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runtime: fix invariant comment in chan.go

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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>
This commit is contained in:
Russ Cox 2016-10-20 09:11:20 -04:00
parent 2693fa15ee
commit 39690beb58
1 changed files with 7 additions and 1 deletions
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8
src/runtime/chan.go
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@ -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"