From: Charles Oliver Nutter <charles.nutter@...>
Date: 2008-09-10T11:09:40+09:00
Subject: Re: FileUtils.chdir thread safety

ara.t.howard wrote:
> a thread local 'chdir' would need to affect backticks, system, exec, Dir 
> methods, FileUtils methods, etc.  i guess the first thing scheduling 
> each thread would need to do is chdir to it's own cwd before running any 
> code to be safe.  this seems *very* expensive doesn't it?

JRuby already supports multiple cwd in the same process by doing exactly 
that, making all filesystem-aware operations use *our* cwd rather than 
the process cwd. This is, for example, how you can run multiple Rails 
apps in the same process, concurrently, without them stepping on each 
other; they each get their own virtual cwd.

We could ignore implementation details for the moment, couldn't we? It 
would be nice to have.

- Charlie