Question: In what circumstances would the enqueuer fail?

[Alan Huang <mmpgouride@xxxxxxxxx>]

Hi,

I’m reading 14.2.1.3 Half-NBS Queue, there is one sentence says:

	The enqueuer might have failed between lines 9 and 10 of the listing, so that the element in question is only partially enqueued.

My question is: In what circumstances would the enqueuer fail between lines 9 and 10 ?

Thanks,
Alan