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comp.lang.ruby

Threading in ruby is retarded .....?~!

Sal Syed

9/1/2007 7:00:00 PM

I'm running the latest version an Ruby and the way threads work makes
absolutely no sense to me...

I have the simplest use of threads:
[code]
Thread.new do
while true
puts "Enter command"
if gets.chomp=='exit'
break;

end
puts 'Ended service'
end

Thread.new do
while service != nil
server.start
end end

$user[:drbserver]=DistributedSearch.new($user,$database)
service=DRb.start_service("druby://localhost:#{$config[:drbport]}",$user[:drbserver])
DRb.thread.join
[/code]

When I run this DRb does NOT start until after I type in exit! Why does
a new thread block the main thread wtf?????? I'm guessing this is not
normal and has something to do with either DRb or Webrick. Isn't there a
way that these two would just run their own threads...? It makes it
useless to me if I can't run both in the same program
--
Posted via http://www.ruby-....
4 Answers

Joel VanderWerf

9/1/2007 9:40:00 PM

0

Sal Syed wrote:
> I'm running the latest version an Ruby and the way threads work makes
> absolutely no sense to me...
>
> I have the simplest use of threads:
> [code]
> Thread.new do
> while true
> puts "Enter command"
> if gets.chomp=='exit'

Are you using windows? This is a known problem:

http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/ceec6a04e90ae4ba?tvc=2&q=gets+blocks+process+windows...

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

Charles Oliver Nutter

9/1/2007 10:45:00 PM

0

Sal Syed wrote:
> I'm running the latest version an Ruby and the way threads work makes
> absolutely no sense to me...
...
> When I run this DRb does NOT start until after I type in exit! Why does
> a new thread block the main thread wtf?????? I'm guessing this is not
> normal and has something to do with either DRb or Webrick. Isn't there a
> way that these two would just run their own threads...? It makes it
> useless to me if I can't run both in the same program

You could try it in JRuby, which uses normal operating system threads.
No thread should be prevented from running unless you explicitly make it
happen.

- Charlie

Eric Hodel

9/9/2007 7:08:00 PM

0

On Sep 1, 2007, at 12:00, Sal Syed wrote:

> I'm running the latest version an Ruby and the way threads work makes
> absolutely no sense to me...
>
> I have the simplest use of threads:
> [code]
> Thread.new do
> while true
> puts "Enter command"
> if gets.chomp=='exit'
> break;
>
> end
> puts 'Ended service'
> end
>
> Thread.new do
> while service != nil
> server.start
> end end
>
> $user[:drbserver]=DistributedSearch.new($user,$database)
> service=DRb.start_service("druby://localhost:#{$config[:drbport]}",
> $user[:drbserver])
> DRb.thread.join
> [/code]
>
> When I run this DRb does NOT start until after I type in exit! Why
> does
> a new thread block the main thread wtf?????? I'm guessing this is not
> normal and has something to do with either DRb or Webrick. Isn't
> there a
> way that these two would just run their own threads...? It makes it
> useless to me if I can't run both in the same program

Are you using windows? It is broken, not ruby. Don't use gets in
the main thread.

--
Poor workers blame their tools. Good workers build better tools. The
best workers get their tools to do the work for them. -- Syndicate Wars

ara.t.howard

9/9/2007 7:22:00 PM

0


On Sep 1, 2007, at 1:00 PM, Sal Syed wrote:

> I'm running the latest version an Ruby and the way threads work makes
> absolutely no sense to me...
>
> I have the simplest use of threads:
> [code]
> Thread.new do
> while true
> puts "Enter command"
> if gets.chomp=='exit'
> break;
>
> end
> puts 'Ended service'
> end
>
> Thread.new do
> while service != nil
> server.start
> end end
>
> $user[:drbserver]=DistributedSearch.new($user,$database)
> service=DRb.start_service("druby://localhost:#{$config[:drbport]}",
> $user[:drbserver])
> DRb.thread.join
> [/code]
>


this code won't run at all. post a complete, but minimal, example
and someone might be inclined to fix it for you. as it stands i have
no idea wtf????????? service or wft???????? server are.

the code above has at least one race condition in it as it stands:
you race here

while service != nil

and

service = ...

in some cases service will be nice the first time, in others not.
perhaps this intended but, again, it's hard to see without a
meaningful code posting.

you'll have to help use help you if you want to get complete answer.

regards.

a @ http://draw...
--
we can deny everything, except that we have the possibility of being
better. simply reflect on that.
h.h. the 14th dalai lama