45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
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// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kvm
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import (
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"sync/atomic"
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"unsafe"
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)
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// dirtySet tracks vCPUs for invalidation.
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type dirtySet struct {
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vCPUs []unsafe.Pointer
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}
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// makeDirtySet makes a new dirtySet.
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func makeDirtySet(size int) dirtySet {
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return dirtySet{
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vCPUs: make([]unsafe.Pointer, size),
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}
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}
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// size is the size of the set.
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func (ds *dirtySet) size() int {
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return len(ds.vCPUs)
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}
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// swap sets the given index and returns the previous value.
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//
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// The index is typically the id for a non-nil vCPU.
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func (ds *dirtySet) swap(index int, c *vCPU) *vCPU {
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return (*vCPU)(atomic.SwapPointer(&ds.vCPUs[index], unsafe.Pointer(c)))
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}
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