When ‘mutex_m’ is required, any object that extends or includes Mutex_m will be treated like a Mutex.
Start by requiring the standard library Mutex_m:
From here you can extend an object with Mutex instance methods:
obj = Object.new obj.extend Mutex_m
Or mixin Mutex_m into your module to your class inherit Mutex instance methods — remember to call super() in your class initialize method.
class Foo include Mutex_m def initialize # ... super() end # ... end obj = Foo.new # this obj can be handled like Mutex