Unix Signals are an instance of

Question

BlackTom AI · Accepted Answer

When evaluating which software design pattern Unix Signals resemble, we should compare how the mechanism distributes notifications to interested parties.
Option 1: Composite Pattern. This pattern models part-whole hierarchies and allows treating individual objects and compositions uniformly; it governs structure, not notification semantics, so it does not fit signal delivery semantics.
Option 2: Singleton Pattern. This ensures only one instance of a class exists and provides a global point of access; it is about instance control, not how events or signals are broadcast to listeners, so it’s not a match for signaling.
Option 3: State Pattern. This pattern allows an object to alter its behavior when its internal state changes, effectively changing its class-like behavior at runtime; while state changes can influence processing, it does not describe the mechanism of notifying interested parties about events, so it’s not the best fit for signals.
Option 4: Observer Pattern. This pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. Unix Signals embody this idea: a signal is an event that is sent to interested handlers (observers), triggering callbacks in response to that event.
Thus, the reasoning pointing to the Observer Pattern highlights the core idea of event notification to multiple listeners, which aligns with how signals are delivered and handled in Unix environments.

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