From b3fd434ae07db5cf6385fb6b97a467e6f312c253 Mon Sep 17 00:00:00 2001
From: Robert Daniel Kortschak <dan.kortschak@adelaide.edu.au>
Date: Thu, 29 Aug 2013 17:14:57 +1000
Subject: [PATCH] net: make channel-based semaphore depend on receive, not send

R=r, dvyukov
CC=golang-dev
https://golang.org/cl/13348045
---
 src/pkg/net/net.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/pkg/net/net.go b/src/pkg/net/net.go
index c918e96b430..4f177c64edf 100644
--- a/src/pkg/net/net.go
+++ b/src/pkg/net/net.go
@@ -442,10 +442,16 @@ func (d *deadline) setTime(t time.Time) {
 
 var threadLimit = make(chan struct{}, 500)
 
+func init() {
+	for i := 0; i < cap(threadLimit); i++ {
+		threadLimit <- struct{}{}
+	}
+}
+
 func acquireThread() {
-	threadLimit <- struct{}{}
+	<-threadLimit
 }
 
 func releaseThread() {
-	<-threadLimit
+	threadLimit <- struct{}{}
 }