https://stackoverflow.com/questions/10594426/what-is-the-difference-between-busy-wait-and-polling
위에 출처
The difference between the two is what the application does between polls.
If a program polls a device say every second, and does something else in the mean time if no data is available (including possibly just sleeping, leaving the CPU available for others), it's polling.
If the program continuously polls the device (or resource or whatever) without doing anything in between checks, it's called a busy-wait.
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