How to Control Time Behaviour of System Call ?

[Christoph Neubauer]

Hi Rubyists !

Using Ruby 1.6.8 on Windows.

What I'd like to do is something like:

timeout (n) do
system ("Call some complex C(++) code, that (maybe) does (not)
return to Ruby")
end

As far as I understand, "system" steps out of the Ruby sandbox,
such bypassing the timeout control. If the "Call" remains hanging,
the ruby script will 'never' get back control.

That's no good behaviour for the controller of a regression test.

Any ideas for solution or workaround welcomed !
Chris

 

[Robert Klemme]

Hi Rubyists !

Using Ruby 1.6.8 on Windows.

What I'd like to do is something like:

timeout (n) do
system ("Call some complex C(++) code, that (maybe) does (not)
return to Ruby")
end

As far as I understand, "system" steps out of the Ruby sandbox,
such bypassing the timeout control. If the "Call" remains hanging,
the ruby script will 'never' get back control.

That's no good behaviour for the controller of a regression test.

Any ideas for solution or workaround welcomed !

Use popen in a different thread.

Regards

robert

 

[Ara.T.Howard]

Hi Rubyists !

Using Ruby 1.6.8 on Windows.

What I'd like to do is something like:

timeout (n) do
system ("Call some complex C(++) code, that (maybe) does (not)
return to Ruby")
end

As far as I understand, "system" steps out of the Ruby sandbox,
such bypassing the timeout control. If the "Call" remains hanging,
the ruby script will 'never' get back control.

That's no good behaviour for the controller of a regression test.

Any ideas for solution or workaround welcomed !
Chris

you may be able to use this unmodfified using the windows-process package from

http://raa.ruby-lang.org/search.rhtml?search=win+fork


module ForkTimeout
#{{{
class TimeoutError < StandardError; end
def timeout n, sig = 'SIGUSR1'
#{{{
ret = nil
cid = fork
unless cid
trap('SIGQUIT'){ exit! }
sleep(n)
Process.kill(sig, Process.ppid) rescue nil
exit!
else
begin
handler = trap(sig){ raise(TimeoutError, "timedout <#{ n }>") }
ret = yield
ensure
trap(sig, handler)
Process.kill('SIGQUIT', cid) rescue nil
Process.wait rescue nil
end
end
ret
#}}}
end
module_function 'timeout'
public 'timeout'
#}}}
end

if $0 == __FILE__
ForkTimeout::timeout(0.42){ sleep(0.042) and puts(42) }
ForkTimeout::timeout(0.042){ sleep(0.42) }
end


jib:~ > ruby fork_timeout.rb
42
fork_timeout.rb:15:in `timeout': timedout <0.042> (ForkTimeout::TimeoutError)
from fork_timeout.rb:15:in `call'
from fork_timeout.rb:34:in `sleep'
from fork_timeout.rb:34
from fork_timeout.rb:34:in `timeout'
from fork_timeout.rb:34


let me know if it works for you - i don't have a windows box to test on.

cheers.

-a
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