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Merge pull request #278 from slingamn/bitset_again

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simplify CAS logic a bit
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Daniel Oaks 2018-07-12 20:05:26 +10:00 committed by GitHub
commit 1a5db02236
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1 changed files with 3 additions and 5 deletions
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8
irc/utils/bitset.go
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@ -37,17 +37,15 @@ func BitsetSet(set []uint64, position uint, on bool) (changed bool) {
mask = 1 << bit
for {
current := atomic.LoadUint64(addr)
previouslyOn := (current & mask) != 0
if on == previouslyOn {
return false
}
var desired uint64
if on {
desired = current | mask
} else {
desired = current & (^mask)
}
if atomic.CompareAndSwapUint64(addr, current, desired) {
if current == desired {
return false
} else if atomic.CompareAndSwapUint64(addr, current, desired) {
return true
}
}