initialize_mutex_per_resource

🛠️ Initialize a Mutex for Each Resource

For multiple shared resources, create one Mutex per resource to avoid unnecessary blocking. This lets threads work in parallel when they're accessing different data.

require 'thread'

class BankAccount
  def initialize(balance)
    @balance = balance
    @mutex = Mutex.new
  end

  def deposit(amount)
    @mutex.synchronize do
      @balance += amount
    end
  end

  def balance
    @mutex.synchronize { @balance }
  end
end

account1 = BankAccount.new(100)
account2 = BankAccount.new(200)

# Threads can deposit into different accounts concurrently without blocking each other
a = Thread.new { account1.deposit(50) }
b = Thread.new { account2.deposit(75) }
a.join; b.join
puts account1.balance  # => 150
puts account2.balance  # => 275