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epoll.go
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epoll.go
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// Copyright (c) 2023 cheng-zhongliang. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux
// +build linux
package event
import (
"sync"
"syscall"
"time"
"unsafe"
)
const (
initialNEvent = 0x20
maxNEvent = 0x1000
)
var evPool = sync.Pool{
New: func() interface{} {
return new(fdEvent)
},
}
type fdEvent struct {
r *Event
w *Event
evs uint32
}
type poll struct {
fd int
fdEvents map[int]*fdEvent
events []syscall.EpollEvent
}
func openPoll() (*poll, error) {
ep := new(poll)
fd, err := syscall.EpollCreate1(0)
if err != nil {
return nil, err
}
ep.fd = fd
ep.fdEvents = make(map[int]*fdEvent, initialNEvent)
ep.events = make([]syscall.EpollEvent, initialNEvent)
return ep, nil
}
func (ep *poll) add(ev *Event) error {
op := syscall.EPOLL_CTL_ADD
es, ok := ep.fdEvents[ev.fd]
if ok {
op = syscall.EPOLL_CTL_MOD
} else {
es = evPool.Get().(*fdEvent)
ep.fdEvents[ev.fd] = es
}
if ev.events&EvRead != 0 {
es.r = ev
es.evs |= syscall.EPOLLIN
}
if ev.events&EvWrite != 0 {
es.w = ev
es.evs |= syscall.EPOLLOUT
}
epEv := syscall.EpollEvent{Events: es.evs}
*(**fdEvent)(unsafe.Pointer(&epEv.Fd)) = es
return syscall.EpollCtl(ep.fd, op, ev.fd, &epEv)
}
func (ep *poll) del(ev *Event) error {
es := ep.fdEvents[ev.fd]
if ev.events&EvRead != 0 {
es.r = nil
es.evs &^= syscall.EPOLLIN
}
if ev.events&EvWrite != 0 {
es.w = nil
es.evs &^= syscall.EPOLLOUT
}
op := syscall.EPOLL_CTL_DEL
if es.evs&(syscall.EPOLLIN|syscall.EPOLLOUT) == 0 {
delete(ep.fdEvents, ev.fd)
evPool.Put(es)
} else {
op = syscall.EPOLL_CTL_MOD
}
epEv := syscall.EpollEvent{Events: es.evs}
*(**fdEvent)(unsafe.Pointer(&epEv.Fd)) = es
return syscall.EpollCtl(ep.fd, op, ev.fd, &epEv)
}
func (ep *poll) wait(cb func(ev *Event, res uint32), timeout time.Duration) error {
ms := -1
if timeout >= 0 {
ms = int(timeout.Milliseconds())
}
n, err := syscall.EpollWait(ep.fd, ep.events, ms)
if err != nil && !temporaryErr(err) {
return err
}
for i := 0; i < n; i++ {
var evRead, evWrite *Event
what := ep.events[i].Events
es := *(**fdEvent)(unsafe.Pointer(&ep.events[i].Fd))
if what&(syscall.EPOLLERR|syscall.EPOLLHUP) != 0 {
what |= syscall.EPOLLIN | syscall.EPOLLOUT
}
if what&syscall.EPOLLIN != 0 {
evRead = es.r
}
if what&syscall.EPOLLOUT != 0 {
evWrite = es.w
}
if evRead != nil {
cb(evRead, evRead.events&EvRead)
}
if evWrite != nil {
cb(evWrite, evWrite.events&EvWrite)
}
}
if n == len(ep.events) && n < maxNEvent {
ep.events = make([]syscall.EpollEvent, n<<1)
}
return nil
}
func (ep *poll) close() error {
return syscall.Close(ep.fd)
}