mirror of https://github.com/tidwall/evio.git
126 lines
2.6 KiB
Go
126 lines
2.6 KiB
Go
// Copyright 2017 Joshua J Baker. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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// +build darwin netbsd freebsd openbsd dragonfly
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package internal
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import (
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"syscall"
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)
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// Poll ...
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type Poll struct {
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fd int
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changes []syscall.Kevent_t
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notes noteQueue
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}
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// OpenPoll ...
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func OpenPoll() *Poll {
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l := new(Poll)
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p, err := syscall.Kqueue()
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if err != nil {
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panic(err)
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}
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l.fd = p
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_, err = syscall.Kevent(l.fd, []syscall.Kevent_t{{
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Ident: 0,
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Filter: syscall.EVFILT_USER,
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Flags: syscall.EV_ADD | syscall.EV_CLEAR,
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}}, nil, nil)
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if err != nil {
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panic(err)
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}
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return l
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}
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// Close ...
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func (p *Poll) Close() error {
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return syscall.Close(p.fd)
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}
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// Trigger ...
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func (p *Poll) Trigger(note interface{}) error {
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p.notes.Add(note)
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_, err := syscall.Kevent(p.fd, []syscall.Kevent_t{{
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Ident: 0,
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Filter: syscall.EVFILT_USER,
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Fflags: syscall.NOTE_TRIGGER,
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}}, nil, nil)
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return err
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}
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// Wait ...
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func (p *Poll) Wait(iter func(fd int, note interface{}) error) error {
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events := make([]syscall.Kevent_t, 128)
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for {
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n, err := syscall.Kevent(p.fd, p.changes, events, nil)
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if err != nil && err != syscall.EINTR {
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return err
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}
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p.changes = p.changes[:0]
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if err := p.notes.ForEach(func(note interface{}) error {
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return iter(0, note)
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}); err != nil {
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return err
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}
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for i := 0; i < n; i++ {
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if fd := int(events[i].Ident); fd != 0 {
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if err := iter(fd, nil); err != nil {
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return err
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}
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}
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}
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}
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}
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// AddRead ...
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func (p *Poll) AddRead(fd int) {
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p.changes = append(p.changes,
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syscall.Kevent_t{
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Ident: uint64(fd), Flags: syscall.EV_ADD, Filter: syscall.EVFILT_READ,
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},
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)
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}
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// AddReadWrite ...
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func (p *Poll) AddReadWrite(fd int) {
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p.changes = append(p.changes,
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syscall.Kevent_t{
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Ident: uint64(fd), Flags: syscall.EV_ADD, Filter: syscall.EVFILT_READ,
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},
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syscall.Kevent_t{
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Ident: uint64(fd), Flags: syscall.EV_ADD, Filter: syscall.EVFILT_WRITE,
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},
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)
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}
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// ModRead ...
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func (p *Poll) ModRead(fd int) {
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p.changes = append(p.changes, syscall.Kevent_t{
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Ident: uint64(fd), Flags: syscall.EV_DELETE, Filter: syscall.EVFILT_WRITE,
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})
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}
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// ModReadWrite ...
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func (p *Poll) ModReadWrite(fd int) {
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p.changes = append(p.changes, syscall.Kevent_t{
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Ident: uint64(fd), Flags: syscall.EV_ADD, Filter: syscall.EVFILT_WRITE,
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})
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}
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// ModDetach ...
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func (p *Poll) ModDetach(fd int) {
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p.changes = append(p.changes,
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syscall.Kevent_t{
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Ident: uint64(fd), Flags: syscall.EV_DELETE, Filter: syscall.EVFILT_READ,
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},
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syscall.Kevent_t{
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Ident: uint64(fd), Flags: syscall.EV_DELETE, Filter: syscall.EVFILT_WRITE,
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},
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)
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}
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