Background returns an empty context using the default logger.

WithValue returns a copy of parent in which the value associated with key is val.

NoopSleeper is a noop implementation of ChannelSleeper and Context.UninterruptibleSleep* methods for anonymous embedding in other types that do not implement special behavior around sleeps.

A ChannelSleeper represents a goroutine that may sleep interruptibly, where interruption is indicated by a channel becoming readable.

A Context represents a thread of execution (hereafter "goroutine" to reflect Go idiosyncrasy).