Learning Akka (Video 3)

The video tutorial covers key concepts in concurrent applications, including concurrency, parallelism, asynchronous and synchronous calls, blocking and nonblocking operations, and race conditions. It explains the differences between concurrency and parallelism, the nature of asynchronous and synchronous calls, and the implications of blocking and nonblocking threads. The video also delves into race conditions, highlighting how they occur and their impact on applications. The tutorial concludes with a summary of these concepts, preparing viewers for the next video on creating a Hello World app in Akure.

What is the main difference between concurrency and parallelism?

• Concurrency involves tasks running at the same time, while parallelism involves tasks overlapping in time.

• Concurrency involves tasks overlapping in time, while parallelism involves tasks running at the same time.

• Concurrency and parallelism are the same concepts.

• Concurrency is only possible on multicore processors.

Which of the following best describes a synchronous call?

• The caller can continue processing without waiting for the method to complete.

• The caller must wait for the method to return a value or throw an exception.

• The method call is always nonblocking.

• The method call is executed in parallel with other tasks.

How does an asynchronous call differ from a synchronous call?

• An asynchronous call is only used in single-threaded applications.

• An asynchronous call is always blocking.

• An asynchronous call allows the caller to continue processing after a finite number of steps.

• An asynchronous call requires the caller to wait for completion.

What is a characteristic of nonblocking threads?

• They can indefinitely delay other threads.

• They ensure no thread is indefinitely delayed.

• They are only used in synchronous systems.

• They always run in parallel.

What can cause a race condition in a multithreaded application?

• Multiple threads accessing a shared mutable state simultaneously.

• A single thread executing multiple tasks in sequence.

• Using only synchronous calls.

• Tasks running on a single core processor.