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同步操作将从 CloudWeGo/netpoll 强制同步,此操作会覆盖自 Fork 仓库以来所做的任何修改,且无法恢复!!!
确定后同步将在后台操作,完成时将刷新页面,请耐心等待。
// Copyright 2021 CloudWeGo Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package netpoll
import (
"runtime"
"sync/atomic"
)
// FDOperator is a collection of operations on file descriptors.
type FDOperator struct {
// FD is file descriptor, poll will bind when register.
FD int
// The FDOperator provides three operations of reading, writing, and hanging.
// The poll actively fire the FDOperator when fd changes, no check the return value of FDOperator.
OnRead func(p Poll) error
OnWrite func(p Poll) error
OnHup func(p Poll) error
// The following is the required fn, which must exist when used, or directly panic.
// Fns are only called by the poll when handles connection events.
Inputs func(vs [][]byte) (rs [][]byte)
InputAck func(n int) (err error)
// Outputs will locked if len(rs) > 0, which need unlocked by OutputAck.
Outputs func(vs [][]byte) (rs [][]byte, supportZeroCopy bool)
OutputAck func(n int) (err error)
// poll is the registered location of the file descriptor.
poll Poll
// private, used by operatorCache
next *FDOperator
state int32 // CAS: 0(unused) 1(inuse) 2(do-done)
}
func (op *FDOperator) Control(event PollEvent) error {
return op.poll.Control(op, event)
}
func (op *FDOperator) do() (can bool) {
return atomic.CompareAndSwapInt32(&op.state, 1, 2)
}
func (op *FDOperator) done() {
atomic.StoreInt32(&op.state, 1)
}
func (op *FDOperator) inuse() {
for !atomic.CompareAndSwapInt32(&op.state, 0, 1) {
if atomic.LoadInt32(&op.state) == 1 {
return
}
runtime.Gosched()
}
}
func (op *FDOperator) unused() {
for !atomic.CompareAndSwapInt32(&op.state, 1, 0) {
if atomic.LoadInt32(&op.state) == 0 {
return
}
runtime.Gosched()
}
}
func (op *FDOperator) isUnused() bool {
return atomic.LoadInt32(&op.state) == 0
}
func (op *FDOperator) reset() {
op.FD = 0
op.OnRead, op.OnWrite, op.OnHup = nil, nil, nil
op.Inputs, op.InputAck = nil, nil
op.Outputs, op.OutputAck = nil, nil
op.poll = nil
}
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