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