github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/kernel/epoll/epoll_state.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package epoll
    16  
    17  import (
    18  	"github.com/SagerNet/gvisor/pkg/refs"
    19  	"github.com/SagerNet/gvisor/pkg/waiter"
    20  )
    21  
    22  // afterLoad is invoked by stateify.
    23  func (p *pollEntry) afterLoad() {
    24  	p.waiter.Callback = p
    25  	p.file = refs.NewWeakRef(p.id.File, p)
    26  	p.id.File.EventRegister(&p.waiter, p.mask)
    27  }
    28  
    29  // afterLoad is invoked by stateify.
    30  func (e *EventPoll) afterLoad() {
    31  	e.listsMu.Lock()
    32  	defer e.listsMu.Unlock()
    33  
    34  	for _, ls := range []*pollEntryList{&e.waitingList, &e.readyList, &e.disabledList} {
    35  		for it := ls.Front(); it != nil; it = it.Next() {
    36  			it.curList = ls
    37  		}
    38  	}
    39  
    40  	for it := e.waitingList.Front(); it != nil; {
    41  		entry := it
    42  		it = it.Next()
    43  
    44  		if entry.id.File.Readiness(entry.mask) != 0 {
    45  			e.waitingList.Remove(entry)
    46  			e.readyList.PushBack(entry)
    47  			entry.curList = &e.readyList
    48  			e.Notify(waiter.ReadableEvents)
    49  		}
    50  	}
    51  }