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- Polling_(computer_science) abstract "Polling, or polled operation, in computer science, refers to actively sampling the status of an external device by a client program as a synchronous activity. Polling is most often used in terms of input/output (I/O), and is also referred to as polled I/O or software-driven I/O.Polling is sometimes used synonymously with busy-wait polling (busy waiting). In this situation, when an I/O operation is required, the computer does nothing other than check the status of the I/O device until it is ready, at which point the device is accessed. In other words, the computer waits until the device is ready. Polling also refers to the situation where a device is repeatedly checked for readiness, and if it is not, the computer returns to a different task. Although not as wasteful of CPU cycles as busy waiting, this is generally not as efficient as the alternative to polling, interrupt-driven I/O.In a simple single-purpose system, even busy-wait is perfectly appropriate if no action is possible until the I/O access, but more often than not this was traditionally a consequence of simple hardware or non-multitasking operating systems.Polling is often intimately involved with very low-level hardware. For example, polling a parallel printer port to check whether it is ready for another character involves examining as little as one bit of a byte. That bit represents, at the time of reading, whether a single wire in the printer cable is at low or high voltage. The I/O instruction that reads this byte directly transfers the voltage state of eight real world wires to the eight circuits (flip flops) that make up one byte of a CPU register.Polling has the disadvantage that if there are too many devices to check, the time required to poll them can exceed the time available to service the I/O device.Polling can be described in following steps:The host repeatedly reads the busy bit of the controller until it becomes clear.When clear, the host writes in the command register and writes a byte into the data-out register.The host sets the command-ready bit (set to 1).When the controller senses command-ready bit is set, it sets busy bit.The controller reads the command register and since write bit is set, it performs necessary I/O operations on the device. If the read bit is set to one instead of write bit, data from device is loaded into data-in register, which is further read by the host.The controller clears the command-ready bit once everything is over, it clears error bit to show successful operation and reset busy bit (0).".
- Polling_(computer_science) wikiPageID "4516638".
- Polling_(computer_science) wikiPageRevisionID "603445769".
- Polling_(computer_science) auto "yes".
- Polling_(computer_science) date "December 2009".
- Polling_(computer_science) hasPhotoCollection Polling_(computer_science).
- Polling_(computer_science) subject Category:Events_(computing).
- Polling_(computer_science) subject output.
- Polling_(computer_science) comment "Polling, or polled operation, in computer science, refers to actively sampling the status of an external device by a client program as a synchronous activity. Polling is most often used in terms of input/output (I/O), and is also referred to as polled I/O or software-driven I/O.Polling is sometimes used synonymously with busy-wait polling (busy waiting).".
- Polling_(computer_science) label "Polling (Informatik)".
- Polling_(computer_science) label "Polling (computer science)".
- Polling_(computer_science) label "Polling (informatica)".
- Polling_(computer_science) label "Polling (techniek)".
- Polling_(computer_science) label "Polling".
- Polling_(computer_science) label "ポーリング (情報)".
- Polling_(computer_science) sameAs Polling_(Informatik).
- Polling_(computer_science) sameAs Polling.
- Polling_(computer_science) sameAs Polling.
- Polling_(computer_science) sameAs Polling_(informatica).
- Polling_(computer_science) sameAs ポーリング_(情報).
- Polling_(computer_science) sameAs 폴링_(컴퓨터_과학).
- Polling_(computer_science) sameAs Polling_(techniek).
- Polling_(computer_science) sameAs m.0c6p9v.
- Polling_(computer_science) sameAs Q1362921.
- Polling_(computer_science) sameAs Q1362921.
- Polling_(computer_science) wasDerivedFrom Polling_(computer_science)?oldid=603445769.
- Polling_(computer_science) isPrimaryTopicOf Polling_(computer_science).