Extended maintenance of Ruby 1.9.3 ended on February 23, 2015. Read more
Timeout long-running blocks
require 'timeout' status = Timeout::timeout(5) { # Something that should be interrupted if it takes more than 5 seconds... }
Timeout provides a way to auto-terminate a potentially long-running operation if it hasn't finished in a fixed amount of time.
Previous versions didn’t use a module for namespacing, however timeout is provided for backwards compatibility. You should prefer Timeout#timeout instead.
(C) 2000 Network Applied Communication Laboratory, Inc.
(C) 2000 Information-technology Promotion Agency, Japan
Perform an operation in a block, raising an error if it takes longer than
sec
seconds to complete.
sec
Number of seconds to wait for the block to terminate. Any number may be
used, including Floats to specify fractional seconds. A value of 0 or
nil
will execute the block without any timeout.
klass
Exception Class to raise if the block fails to terminate in
sec
seconds. Omitting will use the default, Timeout::Error
The block will be executed on another thread and will be given one
argument: sec
.
Returns the result of the block if the block completed
before sec
seconds, otherwise throws an exception, based on
the value of klass
.
Note that this is both a method of module Timeout, so you can include Timeout
into your classes so they have a timeout method, as well as a module
method, so you can call it directly as ::timeout.
# File timeout.rb, line 54 def timeout(sec, klass = nil) #:yield: +sec+ return yield(sec) if sec == nil or sec.zero? exception = klass || Class.new(ExitException) begin begin x = Thread.current y = Thread.start { begin sleep sec rescue => e x.raise e else x.raise exception, "execution expired" end } return yield(sec) ensure if y y.kill y.join # make sure y is dead. end end rescue exception => e rej = /\A#{Regexp.quote(__FILE__)}:#{__LINE__-4}\z/o (bt = e.backtrace).reject! {|m| rej =~ m} level = -caller(CALLER_OFFSET).size while THIS_FILE =~ bt[level] bt.delete_at(level) level += 1 end raise if klass # if exception class is specified, it # would be expected outside. raise Error, e.message, e.backtrace end end
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