From: mathew murphy <meta@...>
Date: 2011-12-08T13:37:25+09:00
Subject: [ruby-core:41540] [ruby-trunk - Bug #4681] Timeout.timeout doesn't actually time out?


Issue #4681 has been updated by mathew murphy.


Just noting for the benefit of anyone else passing by that I posted a way to do popen3 with timeout at
https://gist.github.com/1032297
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Bug #4681: Timeout.timeout doesn't actually time out?
http://redmine.ruby-lang.org/issues/4681

Author: mathew murphy
Status: Rejected
Priority: Normal
Assignee: Akira Tanaka
Category: 
Target version: 1.9.3
ruby -v: 1.9.2p180


Documentation for Timeout says "A way of performing a potentially long-running operation in a thread, and terminating its execution if it hasn���t finished by a fixed amount of time."

This doesn't actually seem to be what it does.

Example code:

#!/usr/bin/ruby                                                                 
# encoding: UTF-8                                                               
                                                                                
require 'open3'                                                                 
require 'timeout'                                                               
                                                                                
puts "Time out after 2 seconds. Count them..."                                  
result = Timeout.timeout(2) do                                                  
  stdin, stdout, stderr = Open3.capture3("sleep 30")                            
  output = stdout.read + "\n" + stderr.read                                     
end                                                                             

On my systems, this doesn't time out after 2 seconds. Instead, it runs for 30 seconds, and then throws an error saying it took longer than 2 seconds.


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