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danlynn/threadsafe.rb

Created March 4, 2016 20:34
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threadsafe.rb
# imagine this code ran in parallel by 2 threads in the same proc
@@credit = params[:credit]
thread.sleep(1) # lots of work going on here giving other thread chance to set balance from its request
account.balance += @@credit # reading value that might have been set by either thread last
account.save
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