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    Polling, or interrogation, 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. A good example of hardware implementation is a watchdog … See more

    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 … See more

    A polling cycle is the time in which each element is monitored once. The optimal polling cycle will vary according to several factors, including … See more

    1950s
    The concept of polling is introduced in computer science as a way to communicate with external devices.
    1960s-1970s
    Polling is widely used in multitasking operating systems and networks to allocate resources and access the network.
    1980s-present
    Polling is contrasted with interrupt-driven I/O and other alternatives that can reduce processor usage and/or bandwidth consumption.

    A poll message is a control-acknowledgment message.
    In a multidrop line arrangement (a central computer and different terminals in which the … See more

     
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    What is polling in Computer Science?From the Wikipedia article on Polling 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.
    What is a polling device?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 .
    What is a polling process?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.
    What does it mean if a program polls a device?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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