mirror of
https://github.com/hanzozt/foundation.git
synced 2026-10-30 14:42:04 +00:00
Paul Lorenz
95a4bfc777
* move util up a level * rename common to versions * remove pfxlog from versions * remove neatcat and echo server * move udp code to transport * remove agent, identity and metrics, which have been split out * remove config which was unused
71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
/*
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Copyright NetFoundry Inc.
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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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https://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package concurrenz
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import "sync/atomic"
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type AtomicBitSet uint32
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func (self *AtomicBitSet) Set(index int, val bool) {
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done := false
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for !done {
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current := self.Load()
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next := setBitAtIndex(current, index, val)
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done = self.CompareAndSetAll(current, next)
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}
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}
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func (self *AtomicBitSet) IsSet(index int) bool {
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return isBitSetAtIndex(self.Load(), index)
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}
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func (self *AtomicBitSet) CompareAndSet(index int, current, next bool) bool {
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for {
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currentSet := self.Load()
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if isBitSetAtIndex(currentSet, index) != current {
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return false
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}
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nextSet := setBitAtIndex(currentSet, index, next)
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if self.CompareAndSetAll(currentSet, nextSet) {
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return true
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}
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}
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}
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func (self *AtomicBitSet) Store(val uint32) {
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atomic.StoreUint32((*uint32)(self), val)
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}
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func (self *AtomicBitSet) Load() uint32 {
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return atomic.LoadUint32((*uint32)(self))
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}
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func (self *AtomicBitSet) CompareAndSetAll(current, next uint32) bool {
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return atomic.CompareAndSwapUint32((*uint32)(self), current, next)
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}
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func setBitAtIndex(bitset uint32, index int, val bool) uint32 {
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if val {
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return bitset | (1 << index)
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}
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return bitset & ^(1 << index)
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}
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func isBitSetAtIndex(bitset uint32, index int) bool {
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return bitset&(1<<index) != 0
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}
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