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Update state by one bit #264

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Dec 3, 2024
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Update state by one bit #264

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10 changes: 7 additions & 3 deletions types/types.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,15 +20,19 @@ const (
// State enumerates possible slot states.
type State byte

// State values are intentionally chosen in a way where following states differ by one bit only.
// It is designed this way to guarantee that goroutines read (maybe outdated but) valid state values.
// This hack is probably not needed because x86 CPUs guarantee write consistency on DWORD level,
// but this business is crazy and nothing is going to surprise me.
const (
// StateFree means slot is free.
StateFree State = iota
StateFree State = 0

// StateData means slot contains data.
StateData
StateData State = 1

// StatePointer means slot contains pointer.
StatePointer
StatePointer State = 3
)

// Flags defines pointer flags.
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