From: Gary Wright <gwtmp01@...>
Date: 2007-04-06T04:03:01+09:00
Subject: Re: Forking and copying variables


On Apr 5, 2007, at 4:20 AM, Robert Klemme wrote:

> On 05.04.2007 06:03, Brandon Casci wrote:
>> I have a script that sets a few variables and then forks. Each fork
>> executes the script from top to bottom. Is there any way for the  
>> forks
>> to get a copy of all the variables set before the fork, because each
>> fork thinks it;s running for the first time (and ya I see why  
>> because a
>> fork is a copy of the current process)?
>> Maybe forking isn't what I'm looking for, but the performance is  
>> so much
>> better than threading for this task.
>
> Use the block form of fork, that will preserve all state:

I don't think the state preserving semantics are different for block or
non-block forms:

$ cat fork.rb
foo = 1

if child = Process.fork
   puts "parent says: child is pid #{child}, foo is #{foo}"
else
   puts "child says: my pid is #{$$}, foo is #{foo}"
end

$ ruby fork.rb
child says: my pid is 7875, foo is 1
parent says: child is pid 7875, foo is 1



Gary Wright