blob: fe3e4a1ca86343a9f10654993211dd7524fe820c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
// Copyright 2020 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 refsvfs2 defines an interface for a reference-counted object.
package refsvfs2
import (
"gvisor.dev/gvisor/pkg/context"
)
// RefCounter is the interface to be implemented by objects that are reference
// counted.
type RefCounter interface {
// IncRef increments the reference counter on the object.
IncRef()
// DecRef decrements the object's reference count. Users of refs_template.Refs
// may specify a destructor to be called once the reference count reaches zero.
DecRef(ctx context.Context)
}
// TryRefCounter is like RefCounter but allow the ref increment to be tried.
type TryRefCounter interface {
RefCounter
// TryIncRef attempts to increment the reference count, but may fail if all
// references have already been dropped, in which case it returns false. If
// true is returned, then a valid reference is now held on the object.
TryIncRef() bool
}
|
