[one-users] why does scheduler need to order the actions pending in scheduler queue?

[cmcc.dylan]

    Hi everyone!
    I read source codes of  opennebula-3.8.3  and find that scheduler has to order the scheduler quque in every TIMER_ACTION by do_scheduled_actions function. I have a doubt  why scheduler should order them because  the actions added in scheduler quque are already FIFO.
    which scenarios can break the FIFO rule?
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