From: Ye Dingding <yedingding@...>
Date: 2007-08-13T23:05:56+09:00
Subject: Re: Timeout::Error - catchable?

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You should handle the exception clearly, that is, rescue TimeoutError.

The default action of rescue is to catch the exception which is a subclass
of StandardError, but unfortunately, TimeoutError is not.

On 8/13/07, Rik Hemsley <rikkus@gmail.com> wrote:
>
> Hi,
>
> I'm having trouble catching the exception raised by Timeout.timeout
>
> Using the following code:
>
> require 'timeout'
> begin
>   Timeout::timeout(1) do
>     sleep(5)
>   end
> rescue
>   puts "rescued in outer"
> end
>
> The interpreter stops with the following:
>
> /usr/lib/ruby/1.8/timeout.rb:54: execution expired (Timeout::Error)
>         from /usr/lib/ruby/1.8/timeout.rb:56:in `timeout'
>         from test.rb:21
>
> I can't catch the exception from within the block, either:
>
> require 'timeout'
> Timeout::timeout(1) do
>   begin
>     sleep(5)
>   rescue
>     puts "rescued in inner"
>   end
> end
>
> This gives the same error:
>
> /usr/lib/ruby/1.8/timeout.rb:54: execution expired (Timeout::Error)
>         from /usr/lib/ruby/1.8/timeout.rb:56:in `timeout'
>         from test2.rb:8
>
> Is this a known problem, or am I using Timeout incorrectly?
>
> I am using a workaround for now -- my own implementation:
>
> module TimeLimit
>
>   class Expired < RuntimeError; end
>
>   def self.timeout(sec, &block)
>     worker = Thread.new(&block)
>     killer = Thread.new { sleep sec; worker.raise Expired.new if
> worker.alive? }
>     worker.join
>     killer.kill if killer.alive?
>   end
>
> end
>
> With the above code, the following prints 'expired' followed by
> 'finished', as I would expect:
>
> TimeLimit::timeout(1) do
>   begin
>     sleep 5
>     puts "finished"
>   rescue TimeLimit::Expired
>     puts "expired"
>   end
> end
>
> TimeLimit::timeout(5) do
>   begin
>     sleep 1
>     puts "finished"
>   rescue TimeLimit::Expired
>     puts "expired"
>   end
> end
>
> Cheers,
> Rik
>
>
>

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