60 lines
2.5 KiB
Go
60 lines
2.5 KiB
Go
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// Copyright 2018 Google Inc.
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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
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// Package atomicbitops provides basic bitwise operations in an atomic way.
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// The implementation on amd64 leverages the LOCK prefix directly instead of
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// relying on the generic cas primitives.
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//
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// WARNING: the bitwise ops provided in this package doesn't imply any memory
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// ordering. Using them to construct locks must employ proper memory barriers.
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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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// IncUnlessZeroInt32 increments the value stored at the given address and
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// returns true; unless the value stored in the pointer is zero, in which case
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// it is left unmodified and false is returned.
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func IncUnlessZeroInt32(addr *int32) bool
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// DecUnlessOneInt32 decrements the value stored at the given address and
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// returns true; unless the value stored in the pointer is 1, in which case it
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// is left unmodified and false is returned.
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func DecUnlessOneInt32(addr *int32) bool
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