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// Copyright 2018 The gVisor 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 transport
// saveAcceptedChan is invoked by stateify.
func (e *connectionedEndpoint) saveAcceptedChan() []*connectionedEndpoint {
// If acceptedChan is nil (i.e. we are not listening) then we will save nil.
// Otherwise we create a (possibly empty) slice of the values in acceptedChan and
// save that.
var acceptedSlice []*connectionedEndpoint
if e.acceptedChan != nil {
// Swap out acceptedChan with a new empty channel of the same capacity.
saveChan := e.acceptedChan
e.acceptedChan = make(chan *connectionedEndpoint, cap(saveChan))
// Create a new slice with the same len and capacity as the channel.
acceptedSlice = make([]*connectionedEndpoint, len(saveChan), cap(saveChan))
// Drain acceptedChan into saveSlice, and fill up the new acceptChan at the
// same time.
for i := range acceptedSlice {
ep := <-saveChan
acceptedSlice[i] = ep
e.acceptedChan <- ep
}
close(saveChan)
}
return acceptedSlice
}
// loadAcceptedChan is invoked by stateify.
func (e *connectionedEndpoint) loadAcceptedChan(acceptedSlice []*connectionedEndpoint) {
// If acceptedSlice is nil, then acceptedChan should also be nil.
if acceptedSlice != nil {
// Otherwise, create a new channel with the same capacity as acceptedSlice.
e.acceptedChan = make(chan *connectionedEndpoint, cap(acceptedSlice))
// Seed the channel with values from acceptedSlice.
for _, ep := range acceptedSlice {
e.acceptedChan <- ep
}
}
}
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