aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/google.golang.org/protobuf/internal/impl/pointer_unsafe_opaque.go
blob: 38aa7b7dcf230dbb6d6905104a59dbf948777541 (plain) (blame)
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
42
// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package impl

import (
	"sync/atomic"
	"unsafe"
)

func (p pointer) AtomicGetPointer() pointer {
	return pointer{p: atomic.LoadPointer((*unsafe.Pointer)(p.p))}
}

func (p pointer) AtomicSetPointer(v pointer) {
	atomic.StorePointer((*unsafe.Pointer)(p.p), v.p)
}

func (p pointer) AtomicSetNilPointer() {
	atomic.StorePointer((*unsafe.Pointer)(p.p), unsafe.Pointer(nil))
}

func (p pointer) AtomicSetPointerIfNil(v pointer) pointer {
	if atomic.CompareAndSwapPointer((*unsafe.Pointer)(p.p), unsafe.Pointer(nil), v.p) {
		return v
	}
	return pointer{p: atomic.LoadPointer((*unsafe.Pointer)(p.p))}
}

type atomicV1MessageInfo struct{ p Pointer }

func (mi *atomicV1MessageInfo) Get() Pointer {
	return Pointer(atomic.LoadPointer((*unsafe.Pointer)(&mi.p)))
}

func (mi *atomicV1MessageInfo) SetIfNil(p Pointer) Pointer {
	if atomic.CompareAndSwapPointer((*unsafe.Pointer)(&mi.p), nil, unsafe.Pointer(p)) {
		return p
	}
	return mi.Get()
}