license, tests, lib.

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    activesupport (3.2.12)
+      i18n (~> 0.6)
+      multi_json (~> 1.0)
+    bourne (1.1.2)
+      mocha (= 0.10.5)
+    ffi (1.1.0)
+    ffi-libc (0.0.5)
+      ffi (>= 0.6.0, <= 1.1.0)
+    git (1.2.5)
+    i18n (0.6.4)
+    jeweler (1.8.4)
+      bundler (~> 1.0)
+      git (>= 1.2.5)
+      rake
+      rdoc
+    json (1.7.7)
+    metaclass (0.0.1)
+    mocha (0.10.5)
+      metaclass (~> 0.0.1)
+    multi_json (1.6.1)
+    rake (10.0.3)
+    rdoc (4.0.0)
+      json (~> 1.4)
+    shoulda (3.3.2)
+      shoulda-context (~> 1.0.1)
+      shoulda-matchers (~> 1.4.1)
+    shoulda-context (1.0.2)
+    shoulda-matchers (1.4.2)
+      activesupport (>= 3.0.0)
+      bourne (~> 1.1.2)
+    simplecov (0.7.1)
+      multi_json (~> 1.0)
+      simplecov-html (~> 0.7.1)
+    simplecov-html (0.7.1)
+    yard (0.8.5.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bundler
+  ffi-libc
+  jeweler
+  rdoc
+  shoulda
+  simplecov
+  yard

README.md

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+ruby-timeout-interrupt
+======================
+
+Description goes here.
+
+Contributing to ruby-timeout-interrupt
+======================================
+ 
+* Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet.
+* Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it.
+* Fork the project.
+* Start a feature/bugfix branch.
+* Commit and push until you are happy with your contribution.
+* Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
+* Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.
+
+Copyright
+=========
+
+Copyright (c) 2013 Denis Knauf. See LICENSE.txt for
+further details.
+

lib/timeout_interrupt.rb

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+require 'ffi/libc'
+require 'timeout'
+
+module FFI
+	module LibC
+		attach_function :alarm, [:uint], :uint  unless FFI::LibC.respond_to? :alarm
+	end
+end
+
+module TimeoutInterrupt
+	def self.timeouts
+		@timeouts ||= {}
+	end
+
+	def self.alarm_trap sig
+		key, (at, bt) = TimeoutInterrupt.timeouts.min_by {|key,(at,bt)| at }
+		return  if Time.now < at
+		raise Timeout::Error, 'execution expired', bt
+	end
+
+	def self.setup_timeout
+		if TimeoutInterrupt.timeouts.empty?
+			Signal.trap( 'ALRM') {}
+			FFI::LibC.alarm 0
+		else
+			key, (at, bt) = TimeoutInterrupt.timeouts.min_by {|key,(at,bt)| at }
+			secs = (at - Time.now).to_i+1
+			TimeoutInterrupt.alarm_trap  if 1 > secs
+			Signal.trap 'ALRM', &TimeoutInterrupt.method( :alarm_trap)
+			FFI::LibC.alarm secs
+		end
+	end
+
+	def self.timeout seconds
+		seconds = seconds.to_i
+		raise Timeout::Error, "Timeout must be longer than '0' seconds."  unless 0 < seconds
+		return lambda {|&e| self.timeout seconds, &e }  unless block_given?
+		at = Time.now + seconds
+		key, bt = Random.rand( 2**64-1), Kernel.caller
+		begin
+			TimeoutInterrupt.timeouts[key] = [at, bt]
+			TimeoutInterrupt.setup_timeout
+			yield
+		ensure
+			TimeoutInterrupt.timeouts.delete key
+			TimeoutInterrupt.setup_timeout
+		end
+	end
+end