libgo/go/net/z_last_test.go

   1 // Copyright 2009 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 package net
   6
   7 import (
   8         "flag"
   9         "fmt"
  10         "testing"
  11 )
  12
  13 var testDNSFlood = flag.Bool("dnsflood", false, "whether to test dns query flooding")
  14
  15 func TestDNSThreadLimit(t *testing.T) {
  16         if !*testDNSFlood {
  17                 t.Skip("test disabled; use -dnsflood to enable")
  18         }
  19
  20         const N = 10000
  21         c := make(chan int, N)
  22         for i := 0; i < N; i++ {
  23                 go func(i int) {
  24                         LookupIP(fmt.Sprintf("%d.net-test.golang.org", i))
  25                         c <- 1
  26                 }(i)
  27         }
  28         // Don't bother waiting for the stragglers; stop at 0.9 N.
  29         for i := 0; i < N*9/10; i++ {
  30                 if i%100 == 0 {
  31                         //println("TestDNSThreadLimit:", i)
  32                 }
  33                 <-c
  34         }
  35
  36         // If we're still here, it worked.
  37 }