Process forking for parallelism in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a child process using fork.

Ruby

pid = [1]

Drag options to blanks, or click blank then click option'

Afork

Bspawn

Cfork()

Dexec

Attempts:

3 left

💡 Hint

Common Mistakes

Using spawn instead of fork.

Adding parentheses after fork.

In Ruby, fork creates a child process and returns its process ID.

2fill in blank

medium

Complete the code to check if the current process is the child process.

Ruby

if pid == [1]
  puts "Child process"
end

Drag options to blanks, or click blank then click option'

Anil

B0

C-1

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for nil instead of 0.

Using 1 or -1 as the child process ID.

In Ruby, fork returns 0 in the child process.

3fill in blank

hard

Fix the error in the code to wait for the child process to finish.

Ruby

Process.[1](pid)

Drag options to blanks, or click blank then click option'

Awaitpid

Bwait

Cwaitall

Dwaitchild

Attempts:

3 left

💡 Hint

Common Mistakes

Using Process.wait which waits for any child process.

Using non-existent methods like waitchild.

The correct method to wait for a specific child process is Process.waitpid.

4fill in blank

hard

Fill both blanks to create two child processes and print their PIDs.

Ruby

2.times do
  pid = [1]
  if pid == [2]
    puts "Child PID: #{Process.pid}"
    exit
  end
end

Drag options to blanks, or click blank then click option'

Afork

B0

C1

Dspawn

Attempts:

3 left

💡 Hint

Common Mistakes

Using spawn instead of fork.

Checking if pid == 1 instead of 0.

Use fork to create child processes and check if pid == 0 to identify the child.

5fill in blank

hard

Fill all three blanks to collect child PIDs and wait for them to finish.

Ruby

pids = []
3.times do
  pids << [1]
end

pids.each do |pid|
  Process.[2](pid)
  puts "Child process [3] finished"
end

Drag options to blanks, or click blank then click option'

Afork

Bwaitpid

CPID

Dwait

Attempts:

3 left

💡 Hint

Common Mistakes

Using wait instead of waitpid for specific PIDs.

Using incorrect words in the message.

Use fork to create child processes, waitpid to wait for each, and print a message when done.