net/http/internal/http2: do some follow-ups to serve parking change Fix a rebase comment mishap: the doc comment describing canPark was attached to the http2serveparking var, leaving canPark undocumented. Skip the parkMu accounting in beginServeSend and endServeSend on connections that can never park (no OnClose hook, or parking disabled with GODEBUG=http2serveparking=0), removing a mutex round trip per frame on both the sender and receiver side. Add a test that a response blocked on the peer's flow control window parks the serve goroutine with its DATA queued in the write scheduler, and that a WINDOW_UPDATE revives it. Updates #80735 Updates #81524 Change-Id: Ic1a3f7b9d2e5a4c8f6b0d7a9e3c5f2b8d1a6e4c7 Reviewed-on: https://go-review.googlesource.com/c/go/+/832504 LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Nicholas Husin <husin@google.com> Reviewed-by: Nicholas Husin <nsh@golang.org>
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