ReadWriteLock conditions

[hidden pecan]

I want to have a readwrite lock where i have in a writelock block a condition.signallAll and a readlock block with a condition wait. Since there is no shared condition between this two, i need help to do this

[wooden nebula]

<@&987246399047479336> please have a look, thanks.

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the read and write locks in a ReadWriteLock, you cannot directly use a Condition object to signal or wait for threads in different lock modes.

However, you can achieve similar functionality by using separate Condition objects for the read and write locks. Here's an example of how you can implement this:

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public class CustomReadWriteLock {
    private final ReadWriteLock lock = new ReentrantReadWriteLock();
    private final Condition writeCondition = lock.writeLock().newCondition();
    private final Condition readCondition = lock.readLock().newCondition();

    public void writeOperation() {
        lock.writeLock().lock();
        try {
            // Perform write operation
            System.out.println("Performing write operation");
            
            // Signal all waiting threads in read mode
            readCondition.signalAll();
        } finally {
            lock.writeLock().unlock();
        }
    }

    public void readOperation() throws InterruptedException {
        lock.readLock().lock();
        try {
            // Perform read operation
            System.out.println("Performing read operation");
            
            // Wait for signal from write thread
            writeCondition.await();
        } finally {
            lock.readLock().unlock();
        }
    }
}

In this example, we have separate Condition objects writeCondition and readCondition for the write and read locks respectively. The writeOperation method performs a write operation and signals all waiting threads in read mode using readCondition.signalAll(). The readOperation method performs a read operation and waits for a signal from the write thread using writeCondition.await().

This way, you can achieve signaling and waiting between threads in different lock modes using separate Condition objects in a custom implementation of ReadWriteLock.