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In the C Standard Library, signal processing defines how a program handles various signals while it executes. A signal can report some exceptional behavior within the program (such as division by zero), or a signal can report some asynchronous event outside the program (such as someone striking an interactive attention key on a keyboard).
The example below shows a binary rational function equivalent to the above example, with an additional transition (nil, radio) to set the system into its initial state. Here the input symbols nil, mode, next denote events that drive a transducer with output effectors cd, nextTrack, radio, nextStation. Expressions like this are generally much ...
The third topology, introduced by A.M. Kirch, [3] is an example of a countably infinite Hausdorff space that is both connected and locally connected. These topologies also have interesting separation and homogeneity properties. The notion of an arithmetic progression topology can be generalized to arbitrary Dedekind domains.
Keyboard events. HTML frame/object events. HTML form events. User interface events. Mutation events (notification of any changes to the structure of a document). Progress events [5] (used by XMLHttpRequest and File API [6]). Note that the event classification above is not exactly the same as W3C's classification.
The actual logic is contained in event-handler routines. These routines handle the events to which the main program will respond. For example, a single left-button mouse-click on a command button in a GUI program may trigger a routine that will open another window, save data to a database or exit the application.
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Event propagation models, such as bubbling, capturing, and pub/sub, define how events are distributed and handled within a system. Other key aspects include event loops, event queueing and prioritization, event sourcing, and complex event processing patterns. These mechanisms contribute to the flexibility and scalability of event-driven systems.
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