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simplify CAS logic a bit

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This commit is contained in:
Shivaram Lingamneni 2018-07-02 16:33:39 -04:00
parent 6ba741814d
commit 318da22448
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 mask = 1 << bit
for { for {
current := atomic.LoadUint64(addr) current := atomic.LoadUint64(addr)
previouslyOn := (current & mask) != 0
if on == previouslyOn {
return false
}
var desired uint64 var desired uint64
if on { if on {
desired = current | mask desired = current | mask
} else { } else {
desired = current & (^mask) desired = current & (^mask)
} }
if atomic.CompareAndSwapUint64(addr, current, desired) { if current == desired {
return false
} else if atomic.CompareAndSwapUint64(addr, current, desired) {
return true return true
} }
} }