mirror of
https://github.com/golang/go
synced 2024-10-04 22:21:22 -06:00
a3d1045fb7
parsing and printing to new syntax. Use -oldparser to parse the old syntax, use -oldprinter to print the old syntax. 2) Change default gofmt formatting settings to use tabs for indentation only and to use spaces for alignment. This will make the code alignment insensitive to an editor's tabwidth. Use -spaces=false to use tabs for alignment. 3) Manually changed src/exp/parser/parser_test.go so that it doesn't try to parse the parser's source files using the old syntax (they have new syntax now). 4) gofmt -w src misc test/bench 3rd set of files. R=rsc CC=golang-dev https://golang.org/cl/180048
150 lines
3.3 KiB
Go
150 lines
3.3 KiB
Go
// Copyright 2009 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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// Waiting for FDs via epoll(7).
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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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)
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const (
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readFlags = syscall.EPOLLIN | syscall.EPOLLRDHUP
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writeFlags = syscall.EPOLLOUT
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)
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type pollster struct {
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epfd int
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// Events we're already waiting for
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events map[int]uint32
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}
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func newpollster() (p *pollster, err os.Error) {
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p = new(pollster)
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var e int
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// The arg to epoll_create is a hint to the kernel
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// about the number of FDs we will care about.
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// We don't know.
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if p.epfd, e = syscall.EpollCreate(16); e != 0 {
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return nil, os.NewSyscallError("epoll_create", e)
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}
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p.events = make(map[int]uint32)
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return p, nil
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}
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func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
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var ev syscall.EpollEvent
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var already bool
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ev.Fd = int32(fd)
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ev.Events, already = p.events[fd]
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if !repeat {
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ev.Events |= syscall.EPOLLONESHOT
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}
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if mode == 'r' {
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ev.Events |= readFlags
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} else {
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ev.Events |= writeFlags
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}
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var op int
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if already {
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op = syscall.EPOLL_CTL_MOD
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} else {
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op = syscall.EPOLL_CTL_ADD
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}
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if e := syscall.EpollCtl(p.epfd, op, fd, &ev); e != 0 {
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return os.NewSyscallError("epoll_ctl", e)
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}
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p.events[fd] = ev.Events
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return nil
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}
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func (p *pollster) StopWaiting(fd int, bits uint) {
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events, already := p.events[fd]
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if !already {
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print("Epoll unexpected fd=", fd, "\n")
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return
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}
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// If syscall.EPOLLONESHOT is not set, the wait
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// is a repeating wait, so don't change it.
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if events&syscall.EPOLLONESHOT == 0 {
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return
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}
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// Disable the given bits.
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// If we're still waiting for other events, modify the fd
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// event in the kernel. Otherwise, delete it.
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events &= ^uint32(bits)
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if int32(events)&^syscall.EPOLLONESHOT != 0 {
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var ev syscall.EpollEvent
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ev.Fd = int32(fd)
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ev.Events = events
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if e := syscall.EpollCtl(p.epfd, syscall.EPOLL_CTL_MOD, fd, &ev); e != 0 {
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print("Epoll modify fd=", fd, ": ", os.Errno(e).String(), "\n")
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}
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p.events[fd] = events
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} else {
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if e := syscall.EpollCtl(p.epfd, syscall.EPOLL_CTL_DEL, fd, nil); e != 0 {
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print("Epoll delete fd=", fd, ": ", os.Errno(e).String(), "\n")
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}
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p.events[fd] = 0, false
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}
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}
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func (p *pollster) DelFD(fd int, mode int) {
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if mode == 'r' {
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p.StopWaiting(fd, readFlags)
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} else {
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p.StopWaiting(fd, writeFlags)
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}
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}
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func (p *pollster) WaitFD(nsec int64) (fd int, mode int, err os.Error) {
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// Get an event.
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var evarray [1]syscall.EpollEvent
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ev := &evarray[0]
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var msec int = -1
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if nsec > 0 {
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msec = int((nsec + 1e6 - 1) / 1e6)
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}
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n, e := syscall.EpollWait(p.epfd, &evarray, msec)
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for e == syscall.EAGAIN || e == syscall.EINTR {
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n, e = syscall.EpollWait(p.epfd, &evarray, msec)
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}
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if e != 0 {
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return -1, 0, os.NewSyscallError("epoll_wait", e)
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}
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if n == 0 {
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return -1, 0, nil
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}
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fd = int(ev.Fd)
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if ev.Events&writeFlags != 0 {
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p.StopWaiting(fd, writeFlags)
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return fd, 'w', nil
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}
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if ev.Events&readFlags != 0 {
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p.StopWaiting(fd, readFlags)
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return fd, 'r', nil
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}
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// Other events are error conditions - wake whoever is waiting.
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events, _ := p.events[fd]
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if events&writeFlags != 0 {
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p.StopWaiting(fd, writeFlags)
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return fd, 'w', nil
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}
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p.StopWaiting(fd, readFlags)
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return fd, 'r', nil
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}
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func (p *pollster) Close() os.Error {
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return os.NewSyscallError("close", syscall.Close(p.epfd))
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}
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