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describe :sizedqueue_enq, shared: true do
it "blocks if queued elements exceed size" do
q = @object.call(1)
q.size.should == 0
q.send(@method, :first_element)
q.size.should == 1
blocked_thread = Thread.new { q.send(@method, :second_element) }
sleep 0.01 until blocked_thread.stop?
q.size.should == 1
q.pop.should == :first_element
blocked_thread.join
q.size.should == 1
q.pop.should == :second_element
q.size.should == 0
end
it "raises a ThreadError if queued elements exceed size when not blocking" do
q = @object.call(2)
non_blocking = true
add_to_queue = -> { q.send(@method, Object.new, non_blocking) }
q.size.should == 0
add_to_queue.call
q.size.should == 1
add_to_queue.call
q.size.should == 2
add_to_queue.should raise_error(ThreadError)
end
it "interrupts enqueuing threads with ClosedQueueError when the queue is closed" do
q = @object.call(1)
q << 1
t = Thread.new {
-> { q.send(@method, 2) }.should raise_error(ClosedQueueError)
}
Thread.pass until q.num_waiting == 1
q.close
t.join
q.pop.should == 1
end
end
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