From: Russ Cox <rsc@golang.org>
Date: Thu, 20 Oct 2016 13:11:20 +0000 (-0400)
Subject: runtime: fix invariant comment in chan.go
X-Git-Tag: go1.8beta1~686
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=39690beb5885d378d98117c3d57b494e97f16eea;p=gostls13.git

runtime: fix invariant comment in chan.go

Change-Id: Ic6317f186d0ee68ab1f2d15be9a966a152f61bfb
Reviewed-on: https://go-review.googlesource.com/31610
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
---

diff --git a/src/runtime/chan.go b/src/runtime/chan.go
index 712ad8cef9..261d37d4ee 100644
--- a/src/runtime/chan.go
+++ b/src/runtime/chan.go
@@ -7,10 +7,16 @@ package runtime
 // This file contains the implementation of Go channels.
 
 // Invariants:
-//  At least one of c.sendq and c.recvq is empty.
+//  At least one of c.sendq and c.recvq is empty,
+//  except for the case of an unbuffered channel with a single goroutine
+//  blocked on it for both sending and receiving using a select statement,
+//  in which case the length of c.sendq and c.recvq is limited only by the
+//  size of the select statement.
+//
 // For buffered channels, also:
 //  c.qcount > 0 implies that c.recvq is empty.
 //  c.qcount < c.dataqsiz implies that c.sendq is empty.
+
 import (
 	"runtime/internal/atomic"
 	"unsafe"