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Java Monitors: Theory & Usage Quiz

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Questions and Answers

What does the notifyAll() method do in Java monitors?

Puts all threads waiting on the same monitor into a waiting state

Wakes up all the threads waiting on the same monitor held by the current thread (correct)

Wakes up all threads in the system, regardless of the monitor they are waiting on

Wakes up a single thread waiting on the same monitor held by the current thread

What is the purpose of the notifyAll() method in Java monitors?

To wake up all waiting threads on the same monitor (correct)

To wake up a specific waiting thread on the same monitor

To put all waiting threads into a waiting state

To wake up all threads in the system

When does a thread move from a waiting state to the RUNNABLE state after notifyAll() is called?

After notifyAll() is called, one random waiting thread moves to the RUNNABLE state

After notifyAll() is called, all waiting threads move to the RUNNABLE state (correct)

After notifyAll() is called, threads move to the WAITING state

After notifyAll() is called, threads move to a new state called AWAKENED

What happens to threads after notifyAll() is called in Java monitors?

Threads move from waiting states to compete for the monitor Signup and view all the answers

In which method of Java monitors does the last thing it does just before returning call notifyAll()?

MailboxMonitor’s take method Signup and view all the answers

Explain the relationship between a monitor and the notifyAll() method in Java.

The notifyAll() method in Java wakes up all the threads waiting on the same monitor held by the current thread, allowing them to move from either the WAITING or TIMED WAITING state to the RUNNABLE state. Signup and view all the answers

Discuss the categories of monitor methods in Java.

The categories of monitor methods in Java include wait(), wait(ms), wait(ms, ns), notify(), and notifyAll(). Signup and view all the answers

Describe the general form of a Java monitor method.

The general form of a Java monitor method includes the use of synchronized keyword to define a method or a block of code that can be accessed by only one thread at a time. Signup and view all the answers

What is the significance of designing a monitor method's 'guard' in Java?

Designing a monitor method's 'guard' in Java is significant for ensuring that the method is accessed only when certain conditions are met, helping to prevent spurious wake-ups and ensure correct synchronization. Signup and view all the answers

Compare Hoare's monitor with Java's monitor and highlight the differences.

Hoare's monitor and Java's monitor both provide a way to synchronize access to shared resources, but Hoare's monitor uses a different signaling mechanism compared to Java's monitor. Hoare's monitor uses a signal mechanism while Java's monitor uses notify() and notifyAll() methods for signaling. Signup and view all the answers