From: Joel VanderWerf <vjoel@...>
Date: 2008-09-10T07:08:51+09:00
Subject: Re: FileUtils.chdir thread safety

ara.t.howard wrote:
> 
> On Sep 9, 2008, at 1:46 PM, Joel VanderWerf wrote:
> 
>> So in the case of
>>
>>  Thread.chdir('foo') {puts `ls`}
>>
>> the subprocess would be executed in foo ?
>>
>> This would be very nice, but it seems like a major modification to 
>> ruby... potentially every system call would need to be aware of the 
>> thread cwd state.
> 
> 
> this is already true.  if you do
> 
>   chdir('foo'){ puts `ls` }
> 
> the command will enter foo, run ls, and exit.  the real issue is with

I meant that system calls need to be aware of the current thread's own 
cwd state, as opp. the process cwd.

> 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?

Yeah.

> it seems like an easier

?

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407