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- // 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)
- }
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