45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
// Copyright 2018 Google Inc.
|
|
//
|
|
// 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 kvm
|
|
|
|
import (
|
|
"sync/atomic"
|
|
"unsafe"
|
|
)
|
|
|
|
// dirtySet tracks vCPUs for invalidation.
|
|
type dirtySet struct {
|
|
vCPUs []unsafe.Pointer
|
|
}
|
|
|
|
// makeDirtySet makes a new dirtySet.
|
|
func makeDirtySet(size int) dirtySet {
|
|
return dirtySet{
|
|
vCPUs: make([]unsafe.Pointer, size),
|
|
}
|
|
}
|
|
|
|
// size is the size of the set.
|
|
func (ds *dirtySet) size() int {
|
|
return len(ds.vCPUs)
|
|
}
|
|
|
|
// swap sets the given index and returns the previous value.
|
|
//
|
|
// The index is typically the id for a non-nil vCPU.
|
|
func (ds *dirtySet) swap(index int, c *vCPU) *vCPU {
|
|
return (*vCPU)(atomic.SwapPointer(&ds.vCPUs[index], unsafe.Pointer(c)))
|
|
}
|