tree 356ccf3d70d93d3bdb7b2a93b616a0ad748b4531
parent 1a26cf06691746ee35aa7113c9b37289afc7ea28
author Tom Bergan <tombergan@google.com> 1494876563 -0700
committer Tom Bergan <tombergan@google.com> 1495584225 +0000

http2: remove extra goroutine stack from awaitGracefulShutdown

This is a better fix that https://golang.org/cl/43455. Instead of
creating a separate goroutine to wait for the global shutdown channel,
we reuse the new serverMsgCh, which was added in a prior CL.

We also use the new net/http.Server.RegisterOnShutdown method to
register a shutdown callback for each http2.Server.

Updates golang/go#20302
Updates golang/go#18471

Change-Id: Icf29d5e4f65b3779d1fb4ea92924e4fb6bdadb2a
Reviewed-on: https://go-review.googlesource.com/43230
Run-TryBot: Tom Bergan <tombergan@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>