1 files changed, 46 insertions, 0 deletions
diff --git a/src/net/dial_gen.go b/src/net/dial_gen.go
new file mode 100644
index 000000000..ada623300
--- /dev/null
+++ b/src/net/dial_gen.go
@@ -0,0 +1,46 @@
+// Copyright 2012 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.
+
+// +build windows plan9
+
+package net
+
+import (
+	"time"
+)
+
+var testingIssue5349 bool // used during tests
+
+// dialChannel is the simple pure-Go implementation of dial, still
+// used on operating systems where the deadline hasn't been pushed
+// down into the pollserver. (Plan 9 and some old versions of Windows)
+func dialChannel(net string, ra Addr, dialer func(time.Time) (Conn, error), deadline time.Time) (Conn, error) {
+	var timeout time.Duration
+	if !deadline.IsZero() {
+		timeout = deadline.Sub(time.Now())
+	}
+	if timeout <= 0 {
+		return dialer(noDeadline)
+	}
+	t := time.NewTimer(timeout)
+	defer t.Stop()
+	type racer struct {
+		Conn
+		error
+	}
+	ch := make(chan racer, 1)
+	go func() {
+		if testingIssue5349 {
+			time.Sleep(time.Millisecond)
+		}
+		c, err := dialer(noDeadline)
+		ch <- racer{c, err}
+	}()
+	select {
+	case <-t.C:
+		return nil, &OpError{Op: "dial", Net: net, Addr: ra, Err: errTimeout}
+	case racer := <-ch:
+		return racer.Conn, racer.error
+	}
+}