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core: solve a remote-import/local-mine data race

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This commit is contained in:
Péter Szilágyi 2016-07-08 16:59:19 +03:00
parent 2b94d7fc7f
commit f5a29eab5c
1 changed files with 3 additions and 4 deletions
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7
core/blockchain.go
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@ -771,14 +771,13 @@ func (self *BlockChain) WriteBlock(block *types.Block) (status WriteStatus, err
if ptd == nil { if ptd == nil {
return NonStatTy, ParentError(block.ParentHash()) return NonStatTy, ParentError(block.ParentHash())
} }
localTd := self.GetTd(self.currentBlock.Hash(), self.currentBlock.NumberU64())
externTd := new(big.Int).Add(block.Difficulty(), ptd)
// Make sure no inconsistent state is leaked during insertion // Make sure no inconsistent state is leaked during insertion
self.mu.Lock() self.mu.Lock()
defer self.mu.Unlock() defer self.mu.Unlock()
localTd := self.GetTd(self.currentBlock.Hash(), self.currentBlock.NumberU64())
externTd := new(big.Int).Add(block.Difficulty(), ptd)
// If the total difficulty is higher than our known, add it to the canonical chain // If the total difficulty is higher than our known, add it to the canonical chain
// Second clause in the if statement reduces the vulnerability to selfish mining. // Second clause in the if statement reduces the vulnerability to selfish mining.
// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf // Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf