From: Abdul-rahman Advany <abdulrahman@...>
Date: 2008-04-30T06:01:50+09:00
Subject: Managing a fork pool to handle tasks

Hey guys,

I am doing some background processes in ruby, and I would like to use
forks. But I can't figure out how I can manage them.

- I want to create a pool of child processes (forks) running in the
background, limited on a number I specify
- Create them from a parent task but creation of new child processes
should be blocked untill one of the child processes in the pool is done
- I want to limit the time a child process can run (so it should quit
after x seconds)

I tried to use Threads but somehow when managing a pool of threads
doesn't work (they get stuck while doing stuff and don't die). I tried
to use the code below but somehow the pool fill's up and I keep waiting
for new threads to become available...

pool = ThreadPool.new(10) # up to 10 threads
pool.process do
  timeout(4) do
    fetch pages, parse stuff, enc...
  end
end
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