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Timeout (computing) : ウィキペディア英語版
Timeout (computing)

In telecommunication and related engineering (including computer networking and programming), the term timeout or time-out has several meanings, including:
* A network parameter related to an enforced event designed to occur at the conclusion of a predetermined elapsed time.
* A specified period of time that will be allowed to elapse in a system before a specified event is to take place, unless another specified event occurs first; in either case, the period is terminated when either event takes place. Note: A timeout condition can be canceled by the receipt of an appropriate time-out cancellation signal.
* An event that occurs at the end of a predetermined period of time that began at the occurrence of another specified event. The timeout can be prevented by an appropriate signal.
Timeout allows a more efficient usage of limited resources without requiring additional interaction from the agent interested in the goods that cause the consumption of these resources. The basic idea is that in situations where a system must wait for something to happen, rather than waiting indefinitely, the waiting will be aborted after the timeout period has elapsed. This is based on the assumption that further waiting is useless, and some other action is necessary.
Other examples are
* In POP connections, the server will usually close a client connection after a certain period of inactivity (the timeout period). This ensures that connections do not persist forever, if the client crashes or the network goes down. Open connections consume resources, and may prevent other clients from accessing the same mailbox.
* In HTTP persistent connections, the web server saves opened connections (which consume CPU time and memory). The web client does not have to send an "end of requests series" signal. Connections are closed (timed out) after 5 minutes of inactivity; this ensures that the connections do not persist indefinitely.
* In a timed light switch, both energy and lamp's life-span are saved. The user does not have to switch off manually.
* Tablet computers and smartphones commonly turn off their backlight after a certain time without user input.
* In an electronic text-based customer relationship management software tool, the threads can be auto-closed in a timed base, allowing the workers save browse time. The customer does not have to send an "I'm done" signal.
== See also ==

* Fibre Channel time out values
* Human-Machine Interaction
* Permanent signal

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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