1 // Copyright 2012 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build windows plan9 6 7 package net 8 9 import "time" 10 11 // dialChannel is the simple pure-Go implementation of dial, still 12 // used on operating systems where the deadline hasn't been pushed 13 // down into the pollserver. (Plan 9 and some old versions of Windows) 14 func dialChannel(net string, ra Addr, dialer func(time.Time) (Conn, error), deadline time.Time) (Conn, error) { 15 if deadline.IsZero() { 16 return dialer(noDeadline) 17 } 18 timeout := deadline.Sub(time.Now()) 19 if timeout <= 0 { 20 return nil, &OpError{Op: "dial", Net: net, Source: nil, Addr: ra, Err: errTimeout} 21 } 22 t := time.NewTimer(timeout) 23 defer t.Stop() 24 type racer struct { 25 Conn 26 error 27 } 28 ch := make(chan racer, 1) 29 go func() { 30 testHookDialChannel() 31 c, err := dialer(noDeadline) 32 ch <- racer{c, err} 33 }() 34 select { 35 case <-t.C: 36 return nil, &OpError{Op: "dial", Net: net, Source: nil, Addr: ra, Err: errTimeout} 37 case racer := <-ch: 38 return racer.Conn, racer.error 39 } 40 } 41
