The ultimate guide to Ruby concurrency interviews. Developed by FAANG engineers, this course covers Monitors, Deferred Callbacks and problem-solving strategies for Reader-Writer and Dining Philosopher Problems.

Concurrency in Ruby is one of the most complex and advanced topics brought up during senior engineering interviews. Knowledge of concurrency and multithreading can put interviewees at a considerable advantage. This course lays the foundations of advanced concurrency and multithreading and explains concepts such as Monitors and Deferred Callbacks in depth. It also builds simple and complete solutions to popular concurrency problems that can be asked about in interviews like the Reader-Writer Problem and the Dining Philosopher Problem. While prior knowledge of concurrency is not required to follow through with this course, familiarity with the basics of Ruby would be helpful.

Ruby Concurrency for Senior Engineering Interviews

<div class="card-quiz">
   # Question # 1
    <div class="qtn">
        <p>Consider the code snippet below:</p>

```ruby
Thread.new do
  Thread.stop()
end

"Main thread exiting"
```
 </div>
</div>

Program hangs because the child is stopped

Program exits because the main thread exits

<p>What is the output of the program?</p>


Thread.new do
  Thread.stop()
end

"Main thread exiting"

<div class="card-quiz">
   # Question # 2
    <div class="qtn">
        <p>Consider the snippet below:</p>

```ruby
mutex = Mutex.new

Thread.new do
  mutex.lock()
  raise "Ka Boom"
end

# wait for child thread to exit
sleep(2)
puts("Is mutex locked #{mutex.locked?}")
mutex.lock()
```
</div>
</div>

<div>
   # Question # 1
    <div>
        <p>Consider the code snippet below:</p>

```ruby
Thread.new do
  Thread.stop()
end

"Main thread exiting"
```
 </div>
</div>

<div>
   # Question # 2
    <div>
        <p>Consider the snippet below:</p>

```ruby
mutex = Mutex.new

Thread.new do
  mutex.lock()
  raise "Ka Boom"
end

# wait for child thread to exit
sleep(2)
puts("Is mutex locked #{mutex.locked?}")
mutex.lock()
```
</div>
</div>

Questions relating to the Threading API are covered in this lesson.

The Basics

API Overview

Brief Intro to Asynchronous Programming

Interview Practice Problems

Bonus Questions

Epilogue

Quiz 2

Question # 1