test_timeout.rb: shorten waiting times

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44516 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
timeout.rb: defer creating custom exception

* lib/timeout.rb (Timeout#timeout): when a custom exception is given,
  no instance is needed to be caught, so defer creating new instance
  until it is raised.  [ruby-core:59511] [Bug #9354]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44517 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
timeout.rb: fix for ExitException

* lib/timeout.rb (Timeout#timeout): should not rescue ordinarily
  raised ExitException, which should not be thrown.
* lib/timeout.rb (Timeout::ExitException.catch): set @thread only if
  it ought to be caught.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44518 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
timeout.rb: unused attribute

* lib/timeout.rb (Timeout::ExitException): remove unused attribute,
  klass.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44519 b2dd03c8-39d4-4d8f-98ff-823fe69b080e