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gVisor bot
906eb6295d
- Redocument memory ordering from "no ordering" to "acquire-release". (No functional change: both LOCK WHATEVER on x86, and LDAXR/STLXR loops on ARM64, already have this property.) - Remove IncUnlessZeroInt32 and DecUnlessOneInt32, which were only faster than the equivalent loops using sync/atomic before the Go compiler inlined non-unsafe.Pointer atomics many releases ago. PiperOrigin-RevId: 295811743
48 lines
1.8 KiB
Go
48 lines
1.8 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build amd64 arm64
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// Package atomicbitops provides extensions to the sync/atomic package.
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//
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// All read-modify-write operations implemented by this package have
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// acquire-release memory ordering (like sync/atomic).
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package atomicbitops
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// AndUint32 atomically applies bitwise AND operation to *addr with val.
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func AndUint32(addr *uint32, val uint32)
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// OrUint32 atomically applies bitwise OR operation to *addr with val.
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func OrUint32(addr *uint32, val uint32)
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// XorUint32 atomically applies bitwise XOR operation to *addr with val.
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func XorUint32(addr *uint32, val uint32)
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// CompareAndSwapUint32 is like sync/atomic.CompareAndSwapUint32, but returns
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// the value previously stored at addr.
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func CompareAndSwapUint32(addr *uint32, old, new uint32) uint32
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// AndUint64 atomically applies bitwise AND operation to *addr with val.
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func AndUint64(addr *uint64, val uint64)
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// OrUint64 atomically applies bitwise OR operation to *addr with val.
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func OrUint64(addr *uint64, val uint64)
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// XorUint64 atomically applies bitwise XOR operation to *addr with val.
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func XorUint64(addr *uint64, val uint64)
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// CompareAndSwapUint64 is like sync/atomic.CompareAndSwapUint64, but returns
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// the value previously stored at addr.
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func CompareAndSwapUint64(addr *uint64, old, new uint64) uint64
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