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I don't quite understand an answer from the other site:

But if the time expires until the process releases the spinlock, the process is moved to the waiting state, allowing ...

So is that the time expiration happen after the process releases something? Or is that the time expiration happen at the time the process releases something? (Or the others)

OK, I just watch a video on YouTube says A until B means A will stop when B happen, which make me more confused. That the if the time expires is not a period of time, it's an instant, right? how can this "instant event" keep happening until something happen? LoL

So how should I interpret the sentence?

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    The use of until is wrong. I suspect that if you replace it with before, the sentence will have the intended meaning. But I can't know for sure what the author intended to say. – Jason Bassford Dec 26 '18 at 4:47
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Your example could also be read as (assuming the sentence is broken up badly)

1) If the time expires
2) until the process releases the spinlock (and the process has not released the spinlock)
3) the process is moved to a waiting state (until the spinlock is released)

  • Oh, I understand it, it's three steps. – user7813604 Dec 26 '18 at 9:26
  • Thank you so so much! This makes perfect sense now! – user7813604 Dec 26 '18 at 9:28

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