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What are poll retrive new event loop node js?

What are poll retrive new event loop node js?


Asked On2019-10-23 03:05:41 by:arunwebber

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  • poll: retrieve new I/O events; execute I/O related callbacks (almost all with the exception of close callbacks, the ones scheduled by timers, and setImmediate()); node will block here when appropriate.

The poll phase has two main functions:

  1. Calculating how long it should block and poll for I/O, then
  2. Processing events in the poll queue.

When the event loop enters the poll phase and there are no timers scheduled, one of two things will happen:

  • If the poll queue is not empty, the event loop will iterate through its queue of callbacks executing them synchronously until either the queue has been exhausted, or the system-dependent hard limit is reached.

  • If the poll queue is empty, one of two more things will happen:

    • If scripts have been scheduled by setImmediate(), the event loop will end the poll phase and continue to the check phase to execute those scheduled scripts.

    • If scripts have not been scheduled by setImmediate(), the event loop will wait for callbacks to be added to the queue, then execute them immediately.

Once the poll queue is empty the event loop will check for timers whose time thresholds have been reached. If one or more timers are ready, the event loop will wrap back to the timers phase to execute those timers' callbacks.





Answerd on:2021-03-22 Answerd By:arunwebber

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