/usr/share/gocode/src/code.google.com/p/go.net/netutil/listen.go is in golang-go.net-dev 0.0~hg20131201-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | // Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package netutil provides network utility functions, complementing the more
// common ones in the net package.
package netutil
import (
"net"
"sync"
)
// LimitListener returns a Listener that accepts at most n simultaneous
// connections from the provided Listener.
func LimitListener(l net.Listener, n int) net.Listener {
ch := make(chan struct{}, n)
for i := 0; i < n; i++ {
ch <- struct{}{}
}
return &limitListener{l, ch}
}
type limitListener struct {
net.Listener
ch chan struct{}
}
func (l *limitListener) Accept() (net.Conn, error) {
<-l.ch
c, err := l.Listener.Accept()
if err != nil {
return nil, err
}
return &limitListenerConn{Conn: c, ch: l.ch}, nil
}
type limitListenerConn struct {
net.Conn
ch chan<- struct{}
close sync.Once
}
func (l *limitListenerConn) Close() error {
err := l.Conn.Close()
l.close.Do(func() {
l.ch <- struct{}{}
})
return err
}
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