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fix bug: should use Lock when mutating the flag (#1141)

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* should use Lock when mutating the flag

* same problem in MVHashMap.Write

* hole the rlock while reading WriteCell

---------

Co-authored-by: zhiqiangxu <652732310@qq.com>
This commit is contained in:
Pratik Patil 2024-01-22 20:47:47 +05:30 committed by GitHub
parent c629c0fdb6
commit c559619c80
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GPG key ID: B5690EEEBB952194
1 changed files with 14 additions and 23 deletions
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29
core/blockstm/mvhashmap.go
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@ -121,34 +121,23 @@ func (mv *MVHashMap) Write(k Key, v Version, data interface{}) {
return
})
cells.rw.RLock()
ci, ok := cells.tm.Get(v.TxnIndex)
cells.rw.RUnlock()
if ok {
if ci.(*WriteCell).incarnation > v.Incarnation {
panic(fmt.Errorf("existing transaction value does not have lower incarnation: %v, %v",
k, v.TxnIndex))
}
ci.(*WriteCell).flag = FlagDone
ci.(*WriteCell).incarnation = v.Incarnation
ci.(*WriteCell).data = data
} else {
cells.rw.Lock()
if ci, ok = cells.tm.Get(v.TxnIndex); !ok {
if ci, ok := cells.tm.Get(v.TxnIndex); !ok {
cells.tm.Put(v.TxnIndex, &WriteCell{
flag: FlagDone,
incarnation: v.Incarnation,
data: data,
})
} else {
if ci.(*WriteCell).incarnation > v.Incarnation {
panic(fmt.Errorf("existing transaction value does not have lower incarnation: %v, %v",
k, v.TxnIndex))
}
ci.(*WriteCell).flag = FlagDone
ci.(*WriteCell).incarnation = v.Incarnation
ci.(*WriteCell).data = data
}
cells.rw.Unlock()
}
}
func (mv *MVHashMap) ReadStorage(k Key, fallBack func() any) any {
@ -166,13 +155,13 @@ func (mv *MVHashMap) MarkEstimate(k Key, txIdx int) {
panic(fmt.Errorf("path must already exist"))
})
cells.rw.RLock()
cells.rw.Lock()
if ci, ok := cells.tm.Get(txIdx); !ok {
panic(fmt.Sprintf("should not happen - cell should be present for path. TxIdx: %v, path, %x, cells keys: %v", txIdx, k, cells.tm.Keys()))
} else {
ci.(*WriteCell).flag = FlagEstimate
}
cells.rw.RUnlock()
cells.rw.Unlock()
}
func (mv *MVHashMap) Delete(k Key, txIdx int) {
@ -233,8 +222,8 @@ func (mv *MVHashMap) Read(k Key, txIdx int) (res MVReadResult) {
}
cells.rw.RLock()
fk, fv := cells.tm.Floor(txIdx - 1)
cells.rw.RUnlock()
if fk != nil && fv != nil {
c := fv.(*WriteCell)
@ -253,6 +242,8 @@ func (mv *MVHashMap) Read(k Key, txIdx int) (res MVReadResult) {
}
}
cells.rw.RUnlock()
return
}