tree 144c2a0bbd0d56edf09f7b8737f4c9c40ee2cc39
parent 947224908606a5aa6af4427c3a2cea51387aa38a
author Aaron Jacobs <jacobsa@google.com> 1424212574 +1100
committer Sameer Ajmani <sameer@golang.org> 1424452952 +0000

context: Be clear that users must cancel the result of WithCancel.

This is necessary for cleanup of any goroutine that blocks on
ctx.Done(), as is done in e.g. propagateCancel in context.go. It is
already specified for WithTimeout and WithDeadline, whose descriptions I
have simplified here.

Change-Id: I6b30605decb8c0b7c1296c3f8852f9ad305ad4b7
Reviewed-on: https://go-review.googlesource.com/5022
Reviewed-by: Sameer Ajmani <sameer@golang.org>