From: Karan Rajput <ganeshgirase@...>
Date: 2011-01-13T19:59:18+09:00
Subject: Thread Variable race condition

Hi,


I am not enough efficient in Threads.
Here is the problem.


i = 1
while(i < 100)

   t = Thread.new do
      echo(i)
   end
   t.join if (i % 5 == 0)
   i = i + 1
end

def echo(num)
puts num
end

I get output sometimes as,

1
2
3
5
5 ==> 5 is getting duplicated whereas 4 is dropped. I feel its race
condition for variable.
6.... and so on.

This error occurred for any random number.

Sometime i get the correct output.

Can anybody suggest what will be solution to avoid any such problem.
Will replacement of Thread with Process will solve problem?
I am hoping solution in Threads only if its possible.


Thanks in Advance.

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