From: Pit Capitain <pit@...>
Date: 2007-02-08T23:18:57+09:00
Subject: Re: Threads and external methods

Hi wd!

> If I have require'd a module ...

BTW: in Ruby you require a file, which might contain a module definition.

> ...and call a method within that module from
> within a thread, do all the variables within that external module need
> to be made thread safe?

In this context, it doesn't matter whether the code you execute comes 
from an "external" module or not.

> test.rb ==>
> require 'mod'
> threads = []
> (1..20).each do
> threads << Thread.new( var ) { |var|
>    # call a function/method within mod
>    modFunction( var )
> }
> threads.each {|a| a.join}

Where does the variable "var" which you pass to Thread.new come from? 
What value does it have? Are you deliberately using the name "var" as 
the name of both a local variable and a block parameter?

> mod.rb ==>
> def modFunction( myvar )
>    # do lotsa copmlex stuff with myvar
>    ....
> end
> 
> ===
> 
> Does the 'myvar' variable above need to be 'Thread.current[ "myvar" ]'
> instead?

I don't think so. Maybe you can show us a short working example of your 
code and tell us what didn't work as you expected.

Regards,
Pit