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unless Queue.method_defined? :close
require 'backports/tools/alias_method_chain'
class ClosedQueueError < StopIteration
end
class Queue
CLOSE_MESSAGE = Object.new
def push_with_close(arg)
raise ClosedQueueError, 'queue closed' if closed?
push_without_close(arg)
end
Backports.alias_method_chain self, :push, :close
alias_method :<<, :push
alias_method :enq, :push
def pop_with_close(non_block = false)
begin
r = pop_without_close(non_block || closed?)
r unless CLOSE_MESSAGE == r
rescue ThreadError
raise if non_block || !closed?
end
end
Backports.alias_method_chain self, :pop, :close
alias_method :shift, :pop
alias_method :deq, :pop
def close
@closed = true
2.times do
Thread.pass
num_waiting.times do
push_without_close CLOSE_MESSAGE
end
end
self
end
def closed?
!!defined?(@closed)
end
end
end
|
