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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !amd64
package atomicbitops
import (
"sync/atomic"
)
// AndUint32 atomically applies bitwise and operation to *addr with val.
func AndUint32(addr *uint32, val uint32) {
for {
o := atomic.LoadUint32(addr)
n := o & val
if atomic.CompareAndSwapUint32(addr, o, n) {
break
}
}
}
// OrUint32 atomically applies bitwise or operation to *addr with val.
func OrUint32(addr *uint32, val uint32) {
for {
o := atomic.LoadUint32(addr)
n := o | val
if atomic.CompareAndSwapUint32(addr, o, n) {
break
}
}
}
// XorUint32 atomically applies bitwise xor operation to *addr with val.
func XorUint32(addr *uint32, val uint32) {
for {
o := atomic.LoadUint32(addr)
n := o ^ val
if atomic.CompareAndSwapUint32(addr, o, n) {
break
}
}
}
// CompareAndSwapUint32 is like sync/atomic.CompareAndSwapUint32, but returns
// the value previously stored at addr.
func CompareAndSwapUint32(addr *uint32, old, new uint32) (prev uint32) {
for {
prev = atomic.LoadUint32(addr)
if prev != old {
return
}
if atomic.CompareAndSwapUint32(addr, old, new) {
return
}
}
}
// AndUint64 atomically applies bitwise and operation to *addr with val.
func AndUint64(addr *uint64, val uint64) {
for {
o := atomic.LoadUint64(addr)
n := o & val
if atomic.CompareAndSwapUint64(addr, o, n) {
break
}
}
}
// OrUint64 atomically applies bitwise or operation to *addr with val.
func OrUint64(addr *uint64, val uint64) {
for {
o := atomic.LoadUint64(addr)
n := o | val
if atomic.CompareAndSwapUint64(addr, o, n) {
break
}
}
}
// XorUint64 atomically applies bitwise xor operation to *addr with val.
func XorUint64(addr *uint64, val uint64) {
for {
o := atomic.LoadUint64(addr)
n := o ^ val
if atomic.CompareAndSwapUint64(addr, o, n) {
break
}
}
}
// CompareAndSwapUint64 is like sync/atomic.CompareAndSwapUint64, but returns
// the value previously stored at addr.
func CompareAndSwapUint64(addr *uint64, old, new uint64) (prev uint64) {
for {
prev = atomic.LoadUint64(addr)
if prev != old {
return
}
if atomic.CompareAndSwapUint64(addr, old, new) {
return
}
}
}
// IncUnlessZeroInt32 increments the value stored at the given address and
// returns true; unless the value stored in the pointer is zero, in which case
// it is left unmodified and false is returned.
func IncUnlessZeroInt32(addr *int32) bool {
for {
v := atomic.LoadInt32(addr)
if v == 0 {
return false
}
if atomic.CompareAndSwapInt32(addr, v, v+1) {
return true
}
}
}
// DecUnlessOneInt32 decrements the value stored at the given address and
// returns true; unless the value stored in the pointer is 1, in which case it
// is left unmodified and false is returned.
func DecUnlessOneInt32(addr *int32) bool {
for {
v := atomic.LoadInt32(addr)
if v == 1 {
return false
}
if atomic.CompareAndSwapInt32(addr, v, v-1) {
return true
}
}
}
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