In which data types are methods that manage the execution context implemented?

In Go, methods that manage the execution context (for example, methods of the context.Context interface) are implemented in types that encapsulate the state and lifecycle management of an operation. Usually, these are structures that contain information about deadlines, cancellations, and values.

For example, the standard context package provides types such as cancelCtx, timerCtx, which implement the Context interface:

// Context interface
type Context interface {
    Deadline() (deadline time.Time, ok bool)
    Done() <-chan struct{}
    Err() error
    Value(key interface{}) interface{}
}

These methods are implemented in specific struct types that manage the context's state, such as cancellation signals or timeouts. Therefore, context management methods are implemented in user-defined or standard structures that conform to the Context interface.