You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
2.0 KiB
59 lines
2.0 KiB
3 years ago
|
// Copyright (c) 2021 Uber Technologies, Inc.
|
||
|
|
//
|
||
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
// of this software and associated documentation files (the "Software"), to deal
|
||
|
|
// in the Software without restriction, including without limitation the rights
|
||
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
// copies of the Software, and to permit persons to whom the Software is
|
||
|
|
// furnished to do so, subject to the following conditions:
|
||
|
|
//
|
||
|
|
// The above copyright notice and this permission notice shall be included in
|
||
|
|
// all copies or substantial portions of the Software.
|
||
|
|
//
|
||
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
|
|
// THE SOFTWARE.
|
||
|
|
|
||
|
|
package atomic
|
||
|
|
|
||
|
|
import (
|
||
|
|
"sync/atomic"
|
||
|
|
"unsafe"
|
||
|
|
)
|
||
|
|
|
||
|
|
// UnsafePointer is an atomic wrapper around unsafe.Pointer.
|
||
|
|
type UnsafePointer struct {
|
||
|
|
_ nocmp // disallow non-atomic comparison
|
||
|
|
|
||
|
|
v unsafe.Pointer
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewUnsafePointer creates a new UnsafePointer.
|
||
|
|
func NewUnsafePointer(val unsafe.Pointer) *UnsafePointer {
|
||
|
|
return &UnsafePointer{v: val}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Load atomically loads the wrapped value.
|
||
|
|
func (p *UnsafePointer) Load() unsafe.Pointer {
|
||
|
|
return atomic.LoadPointer(&p.v)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Store atomically stores the passed value.
|
||
|
|
func (p *UnsafePointer) Store(val unsafe.Pointer) {
|
||
|
|
atomic.StorePointer(&p.v, val)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Swap atomically swaps the wrapped unsafe.Pointer and returns the old value.
|
||
|
|
func (p *UnsafePointer) Swap(val unsafe.Pointer) (old unsafe.Pointer) {
|
||
|
|
return atomic.SwapPointer(&p.v, val)
|
||
|
|
}
|
||
|
|
|
||
|
|
// CAS is an atomic compare-and-swap.
|
||
|
|
func (p *UnsafePointer) CAS(old, new unsafe.Pointer) (swapped bool) {
|
||
|
|
return atomic.CompareAndSwapPointer(&p.v, old, new)
|
||
|
|
}
|