module IO::Event
module IO::Event::Debug
module IO::Event::Selector
module IO::Event::Support
class IO
class IO::Event::Debug::Selector
class IO::Event::Interrupt
class IO::Event::PriorityHeap
class IO::Event::Selector::Select
class IO::Event::Timers
class IO::Event::Timers::Handle
io-event
1.6.2
# cancelled?
def cancelled? @block.nil? end