Polling (computer science) - Wikipedia
https://en.wikipedia.org/wiki/Polling_(computer_science)
Polling is the process where the computer or controlling device waits for an external device to check for its readiness or state, often with low-level hardware. For example, when a printer is connected via a parallel port, the computer waits until the printer has received the next character. These processes can be as minute as only reading one bit. This is sometimes used synonymously with 'busy-wait' polling. In this situation, when an I/O operation is required, the computer does n…
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