go-concurrency-context-background

what’s context.Background()

tags: learning go programming

content

• Background is the root of all contexts
• context.Background() returns an empty context

WithCancel and WithTimeout

• these two functions copies parent context (input arg)
• returns a new context and a cancel function
  • WithTimeout takes one more arg (timeout duration)
  • when timeout duration is reached, context is auto canceled

ctx, cancelFunc = context.WithCancel(ctx)
ctx, cancelFunc = context.WithTimeout(ctx, 10 * time.Seconds)

• a context has a Done channel
  • canceling the context is to close the Done channel
  • calling cancelFunc closes the Done channel

up

• go-concurrency-context-use-case

down

reference

• Go Concurrency Patterns: Context - The Go Programming Language