This is easy using monitors. : Synchronization « Threads « Ruby

1. Ruby
2. Threads
3. Synchronization

This is easy using monitors.

require 'monitor' 

class Counter < Monitor 
    attr_reader :count 

    def initialize 
        @count = 0 
        super 
    end 

    def tick 
        synchronize do 
        @count += 1 
    end 
    end 
end 
c = Counter.new 
t1 = Thread.new { 10000.times { c.tick } } 
t2 = Thread.new { 10000.times { c.tick } } 


t1.join; t2.join 
c.count # 20000 

 

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