Wrong list :) You meant to link here: https://godoc.org/context#Context.Err
On Tue, Feb 21, 2017 at 8:15 PM, 'Thomas Bushnell, BSG' via golang-nuts < golang-nuts@googlegroups.com> wrote: > On Mon, Feb 20, 2017 at 11:42 AM Ian Lance Taylor <i...@golang.org> wrote: > >> On Sun, Feb 19, 2017 at 2:57 PM, <so.qu...@gmail.com> wrote: >> > Thanks, I see you build it up with decorators on a standard prototype. >> > For example: https://play.golang.org/p/PJy5lE9QqF >> > >> > So context.Done is a convenience function for those that require it? >> > Otherwise a context will expire after it leaves scope, so Done does not >> need >> > to be called? >> >> Cancelling the context just marks the context as cancelled. It does >> not actually stop any goroutines using the context. Those goroutines >> must themselves periodically check the context to see whether it has >> been cancelled, and, if so, stop working. They do that by calling >> either the Done or Err method; it's much more common to call the Done >> method (and check whether the channel is closed). >> > > Calling the Err() method to see if the context has been cancelled is > incorrect. See https://godoc.corp.google.com/pkg/google3/go/context/ > context#Context.Err: "Err's return value is unspecified before Done is > closed." > > Thomas > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
