From: Glen Holcomb <damnbigman@...>
Date: 2008-12-05T23:24:43+09:00
Subject: Re: Force a program to stop if runtime exceeds given duration

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On Fri, Dec 5, 2008 at 7:25 AM, Glen Holcomb <damnbigman@gmail.com> wrote:

> On Fri, Dec 5, 2008 at 7:08 AM, Glen Holcomb <damnbigman@gmail.com> wrote:
>
>> On Fri, Dec 5, 2008 at 6:59 AM, Aldric Giacomoni <"aldric[remove]"@
>> trevoke.net> wrote:
>>
>> > Everybody automatically assumes that rubyists are using Linux - sadly,
>> in
>> > the medical field Linux is not an option unless you're working with the
>> > modality itself. Medical software is almost all Windows-based.. So,
>> Windows
>> > is where I am for this issue and Windows is where I remain :(
>> > If it were for an outside-Ruby solution, I can think of tons of options.
>> I
>> > just want a program which works and does everything all by itself..
>> Because
>> > if I have to deploy this to 400 machines, I don't wanna have to do any
>> more
>> > setup work than absolutely required.
>> >
>> >
>> > Ron Fox wrote:
>> >
>> >> See http://www.ruby-doc.org/core-1.9/classes/Process.html#M003012
>> >>
>> >> It and sleep have all the tools you need to do this. The idea is that
>> you
>> >> have a master process that forks the child process which runs the
>> script you
>> >> want to time.  The master process then loops. The loop
>> >> sleeps a bit then calls waitpid with the WNOHANG flag to see if the
>> child
>> >> has exited.  Count the sleep time, or use Time to figure out how long
>> you've
>> >> been waiting.. Once you've waited long enough, use kill
>> >> to kill the child process.  If the child has exited.. the master
>> process
>> >> exits.
>> >>
>> >> The length of your sleep in the loop of the master process determines
>> >> - The precision with which you measure the timeout.
>> >> - The latency with which the master process responds to normal child
>> exit.
>> >>
>> >> Ron.
>> >>
>> >> Aldric Giacomoni wrote:
>> >>
>> >>> Any idea how to do that?
>> >>> Say, I don't want a program to run longer than 5 hours.. How would
>> that
>> >>> be implemented?
>> >>>
>> >>> --Aldric
>> >>>
>> >>
>> >>
>> >>
>> >
>> I'm in the same boat here at work.  Fork won't work in Windows so that
>> option is out.  However if the thread or timeout suggestions don't work
>> for
>> you it might be possible to adjust Robert's suggestion to run as a Windows
>> Task.  I don't know if you can put a time limit on a task though (don't
>> use
>> them very often).
>>
>> --
>> "Hey brother Christian with your high and mighty errand, Your actions
>> speak
>> so loud, I can't hear a word you're saying."
>>
>> -Greg Graffin (Bad Religion)
>>
>
> Another option (to expand on my second suggestion) would be to compile the
> potentially long running script into an exe using rubyscript2exe and then
> launch it from another script system("start script.exe") then after five
> hours wake up and check the windows process list for script.exe and if it is
> running kill it:
>
> wmi =
> WIN32OLE.connect("winmgmts:{impersonationLevel=impersonate,(Shutdown)}\\\\#{name}\\root\\cimv2")
> proc_list = wmi.ExecQuery("select * from win32_process")
> proc_list.each do |process|
>   if process.Name == "script.exe"
>     process.Terminate(8)
>   end
> end
>
> http://msdn.microsoft.com/en-us/library/aa394372(VS.85).aspx<http://msdn.microsoft.com/en-us/library/aa394372%28VS.85%29.aspx>
>
> You would of course need to require 'win32ole' for this to work.
>
>
> --
> "Hey brother Christian with your high and mighty errand, Your actions speak
> so loud, I can't hear a word you're saying."
>
> -Greg Graffin (Bad Religion)
>

Sorry copied that from another program of mine without looking at it too
closely.  You don't need to impersonate on the WIN32OLE.connect and #{name}
should be the machine hostname so something like this should work:

require 'socket'
require 'win32ole'

wmi = WIN32OLE.connect("winmgmts:\\\\#{Socket.hostname}\\root\\cimv2")
proc_list = wmi.ExecQuery("select * from win32_process")
proc_list.each do |process|
  if process.Name == "script.exe"
    process.Terminate(8)
  end
end

-- 
"Hey brother Christian with your high and mighty errand, Your actions speak
so loud, I can't hear a word you're saying."

-Greg Graffin (Bad Religion)

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