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">
   <h4>Question # 1</h4>
    <div class="qtn">
     <p>Consider the program below:</p>

```ruby
mutex1 = Mutex.new
mutex2 = Mutex.new

cv = ConditionVariable.new

thread = Thread.new do
  mutex2.synchronize {
    mutex1.synchronize {
      cv.wait(mutex2)
    }
  }
  puts "child thread exiting"
end

# wait for child thread to wait on condition variable
sleep(2)

mutex2.synchronize do
  cv.signal()
end

thread.join()

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


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

```ruby
mutex1 = Mutex.new
mutex2 = Mutex.new

cv = ConditionVariable.new

thread = Thread.new do
  mutex2.synchronize {
    mutex1.synchronize {
      cv.wait(mutex2)
    }
  }
  puts "child thread exiting"
end

# wait for child thread to wait on condition variable
sleep(2)

mutex2.synchronize do
  cv.signal()
end

thread.join()

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


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

```ruby
mutex1 = Mutex.new
mutex2 = Mutex.new

cv = ConditionVariable.new

thread = Thread.new do
  mutex2.synchronize {
    mutex1.synchronize {
      cv.wait(mutex2)
    }
  }
  puts "child thread exiting"
end

# wait for child thread to wait on condition variable
sleep(2)

mutex2.synchronize do
  cv.signal()
end

thread.join()

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


Questions relating to the Threading API covered in this chapter.

The Basics

API Overview

Brief Intro to Asynchronous Programming

Interview Practice Problems

Bonus Questions

Epilogue

Quiz 4

Question # 1