From: James Coglan <jcoglan@...>
Date: 2009-09-21T02:50:30+09:00
Subject: Thread-safe FileUtils.cd

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Hi all,

I have a build tool that I've written in Ruby that uses this construct to
enter a directory, perform some long-running (several seconds) tasks then
exit back to the original working directory:

FileUtils.cd(dir) do
  # expensive operations
end

Now I'm trying to write another tool that uses this build library to run
several builds at once in different Threads. Problem is, the FileUtils.cd
commands overlap and conflict with each other, causing the builds to fail. I
have a lot of code already out in production that relies on this directory
being set correctly (users can write hooks into the build system, and these
hooks assume a certain working directory), so I can't remove the cd() call.

My question is, is there a way of setting the working directory on a
per-thread basis, or is it a global property of the Ruby process that cannot
be made thread-safe?

Cheers,
James

-- 
James Coglan
http://jcoglan.com

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