I think most of time delta is larger than zero, and i guess that the intention of the if statement for checking delta is non-zero is for ignoring some extreme case that the ngx_process_events handler returns so quickly that the millisecond precision is not enough to display the calling time(less than 1ms maybe). In this case, calling the ngx_event_expire_timers is unnecessary. Also , even in an extreme case that delta is zero for current cycle and events are posted to queue, calling for the ngx_event_expire_timers will be executed next cycle, presumably.
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