mirror of
https://github.com/golang/go
synced 2024-10-05 12:21:22 -06:00
23e15f7253
The mutex, fdMutex, handles locking and lifetime of sysfd, and serializes Read and Write methods. This allows to strip 2 sync.Mutex.Lock calls, 2 sync.Mutex.Unlock calls, 1 defer and some amount of misc overhead from every network operation. On linux/amd64, Intel E5-2690: benchmark old ns/op new ns/op delta BenchmarkTCP4Persistent 9595 9454 -1.47% BenchmarkTCP4Persistent-2 8978 8772 -2.29% BenchmarkTCP4ConcurrentReadWrite 4900 4625 -5.61% BenchmarkTCP4ConcurrentReadWrite-2 2603 2500 -3.96% In general it strips 70-500 ns from every network operation depending on processor model. On my relatively new E5-2690 it accounts to ~5% of network op cost. Fixes #6074. R=golang-dev, bradfitz, alex.brainman, iant, mikioh.mikioh CC=golang-dev https://golang.org/cl/12418043
34 lines
910 B
Go
34 lines
910 B
Go
// Copyright 2011 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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package net
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import (
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"os"
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"syscall"
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"unsafe"
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)
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func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
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ip, err := interfaceToIPv4Addr(ifi)
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if err != nil {
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return os.NewSyscallError("setsockopt", err)
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}
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var a [4]byte
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copy(a[:], ip.To4())
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if err := fd.incref(); err != nil {
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return err
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}
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defer fd.decref()
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return os.NewSyscallError("setsockopt", syscall.Setsockopt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, (*byte)(unsafe.Pointer(&a[0])), 4))
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}
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func setIPv4MulticastLoopback(fd *netFD, v bool) error {
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if err := fd.incref(); err != nil {
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return err
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}
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defer fd.decref()
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return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v)))
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}
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