From: Abhijit Sarkar <lists@...>
Date: 2013-02-14T21:32:44+09:00
Subject: Re: Ruby Multithreaded producer-consumer problem

Carlo E. Prelz wrote in post #1096828:

> Instance variables are only accessible from within methods. Lines
> 83-86 are not within a method. Take lines 83-86 out of the class
> definition, and change them to something like:
>
> worker=Worker.new(Mutex.new,ConditionVariable.new,OrangeTree.new)
> worker.do_some_work
> until(worker.orange_tree.age==OrangeTree::AGE_TO_DIE)
>   # wait for the Threads to finish
> end
>
> Of course, variable orange_tree has to be visible from the outside, so
> you have to add something like
>
> attr_reader(:orange_tree)
>
> at the beginning of the Worker class. This way you should not have
> those exceptions anymore.

After making the changes you suggested and adding joins inside class
Worker, (file attached) I am now getting:

Orange picker going to sleep for 5
Orange picker woke up after sleeping for 5
Sorry, no Oranges to pick
Orange picker waiting patiently...
Age increaser going to sleep for 2
Age increaser woke up after sleeping for 2
/Users/Abhijit/Workspace/eclipse/ruby/learn_to_program/orange_tree.rb:76:in
`join': deadlock detected (fatal)
  from
/Users/Abhijit/Workspace/eclipse/ruby/learn_to_program/orange_tree.rb:76:in
`do_some_work'
  from
/Users/Abhijit/Workspace/eclipse/ruby/learn_to_program/orange_tree.rb:82:in
`<class:Worker>'
  from
/Users/Abhijit/Workspace/eclipse/ruby/learn_to_program/orange_tree.rb:39:in
`<main>'

Attachments:
http://www.ruby-forum.com/attachment/8128/orange_tree.rb


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