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How to Implement Multithreading in Ruby
In this article, we will learn how we can use multithreading in Ruby. We will take a couple of examples, where we will spawn two new threads and then perform some concurrent operations on them. In Ruby, we can create a new thread with the help of the Thread.new() function.
Example 1
Take a look at the following example to understand the nature of multiple threads and how they are executed in Ruby.
#!/usr/bin/ruby
# first method
def First_Method
a = 0
while a <= 5
puts "Thread1: #{a}"
# pause the execution of the current thread
sleep(1)
# incrementing the value of a
a = a + 1
end
end
# Second method
def Second_Method
b = 0
while b <= 3
puts "Thread2: #{b}"
# Pause the execution of the current thread
sleep(0.5)
# incrementing the value of b
b = b + 1
end
end
x = Thread.new{First_Method()}
y = Thread.new{Second_Method()}
# using Thread.join
x.join
y.join
puts "End"Output
On execution, it will produce the following output
Tuts1: 0 Tuts2: 0 Tuts2: 1 Tuts1: 1 Tuts2: 2 Tuts2: 3 Tuts1: 2 Tuts1: 3 Tuts1: 4 Tuts1: 5 End
In this example, we looked at two threads and how context switching is happening between them.
Example 2
Now let's take a look at how we can define some logs in between the functions to show the scope of the threads. Consider the code shown below.
#!/usr/bin/ruby
$str = "Learn To Code in Ruby"
# first method
def First_Method
a = 0
while a <= 5
puts "Thread1: #{a}"
# pause the execution of the current thread
sleep(1)
# incrementing the value of a
a = a + 1
end
puts "Global variable: #$str"
end
# Second method
def Second_Method
b = 0
while b <= 3
puts "Thread2: #{b}"
# pause the execution of the current thread
sleep(0.5)
# incrementing the value of b
b = b + 1
end
puts "Global variable: #$str"
end
x = Thread.new{First_Method()}
y = Thread.new{Second_Method()}
# using Thread.join
x.join
y.join
puts "End"Output
On execution, it will produce the following output
Thread1: 0 Thread2: 0 Thread2: 1 Thread1: 1 Thread2: 2 Thread2: 3 Thread1: 2 Global variable: Learn To Code in Ruby Thread1: 3 Thread1: 4 Thread1: 5 Global variable: Learn To Code in Ruby End
Updated on: 12-Apr-2022
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