value) { lock.writeLock().lock(); try { this.value = value; } finally { lock.writeLock().unlock(); } } public T getValue() { lock.readLock().lock(); try { return value; } finally { lock.readLock().unlock(); } } } public class ReadWriteLockDemo { public static void main(String[] args) { Node resource = new Node(5); // Create read threads for (int i = 0; i < 5; i++) { new Thread(() -> { for (int j = 0; j < 5; j++) { System.out.println(Thread.currentThread().getName() + " is reading the data: " + resource.getValue()); try { Thread.sleep(1000); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } } }).start(); } // Create write threads for (int i = 0; i < 5; i++) { new Thread(() -> { int value = (int) (Math.random() * 100); System.out.println(Thread.currentThread().getName() + " is writing the data with value: " + value); resource.setValue(value); try { Thread.sleep(1000); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } }).start(); } } }