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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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"golang.org/x/net/internal/iana"
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"golang.org/x/net/internal/nettest"
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"golang.org/x/net/ipv6"
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func benchmarkUDPListener() (net.PacketConn, net.Addr, error) {
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c, err := net.ListenPacket("udp6", "[::1]:0")
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dst, err := net.ResolveUDPAddr("udp6", c.LocalAddr().String())
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func BenchmarkReadWriteNetUDP(b *testing.B) {
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b.Skip("ipv6 is not supported")
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c, dst, err := benchmarkUDPListener()
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wb, rb := []byte("HELLO-R-U-THERE"), make([]byte, 128)
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for i := 0; i < b.N; i++ {
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benchmarkReadWriteNetUDP(b, c, wb, rb, dst)
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func benchmarkReadWriteNetUDP(b *testing.B, c net.PacketConn, wb, rb []byte, dst net.Addr) {
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if _, err := c.WriteTo(wb, dst); err != nil {
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if _, _, err := c.ReadFrom(rb); err != nil {
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func BenchmarkReadWriteIPv6UDP(b *testing.B) {
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b.Skip("ipv6 is not supported")
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c, dst, err := benchmarkUDPListener()
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p := ipv6.NewPacketConn(c)
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cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
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if err := p.SetControlMessage(cf, true); err != nil {
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ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
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wb, rb := []byte("HELLO-R-U-THERE"), make([]byte, 128)
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for i := 0; i < b.N; i++ {
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benchmarkReadWriteIPv6UDP(b, p, wb, rb, dst, ifi)
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func benchmarkReadWriteIPv6UDP(b *testing.B, p *ipv6.PacketConn, wb, rb []byte, dst net.Addr, ifi *net.Interface) {
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cm := ipv6.ControlMessage{
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TrafficClass: iana.DiffServAF11 | iana.CongestionExperienced,
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cm.IfIndex = ifi.Index
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if n, err := p.WriteTo(wb, &cm, dst); err != nil {
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} else if n != len(wb) {
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b.Fatalf("got %v; want %v", n, len(wb))
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if _, _, _, err := p.ReadFrom(rb); err != nil {
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func TestPacketConnConcurrentReadWriteUnicastUDP(t *testing.T) {
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switch runtime.GOOS {
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case "nacl", "plan9", "solaris", "windows":
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t.Skipf("not supported on %s", runtime.GOOS)
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t.Skip("ipv6 is not supported")
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c, err := net.ListenPacket("udp6", "[::1]:0")
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p := ipv6.NewPacketConn(c)
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dst, err := net.ResolveUDPAddr("udp6", c.LocalAddr().String())
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ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
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cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
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wb := []byte("HELLO-R-U-THERE")
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if err := p.SetControlMessage(cf, true); err != nil { // probe before test
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if nettest.ProtocolNotSupported(err) {
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t.Skipf("not supported on %s", runtime.GOOS)
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var wg sync.WaitGroup
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rb := make([]byte, 128)
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if n, cm, _, err := p.ReadFrom(rb); err != nil {
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} else if !bytes.Equal(rb[:n], wb) {
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t.Errorf("got %v; want %v", rb[:n], wb)
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t.Logf("rcvd cmsg: %v", cm)
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writer := func(toggle bool) {
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cm := ipv6.ControlMessage{
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TrafficClass: iana.DiffServAF11 | iana.CongestionExperienced,
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Src: net.IPv6loopback,
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cm.IfIndex = ifi.Index
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if err := p.SetControlMessage(cf, toggle); err != nil {
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if n, err := p.WriteTo(wb, &cm, dst); err != nil {
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} else if n != len(wb) {
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t.Errorf("got %v; want %v", n, len(wb))
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for i := 0; i < N; i++ {
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for i := 0; i < 2*N; i++ {
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for i := 0; i < N; i++ {